1 /*
   2  * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "cds/aotClassInitializer.hpp"
  26 #include "cds/aotMetaspace.hpp"
  27 #include "cds/cdsConfig.hpp"
  28 #include "cds/classListParser.hpp"
  29 #include "cds/classListWriter.hpp"
  30 #include "cds/dynamicArchive.hpp"
  31 #include "cds/heapShared.hpp"
  32 #include "cds/lambdaFormInvokers.hpp"
  33 #include "cds/lambdaProxyClassDictionary.hpp"
  34 #include "classfile/classFileStream.hpp"
  35 #include "classfile/classLoader.inline.hpp"
  36 #include "classfile/classLoaderData.inline.hpp"
  37 #include "classfile/classLoadInfo.hpp"
  38 #include "classfile/javaAssertions.hpp"
  39 #include "classfile/javaClasses.inline.hpp"
  40 #include "classfile/moduleEntry.hpp"
  41 #include "classfile/modules.hpp"
  42 #include "classfile/packageEntry.hpp"
  43 #include "classfile/stringTable.hpp"
  44 #include "classfile/symbolTable.hpp"
  45 #include "classfile/systemDictionary.hpp"
  46 #include "classfile/vmClasses.hpp"
  47 #include "classfile/vmSymbols.hpp"
  48 #include "gc/shared/collectedHeap.inline.hpp"
  49 #include "interpreter/bytecode.hpp"
  50 #include "interpreter/bytecodeUtils.hpp"
  51 #include "jfr/jfrEvents.hpp"
  52 #include "jvm.h"
  53 #include "logging/log.hpp"
  54 #include "memory/oopFactory.hpp"
  55 #include "memory/referenceType.hpp"
  56 #include "memory/resourceArea.hpp"
  57 #include "memory/universe.hpp"
  58 #include "oops/access.inline.hpp"
  59 #include "oops/constantPool.hpp"
  60 #include "oops/fieldStreams.inline.hpp"
  61 #include "oops/flatArrayKlass.hpp"
  62 #include "oops/instanceKlass.hpp"
  63 #include "oops/klass.inline.hpp"
  64 #include "oops/method.hpp"
  65 #include "oops/objArrayKlass.hpp"
  66 #include "oops/objArrayOop.inline.hpp"
  67 #include "oops/oop.inline.hpp"
  68 #include "oops/recordComponent.hpp"
  69 #include "oops/refArrayOop.inline.hpp"
  70 #include "prims/foreignGlobals.hpp"
  71 #include "prims/jvm_misc.hpp"
  72 #include "prims/jvmtiExport.hpp"
  73 #include "prims/jvmtiThreadState.inline.hpp"
  74 #include "prims/stackwalk.hpp"
  75 #include "runtime/arguments.hpp"
  76 #include "runtime/atomicAccess.hpp"
  77 #include "runtime/continuation.hpp"
  78 #include "runtime/deoptimization.hpp"
  79 #include "runtime/globals_extension.hpp"
  80 #include "runtime/handles.inline.hpp"
  81 #include "runtime/handshake.hpp"
  82 #include "runtime/init.hpp"
  83 #include "runtime/interfaceSupport.inline.hpp"
  84 #include "runtime/java.hpp"
  85 #include "runtime/javaCalls.hpp"
  86 #include "runtime/javaThread.hpp"
  87 #include "runtime/jfieldIDWorkaround.hpp"
  88 #include "runtime/jniHandles.inline.hpp"
  89 #include "runtime/mountUnmountDisabler.hpp"
  90 #include "runtime/os.inline.hpp"
  91 #include "runtime/osThread.hpp"
  92 #include "runtime/perfData.hpp"
  93 #include "runtime/reflection.hpp"
  94 #include "runtime/synchronizer.hpp"
  95 #include "runtime/threadIdentifier.hpp"
  96 #include "runtime/threadSMR.hpp"
  97 #include "runtime/vframe.inline.hpp"
  98 #include "runtime/vm_version.hpp"
  99 #include "runtime/vmOperations.hpp"
 100 #include "services/attachListener.hpp"
 101 #include "services/management.hpp"
