1 /*
   2  * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "cds/classListParser.hpp"
  27 #include "cds/classListWriter.hpp"
  28 #include "cds/dynamicArchive.hpp"
  29 #include "cds/heapShared.hpp"
  30 #include "cds/lambdaFormInvokers.hpp"
  31 #include "classfile/classFileStream.hpp"
  32 #include "classfile/classLoader.inline.hpp"
  33 #include "classfile/classLoaderData.hpp"
  34 #include "classfile/classLoaderData.inline.hpp"
  35 #include "classfile/classLoadInfo.hpp"
  36 #include "classfile/javaAssertions.hpp"
  37 #include "classfile/javaClasses.inline.hpp"
  38 #include "classfile/moduleEntry.hpp"
  39 #include "classfile/modules.hpp"
  40 #include "classfile/packageEntry.hpp"
  41 #include "classfile/stringTable.hpp"
  42 #include "classfile/symbolTable.hpp"
  43 #include "classfile/systemDictionary.hpp"
  44 #include "classfile/vmClasses.hpp"
  45 #include "classfile/vmSymbols.hpp"
  46 #include "gc/shared/collectedHeap.inline.hpp"
  47 #include "interpreter/bytecode.hpp"
  48 #include "interpreter/bytecodeUtils.hpp"
  49 #include "jfr/jfrEvents.hpp"
  50 #include "jvm.h"
  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 = nullptr;
 151   const char * trace = "explicit";
 152   InstanceKlass* caller = nullptr;
 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 = nullptr;
 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 != nullptr &&
 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 != nullptr) {
 210         source_file = s->as_C_string();
 211       }
 212     }
 213   }
 214   if (caller != nullptr) {
 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 != nullptr) {
 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 == nullptr || dst == nullptr) {
 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 != nullptr ? 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 != nullptr) {
 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 != nullptr ? 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   EventShutdown event;
 430   if (event.should_commit()) {
 431     event.set_reason("Shutdown requested from Java");
 432     event.commit();
 433   }
 434 JVM_END
 435 
 436 
 437 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 438   before_exit(thread, true);
 439   vm_exit(code);
 440 JVM_END
 441 
 442 
 443 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 444   if (!DisableExplicitGC) {
 445     EventSystemGC event;
 446     event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
 447     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 448     event.commit();
 449   }
 450 JVM_END
 451 
 452 
 453 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 454   return Universe::heap()->millis_since_last_whole_heap_examined();
 455 JVM_END
 456 
 457 
 458 static inline jlong convert_size_t_to_jlong(size_t val) {
 459   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 460   NOT_LP64 (return (jlong)val;)
 461   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 462 }
 463 
 464 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 465   size_t n = Universe::heap()->capacity();
 466   return convert_size_t_to_jlong(n);
 467 JVM_END
 468 
 469 
 470 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 471   size_t n = Universe::heap()->unused();
 472   return convert_size_t_to_jlong(n);
 473 JVM_END
 474 
 475 
 476 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 477   size_t n = Universe::heap()->max_capacity();
 478   return convert_size_t_to_jlong(n);
 479 JVM_END
 480 
 481 
 482 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 483   return os::active_processor_count();
 484 JVM_END
 485 
 486 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
 487 #ifdef LINUX
 488   if (UseContainerSupport) {
 489     return JNI_TRUE;
 490   }
 491 #endif
 492   return JNI_FALSE;
 493 JVM_END
 494 
 495 // java.lang.Throwable //////////////////////////////////////////////////////
 496 
 497 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 498   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 499   java_lang_Throwable::fill_in_stack_trace(exception);
 500 JVM_END
 501 
 502 // java.lang.NullPointerException ///////////////////////////////////////////
 503 
 504 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
 505   if (!ShowCodeDetailsInExceptionMessages) return nullptr;
 506 
 507   oop exc = JNIHandles::resolve_non_null(throwable);
 508 
 509   Method* method;
 510   int bci;
 511   if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
 512     return nullptr;
 513   }
 514   if (method->is_native()) {
 515     return nullptr;
 516   }
 517 
 518   stringStream ss;
 519   bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
 520   if (ok) {
 521     oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
 522     return (jstring) JNIHandles::make_local(THREAD, result);
 523   } else {
 524     return nullptr;
 525   }
 526 JVM_END
 527 
 528 // java.lang.StackTraceElement //////////////////////////////////////////////
 529 
 530 
 531 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
 532   Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
 533   objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
 534   objArrayHandle stack_trace(THREAD, st);
 535   // Fill in the allocated stack trace
 536   java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
 537 JVM_END
 538 
 539 
 540 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 541   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 542   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 543   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
 544 JVM_END
 545 
 546 
 547 // java.lang.StackWalker //////////////////////////////////////////////////////
 548 
 549 
 550 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
 551                                      jint skip_frames, jobject contScope, jobject cont,
 552                                      jint frame_count, jint start_index, jobjectArray frames))
 553   if (!thread->has_last_Java_frame()) {
 554     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
 555   }
 556 
 557   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 558   Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
 559   Handle cont_h(THREAD, JNIHandles::resolve(cont));
 560   // frames array is a Class<?>[] array when only getting caller reference,
 561   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 562   // be null.
 563   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 564   objArrayHandle frames_array_h(THREAD, fa);
 565 
 566   int limit = start_index + frame_count;
 567   if (frames_array_h->length() < limit) {
 568     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
 569   }
 570 
 571   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
 572                                frame_count, start_index, frames_array_h, CHECK_NULL);
 573   return JNIHandles::make_local(THREAD, result);
 574 JVM_END
 575 
 576 
 577 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
 578                                   jint frame_count, jint start_index,
 579                                   jobjectArray frames))
 580   // frames array is a Class<?>[] array when only getting caller reference,
 581   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 582   // be null.
 583   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 584   objArrayHandle frames_array_h(THREAD, fa);
 585 
 586   int limit = start_index+frame_count;
 587   if (frames_array_h->length() < limit) {
 588     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 589   }
 590 
 591   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 592   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
 593                                   start_index, frames_array_h, THREAD);
 594 JVM_END
 595 
 596 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
 597   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 598   objArrayHandle frames_array_h(THREAD, fa);
 599   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 600   Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
 601 
 602   StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
 603 JVM_END
 604 
 605 // java.lang.Object ///////////////////////////////////////////////
 606 
 607 
 608 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 609   // as implemented in the classic virtual machine; return 0 if object is null
 610   return handle == nullptr ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
 611 JVM_END
 612 
 613 
 614 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 615   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 616   JavaThreadInObjectWaitState jtiows(thread, ms != 0);
 617   if (JvmtiExport::should_post_monitor_wait()) {
 618     JvmtiExport::post_monitor_wait(thread, obj(), ms);
 619 
 620     // The current thread already owns the monitor and it has not yet
 621     // been added to the wait queue so the current thread cannot be
 622     // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
 623     // event handler cannot accidentally consume an unpark() meant for
 624     // the ParkEvent associated with this ObjectMonitor.
 625   }
 626   ObjectSynchronizer::wait(obj, ms, CHECK);
 627 JVM_END
 628 
 629 
 630 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 631   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 632   ObjectSynchronizer::notify(obj, CHECK);
 633 JVM_END
 634 
 635 
 636 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 637   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 638   ObjectSynchronizer::notifyall(obj, CHECK);
 639 JVM_END
 640 
 641 
 642 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 643   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 644   Klass* klass = obj->klass();
 645   JvmtiVMObjectAllocEventCollector oam;
 646 
 647 #ifdef ASSERT
 648   // Just checking that the cloneable flag is set correct
 649   if (obj->is_array()) {
 650     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 651   } else {
 652     guarantee(obj->is_instance(), "should be instanceOop");
 653     bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
 654     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 655   }
 656 #endif
 657 
 658   // Check if class of obj supports the Cloneable interface.
 659   // All arrays are considered to be cloneable (See JLS 20.1.5).
 660   // All j.l.r.Reference classes are considered non-cloneable.
 661   if (!klass->is_cloneable() ||
 662       (klass->is_instance_klass() &&
 663        InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
 664     ResourceMark rm(THREAD);
 665     THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 666   }
 667 
 668   // Make shallow object copy
 669   const size_t size = obj->size();
 670   oop new_obj_oop = nullptr;
 671   if (obj->is_array()) {
 672     const int length = ((arrayOop)obj())->length();
 673     new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
 674                                                    /* do_zero */ true, CHECK_NULL);
 675   } else {
 676     new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
 677   }
 678 
 679   HeapAccess<>::clone(obj(), new_obj_oop, size);
 680 
 681   Handle new_obj(THREAD, new_obj_oop);
 682   // Caution: this involves a java upcall, so the clone should be
 683   // "gc-robust" by this stage.
 684   if (klass->has_finalizer()) {
 685     assert(obj->is_instance(), "should be instanceOop");
 686     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 687     new_obj = Handle(THREAD, new_obj_oop);
 688   }
 689 
 690   return JNIHandles::make_local(THREAD, new_obj());
 691 JVM_END
 692 
 693 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
 694 
 695 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
 696   MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
 697 JVM_END
 698 
 699 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
 700   return InstanceKlass::is_finalization_enabled();
 701 JVM_END
 702 
 703 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
 704 
 705 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
 706   CONT_RegisterNativeMethods(env, cls);
 707 JVM_END
 708 
 709 // java.io.File ///////////////////////////////////////////////////////////////
 710 
 711 JVM_LEAF(char*, JVM_NativePath(char* path))
 712   return os::native_path(path);
 713 JVM_END
 714 
 715 
 716 // Misc. class handling ///////////////////////////////////////////////////////////
 717 
 718 
 719 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
 720   // Getting the class of the caller frame.
 721   //
 722   // The call stack at this point looks something like this:
 723   //
 724   // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
 725   // [1] [ @CallerSensitive API.method                                   ]
 726   // [.] [ (skipped intermediate frames)                                 ]
 727   // [n] [ caller                                                        ]
 728   vframeStream vfst(thread);
 729   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 730   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 731     Method* m = vfst.method();
 732     assert(m != nullptr, "sanity");
 733     switch (n) {
 734     case 0:
 735       // This must only be called from Reflection.getCallerClass
 736       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 737         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 738       }
 739       // fall-through
 740     case 1:
 741       // Frame 0 and 1 must be caller sensitive.
 742       if (!m->caller_sensitive()) {
 743         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 744       }
 745       break;
 746     default:
 747       if (!m->is_ignored_by_security_stack_walk()) {
 748         // We have reached the desired frame; return the holder class.
 749         return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
 750       }
 751       break;
 752     }
 753   }
 754   return nullptr;
 755 JVM_END
 756 
 757 
 758 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 759   oop mirror = nullptr;
 760   BasicType t = name2type(utf);
 761   if (t != T_ILLEGAL && !is_reference_type(t)) {
 762     mirror = Universe::java_mirror(t);
 763   }
 764   if (mirror == nullptr) {
 765     THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 766   } else {
 767     return (jclass) JNIHandles::make_local(THREAD, mirror);
 768   }
 769 JVM_END
 770 
 771 
 772 // Returns a class loaded by the bootstrap class loader; or null
 773 // if not found.  ClassNotFoundException is not thrown.
 774 // FindClassFromBootLoader is exported to the launcher for windows.
 775 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 776                                               const char* name))
 777   // Java libraries should ensure that name is never null or illegal.
 778   if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
 779     // It's impossible to create this class;  the name cannot fit
 780     // into the constant pool.
 781     return nullptr;
 782   }
 783   assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
 784 
 785   TempNewSymbol h_name = SymbolTable::new_symbol(name);
 786   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 787   if (k == nullptr) {
 788     return nullptr;
 789   }
 790 
 791   if (log_is_enabled(Debug, class, resolve)) {
 792     trace_class_resolution(k);
 793   }
 794   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
 795 JVM_END
 796 
 797 // Find a class with this name in this loader, using the caller's protection domain.
 798 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
 799                                           jboolean init, jobject loader,
 800                                           jclass caller))
 801   TempNewSymbol h_name =
 802        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 803                                            CHECK_NULL);
 804 
 805   oop loader_oop = JNIHandles::resolve(loader);
 806   oop from_class = JNIHandles::resolve(caller);
 807   oop protection_domain = nullptr;
 808   // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
 809   // NPE. Put it in another way, the bootstrap class loader has all permission and
 810   // thus no checkPackageAccess equivalence in the VM class loader.
 811   // The caller is also passed as null by the java code if there is no security
 812   // manager to avoid the performance cost of getting the calling class.
 813   if (from_class != nullptr && loader_oop != nullptr) {
 814     protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
 815   }
 816 
 817   Handle h_loader(THREAD, loader_oop);
 818   Handle h_prot(THREAD, protection_domain);
 819   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 820                                                h_prot, false, THREAD);
 821 
 822   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
 823     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 824   }
 825   return result;
 826 JVM_END
 827 
 828 // Currently only called from the old verifier.
 829 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 830                                          jboolean init, jclass from))
 831   TempNewSymbol h_name =
 832        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 833                                            CHECK_NULL);
 834   oop from_class_oop = JNIHandles::resolve(from);
 835   Klass* from_class = (from_class_oop == nullptr)
 836                            ? (Klass*)nullptr
 837                            : java_lang_Class::as_Klass(from_class_oop);
 838   oop class_loader = nullptr;
 839   oop protection_domain = nullptr;
 840   if (from_class != nullptr) {
 841     class_loader = from_class->class_loader();
 842     protection_domain = from_class->protection_domain();
 843   }
 844   Handle h_loader(THREAD, class_loader);
 845   Handle h_prot  (THREAD, protection_domain);
 846   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 847                                                h_prot, true, thread);
 848 
 849   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
 850     // this function is generally only used for class loading during verification.
 851     ResourceMark rm;
 852     oop from_mirror = JNIHandles::resolve_non_null(from);
 853     Klass* from_class = java_lang_Class::as_Klass(from_mirror);
 854     const char * from_name = from_class->external_name();
 855 
 856     oop mirror = JNIHandles::resolve_non_null(result);
 857     Klass* to_class = java_lang_Class::as_Klass(mirror);
 858     const char * to = to_class->external_name();
 859     log_debug(class, resolve)("%s %s (verification)", from_name, to);
 860   }
 861 
 862   return result;
 863 JVM_END
 864 
 865 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
 866 static jclass jvm_define_class_common(const char *name,
 867                                       jobject loader, const jbyte *buf,
 868                                       jsize len, jobject pd, const char *source,
 869                                       TRAPS) {
 870   if (source == nullptr)  source = "__JVM_DefineClass__";
 871 
 872   JavaThread* jt = THREAD;
 873 
 874   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
 875                              ClassLoader::perf_define_appclass_selftime(),
 876                              ClassLoader::perf_define_appclasses(),
 877                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 878                              jt->get_thread_stat()->perf_timers_addr(),
 879                              PerfClassTraceTime::DEFINE_CLASS);
 880 
 881   if (UsePerfData) {
 882     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
 883   }
 884 
 885   // Class resolution will get the class name from the .class stream if the name is null.
 886   TempNewSymbol class_name = name == nullptr ? nullptr :
 887        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
 888                                            CHECK_NULL);
 889 
 890   ResourceMark rm(THREAD);
 891   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
 892   Handle class_loader (THREAD, JNIHandles::resolve(loader));
 893   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
 894   ClassLoadInfo cl_info(protection_domain);
 895   Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
 896                                                    class_loader,
 897                                                    cl_info,
 898                                                    CHECK_NULL);
 899 
 900   if (log_is_enabled(Debug, class, resolve)) {
 901     trace_class_resolution(k);
 902   }
 903 
 904   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
 905 }
 906 
 907 enum {
 908   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
 909   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
 910   STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
 911   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
 912 };
 913 
 914 /*
 915  * Define a class with the specified flags that indicates if it's a nestmate,
 916  * hidden, or strongly referenced from class loader.
 917  */
 918 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
 919                                       const jbyte *buf, jsize len, jobject pd,
 920                                       jboolean init, int flags, jobject classData, TRAPS) {
 921   ResourceMark rm(THREAD);
 922 
 923   Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
 924   // Lookup class must be a non-null instance
 925   if (lookup_k == nullptr) {
 926     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
 927   }
 928   assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
 929 
 930   Handle class_loader (THREAD, lookup_k->class_loader());
 931 
 932   bool is_nestmate = (flags & NESTMATE) == NESTMATE;
 933   bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
 934   bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
 935   bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
 936 
 937   InstanceKlass* host_class = nullptr;
 938   if (is_nestmate) {
 939     host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
 940   }
 941 
 942   log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
 943                              name,
 944                              is_nestmate ? "with dynamic nest-host " : "non-nestmate",
 945                              is_nestmate ? host_class->external_name() : "",
 946                              is_hidden ? "hidden" : "not hidden",
 947                              is_strong ? "strong" : "weak",
 948                              vm_annotations ? "with vm annotations" : "without vm annotation");
 949 
 950   if (!is_hidden) {
 951     // classData is only applicable for hidden classes
 952     if (classData != nullptr) {
 953       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
 954     }
 955     if (is_nestmate) {
 956       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
 957     }
 958     if (!is_strong) {
 959       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
 960     }
 961     if (vm_annotations) {
 962       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
 963     }
 964     if (flags != STRONG_LOADER_LINK) {
 965       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
 966                   err_msg("invalid flag 0x%x", flags));
 967     }
 968   }
 969 
 970   // Class resolution will get the class name from the .class stream if the name is null.
 971   TempNewSymbol class_name = name == nullptr ? nullptr :
 972        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
 973                                            CHECK_NULL);
 974 
 975   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
 976   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
 977   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
 978 
 979   InstanceKlass* ik = nullptr;
 980   if (!is_hidden) {
 981     ClassLoadInfo cl_info(protection_domain);
 982     ik = SystemDictionary::resolve_from_stream(&st, class_name,
 983                                                class_loader,
 984                                                cl_info,
 985                                                CHECK_NULL);
 986 
 987     if (log_is_enabled(Debug, class, resolve)) {
 988       trace_class_resolution(ik);
 989     }
 990   } else { // hidden
 991     Handle classData_h(THREAD, JNIHandles::resolve(classData));
 992     ClassLoadInfo cl_info(protection_domain,
 993                           host_class,
 994                           classData_h,
 995                           is_hidden,
 996                           is_strong,
 997                           vm_annotations);
 998     ik = SystemDictionary::resolve_from_stream(&st, class_name,
 999                                                class_loader,
1000                                                cl_info,
1001                                                CHECK_NULL);
1002 
1003     // The hidden class loader data has been artificially been kept alive to
1004     // this point. The mirror and any instances of this class have to keep
1005     // it alive afterwards.
1006     ik->class_loader_data()->dec_keep_alive();
1007 
1008     if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1009       ModuleEntry* module = ik->module();
1010       const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1011       log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1012                                   module_name,
1013                                   ik->external_name(),
1014                                   host_class->external_name(),
1015                                   ik->is_hidden() ? "is hidden" : "is not hidden");
1016     }
1017   }
1018   assert(Reflection::is_same_class_package(lookup_k, ik),
1019          "lookup class and defined class are in different packages");
1020 
1021   if (init) {
1022     ik->initialize(CHECK_NULL);
1023   } else {
1024     ik->link_class(CHECK_NULL);
1025   }
1026 
1027   return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1028 }
1029 
1030 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1031   return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1032 JVM_END
1033 
1034 /*
1035  * Define a class with the specified lookup class.
1036  *  lookup:  Lookup class
1037  *  name:    the name of the class
1038  *  buf:     class bytes
1039  *  len:     length of class bytes
1040  *  pd:      protection domain
1041  *  init:    initialize the class
1042  *  flags:   properties of the class
1043  *  classData: private static pre-initialized field
1044  */
1045 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1046           jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1047 
1048   if (lookup == nullptr) {
1049     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1050   }
1051 
1052   assert(buf != nullptr, "buf must not be null");
1053 
1054   return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1055 JVM_END
1056 
1057 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1058 
1059   return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1060 JVM_END
1061 
1062 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1063   ResourceMark rm(THREAD);
1064 
1065   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1066   char* str = java_lang_String::as_utf8_string(h_name());
1067 
1068   // Sanity check, don't expect null
1069   if (str == nullptr) return nullptr;
1070 
1071   // Internalize the string, converting '.' to '/' in string.
1072   char* p = (char*)str;
1073   while (*p != '\0') {
1074     if (*p == '.') {
1075       *p = '/';
1076     }
1077     p++;
1078   }
1079 
1080   const int str_len = (int)(p - str);
1081   if (str_len > Symbol::max_length()) {
1082     // It's impossible to create this class;  the name cannot fit
1083     // into the constant pool.
1084     return nullptr;
1085   }
1086   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1087 
1088   // Security Note:
1089   //   The Java level wrapper will perform the necessary security check allowing
1090   //   us to pass the null as the initiating class loader.
1091   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1092   Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1093                                                             h_loader,
1094                                                             Handle());
1095 #if INCLUDE_CDS
1096   if (k == nullptr) {
1097     // If the class is not already loaded, try to see if it's in the shared
1098     // archive for the current classloader (h_loader).
1099     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1100   }
1101 #endif
1102   return (k == nullptr) ? nullptr :
1103             (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1104 JVM_END
1105 
1106 // Module support //////////////////////////////////////////////////////////////////////////////
1107 
1108 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1109                                  jstring location, jobjectArray packages))
1110   Handle h_module (THREAD, JNIHandles::resolve(module));
1111   Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1112 JVM_END
1113 
1114 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1115   Handle h_module (THREAD, JNIHandles::resolve(module));
1116   Modules::set_bootloader_unnamed_module(h_module, CHECK);
1117 JVM_END
1118 
1119 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1120   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1121   Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1122   Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1123 JVM_END
1124 
1125 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1126   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1127   Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1128 JVM_END
1129 
1130 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1131   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1132   Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1133 JVM_END
1134 
1135 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1136   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1137   Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1138   Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1139 JVM_END
1140 
1141 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1142   Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1143   Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1144   Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1145 JVM_END
1146 
1147 // Reflection support //////////////////////////////////////////////////////////////////////////////
1148 
1149 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1150   assert (cls != nullptr, "illegal class");
1151   JvmtiVMObjectAllocEventCollector oam;
1152   ResourceMark rm(THREAD);
1153   HandleMark hm(THREAD);
1154   Handle java_class(THREAD, JNIHandles::resolve(cls));
1155   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1156   return (jstring) JNIHandles::make_local(THREAD, result);
1157 JVM_END
1158 
1159 
1160 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1161   JvmtiVMObjectAllocEventCollector oam;
1162   oop mirror = JNIHandles::resolve_non_null(cls);
1163 
1164   // Special handling for primitive objects
1165   if (java_lang_Class::is_primitive(mirror)) {
1166     // Primitive objects does not have any interfaces
1167     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1168     return (jobjectArray) JNIHandles::make_local(THREAD, r);
1169   }
1170 
1171   Klass* klass = java_lang_Class::as_Klass(mirror);
1172   // Figure size of result array
1173   int size;
1174   if (klass->is_instance_klass()) {
1175     size = InstanceKlass::cast(klass)->local_interfaces()->length();
1176   } else {
1177     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1178     size = 2;
1179   }
1180 
1181   // Allocate result array
1182   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1183   objArrayHandle result (THREAD, r);
1184   // Fill in result
1185   if (klass->is_instance_klass()) {
1186     // Regular instance klass, fill in all local interfaces
1187     for (int index = 0; index < size; index++) {
1188       Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1189       result->obj_at_put(index, k->java_mirror());
1190     }
1191   } else {
1192     // All arrays implement java.lang.Cloneable and java.io.Serializable
1193     result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1194     result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1195   }
1196   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1197 JVM_END
1198 
1199 
1200 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1201   oop mirror = JNIHandles::resolve_non_null(cls);
1202   if (java_lang_Class::is_primitive(mirror)) {
1203     return JNI_FALSE;
1204   }
1205   Klass* k = java_lang_Class::as_Klass(mirror);
1206   jboolean result = k->is_interface();
1207   assert(!result || k->is_instance_klass(),
1208          "all interfaces are instance types");
1209   // The compiler intrinsic for isInterface tests the
1210   // Klass::_access_flags bits in the same way.
1211   return result;
1212 JVM_END
1213 
1214 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1215   oop mirror = JNIHandles::resolve_non_null(cls);
1216   if (java_lang_Class::is_primitive(mirror)) {
1217     return JNI_FALSE;
1218   }
1219   Klass* k = java_lang_Class::as_Klass(mirror);
1220   return k->is_hidden();
1221 JVM_END
1222 
1223 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1224   JvmtiVMObjectAllocEventCollector oam;
1225   oop mirror = JNIHandles::resolve_non_null(cls);
1226   if (java_lang_Class::is_primitive(mirror)) {
1227     // There are no signers for primitive types
1228     return nullptr;
1229   }
1230 
1231   objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1232 
1233   // If there are no signers set in the class, or if the class
1234   // is an array, return null.
1235   if (signers == nullptr) return nullptr;
1236 
1237   // copy of the signers array
1238   Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1239   objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1240   for (int index = 0; index < signers->length(); index++) {
1241     signers_copy->obj_at_put(index, signers->obj_at(index));
1242   }
1243 
1244   // return the copy
1245   return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1246 JVM_END
1247 
1248 
1249 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1250   oop mirror = JNIHandles::resolve_non_null(cls);
1251   if (!java_lang_Class::is_primitive(mirror)) {
1252     // This call is ignored for primitive types and arrays.
1253     // Signers are only set once, ClassLoader.java, and thus shouldn't
1254     // be called with an array.  Only the bootstrap loader creates arrays.
1255     Klass* k = java_lang_Class::as_Klass(mirror);
1256     if (k->is_instance_klass()) {
1257       java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1258     }
1259   }
1260 JVM_END
1261 
1262 
1263 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1264   oop mirror = JNIHandles::resolve_non_null(cls);
1265   if (mirror == nullptr) {
1266     THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1267   }
1268 
1269   if (java_lang_Class::is_primitive(mirror)) {
1270     // Primitive types does not have a protection domain.
1271     return nullptr;
1272   }
1273 
1274   oop pd = java_lang_Class::protection_domain(mirror);
1275   return (jobject) JNIHandles::make_local(THREAD, pd);
1276 JVM_END
1277 
1278 
1279 // Returns the inherited_access_control_context field of the running thread.