 102 #include "services/threadService.hpp"
 103 #include "utilities/checkedCast.hpp"
 104 #include "utilities/copy.hpp"
 105 #include "utilities/defaultStream.hpp"
 106 #include "utilities/dtrace.hpp"
 107 #include "utilities/events.hpp"
 108 #include "utilities/macros.hpp"
 109 #include "utilities/utf8.hpp"
 110 #include "utilities/zipLibrary.hpp"
 111 #if INCLUDE_CDS
 112 #include "classfile/systemDictionaryShared.hpp"
 113 #endif
 114 #if INCLUDE_JFR
 115 #include "jfr/jfr.hpp"
 116 #endif
 117 #if INCLUDE_MANAGEMENT
 118 #include "services/finalizerService.hpp"
 119 #endif
 120 #ifdef LINUX
 121 #include "osContainer_linux.hpp"
 122 #endif
 123 
 124 #include <errno.h>
 125 
 126 /*
 127   NOTE about use of any ctor or function call that can trigger a safepoint/GC:
 128   such ctors and calls MUST NOT come between an oop declaration/init and its
 129   usage because if objects are move this may cause various memory stomps, bus
 130   errors and segfaults. Here is a cookbook for causing so called "naked oop
 131   failures":
 132 
 133       JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
 134           // Object address to be held directly in mirror & not visible to GC
 135           oop mirror = JNIHandles::resolve_non_null(ofClass);
 136 
 137           // If this ctor can hit a safepoint, moving objects around, then
 138           ComplexConstructor foo;
 139 
 140           // Boom! mirror may point to JUNK instead of the intended object
 141           (some dereference of mirror)
 142 
 143           // Here's another call that may block for GC, making mirror stale
 144           MutexLocker ml(some_lock);
 145 
 146           // And here's an initializer that can result in a stale oop
 147           // all in one step.
 148           oop o = call_that_can_throw_exception(TRAPS);
 149 
 150 
 151   The solution is to keep the oop declaration BELOW the ctor or function
 152   call that might cause a GC, do another resolve to reassign the oop, or
 153   consider use of a Handle instead of an oop so there is immunity from object
 154   motion. But note that the "QUICK" entries below do not have a handlemark
 155   and thus can only support use of handles passed in.
 156 */
 157 
 158 extern void trace_class_resolution(Klass* to_class) {
 159   ResourceMark rm;
 160   int line_number = -1;
 161   const char * source_file = nullptr;
 162   const char * trace = "explicit";
 163   InstanceKlass* caller = nullptr;
 164   JavaThread* jthread = JavaThread::current();
 165   if (jthread->has_last_Java_frame()) {
 166     vframeStream vfst(jthread);
 167 
 168     // Scan up the stack skipping ClassLoader frames.
 169     Method* last_caller = nullptr;
 170 
 171     while (!vfst.at_end()) {
 172       Method* m = vfst.method();
 173       if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
 174         break;
 175       }
 176       last_caller = m;
 177       vfst.next();
 178     }
 179     // if this is called from Class.forName0 and that is called from Class.forName,
 180     // then print the caller of Class.forName.  If this is Class.loadClass, then print
 181     // that caller, otherwise keep quiet since this should be picked up elsewhere.