1280 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1281   oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1282   return JNIHandles::make_local(THREAD, result);
1283 JVM_END
1284 
1285 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1286   if (!UsePrivilegedStack) return nullptr;
1287 
1288   ResourceMark rm(THREAD);
1289   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1290   JvmtiVMObjectAllocEventCollector oam;
1291 
1292   // count the protection domains on the execution stack. We collapse
1293   // duplicate consecutive protection domains into a single one, as
1294   // well as stopping when we hit a privileged frame.
1295 
1296   oop previous_protection_domain = nullptr;
1297   Handle privileged_context(thread, nullptr);
1298   bool is_privileged = false;
1299   oop protection_domain = nullptr;
1300 
1301   // Iterate through Java frames
1302   vframeStream vfst(thread);
1303   for(; !vfst.at_end(); vfst.next()) {
1304     // get method of frame
1305     Method* method = vfst.method();
1306 
1307     // stop at the first privileged frame
1308     if (method->method_holder() == vmClasses::AccessController_klass() &&
1309       method->name() == vmSymbols::executePrivileged_name())
1310     {
1311       // this frame is privileged
1312       is_privileged = true;
1313 
1314       javaVFrame *priv = vfst.asJavaVFrame();       // executePrivileged
1315 
1316       StackValueCollection* locals = priv->locals();
1317       StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1318       StackValue* clr_sv = locals->at(2); // Class<?> caller
1319       assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1320       assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1321       privileged_context    = ctx_sv->get_obj();
1322       Handle caller         = clr_sv->get_obj();
1323 
1324       Klass *caller_klass = java_lang_Class::as_Klass(caller());
1325       protection_domain  = caller_klass->protection_domain();
1326     } else {
1327       protection_domain = method->method_holder()->protection_domain();
1328     }
1329 
1330     if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1331       local_array->push(Handle(thread, protection_domain));
1332       previous_protection_domain = protection_domain;
1333     }
1334 
1335     if (is_privileged) break;
1336   }
1337 
1338 
1339   // either all the domains on the stack were system domains, or
1340   // we had a privileged system domain
1341   if (local_array->is_empty()) {
1342     if (is_privileged && privileged_context.is_null()) return nullptr;
1343 
1344     oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1345     return JNIHandles::make_local(THREAD, result);
1346   }
1347 
1348   objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1349                                                  local_array->length(), CHECK_NULL);
1350   objArrayHandle h_context(thread, context);
1351   for (int index = 0; index < local_array->length(); index++) {
1352     h_context->obj_at_put(index, local_array->at(index)());
1353   }
1354 
1355   oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1356 
1357   return JNIHandles::make_local(THREAD, result);
1358 JVM_END
1359 
1360 class ScopedValueBindingsResolver {
1361 public:
1362   InstanceKlass* Carrier_klass;
1363   ScopedValueBindingsResolver(JavaThread* THREAD) {
1364     Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_incubator_concurrent_ScopedValue_Carrier(), true, THREAD);
1365     Carrier_klass = InstanceKlass::cast(k);
1366   }
1367 };
1368 
1369 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1370   ResourceMark rm(THREAD);
1371   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1372   JvmtiVMObjectAllocEventCollector oam;
1373 
1374   static ScopedValueBindingsResolver resolver(THREAD);
1375 
1376   // Iterate through Java frames
1377   vframeStream vfst(thread);
1378   for(; !vfst.at_end(); vfst.next()) {
1379     int loc = -1;
1380     // get method of frame
1381     Method* method = vfst.method();
1382 
1383     Symbol *name = method->name();
1384 
1385     InstanceKlass* holder = method->method_holder();
1386     if (name == vmSymbols::runWith_method_name()) {
1387       if ((holder == resolver.Carrier_klass
1388            || holder == vmClasses::VirtualThread_klass()
1389            || holder == vmClasses::Thread_klass())) {
1390         loc = 1;
1391       }
1392     }
1393 
1394     if (loc != -1) {
1395       javaVFrame *frame = vfst.asJavaVFrame();
1396       StackValueCollection* locals = frame->locals();
1397       StackValue* head_sv = locals->at(loc); // jdk/incubator/concurrent/ScopedValue$Snapshot
1398       Handle result = head_sv->get_obj();
1399       assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1400       if (result() != nullptr) {
1401         return JNIHandles::make_local(THREAD, result());
1402       }
1403     }
1404   }
1405 
1406   return nullptr;
1407 JVM_END
1408 
1409 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1410   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1411   return (k != nullptr) && k->is_array_klass() ? true : false;
1412 JVM_END
1413 
1414 
1415 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1416   oop mirror = JNIHandles::resolve_non_null(cls);
1417   return (jboolean) java_lang_Class::is_primitive(mirror);
1418 JVM_END
1419 
1420 
1421 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1422   oop mirror = JNIHandles::resolve_non_null(cls);
1423   if (java_lang_Class::is_primitive(mirror)) {
1424     // Primitive type
1425     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1426   }
1427 
1428   Klass* k = java_lang_Class::as_Klass(mirror);
1429   debug_only(int computed_modifiers = k->compute_modifier_flags());
1430   assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1431   return k->modifier_flags();
1432 JVM_END
1433 
1434 
1435 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1436 
1437 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1438   JvmtiVMObjectAllocEventCollector oam;
1439   // ofClass is a reference to a java_lang_Class object. The mirror object
1440   // of an InstanceKlass
1441   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1442   if (java_lang_Class::is_primitive(ofMirror) ||
1443       ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1444     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1445     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1446   }
1447 
1448   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1449   InnerClassesIterator iter(k);
1450 
1451   if (iter.length() == 0) {
1452     // Neither an inner nor outer class
1453     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1454     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1455   }
1456 
1457   // find inner class info
1458   constantPoolHandle cp(thread, k->constants());
1459   int length = iter.length();
1460 
1461   // Allocate temp. result array
1462   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1463   objArrayHandle result (THREAD, r);
1464   int members = 0;
1465 
1466   for (; !iter.done(); iter.next()) {
1467     int ioff = iter.inner_class_info_index();
1468     int ooff = iter.outer_class_info_index();
1469 
1470     if (ioff != 0 && ooff != 0) {
1471       // Check to see if the name matches the class we're looking for
1472       // before attempting to find the class.
1473       if (cp->klass_name_at_matches(k, ooff)) {
1474         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1475         if (outer_klass == k) {
1476            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1477            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1478 
1479            // Throws an exception if outer klass has not declared k as
1480            // an inner klass
1481            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1482 
1483            result->obj_at_put(members, inner_klass->java_mirror());
1484            members++;
1485         }
1486       }
1487     }
1488   }
1489 
1490   if (members != length) {
1491     // Return array of right length
1492     objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1493     for(int i = 0; i < members; i++) {
1494       res->obj_at_put(i, result->obj_at(i));
1495     }
1496     return (jobjectArray)JNIHandles::make_local(THREAD, res);
1497   }
1498 
1499   return (jobjectArray)JNIHandles::make_local(THREAD, result());
1500 JVM_END
1501 
1502 
1503 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1504 {
1505   // ofClass is a reference to a java_lang_Class object.
1506   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1507   if (java_lang_Class::is_primitive(ofMirror)) {
1508     return nullptr;
1509   }
1510   Klass* klass = java_lang_Class::as_Klass(ofMirror);
1511   if (!klass->is_instance_klass()) {
1512     return nullptr;
1513   }
1514 
1515   bool inner_is_member = false;
1516   Klass* outer_klass
1517     = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1518   if (outer_klass == nullptr)  return nullptr;  // already a top-level class
1519   if (!inner_is_member)  return nullptr;     // a hidden class (inside a method)
1520   return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1521 }
1522 JVM_END
1523 
1524 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1525 {
1526   oop mirror = JNIHandles::resolve_non_null(cls);
1527   if (java_lang_Class::is_primitive(mirror)) {
1528     return nullptr;
1529   }
1530   Klass* klass = java_lang_Class::as_Klass(mirror);
1531   if (!klass->is_instance_klass()) {
1532     return nullptr;
1533   }
1534   InstanceKlass* k = InstanceKlass::cast(klass);
1535   int ooff = 0, noff = 0;
1536   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1537     if (noff != 0) {
1538       constantPoolHandle i_cp(thread, k->constants());
1539       Symbol* name = i_cp->symbol_at(noff);
1540       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1541       return (jstring) JNIHandles::make_local(THREAD, str());
1542     }
1543   }
1544   return nullptr;
1545 }
1546 JVM_END
1547 
1548 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1549   assert (cls != nullptr, "illegal class");
1550   JvmtiVMObjectAllocEventCollector oam;
1551   ResourceMark rm(THREAD);
1552   oop mirror = JNIHandles::resolve_non_null(cls);
1553   // Return null for arrays and primitives
1554   if (!java_lang_Class::is_primitive(mirror)) {
1555     Klass* k = java_lang_Class::as_Klass(mirror);
1556     if (k->is_instance_klass()) {
1557       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1558       if (sym == nullptr) return nullptr;
1559       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1560       return (jstring) JNIHandles::make_local(THREAD, str());
1561     }
1562   }
1563   return nullptr;
1564 JVM_END
1565 
1566 
1567 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1568   assert (cls != nullptr, "illegal class");
1569   oop mirror = JNIHandles::resolve_non_null(cls);
1570   // Return null for arrays and primitives
1571   if (!java_lang_Class::is_primitive(mirror)) {
1572     Klass* k = java_lang_Class::as_Klass(mirror);
1573     if (k->is_instance_klass()) {
1574       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1575       return (jbyteArray) JNIHandles::make_local(THREAD, a);
1576     }
1577   }
1578   return nullptr;
1579 JVM_END
1580 
1581 
1582 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1583   // some of this code was adapted from from jni_FromReflectedField
1584 
1585   oop reflected = JNIHandles::resolve_non_null(field);
1586   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1587   Klass* k    = java_lang_Class::as_Klass(mirror);
1588   int slot      = java_lang_reflect_Field::slot(reflected);
1589   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1590 
1591   InstanceKlass* ik = InstanceKlass::cast(k);
1592   intptr_t offset = ik->field_offset(slot);
1593 
1594   if (modifiers & JVM_ACC_STATIC) {
1595     // for static fields we only look in the current class
1596     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1597       assert(false, "cannot find static field");
1598       return false;
1599     }
1600   } else {
1601     // for instance fields we start with the current class and work
1602     // our way up through the superclass chain
1603     if (!ik->find_field_from_offset(offset, false, &fd)) {
1604       assert(false, "cannot find instance field");
1605       return false;
1606     }
1607   }
1608   return true;
1609 }
1610 
1611 static Method* jvm_get_method_common(jobject method) {
1612   // some of this code was adapted from from jni_FromReflectedMethod
1613 
1614   oop reflected = JNIHandles::resolve_non_null(method);
1615   oop mirror    = nullptr;
1616   int slot      = 0;
1617 
1618   if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1619     mirror = java_lang_reflect_Constructor::clazz(reflected);
1620     slot   = java_lang_reflect_Constructor::slot(reflected);
1621   } else {
1622     assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1623            "wrong type");
1624     mirror = java_lang_reflect_Method::clazz(reflected);
1625     slot   = java_lang_reflect_Method::slot(reflected);
1626   }
1627   Klass* k = java_lang_Class::as_Klass(mirror);
1628 
1629   Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1630   assert(m != nullptr, "cannot find method");
1631   return m;  // caller has to deal with null in product mode
1632 }
1633 
1634 /* Type use annotations support (JDK 1.8) */
1635 
1636 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1637   assert (cls != nullptr, "illegal class");
1638   ResourceMark rm(THREAD);
1639   // Return null for arrays and primitives
1640   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1641     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1642     if (k->is_instance_klass()) {
1643       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1644       if (type_annotations != nullptr) {
1645         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1646         return (jbyteArray) JNIHandles::make_local(THREAD, a);
1647       }
1648     }
1649   }
1650   return nullptr;
1651 JVM_END
1652 
1653 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1654   assert (method != nullptr, "illegal method");
1655   // method is a handle to a java.lang.reflect.Method object
1656   Method* m = jvm_get_method_common(method);
1657   if (m == nullptr) {
1658     return nullptr;
1659   }
1660 
1661   AnnotationArray* type_annotations = m->type_annotations();
1662   if (type_annotations != nullptr) {
1663     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1664     return (jbyteArray) JNIHandles::make_local(THREAD, a);
1665   }
1666 
1667   return nullptr;
1668 JVM_END
1669 
1670 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1671   assert (field != nullptr, "illegal field");
1672   fieldDescriptor fd;
1673   bool gotFd = jvm_get_field_common(field, fd);
1674   if (!gotFd) {
1675     return nullptr;
1676   }
1677 
1678   return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1679 JVM_END
1680 
1681 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1682   if (!cp->is_within_bounds(index)) {
1683     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1684   }
1685 }
1686 
1687 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1688 {
1689   // method is a handle to a java.lang.reflect.Method object
1690   Method* method_ptr = jvm_get_method_common(method);
1691   methodHandle mh (THREAD, method_ptr);
1692   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1693   const int num_params = mh->method_parameters_length();
1694 
1695   if (num_params < 0) {
1696     // A -1 return value from method_parameters_length means there is no
1697     // parameter data.  Return null to indicate this to the reflection
1698     // API.
1699     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1700     return (jobjectArray)nullptr;
1701   } else {
1702     // Otherwise, we return something up to reflection, even if it is
1703     // a zero-length array.  Why?  Because in some cases this can
1704     // trigger a MalformedParametersException.
1705 
1706     // make sure all the symbols are properly formatted
1707     for (int i = 0; i < num_params; i++) {
1708       MethodParametersElement* params = mh->method_parameters_start();
1709       int index = params[i].name_cp_index;
1710       constantPoolHandle cp(THREAD, mh->constants());
1711       bounds_check(cp, index, CHECK_NULL);
1712 
1713       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1714         THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1715                     "Wrong type at constant pool index");
1716       }
1717 
1718     }
1719 
1720     objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1721     objArrayHandle result (THREAD, result_oop);
1722 
1723     for (int i = 0; i < num_params; i++) {
1724       MethodParametersElement* params = mh->method_parameters_start();
1725       // For a 0 index, give a null symbol
1726       Symbol* sym = 0 != params[i].name_cp_index ?
1727         mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1728       int flags = params[i].flags;
1729       oop param = Reflection::new_parameter(reflected_method, i, sym,
1730                                             flags, CHECK_NULL);
1731       result->obj_at_put(i, param);
1732     }
1733     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1734   }
1735 }
1736 JVM_END
1737 
1738 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1739 
1740 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1741 {
1742   JvmtiVMObjectAllocEventCollector oam;
1743 
1744   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1745   // Exclude primitive types and array types
1746   if (java_lang_Class::is_primitive(ofMirror) ||
1747       java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1748     // Return empty array
1749     oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1750     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1751   }
1752 
1753   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1754   constantPoolHandle cp(THREAD, k->constants());
1755 
1756   // Ensure class is linked
1757   k->link_class(CHECK_NULL);
1758 
1759   // Allocate result
1760   int num_fields;
1761 
1762   if (publicOnly) {
1763     num_fields = 0;
1764     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1765       if (fs.access_flags().is_public()) ++num_fields;
1766     }
1767   } else {
1768     num_fields = k->java_fields_count();
1769   }
1770 
1771   objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1772   objArrayHandle result (THREAD, r);
1773 
1774   int out_idx = 0;
1775   fieldDescriptor fd;
1776   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1777     if (!publicOnly || fs.access_flags().is_public()) {
1778       fd.reinitialize(k, fs.index());
1779       oop field = Reflection::new_field(&fd, CHECK_NULL);
1780       result->obj_at_put(out_idx, field);
1781       ++out_idx;
1782     }
1783   }
1784   assert(out_idx == num_fields, "just checking");
1785   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1786 }
1787 JVM_END
1788 
1789 // A class is a record if and only if it is final and a direct subclass of
1790 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1791 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1792 {
1793   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1794   if (k != nullptr && k->is_instance_klass()) {
1795     InstanceKlass* ik = InstanceKlass::cast(k);
1796     return ik->is_record();
1797   } else {
1798     return false;
1799   }
1800 }
1801 JVM_END
1802 
1803 // Returns an array containing the components of the Record attribute,
1804 // or null if the attribute is not present.
1805 //
1806 // Note that this function returns the components of the Record attribute
1807 // even if the class is not a record.
1808 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1809 {
1810   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1811   assert(c->is_instance_klass(), "must be");
1812   InstanceKlass* ik = InstanceKlass::cast(c);
1813 
1814   Array<RecordComponent*>* components = ik->record_components();
1815   if (components != nullptr) {
1816     JvmtiVMObjectAllocEventCollector oam;
1817     constantPoolHandle cp(THREAD, ik->constants());
1818     int length = components->length();
1819     assert(length >= 0, "unexpected record_components length");
1820     objArrayOop record_components =
1821       oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1822     objArrayHandle components_h (THREAD, record_components);
1823 
1824     for (int x = 0; x < length; x++) {
1825       RecordComponent* component = components->at(x);
1826       assert(component != nullptr, "unexpected null record component");
1827       oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1828       components_h->obj_at_put(x, component_oop);
1829     }
1830     return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1831   }
1832 
1833   return nullptr;
1834 }
1835 JVM_END
1836 
1837 static bool select_method(const methodHandle& method, bool want_constructor) {
1838   if (want_constructor) {
1839     return (method->is_initializer() && !method->is_static());
1840   } else {
1841     return  (!method->is_initializer() && !method->is_overpass());
1842   }
1843 }
1844 
1845 static jobjectArray get_class_declared_methods_helper(
1846                                   JNIEnv *env,
1847                                   jclass ofClass, jboolean publicOnly,
1848                                   bool want_constructor,
1849                                   Klass* klass, TRAPS) {
1850 
1851   JvmtiVMObjectAllocEventCollector oam;
1852 
1853   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1854   // Exclude primitive types and array types
1855   if (java_lang_Class::is_primitive(ofMirror)
1856       || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1857     // Return empty array
1858     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1859     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1860   }
1861 
1862   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1863 
1864   // Ensure class is linked
1865   k->link_class(CHECK_NULL);
1866 
1867   Array<Method*>* methods = k->methods();
1868   int methods_length = methods->length();
1869 
1870   // Save original method_idnum in case of redefinition, which can change
1871   // the idnum of obsolete methods.  The new method will have the same idnum
1872   // but if we refresh the methods array, the counts will be wrong.
1873   ResourceMark rm(THREAD);
1874   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1875   int num_methods = 0;
1876 
1877   for (int i = 0; i < methods_length; i++) {
1878     methodHandle method(THREAD, methods->at(i));
1879     if (select_method(method, want_constructor)) {
1880       if (!publicOnly || method->is_public()) {
1881         idnums->push(method->method_idnum());
1882         ++num_methods;
1883       }
1884     }
1885   }
1886 
1887   // Allocate result
1888   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1889   objArrayHandle result (THREAD, r);
1890 
1891   // Now just put the methods that we selected above, but go by their idnum
1892   // in case of redefinition.  The methods can be redefined at any safepoint,
1893   // so above when allocating the oop array and below when creating reflect
1894   // objects.
1895   for (int i = 0; i < num_methods; i++) {
1896     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1897     if (method.is_null()) {
1898       // Method may have been deleted and seems this API can handle null
1899       // Otherwise should probably put a method that throws NSME
1900       result->obj_at_put(i, nullptr);
1901     } else {
1902       oop m;
1903       if (want_constructor) {
1904         m = Reflection::new_constructor(method, CHECK_NULL);
1905       } else {
1906         m = Reflection::new_method(method, false, CHECK_NULL);
1907       }
1908       result->obj_at_put(i, m);
1909     }
1910   }
1911 
1912   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1913 }
1914 
1915 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1916 {
1917   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1918                                            /*want_constructor*/ false,
1919                                            vmClasses::reflect_Method_klass(), THREAD);
1920 }
1921 JVM_END
1922 
1923 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1924 {
1925   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1926                                            /*want_constructor*/ true,
1927                                            vmClasses::reflect_Constructor_klass(), THREAD);
1928 }
1929 JVM_END
1930 
1931 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1932 {
1933   oop mirror = JNIHandles::resolve_non_null(cls);
1934   if (java_lang_Class::is_primitive(mirror)) {
1935     // Primitive type
1936     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1937   }
1938 
1939   Klass* k = java_lang_Class::as_Klass(mirror);
1940   return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1941 }
1942 JVM_END
1943 
1944 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1945 {
1946   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1947   assert(c->is_instance_klass(), "must be");
1948   InstanceKlass* ck = InstanceKlass::cast(c);
1949   Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1950   assert(m->is_instance_klass(), "must be");
1951   InstanceKlass* mk = InstanceKlass::cast(m);
1952   return ck->has_nestmate_access_to(mk, THREAD);
1953 }
1954 JVM_END
1955 
1956 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1957 {
1958   // current is not a primitive or array class
1959   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1960   assert(c->is_instance_klass(), "must be");
1961   InstanceKlass* ck = InstanceKlass::cast(c);
1962   InstanceKlass* host = ck->nest_host(THREAD);
1963   return (jclass) (host == nullptr ? nullptr :
1964                    JNIHandles::make_local(THREAD, host->java_mirror()));
1965 }
1966 JVM_END
1967 
1968 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1969 {
1970   // current is not a primitive or array class
1971   ResourceMark rm(THREAD);
1972   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1973   assert(c->is_instance_klass(), "must be");
1974   InstanceKlass* ck = InstanceKlass::cast(c);
1975   InstanceKlass* host = ck->nest_host(THREAD);
1976 
1977   log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1978                               ck->external_name(), host->external_name());
1979   {
1980     JvmtiVMObjectAllocEventCollector oam;
1981     Array<u2>* members = host->nest_members();
1982     int length = members == nullptr ? 0 : members->length();
1983 
1984     log_trace(class, nestmates)(" - host has %d listed nest members", length);
1985 
1986     // nest host is first in the array so make it one bigger
1987     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1988                                              length + 1, CHECK_NULL);
1989     objArrayHandle result(THREAD, r);
1990     result->obj_at_put(0, host->java_mirror());
1991     if (length != 0) {
1992       int count = 0;
1993       for (int i = 0; i < length; i++) {
1994         int cp_index = members->at(i);
1995         Klass* k = host->constants()->klass_at(cp_index, THREAD);
1996         if (HAS_PENDING_EXCEPTION) {
1997           if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1998             return nullptr; // propagate VMEs
1999           }
2000           if (log_is_enabled(Trace, class, nestmates)) {
2001             stringStream ss;
2002             char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2003             ss.print(" - resolution of nest member %s failed: ", target_member_class);
2004             java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2005             log_trace(class, nestmates)("%s", ss.as_string());
2006           }
2007           CLEAR_PENDING_EXCEPTION;
2008           continue;
2009         }
2010         if (k->is_instance_klass()) {
2011           InstanceKlass* ik = InstanceKlass::cast(k);
2012           InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2013           if (nest_host_k == host) {
2014             result->obj_at_put(count+1, k->java_mirror());
2015             count++;
2016             log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2017           } else {
2018             log_trace(class, nestmates)(" - skipping member %s with different host %s",
2019                                         ik->external_name(), nest_host_k->external_name());
2020           }
2021         } else {
2022           log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2023                                       k->external_name());
2024         }
2025       }
2026       if (count < length) {
2027         // we had invalid entries so we need to compact the array
2028         log_trace(class, nestmates)(" - compacting array from length %d to %d",
2029                                     length + 1, count + 1);
2030 
2031         objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2032                                                   count + 1, CHECK_NULL);
2033         objArrayHandle result2(THREAD, r2);
2034         for (int i = 0; i < count + 1; i++) {
2035           result2->obj_at_put(i, result->obj_at(i));
2036         }
2037         return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2038       }
2039     }
2040     else {
2041       assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2042     }
2043     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2044   }
2045 }
2046 JVM_END
2047 
2048 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2049 {
2050   oop mirror = JNIHandles::resolve_non_null(current);
2051   assert(!java_lang_Class::is_primitive(mirror), "should not be");
2052   Klass* c = java_lang_Class::as_Klass(mirror);
2053   assert(c->is_instance_klass(), "must be");
2054   InstanceKlass* ik = InstanceKlass::cast(c);
2055   ResourceMark rm(THREAD);
2056   log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2057                            ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2058   if (ik->is_sealed()) {
2059     JvmtiVMObjectAllocEventCollector oam;
2060     Array<u2>* subclasses = ik->permitted_subclasses();
2061     int length = subclasses->length();
2062 
2063     log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2064 
2065     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2066                                              length, CHECK_NULL);
2067     objArrayHandle result(THREAD, r);
2068     int count = 0;
2069     for (int i = 0; i < length; i++) {
2070       int cp_index = subclasses->at(i);
2071       Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2072       if (HAS_PENDING_EXCEPTION) {
2073         if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2074           return nullptr; // propagate VMEs
2075         }
2076         if (log_is_enabled(Trace, class, sealed)) {
2077           stringStream ss;
2078           char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2079           ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2080           java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2081           log_trace(class, sealed)("%s", ss.as_string());
2082         }
2083 
2084         CLEAR_PENDING_EXCEPTION;
2085         continue;
2086       }
2087       if (k->is_instance_klass()) {
2088         result->obj_at_put(count++, k->java_mirror());
2089         log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2090       }
2091     }
2092     if (count < length) {
2093       // we had invalid entries so we need to compact the array
2094       objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2095                                                 count, CHECK_NULL);
2096       objArrayHandle result2(THREAD, r2);
2097       for (int i = 0; i < count; i++) {
2098         result2->obj_at_put(i, result->obj_at(i));
2099       }
2100       return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2101     }
2102     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2103   } else {
2104     return nullptr;
2105   }
2106 }
2107 JVM_END
2108 
2109 // Constant pool access //////////////////////////////////////////////////////////
2110 
2111 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2112 {
2113   JvmtiVMObjectAllocEventCollector oam;
2114   oop mirror = JNIHandles::resolve_non_null(cls);
2115   // Return null for primitives and arrays
2116   if (!java_lang_Class::is_primitive(mirror)) {
2117     Klass* k = java_lang_Class::as_Klass(mirror);
2118     if (k->is_instance_klass()) {
2119       InstanceKlass* k_h = InstanceKlass::cast(k);
2120       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2121       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2122       return JNIHandles::make_local(THREAD, jcp());
2123     }
2124   }
2125   return nullptr;
2126 }
2127 JVM_END
2128 
2129 
2130 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2131 {
2132   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2133   return cp->length();
2134 }
2135 JVM_END
2136 
2137 
2138 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2139 {
2140   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141   bounds_check(cp, index, CHECK_NULL);
2142   constantTag tag = cp->tag_at(index);
2143   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2144     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145   }
2146   Klass* k = cp->klass_at(index, CHECK_NULL);
2147   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2148 }
2149 JVM_END
2150 
2151 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2152 {
2153   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154   bounds_check(cp, index, CHECK_NULL);
2155   constantTag tag = cp->tag_at(index);
2156   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2157     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158   }
2159   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2160   if (k == nullptr) return nullptr;
2161   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2162 }
2163 JVM_END
2164 