 182     bool found_it = false;
 183     if (!vfst.at_end() &&
 184         vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 185         vfst.method()->name() == vmSymbols::forName0_name()) {
 186       vfst.next();
 187       if (!vfst.at_end() &&
 188           vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 189           vfst.method()->name() == vmSymbols::forName_name()) {
 190         vfst.next();
 191         found_it = true;
 192       }
 193     } else if (last_caller != nullptr &&
 194                last_caller->method_holder()->name() ==
 195                  vmSymbols::java_lang_ClassLoader() &&
 196                last_caller->name() == vmSymbols::loadClass_name()) {
 197       found_it = true;
 198     } else if (!vfst.at_end()) {
 199       if (vfst.method()->is_native()) {
 200         // JNI call
 201         found_it = true;
 202       }
 203     }
 204     if (found_it && !vfst.at_end()) {
 205       // found the caller
 206       caller = vfst.method()->method_holder();
 207       line_number = vfst.method()->line_number_from_bci(vfst.bci());
 208       if (line_number == -1) {
 209         // show method name if it's a native method
 210         trace = vfst.method()->name_and_sig_as_C_string();
 211       }
 212       Symbol* s = caller->source_file_name();
 213       if (s != nullptr) {
 214         source_file = s->as_C_string();
 215       }
 216     }
 217   }
 218   if (caller != nullptr) {
 219     if (to_class != caller) {
 220       const char * from = caller->external_name();
 221       const char * to = to_class->external_name();
 222       // print in a single call to reduce interleaving between threads
 223       if (source_file != nullptr) {
 224         log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
 225       } else {
 226         log_debug(class, resolve)("%s %s (%s)", from, to, trace);
 227       }
 228     }
 229   }
 230 }
 231 
 232 // java.lang.System //////////////////////////////////////////////////////////////////////
 233 
 234 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env))
 235 #if INCLUDE_CDS
 236   if (CDSConfig::is_dumping_preimage_static_archive()) {
 237     if (!AOTMetaspace::preimage_static_archive_dumped()) {
 238       AOTMetaspace::dump_static_archive(THREAD);
 239       return JNI_TRUE;
 240     }
 241   }
 242   return JNI_FALSE;
 243 #else
 244   return JNI_FALSE;
 245 #endif // INCLUDE_CDS
 246 JVM_END
 247 
 248 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
 249   return os::javaTimeMillis();
 250 JVM_END
 251 
 252 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
 253   return os::javaTimeNanos();
 254 JVM_END
 255 
 256 // The function below is actually exposed by jdk.internal.misc.VM and not
 257 // java.lang.System, but we choose to keep it here so that it stays next
 258 // to JVM_CurrentTimeMillis and JVM_NanoTime
 259 
 260 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); //  2^32
 261 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
 262 
 263 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
 264   jlong seconds;
 265   jlong nanos;
 266 
 267   os::javaTimeSystemUTC(seconds, nanos);
 268 
 269   // We're going to verify that the result can fit in a long.
 270   // For that we need the difference in seconds between 'seconds'
 271   // and 'offset_secs' to be such that:
 272   //     |seconds - offset_secs| < (2^63/10^9)
 273   // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
 274   // which makes |seconds - offset_secs| < 2^33
 275   // and we will prefer +/- 2^32 as the maximum acceptable diff
 276   // as 2^32 has a more natural feel than 2^33...
 277   //
 278   // So if |seconds - offset_secs| >= 2^32 - we return a special
 279   // sentinel value (-1) which the caller should take as an
 280   // exception value indicating that the offset given to us is
 281   // too far from range of the current time - leading to too big
 282   // a nano adjustment. The caller is expected to recover by
 283   // computing a more accurate offset and calling this method
 284   // again. (For the record 2^32 secs is ~136 years, so that
 285   // should rarely happen)
 286   //
 287   jlong diff = seconds - offset_secs;
 288   if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
 289      return -1; // sentinel value: the offset is too far off the target
 290   }
 291 
 292   // return the adjustment. If you compute a time by adding
 293   // this number of nanoseconds along with the number of seconds
 294   // in the offset you should get the current UTC time.