2165 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2166   constantTag tag = cp->tag_at(index);
2167   if (!tag.is_method() && !tag.is_interface_method()) {
2168     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2169   }
2170   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2171   Klass* k_o;
2172   if (force_resolution) {
2173     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2174   } else {
2175     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2176     if (k_o == nullptr) return nullptr;
2177   }
2178   InstanceKlass* k = InstanceKlass::cast(k_o);
2179   Symbol* name = cp->uncached_name_ref_at(index);
2180   Symbol* sig  = cp->uncached_signature_ref_at(index);
2181   methodHandle m (THREAD, k->find_method(name, sig));
2182   if (m.is_null()) {
2183     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2184   }
2185   oop method;
2186   if (!m->is_initializer() || m->is_static()) {
2187     method = Reflection::new_method(m, true, CHECK_NULL);
2188   } else {
2189     method = Reflection::new_constructor(m, CHECK_NULL);
2190   }
2191   return JNIHandles::make_local(THREAD, method);
2192 }
2193 
2194 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2195 {
2196   JvmtiVMObjectAllocEventCollector oam;
2197   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2198   bounds_check(cp, index, CHECK_NULL);
2199   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2200   return res;
2201 }
2202 JVM_END
2203 
2204 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2205 {
2206   JvmtiVMObjectAllocEventCollector oam;
2207   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2208   bounds_check(cp, index, CHECK_NULL);
2209   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2210   return res;
2211 }
2212 JVM_END
2213 
2214 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2215   constantTag tag = cp->tag_at(index);
2216   if (!tag.is_field()) {
2217     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2218   }
2219   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2220   Klass* k_o;
2221   if (force_resolution) {
2222     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2223   } else {
2224     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2225     if (k_o == nullptr) return nullptr;
2226   }
2227   InstanceKlass* k = InstanceKlass::cast(k_o);
2228   Symbol* name = cp->uncached_name_ref_at(index);
2229   Symbol* sig  = cp->uncached_signature_ref_at(index);
2230   fieldDescriptor fd;
2231   Klass* target_klass = k->find_field(name, sig, &fd);
2232   if (target_klass == nullptr) {
2233     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2234   }
2235   oop field = Reflection::new_field(&fd, CHECK_NULL);
2236   return JNIHandles::make_local(THREAD, field);
2237 }
2238 
2239 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2240 {
2241   JvmtiVMObjectAllocEventCollector oam;
2242   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2243   bounds_check(cp, index, CHECK_NULL);
2244   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2245   return res;
2246 }
2247 JVM_END
2248 
2249 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2250 {
2251   JvmtiVMObjectAllocEventCollector oam;
2252   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2253   bounds_check(cp, index, CHECK_NULL);
2254   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2255   return res;
2256 }
2257 JVM_END
2258 
2259 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2260 {
2261   JvmtiVMObjectAllocEventCollector oam;
2262   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2263   bounds_check(cp, index, CHECK_NULL);
2264   constantTag tag = cp->tag_at(index);
2265   if (!tag.is_field_or_method()) {
2266     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2267   }
2268   int klass_ref = cp->uncached_klass_ref_index_at(index);
2269   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2270   Symbol*  member_name = cp->uncached_name_ref_at(index);
2271   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2272   objArrayOop  dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2273   objArrayHandle dest(THREAD, dest_o);
2274   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2275   dest->obj_at_put(0, str());
2276   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2277   dest->obj_at_put(1, str());
2278   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2279   dest->obj_at_put(2, str());
2280   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2281 }
2282 JVM_END
2283 
2284 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2285 {
2286   JvmtiVMObjectAllocEventCollector oam;
2287   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2288   bounds_check(cp, index, CHECK_0);
2289   constantTag tag = cp->tag_at(index);
2290   if (!tag.is_field_or_method()) {
2291     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2292   }
2293   return (jint) cp->uncached_klass_ref_index_at(index);
2294 }
2295 JVM_END
2296 
2297 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2298 {
2299   JvmtiVMObjectAllocEventCollector oam;
2300   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2301   bounds_check(cp, index, CHECK_0);
2302   constantTag tag = cp->tag_at(index);
2303   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2304     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2305   }
2306   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2307 }
2308 JVM_END
2309 
2310 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2311 {
2312   JvmtiVMObjectAllocEventCollector oam;
2313   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2314   bounds_check(cp, index, CHECK_NULL);
2315   constantTag tag = cp->tag_at(index);
2316   if (!tag.is_name_and_type()) {
2317     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2318   }
2319   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2320   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2321   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2322   objArrayHandle dest(THREAD, dest_o);
2323   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2324   dest->obj_at_put(0, str());
2325   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2326   dest->obj_at_put(1, str());
2327   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2328 }
2329 JVM_END
2330 
2331 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2332 {
2333   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2334   bounds_check(cp, index, CHECK_0);
2335   constantTag tag = cp->tag_at(index);
2336   if (!tag.is_int()) {
2337     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2338   }
2339   return cp->int_at(index);
2340 }
2341 JVM_END
2342 
2343 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2344 {
2345   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2346   bounds_check(cp, index, CHECK_(0L));
2347   constantTag tag = cp->tag_at(index);
2348   if (!tag.is_long()) {
2349     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2350   }
2351   return cp->long_at(index);
2352 }
2353 JVM_END
2354 
2355 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2356 {
2357   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2358   bounds_check(cp, index, CHECK_(0.0f));
2359   constantTag tag = cp->tag_at(index);
2360   if (!tag.is_float()) {
2361     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2362   }
2363   return cp->float_at(index);
2364 }
2365 JVM_END
2366 
2367 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2368 {
2369   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2370   bounds_check(cp, index, CHECK_(0.0));
2371   constantTag tag = cp->tag_at(index);
2372   if (!tag.is_double()) {
2373     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2374   }
2375   return cp->double_at(index);
2376 }
2377 JVM_END
2378 
2379 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2380 {
2381   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2382   bounds_check(cp, index, CHECK_NULL);
2383   constantTag tag = cp->tag_at(index);
2384   if (!tag.is_string()) {
2385     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2386   }
2387   oop str = cp->string_at(index, CHECK_NULL);
2388   return (jstring) JNIHandles::make_local(THREAD, str);
2389 }
2390 JVM_END
2391 
2392 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2393 {
2394   JvmtiVMObjectAllocEventCollector oam;
2395   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2396   bounds_check(cp, index, CHECK_NULL);
2397   constantTag tag = cp->tag_at(index);
2398   if (!tag.is_symbol()) {
2399     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2400   }
2401   Symbol* sym = cp->symbol_at(index);
2402   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2403   return (jstring) JNIHandles::make_local(THREAD, str());
2404 }
2405 JVM_END
2406 
2407 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2408 {
2409   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2410   bounds_check(cp, index, CHECK_0);
2411   constantTag tag = cp->tag_at(index);
2412   jbyte result = tag.value();
2413   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2414   // they are changed to the corresponding tags from the JVM spec, so that java code in
2415   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2416   if (tag.is_klass_or_reference()) {
2417       result = JVM_CONSTANT_Class;
2418   } else if (tag.is_string_index()) {
2419       result = JVM_CONSTANT_String;
2420   } else if (tag.is_method_type_in_error()) {
2421       result = JVM_CONSTANT_MethodType;
2422   } else if (tag.is_method_handle_in_error()) {
2423       result = JVM_CONSTANT_MethodHandle;
2424   } else if (tag.is_dynamic_constant_in_error()) {
2425       result = JVM_CONSTANT_Dynamic;
2426   }
2427   return result;
2428 }
2429 JVM_END
2430 
2431 // Assertion support. //////////////////////////////////////////////////////////
2432 
2433 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2434   assert(cls != nullptr, "bad class");
2435 
2436   oop r = JNIHandles::resolve(cls);
2437   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2438   if (java_lang_Class::is_primitive(r)) return false;
2439 
2440   Klass* k = java_lang_Class::as_Klass(r);
2441   assert(k->is_instance_klass(), "must be an instance klass");
2442   if (!k->is_instance_klass()) return false;
2443 
2444   ResourceMark rm(THREAD);
2445   const char* name = k->name()->as_C_string();
2446   bool system_class = k->class_loader() == nullptr;
2447   return JavaAssertions::enabled(name, system_class);
2448 
2449 JVM_END
2450 
2451 
2452 // Return a new AssertionStatusDirectives object with the fields filled in with
2453 // command-line assertion arguments (i.e., -ea, -da).
2454 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2455   JvmtiVMObjectAllocEventCollector oam;
2456   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2457   return JNIHandles::make_local(THREAD, asd);
2458 JVM_END
2459 
2460 // Verification ////////////////////////////////////////////////////////////////////////////////
2461 
2462 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2463 
2464 // RedefineClasses support: bug 6214132 caused verification to fail.
2465 // All functions from this section should call the jvmtiThreadSate function:
2466 //   Klass* class_to_verify_considering_redefinition(Klass* klass).
2467 // The function returns a Klass* of the _scratch_class if the verifier
2468 // was invoked in the middle of the class redefinition.
2469 // Otherwise it returns its argument value which is the _the_class Klass*.
2470 // Please, refer to the description in the jvmtiThreadSate.hpp.
2471 
2472 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2473   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2474   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2475   return k->name()->as_utf8();
2476 JVM_END
2477 
2478 
2479 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2480   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2481   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2482   // types will have length zero if this is not an InstanceKlass
2483   // (length is determined by call to JVM_GetClassCPEntriesCount)
2484   if (k->is_instance_klass()) {
2485     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2486     for (int index = cp->length() - 1; index >= 0; index--) {
2487       constantTag tag = cp->tag_at(index);
2488       types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2489     }
2490   }
2491 JVM_END
2492 
2493 
2494 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2495   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2496   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2497   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2498 JVM_END
2499 
2500 
2501 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2502   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2503   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2504   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2505 JVM_END
2506 
2507 
2508 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2509   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2510   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2511   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2512 JVM_END
2513 
2514 
2515 // The following methods, used for the verifier, are never called with
2516 // array klasses, so a direct cast to InstanceKlass is safe.
2517 // Typically, these methods are called in a loop with bounds determined
2518 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2519 // zero for arrays.
2520 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2521   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2522   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2523   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2524   int length = method->checked_exceptions_length();
2525   if (length > 0) {
2526     CheckedExceptionElement* table= method->checked_exceptions_start();
2527     for (int i = 0; i < length; i++) {
2528       exceptions[i] = table[i].class_cp_index;
2529     }
2530   }
2531 JVM_END
2532 
2533 
2534 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2535   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2536   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2537   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2538   return method->checked_exceptions_length();
2539 JVM_END
2540 
2541 
2542 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2543   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2546   memcpy(code, method->code_base(), method->code_size());
2547 JVM_END
2548 
2549 
2550 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2551   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2552   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2553   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2554   return method->code_size();
2555 JVM_END
2556 
2557 
2558 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2559   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2562   ExceptionTable extable(method);
2563   entry->start_pc   = extable.start_pc(entry_index);
2564   entry->end_pc     = extable.end_pc(entry_index);
2565   entry->handler_pc = extable.handler_pc(entry_index);
2566   entry->catchType  = extable.catch_type_index(entry_index);
2567 JVM_END
2568 
2569 
2570 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2571   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2572   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2574   return method->exception_table_length();
2575 JVM_END
2576 
2577 
2578 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2579   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2582   return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2583 JVM_END
2584 
2585 
2586 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2587   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2588   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2589   return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2590 JVM_END
2591 
2592 
2593 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2594   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2595   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2596   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2597   return method->max_locals();
2598 JVM_END
2599 
2600 
2601 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2602   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2605   return method->size_of_parameters();
2606 JVM_END
2607 
2608 
2609 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2610   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2611   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2612   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2613   return method->verifier_max_stack();
2614 JVM_END
2615 
2616 
2617 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2618   ResourceMark rm(THREAD);
2619   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2620   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2621   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2622   return method->name() == vmSymbols::object_initializer_name();
2623 JVM_END
2624 
2625 
2626 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2627   ResourceMark rm(THREAD);
2628   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2629   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2630   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2631   return method->is_overpass();
2632 JVM_END
2633 
2634 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2635   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2637   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2638   return method->name()->as_utf8();
2639 JVM_END
2640 
2641 
2642 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2643   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2644   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2645   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2646   return method->signature()->as_utf8();
2647 JVM_END
2648 
2649 /**
2650  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2651  * read entries in the constant pool.  Since the old verifier always
2652  * works on a copy of the code, it will not see any rewriting that
2653  * may possibly occur in the middle of verification.  So it is important
2654  * that nothing it calls tries to use the cpCache instead of the raw
2655  * constant pool, so we must use cp->uncached_x methods when appropriate.
2656  */
2657 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2658   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2659   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2660   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2661   switch (cp->tag_at(cp_index).value()) {
2662     case JVM_CONSTANT_Fieldref:
2663       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2664     default:
2665       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2666   }
2667   ShouldNotReachHere();
2668   return nullptr;
2669 JVM_END
2670 
2671 
2672 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2673   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2674   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2675   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2676   switch (cp->tag_at(cp_index).value()) {
2677     case JVM_CONSTANT_InterfaceMethodref:
2678     case JVM_CONSTANT_Methodref:
2679       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2680     default:
2681       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2682   }
2683   ShouldNotReachHere();
2684   return nullptr;
2685 JVM_END
2686 
2687 
2688 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2689   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2690   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2691   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2692   switch (cp->tag_at(cp_index).value()) {
2693     case JVM_CONSTANT_InterfaceMethodref:
2694     case JVM_CONSTANT_Methodref:
2695       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2696     default:
2697       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2698   }
2699   ShouldNotReachHere();
2700   return nullptr;
2701 JVM_END
2702 
2703 
2704 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(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_Fieldref:
2710       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2711     default:
2712       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2713   }
2714   ShouldNotReachHere();
2715   return nullptr;
2716 JVM_END
2717 
2718 
2719 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2720   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2721   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2722   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2723   Symbol* classname = cp->klass_name_at(cp_index);
2724   return classname->as_utf8();
2725 JVM_END
2726 
2727 
2728 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2729   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2730   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2731   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2732   switch (cp->tag_at(cp_index).value()) {
2733     case JVM_CONSTANT_Fieldref: {
2734       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2735       Symbol* classname = cp->klass_name_at(class_index);
2736       return classname->as_utf8();
2737     }
2738     default:
2739       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2740   }
2741   ShouldNotReachHere();
2742   return nullptr;
2743 JVM_END
2744 
2745 
2746 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2747   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2748   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2749   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2750   switch (cp->tag_at(cp_index).value()) {
2751     case JVM_CONSTANT_Methodref:
2752     case JVM_CONSTANT_InterfaceMethodref: {
2753       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2754       Symbol* classname = cp->klass_name_at(class_index);
2755       return classname->as_utf8();
2756     }
2757     default:
2758       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2759   }
2760   ShouldNotReachHere();
2761   return nullptr;
2762 JVM_END
2763 
2764 
2765 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2766   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2767   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2768   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2769   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2770   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2771   ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2772   switch (cp->tag_at(cp_index).value()) {
2773     case JVM_CONSTANT_Fieldref: {
2774       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2775       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2776       InstanceKlass* ik = InstanceKlass::cast(k_called);
2777       for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2778         if (fs.name() == name && fs.signature() == signature) {
2779           return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2780         }
2781       }
2782       return -1;
2783     }
2784     default:
2785       fatal("JVM_GetCPFieldModifiers: illegal constant");
2786   }
2787   ShouldNotReachHere();
2788   return 0;
2789 JVM_END
2790 
2791 
2792 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2793   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2794   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2795   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2796   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2797   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2798   switch (cp->tag_at(cp_index).value()) {
2799     case JVM_CONSTANT_Methodref:
2800     case JVM_CONSTANT_InterfaceMethodref: {
2801       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2802       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2803       Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2804       int methods_count = methods->length();
2805       for (int i = 0; i < methods_count; i++) {
2806         Method* method = methods->at(i);
2807         if (method->name() == name && method->signature() == signature) {
2808             return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2809         }
2810       }
2811       return -1;
2812     }
2813     default:
2814       fatal("JVM_GetCPMethodModifiers: illegal constant");
2815   }
2816   ShouldNotReachHere();
2817   return 0;
2818 JVM_END
2819 
2820 
2821 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2822 
2823 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2824   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2825 JVM_END
2826 
2827 
2828 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2829   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2830   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2831   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2832   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2833   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2834 JVM_END
2835 
2836 // Printing support //////////////////////////////////////////////////
2837 extern "C" {
2838 
2839 ATTRIBUTE_PRINTF(3, 0)
2840 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2841   // Reject count values that are negative signed values converted to
2842   // unsigned; see bug 4399518, 4417214
2843   if ((intptr_t)count <= 0) return -1;
2844 
2845   int result = os::vsnprintf(str, count, fmt, args);
2846   if (result > 0 && (size_t)result >= count) {
2847     result = -1;
2848   }
2849 
2850   return result;
2851 }
2852 
2853 ATTRIBUTE_PRINTF(3, 4)
2854 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2855   va_list args;
2856   int len;
2857   va_start(args, fmt);
2858   len = jio_vsnprintf(str, count, fmt, args);
2859   va_end(args);
2860   return len;
2861 }
2862 
2863 ATTRIBUTE_PRINTF(2, 3)
2864 int jio_fprintf(FILE* f, const char *fmt, ...) {
2865   int len;
2866   va_list args;
2867   va_start(args, fmt);
2868   len = jio_vfprintf(f, fmt, args);
2869   va_end(args);
2870   return len;
2871 }
2872 
2873 ATTRIBUTE_PRINTF(2, 0)
2874 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2875   if (Arguments::vfprintf_hook() != nullptr) {
2876      return Arguments::vfprintf_hook()(f, fmt, args);
2877   } else {
2878     return vfprintf(f, fmt, args);
2879   }
2880 }
2881 
2882 ATTRIBUTE_PRINTF(1, 2)
2883 JNIEXPORT int jio_printf(const char *fmt, ...) {
2884   int len;
2885   va_list args;
2886   va_start(args, fmt);
2887   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2888   va_end(args);
2889   return len;
2890 }
2891 
2892 // HotSpot specific jio method
2893 void jio_print(const char* s, size_t len) {
2894   // Try to make this function as atomic as possible.
2895   if (Arguments::vfprintf_hook() != nullptr) {
2896     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2897   } else {
2898     // Make an unused local variable to avoid warning from gcc compiler.
2899     ssize_t count = os::write(defaultStream::output_fd(), s, (int)len);
2900   }
2901 }
2902 
2903 } // Extern C
2904 
2905 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2906 
2907 // In most of the JVM thread support functions we need to access the
2908 // thread through a ThreadsListHandle to prevent it from exiting and
2909 // being reclaimed while we try to operate on it. The exceptions to this
2910 // rule are when operating on the current thread, or if the monitor of
2911 // the target java.lang.Thread is locked at the Java level - in both
2912 // cases the target cannot exit.
2913 
2914 static void thread_entry(JavaThread* thread, TRAPS) {
2915   HandleMark hm(THREAD);
2916   Handle obj(THREAD, thread->threadObj());
2917   JavaValue result(T_VOID);
2918   JavaCalls::call_virtual(&result,
2919                           obj,
2920                           vmClasses::Thread_klass(),
2921                           vmSymbols::run_method_name(),
2922                           vmSymbols::void_method_signature(),
2923                           THREAD);
2924 }
2925 
2926 
2927 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2928 #if INCLUDE_CDS
2929   if (DumpSharedSpaces) {
2930     // During java -Xshare:dump, if we allow multiple Java threads to
2931     // execute in parallel, symbols and classes may be loaded in
2932     // random orders which will make the resulting CDS archive
2933     // non-deterministic.
2934     //
2935     // Lucikly, during java -Xshare:dump, it's important to run only
2936     // the code in the main Java thread (which is NOT started here) that
2937     // creates the module graph, etc. It's safe to not start the other
2938     // threads which are launched by class static initializers
2939     // (ReferenceHandler, FinalizerThread and CleanerImpl).
2940     if (log_is_enabled(Info, cds)) {
2941       ResourceMark rm;
2942       oop t = JNIHandles::resolve_non_null(jthread);
2943       log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2944     }
2945     return;
2946   }
2947 #endif
2948   JavaThread *native_thread = nullptr;
2949 
2950   // We cannot hold the Threads_lock when we throw an exception,
2951   // due to rank ordering issues. Example:  we might need to grab the
2952   // Heap_lock while we construct the exception.
2953   bool throw_illegal_thread_state = false;
2954 
2955   // We must release the Threads_lock before we can post a jvmti event
2956   // in Thread::start.
2957   {
2958     // Ensure that the C++ Thread and OSThread structures aren't freed before
2959     // we operate.
2960     MutexLocker mu(Threads_lock);
2961 
2962     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2963     // re-starting an already started thread, so we should usually find
2964     // that the JavaThread is null. However for a JNI attached thread
2965     // there is a small window between the Thread object being created
2966     // (with its JavaThread set) and the update to its threadStatus, so we
2967     // have to check for this
2968     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2969       throw_illegal_thread_state = true;
2970     } else {
2971       jlong size =
2972              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2973       // Allocate the C++ Thread structure and create the native thread.  The
2974       // stack size retrieved from java is 64-bit signed, but the constructor takes
2975       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2976       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2977       //  - Avoid passing negative values which would result in really large stacks.
2978       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2979       size_t sz = size > 0 ? (size_t) size : 0;
2980       native_thread = new JavaThread(&thread_entry, sz);
2981 
2982       // At this point it may be possible that no osthread was created for the
2983       // JavaThread due to lack of memory. Check for this situation and throw
2984       // an exception if necessary. Eventually we may want to change this so
2985       // that we only grab the lock if the thread was created successfully -
2986       // then we can also do this check and throw the exception in the
2987       // JavaThread constructor.
2988       if (native_thread->osthread() != nullptr) {
2989         // Note: the current thread is not being used within "prepare".
2990         native_thread->prepare(jthread);
2991       }
2992     }
2993   }
2994 
2995   if (throw_illegal_thread_state) {
2996     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2997   }
2998 
2999   assert(native_thread != nullptr, "Starting null thread?");
3000 
3001   if (native_thread->osthread() == nullptr) {
3002     ResourceMark rm(thread);
3003     log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3004                             JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3005     // No one should hold a reference to the 'native_thread'.
3006     native_thread->smr_delete();
3007     if (JvmtiExport::should_post_resource_exhausted()) {
3008       JvmtiExport::post_resource_exhausted(
3009         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3010         os::native_thread_creation_failed_msg());
3011     }
3012     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3013               os::native_thread_creation_failed_msg());
3014   }
3015 
3016   JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3017 
3018   Thread::start(native_thread);
3019 
3020 JVM_END
3021 
3022 
3023 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3024   ThreadsListHandle tlh(thread);
3025   oop java_thread = nullptr;
3026   JavaThread* receiver = nullptr;
3027   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3028   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3029 
3030   if (is_alive) {
3031     // jthread refers to a live JavaThread.
3032     Thread::set_priority(receiver, (ThreadPriority)prio);
3033   }
3034   // Implied else: If the JavaThread hasn't started yet, then the
3035   // priority set in the java.lang.Thread object above will be pushed
3036   // down when it does start.
3037 JVM_END
3038 
3039 
3040 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3041   if (os::dont_yield()) return;
3042   HOTSPOT_THREAD_YIELD();
3043   os::naked_yield();
3044 JVM_END
3045 
3046 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3047   if (millis < 0) {
3048     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3049   }
3050 
3051   if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3052     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3053   }
3054 
3055   // Save current thread state and restore it at the end of this block.
3056   // And set new thread state to SLEEPING.
3057   JavaThreadSleepState jtss(thread);
3058 
3059   HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3060 
3061   if (millis == 0) {
3062     os::naked_yield();
3063   } else {
3064     ThreadState old_state = thread->osthread()->get_state();
3065     thread->osthread()->set_state(SLEEPING);
3066     if (!thread->sleep(millis)) { // interrupted
3067       // An asynchronous exception could have been thrown on
3068       // us while we were sleeping. We do not overwrite those.
3069       if (!HAS_PENDING_EXCEPTION) {
3070         HOTSPOT_THREAD_SLEEP_END(1);
3071 
3072         // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3073         // to properly restore the thread state.  That's likely wrong.
3074         THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3075       }
3076     }
3077     thread->osthread()->set_state(old_state);
3078   }
3079   HOTSPOT_THREAD_SLEEP_END(0);
3080 JVM_END
3081 
3082 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3083   oop jthread = thread->threadObj();
3084   assert(jthread != nullptr, "no current carrier thread!");
3085   return JNIHandles::make_local(THREAD, jthread);
3086 JVM_END
3087 
3088 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3089   oop theThread = thread->vthread();
3090   assert(theThread != (oop)nullptr, "no current thread!");
3091   return JNIHandles::make_local(THREAD, theThread);
3092 JVM_END
3093 
3094 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3095                                      jobject theThread))
3096   oop threadObj = JNIHandles::resolve(theThread);
3097   thread->set_vthread(threadObj);
3098   JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3099 JVM_END
3100 
3101 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3102   return ThreadIdentifier::unsafe_offset();
3103 JVM_END
3104 
3105 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3106   ThreadsListHandle tlh(thread);
3107   JavaThread* receiver = nullptr;
3108   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3109   if (is_alive) {
3110     // jthread refers to a live JavaThread.
3111     receiver->interrupt();
3112   }
3113 JVM_END
3114 
3115 // Return true iff the current thread has locked the object passed in
3116 
3117 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3118   if (obj == nullptr) {
3119     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3120   }
3121   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3122   return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3123 JVM_END
3124 
3125 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3126   oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3127   return JNIHandles::make_local(THREAD, trace);
3128 JVM_END
3129 
3130 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3131   VM_PrintThreads op;
3132   VMThread::execute(&op);
3133   if (JvmtiExport::should_post_data_dump()) {
3134     JvmtiExport::post_data_dump();
3135   }
3136 JVM_END
3137 
3138 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3139   // We don't use a ThreadsListHandle here because the current thread
3140   // must be alive.
3141   oop java_thread = JNIHandles::resolve_non_null(jthread);
3142   JavaThread* thr = java_lang_Thread::thread(java_thread);
3143   if (thread == thr && !thr->has_attached_via_jni()) {
3144     // Thread naming is only supported for the current thread and
3145     // we don't set the name of an attached thread to avoid stepping
3146     // on other programs.
3147     ResourceMark rm(thread);
3148     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3149     os::set_native_thread_name(thread_name);
3150   }
3151 JVM_END
3152 
3153 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3154   oop theCache = thread->scopedValueCache();
3155   return JNIHandles::make_local(THREAD, theCache);
3156 JVM_END
3157 
3158 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3159                                        jobject theCache))
3160   arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3161   thread->set_scopedValueCache(objs);
3162 JVM_END
3163 
3164 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3165 
3166 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3167   ResourceMark rm(THREAD);
3168   JvmtiVMObjectAllocEventCollector oam;
3169   vframeStream vfst(thread);
3170 
3171   if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3172     // This must only be called from SecurityManager.getClassContext
3173     Method* m = vfst.method();
3174     if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3175           m->name()          == vmSymbols::getClassContext_name() &&
3176           m->signature()     == vmSymbols::void_class_array_signature())) {
3177       THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3178     }
3179   }
3180 
3181   // Collect method holders
3182   GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3183   for (; !vfst.at_end(); vfst.security_next()) {
3184     Method* m = vfst.method();
3185     // Native frames are not returned
3186     if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3187       Klass* holder = m->method_holder();
3188       assert(holder->is_klass(), "just checking");
3189       klass_array->append(holder);
3190     }
3191   }
3192 
3193   // Create result array of type [Ljava/lang/Class;
3194   objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3195   // Fill in mirrors corresponding to method holders
3196   for (int i = 0; i < klass_array->length(); i++) {
3197     result->obj_at_put(i, klass_array->at(i)->java_mirror());
3198   }
3199 
3200   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3201 JVM_END
3202 
3203 
3204 // java.lang.Package ////////////////////////////////////////////////////////////////
3205 
3206 
3207 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3208   ResourceMark rm(THREAD);
3209   JvmtiVMObjectAllocEventCollector oam;
3210   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3211   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3212 return (jstring) JNIHandles::make_local(THREAD, result);
3213 JVM_END
3214 
3215 
3216 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3217   JvmtiVMObjectAllocEventCollector oam;
3218   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3219   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3220 JVM_END
3221 
3222 
3223 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3224 
3225 
3226 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3227   MonitorLocker ml(Heap_lock);
3228   oop ref = Universe::reference_pending_list();
3229   if (ref != nullptr) {
3230     Universe::clear_reference_pending_list();
3231   }
3232   return JNIHandles::make_local(THREAD, ref);
3233 JVM_END
3234 
3235 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3236   MonitorLocker ml(Heap_lock);
3237   return Universe::has_reference_pending_list();
3238 JVM_END
3239 
3240 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3241   MonitorLocker ml(Heap_lock);
3242   while (!Universe::has_reference_pending_list()) {
3243     ml.wait();
3244   }
3245 JVM_END
3246 
3247 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3248   oop ref_oop = JNIHandles::resolve_non_null(ref);
3249   // PhantomReference has it's own implementation of refersTo().
3250   // See: JVM_PhantomReferenceRefersTo
3251   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3252   oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3253   return referent == JNIHandles::resolve(o);
3254 JVM_END
3255 
3256 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3257   oop ref_oop = JNIHandles::resolve_non_null(ref);
3258   // FinalReference has it's own implementation of clear().
3259   assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3260   if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3261     // If the referent has already been cleared then done.
3262     // However, if the referent is dead but has not yet been cleared by
3263     // concurrent reference processing, it should NOT be cleared here.
3264     // Instead, clearing should be left to the GC.  Clearing it here could
3265     // detectably lose an expected notification, which is impossible with
3266     // STW reference processing.  The clearing in enqueue() doesn't have
3267     // this problem, since the enqueue covers the notification, but it's not
3268     // worth the effort to handle that case specially.
3269     return;
3270   }
3271   java_lang_ref_Reference::clear_referent(ref_oop);
3272 JVM_END
3273 
3274 
3275 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3276 
3277 
3278 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3279   oop ref_oop = JNIHandles::resolve_non_null(ref);
3280   oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3281   return referent == JNIHandles::resolve(o);
3282 JVM_END
3283 
3284 
3285 // ObjectInputStream ///////////////////////////////////////////////////////////////
3286 
3287 // Return the first user-defined class loader up the execution stack, or null
3288 // if only code from the bootstrap or platform class loader is on the stack.
3289 
3290 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3291   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3292     InstanceKlass* ik = vfst.method()->method_holder();
3293     oop loader = ik->class_loader();
3294     if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3295       // Skip reflection related frames
3296       if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3297           !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3298         return JNIHandles::make_local(THREAD, loader);
3299       }
3300     }
3301   }
3302   return nullptr;
3303 JVM_END
3304 
3305 
3306 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3307 
3308 
3309 // resolve array handle and check arguments
3310 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3311   if (arr == nullptr) {
3312     THROW_0(vmSymbols::java_lang_NullPointerException());
3313   }
3314   oop a = JNIHandles::resolve_non_null(arr);
3315   if (!a->is_array()) {
3316     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3317   } else if (type_array_only && !a->is_typeArray()) {
3318     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3319   }
3320   return arrayOop(a);
3321 }
3322 
3323 
3324 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3325   arrayOop a = check_array(env, arr, false, CHECK_0);
3326   return a->length();
3327 JVM_END
3328 
3329 
3330 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3331   JvmtiVMObjectAllocEventCollector oam;
3332   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3333   jvalue value;
3334   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3335   oop box = Reflection::box(&value, type, CHECK_NULL);
3336   return JNIHandles::make_local(THREAD, box);
3337 JVM_END
3338 
3339 
3340 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3341   jvalue value;
3342   value.i = 0; // to initialize value before getting used in CHECK
3343   arrayOop a = check_array(env, arr, true, CHECK_(value));
3344   assert(a->is_typeArray(), "just checking");
3345   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3346   BasicType wide_type = (BasicType) wCode;
3347   if (type != wide_type) {
3348     Reflection::widen(&value, type, wide_type, CHECK_(value));
3349   }
3350   return value;
3351 JVM_END
3352 
3353 
3354 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3355   arrayOop a = check_array(env, arr, false, CHECK);
3356   oop box = JNIHandles::resolve(val);
3357   jvalue value;
3358   value.i = 0; // to initialize value before getting used in CHECK
3359   BasicType value_type;
3360   if (a->is_objArray()) {
3361     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3362     value_type = Reflection::unbox_for_regular_object(box, &value);
3363   } else {
3364     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3365   }
3366   Reflection::array_set(&value, a, index, value_type, CHECK);
3367 JVM_END
3368 
3369 
3370 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3371   arrayOop a = check_array(env, arr, true, CHECK);
3372   assert(a->is_typeArray(), "just checking");
3373   BasicType value_type = (BasicType) vCode;
3374   Reflection::array_set(&v, a, index, value_type, CHECK);
3375 JVM_END
3376 
3377 
3378 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3379   JvmtiVMObjectAllocEventCollector oam;
3380   oop element_mirror = JNIHandles::resolve(eltClass);
3381   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3382   return JNIHandles::make_local(THREAD, result);
3383 JVM_END
3384 
3385 
3386 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3387   JvmtiVMObjectAllocEventCollector oam;
3388   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3389   oop element_mirror = JNIHandles::resolve(eltClass);
3390   assert(dim_array->is_typeArray(), "just checking");
3391   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3392   return JNIHandles::make_local(THREAD, result);
3393 JVM_END
3394 
3395 
3396 // Library support ///////////////////////////////////////////////////////////////////////////
3397 
3398 JVM_LEAF(void*, JVM_LoadZipLibrary())
3399   ClassLoader::load_zip_library_if_needed();
3400   return ClassLoader::zip_library_handle();
3401 JVM_END
3402 
3403 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3404   //%note jvm_ct
3405   char ebuf[1024];
3406   void *load_result;
3407   {
3408     ThreadToNativeFromVM ttnfvm(thread);
3409     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3410   }
3411   if (load_result == nullptr) {
3412     if (throwException) {
3413       char msg[1024];
3414       jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3415       // Since 'ebuf' may contain a string encoded using
3416       // platform encoding scheme, we need to pass
3417       // Exceptions::unsafe_to_utf8 to the new_exception method
3418       // as the last argument. See bug 6367357.
3419       Handle h_exception =
3420         Exceptions::new_exception(thread,
3421                                   vmSymbols::java_lang_UnsatisfiedLinkError(),
3422                                   msg, Exceptions::unsafe_to_utf8);
3423 
3424       THROW_HANDLE_0(h_exception);
3425     } else {
3426       log_info(library)("Failed to load library %s", name);
3427       return load_result;
3428     }
3429   }
3430   log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3431   return load_result;
3432 JVM_END
3433 
3434 
3435 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3436   os::dll_unload(handle);
3437   log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3438 JVM_END
3439 
3440 
3441 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3442   void* find_result = os::dll_lookup(handle, name);
3443   log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3444                     find_result != nullptr ? "Found" : "Failed to find",
3445                     name, p2i(handle));
3446   return find_result;
3447 JVM_END
3448 
3449 
3450 // JNI version ///////////////////////////////////////////////////////////////////////////////
3451 
3452 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3453   return Threads::is_supported_jni_version_including_1_1(version);
3454 JVM_END
3455 
3456 
3457 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3458   return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3459 JVM_END
3460 
3461 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3462   return VMContinuations ? JNI_TRUE : JNI_FALSE;
3463 JVM_END
3464 
3465 // String support ///////////////////////////////////////////////////////////////////////////
3466 
3467 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3468   JvmtiVMObjectAllocEventCollector oam;
3469   if (str == nullptr) return nullptr;
3470   oop string = JNIHandles::resolve_non_null(str);
3471   oop result = StringTable::intern(string, CHECK_NULL);
3472   return (jstring) JNIHandles::make_local(THREAD, result);
3473 JVM_END
3474 
3475 
3476 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3477 
3478 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3479 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3480 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3481 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3482 // nature. JavaThreads will be "in native" when using this API from JDK code.
3483 
3484 
3485 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3486   VM_Exit::block_if_vm_exited();
3487   return new PlatformMutex();
3488 }
3489 
3490 
3491 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3492   VM_Exit::block_if_vm_exited();
3493   delete ((PlatformMutex*) mon);
3494 }
3495 
3496 
3497 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3498   VM_Exit::block_if_vm_exited();
3499   ((PlatformMutex*) mon)->lock();
3500   return 0;
3501 }
3502 
3503 
3504 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3505   VM_Exit::block_if_vm_exited();
3506   ((PlatformMutex*) mon)->unlock();
3507 }
3508 
3509 
3510 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3511 
3512 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3513                                     Handle loader, Handle protection_domain,
3514                                     jboolean throwError, TRAPS) {
3515   // Security Note:
3516   //   The Java level wrapper will perform the necessary security check allowing
3517   //   us to pass the null as the initiating class loader.  The VM is responsible for
3518   //   the checkPackageAccess relative to the initiating class loader via the
3519   //   protection_domain. The protection_domain is passed as null by the java code
3520   //   if there is no security manager in 3-arg Class.forName().
3521   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3522 
3523   // Check if we should initialize the class
3524   if (init && klass->is_instance_klass()) {
3525     klass->initialize(CHECK_NULL);
3526   }
3527   return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3528 }
3529 
3530 
3531 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3532 
3533 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3534   Handle method_handle;
3535   if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3536     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3537     Handle receiver(THREAD, JNIHandles::resolve(obj));
3538     objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3539     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3540     jobject res = JNIHandles::make_local(THREAD, result);
3541     if (JvmtiExport::should_post_vm_object_alloc()) {
3542       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3543       assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3544       if (java_lang_Class::is_primitive(ret_type)) {
3545         // Only for primitive type vm allocates memory for java object.
3546         // See box() method.
3547         JvmtiExport::post_vm_object_alloc(thread, result);
3548       }
3549     }
3550     return res;
3551   } else {
3552     THROW_0(vmSymbols::java_lang_StackOverflowError());
3553   }
3554 JVM_END
3555 
3556 
3557 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3558   oop constructor_mirror = JNIHandles::resolve(c);
3559   objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3560   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3561   jobject res = JNIHandles::make_local(THREAD, result);
3562   if (JvmtiExport::should_post_vm_object_alloc()) {
3563     JvmtiExport::post_vm_object_alloc(thread, result);
3564   }
3565   return res;
3566 JVM_END
3567 
3568 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3569 
3570 JVM_LEAF(jboolean, JVM_SupportsCX8())
3571   return VM_Version::supports_cx8();
3572 JVM_END
3573 
3574 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3575   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3576   assert(k->is_klass(), "just checking");
3577   HeapShared::initialize_from_archived_subgraph(THREAD, k);
3578 JVM_END
3579 
3580 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3581                                               jclass caller,
3582                                               jstring interfaceMethodName,
3583                                               jobject factoryType,
3584                                               jobject interfaceMethodType,
3585                                               jobject implementationMember,
3586                                               jobject dynamicMethodType,
3587                                               jclass lambdaProxyClass))
3588 #if INCLUDE_CDS
3589   if (!Arguments::is_dumping_archive()) {
3590     return;
3591   }
3592 
3593   Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3594   InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3595   if (caller_ik->is_hidden()) {
3596     // Hidden classes not of type lambda proxy classes are currently not being archived.
3597     // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3598     // registered for archiving.
3599     return;
3600   }
3601   Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3602   InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3603   assert(lambda_ik->is_hidden(), "must be a hidden class");
3604   assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3605 
3606   Symbol* interface_method_name = nullptr;
3607   if (interfaceMethodName != nullptr) {
3608     interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3609   }
3610   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3611   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3612 
3613   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3614   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3615 
3616   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3617   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3618   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3619 
3620   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3621   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3622 
3623   SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3624                                                  interface_method_type, m, dynamic_method_type, THREAD);
3625 #endif // INCLUDE_CDS
3626 JVM_END
3627 
3628 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3629                                                         jclass caller,
3630                                                         jstring interfaceMethodName,
3631                                                         jobject factoryType,
3632                                                         jobject interfaceMethodType,
3633                                                         jobject implementationMember,
3634                                                         jobject dynamicMethodType))
3635 #if INCLUDE_CDS
3636 
3637   if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3638       implementationMember == nullptr || dynamicMethodType == nullptr) {
3639     THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3640   }
3641 
3642   Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3643   InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3644   if (!caller_ik->is_shared()) {
3645     // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3646     return nullptr;
3647   }
3648 
3649   Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3650   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3651   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3652 
3653   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3654   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3655 
3656   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3657   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3658   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3659 
3660   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3661   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3662 
3663   InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3664                                                                                    interface_method_type, m, dynamic_method_type);
3665   jclass jcls = nullptr;
3666   if (lambda_ik != nullptr) {
3667     InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3668     jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3669   }
3670   return jcls;
3671 #else
3672   return nullptr;
3673 #endif // INCLUDE_CDS
3674 JVM_END
3675 
3676 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3677   return Arguments::is_dumping_archive();
3678 JVM_END
3679 
3680 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3681   return UseSharedSpaces;
3682 JVM_END
3683 
3684 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3685   if (DumpSharedSpaces) {
3686     const char* release = VM_Version::vm_release();
3687     const char* dbg_level = VM_Version::jdk_debug_level();
3688     const char* version = VM_Version::internal_vm_info_string();
3689     jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3690                          java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3691                          java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3692     seed += (jlong)VM_Version::vm_major_version();
3693     seed += (jlong)VM_Version::vm_minor_version();
3694     seed += (jlong)VM_Version::vm_security_version();
3695     seed += (jlong)VM_Version::vm_patch_version();
3696     if (seed == 0) { // don't let this ever be zero.
3697       seed = 0x87654321;
3698     }
3699     log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3700     return seed;
3701   } else {
3702     return 0;
3703   }
3704 JVM_END
3705 
3706 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3707 #if INCLUDE_CDS
3708   return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3709 #else
3710   return false;
3711 #endif // INCLUDE_CDS
3712 JVM_END
3713 
3714 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3715 #if INCLUDE_CDS
3716   assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces,  "Should be set and open or do dynamic dump");
3717   if (line != nullptr) {
3718     ResourceMark rm(THREAD);
3719     Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3720     char* c_line = java_lang_String::as_utf8_string(h_line());
3721     if (DynamicDumpSharedSpaces) {
3722       // Note: LambdaFormInvokers::append take same format which is not
3723       // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3724       LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3725     }
3726     if (ClassListWriter::is_enabled()) {
3727       ClassListWriter w;
3728       w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3729     }
3730   }
3731 #endif // INCLUDE_CDS
3732 JVM_END
3733 
3734 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3735 #if INCLUDE_CDS
3736   ResourceMark rm(THREAD);
3737   Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3738   char* file_name  = java_lang_String::as_utf8_string(file_handle());
3739   MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3740 #endif // INCLUDE_CDS
3741 JVM_END
3742 
3743 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3744 #if INCLUDE_CDS
3745   ResourceMark rm(THREAD);
3746   Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3747   char* archive_name  = java_lang_String::as_utf8_string(file_handle());
3748   DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3749 #endif // INCLUDE_CDS
3750 JVM_END
3751 
3752 // Returns an array of all live Thread objects (VM internal JavaThreads,
3753 // jvmti agent threads, and JNI attaching threads  are skipped)
3754 // See CR 6404306 regarding JNI attaching threads
3755 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3756   ResourceMark rm(THREAD);
3757   ThreadsListEnumerator tle(THREAD, false, false);
3758   JvmtiVMObjectAllocEventCollector oam;
3759 
3760   int num_threads = tle.num_threads();
3761   objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3762   objArrayHandle threads_ah(THREAD, r);
3763 
3764   for (int i = 0; i < num_threads; i++) {
3765     Handle h = tle.get_threadObj(i);
3766     threads_ah->obj_at_put(i, h());
3767   }
3768 
3769   return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3770 JVM_END
3771 
3772 
3773 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3774 // Return StackTraceElement[][], each element is the stack trace of a thread in
3775 // the corresponding entry in the given threads array
3776 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3777   JvmtiVMObjectAllocEventCollector oam;
3778 
3779   // Check if threads is null
3780   if (threads == nullptr) {
3781     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3782   }
3783 
3784   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3785   objArrayHandle ah(THREAD, a);
3786   int num_threads = ah->length();
3787   // check if threads is non-empty array
3788   if (num_threads == 0) {
3789     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3790   }
3791 
3792   // check if threads is not an array of objects of Thread class
3793   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3794   if (k != vmClasses::Thread_klass()) {
3795     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3796   }
3797 
3798   ResourceMark rm(THREAD);
3799 
3800   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3801   for (int i = 0; i < num_threads; i++) {
3802     oop thread_obj = ah->obj_at(i);
3803     instanceHandle h(THREAD, (instanceOop) thread_obj);
3804     thread_handle_array->append(h);
3805   }
3806 
3807   // The JavaThread references in thread_handle_array are validated
3808   // in VM_ThreadDump::doit().
3809   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3810   return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3811 
3812 JVM_END
3813 
3814 // JVM monitoring and management support
3815 JVM_LEAF(void*, JVM_GetManagement(jint version))
3816   return Management::get_jmm_interface(version);
3817 JVM_END
3818 
3819 // com.sun.tools.attach.VirtualMachine agent properties support
3820 //
3821 // Initialize the agent properties with the properties maintained in the VM
3822 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3823   ResourceMark rm;
3824 
3825   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3826 
3827   PUTPROP(props, "sun.java.command", Arguments::java_command());
3828   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3829   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3830   return properties;
3831 JVM_END
3832 
3833 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3834 {
3835   JvmtiVMObjectAllocEventCollector oam;
3836 
3837   if (ofClass == nullptr) {
3838     return nullptr;
3839   }
3840   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3841   // Special handling for primitive objects
3842   if (java_lang_Class::is_primitive(mirror())) {
3843     return nullptr;
3844   }
3845   Klass* k = java_lang_Class::as_Klass(mirror());
3846   if (!k->is_instance_klass()) {
3847     return nullptr;
3848   }
3849   InstanceKlass* ik = InstanceKlass::cast(k);
3850   int encl_method_class_idx = ik->enclosing_method_class_index();
3851   if (encl_method_class_idx == 0) {
3852     return nullptr;
3853   }
3854   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3855   objArrayHandle dest(THREAD, dest_o);
3856   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3857   dest->obj_at_put(0, enc_k->java_mirror());
3858   int encl_method_method_idx = ik->enclosing_method_method_index();
3859   if (encl_method_method_idx != 0) {
3860     Symbol* sym = ik->constants()->symbol_at(
3861                         extract_low_short_from_int(
3862                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3863     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3864     dest->obj_at_put(1, str());
3865     sym = ik->constants()->symbol_at(
3866               extract_high_short_from_int(
3867                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3868     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3869     dest->obj_at_put(2, str());
3870   }
3871   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3872 }
3873 JVM_END
3874 
3875 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3876 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3877   ResourceMark rm(THREAD);
3878 
3879   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3880     return nullptr;
3881   }
3882 
3883   char** vm_flags = Arguments::jvm_flags_array();
3884   char** vm_args = Arguments::jvm_args_array();
3885   int num_flags = Arguments::num_jvm_flags();
3886   int num_args = Arguments::num_jvm_args();
3887 
3888   InstanceKlass* ik = vmClasses::String_klass();
3889   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3890   objArrayHandle result_h(THREAD, r);
3891 
3892   int index = 0;
3893   for (int j = 0; j < num_flags; j++, index++) {
3894     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3895     result_h->obj_at_put(index, h());
3896   }
3897   for (int i = 0; i < num_args; i++, index++) {
3898     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3899     result_h->obj_at_put(index, h());
3900   }
3901   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3902 JVM_END
3903 
3904 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3905   return os::get_signal_number(name);
3906 JVM_END
3907 
3908 // If notifications are disabled then just update the VTMS transition bit and return.
3909 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3910 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide, jboolean first_mount))
3911 #if INCLUDE_JVMTI
3912   if (!DoJVMTIVirtualThreadTransitions) {
3913     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3914     return;
3915   }
3916   if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3917     thread->set_is_in_VTMS_transition(hide);
3918     oop vt = JNIHandles::resolve_external_guard(vthread);
3919     java_lang_Thread::set_is_in_VTMS_transition(vt, hide);
3920     return;
3921   }
3922   if (hide) {
3923    JvmtiVTMSTransitionDisabler::VTMS_mount_begin(vthread, first_mount);
3924   } else {
3925    JvmtiVTMSTransitionDisabler::VTMS_mount_end(vthread, first_mount);
3926   }
3927 #else
3928   fatal("Should only be called with JVMTI enabled");
3929 #endif
3930 JVM_END
3931 
3932 // If notifications are disabled then just update the VTMS transition bit and return.
3933 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3934 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide, jboolean last_unmount))
3935 #if INCLUDE_JVMTI
3936   if (!DoJVMTIVirtualThreadTransitions) {
3937     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3938     return;
3939   }
3940   if (!JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3941     thread->set_is_in_VTMS_transition(hide);
3942     oop vt = JNIHandles::resolve_external_guard(vthread);
3943     java_lang_Thread::set_is_in_VTMS_transition(vt, hide);
3944     return;
3945   }
3946   if (hide) {
3947    JvmtiVTMSTransitionDisabler::VTMS_unmount_begin(vthread, last_unmount);
3948   } else {
3949    JvmtiVTMSTransitionDisabler::VTMS_unmount_end(vthread, last_unmount);
3950   }
3951 #else
3952   fatal("Should only be called with JVMTI enabled");
3953 #endif
3954 JVM_END
3955 
3956 // Always update the temporary VTMS transition bit.
3957 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
3958 #if INCLUDE_JVMTI
3959   if (!DoJVMTIVirtualThreadTransitions) {
3960     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3961     return;
3962   }
3963   assert(!thread->is_in_VTMS_transition(), "sanity check");
3964   assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
3965   thread->toggle_is_in_tmp_VTMS_transition();
3966 #else
3967   fatal("Should only be called with JVMTI enabled");
3968 #endif
3969 JVM_END
3970 
3971 /*
3972  * Return the current class's class file version.  The low order 16 bits of the
3973  * returned jint contain the class's major version.  The high order 16 bits
3974  * contain the class's minor version.
3975  */
3976 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3977   oop mirror = JNIHandles::resolve_non_null(current);
3978   if (java_lang_Class::is_primitive(mirror)) {
3979     // return latest major version and minor version of 0.
3980     return JVM_CLASSFILE_MAJOR_VERSION;
3981   }
3982   assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
3983 
3984   Klass* c = java_lang_Class::as_Klass(mirror);
3985   assert(c->is_instance_klass(), "must be");
3986   InstanceKlass* ik = InstanceKlass::cast(c);
3987   return (ik->minor_version() << 16) | ik->major_version();
3988 JVM_END
3989 
3990 /*
3991  * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3992  * get the value will see a materialized value and not a scalar-replaced
3993  * null value.
3994  */
3995 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3996   JVM_EnsureMaterializedForStackWalk(env, value);
3997 JVM_END