 295   return (diff * (jlong)1000000000) + nanos;
 296 JVM_END
 297 
 298 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
 299                                jobject dst, jint dst_pos, jint length))
 300   // Check if we have null pointers
 301   if (src == nullptr || dst == nullptr) {
 302     THROW(vmSymbols::java_lang_NullPointerException());
 303   }
 304   arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
 305   arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
 306   assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
 307   assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
 308   // Do copy
 309   s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
 310 JVM_END
 311 
 312 
 313 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
 314   JavaValue r(T_OBJECT);
 315   // public synchronized Object put(Object key, Object value);
 316   HandleMark hm(THREAD);
 317   Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK);
 318   Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
 319   JavaCalls::call_virtual(&r,
 320                           props,
 321                           vmClasses::Properties_klass(),
 322                           vmSymbols::put_name(),
 323                           vmSymbols::object_object_object_signature(),
 324                           key_str,
 325                           value_str,
 326                           THREAD);
 327 }
 328 
 329 
 330 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
 331 
 332 /*
 333  * Return all of the system properties in a Java String array with alternating
 334  * names and values from the jvm SystemProperty.
 335  * Which includes some internal and all commandline -D defined properties.
 336  */
 337 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
 338   ResourceMark rm(THREAD);
 339   HandleMark hm(THREAD);
 340   int ndx = 0;
 341   int fixedCount = 2;
 342 
 343   SystemProperty* p = Arguments::system_properties();
 344   int count = Arguments::PropertyList_count(p);
 345 
 346   // Allocate result String array
 347   InstanceKlass* ik = vmClasses::String_klass();
 348   objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
 349   objArrayHandle result_h(THREAD, r);
 350 
 351   while (p != nullptr) {
 352     const char * key = p->key();
 353     if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
 354         const char * value = p->value();
 355         Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
 356         Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
 357         result_h->obj_at_put(ndx * 2,  key_str());
 358         result_h->obj_at_put(ndx * 2 + 1, value_str());
 359         ndx++;
 360     }
 361     p = p->next();
 362   }
 363 
 364   // Convert the -XX:MaxDirectMemorySize= command line flag
 365   // to the sun.nio.MaxDirectMemorySize property.
 366   // Do this after setting user properties to prevent people
 367   // from setting the value with a -D option, as requested.
 368   // Leave empty if not supplied
 369   if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
 370     char as_chars[256];
 371     jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
 372     Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
 373     Handle value_str  = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
 374     result_h->obj_at_put(ndx * 2,  key_str());
 375     result_h->obj_at_put(ndx * 2 + 1, value_str());
 376     ndx++;
 377   }
 378 
 379   // JVM monitoring and management support
 380   // Add the sun.management.compiler property for the compiler's name
 381   {
 382 #undef CSIZE
 383 #if defined(_LP64)
 384   #define CSIZE "64-Bit "
 385 #else
 386   #define CSIZE
 387 #endif // 64bit
 388 
 389 #if COMPILER1_AND_COMPILER2
 390     const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
 391 #else
 392 #if defined(COMPILER1)
 393     const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
 394 #elif defined(COMPILER2)
 395     const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
 396 #elif INCLUDE_JVMCI
 397     #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
 398 #else
 399     const char* compiler_name = "";
 400 #endif // compilers
 401 #endif // COMPILER1_AND_COMPILER2
 402 
 403     if (*compiler_name != '\0' &&
 404         (Arguments::mode() != Arguments::_int)) {
 405       Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
 406       Handle value_str  = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
 407       result_h->obj_at_put(ndx * 2,  key_str());
 408       result_h->obj_at_put(ndx * 2 + 1, value_str());
 409       ndx++;
 410     }
 411   }
 412 
 413   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
 414 JVM_END
 415 
 416 
 417 /*
 418  * Return the temporary directory that the VM uses for the attach
 419  * and perf data files.
 420  *
 421  * It is important that this directory is well-known and the
 422  * same for all VM instances. It cannot be affected by configuration
 423  * variables such as java.io.tmpdir.
 424  */
 425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 426   HandleMark hm(THREAD);
 427   const char* temp_dir = os::get_temp_directory();
 428   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 429   return (jstring) JNIHandles::make_local(THREAD, h());
 430 JVM_END
 431 
 432 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
 433   if (len < 0) {
 434     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
 435   }
 436   elmClass->initialize(CHECK);
 437   if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
 438     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
 439   }
 440   if (elmClass->is_abstract()) {
 441     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
 442   }
 443 }
 444 
 445 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
 446   oop o = JNIHandles::resolve_non_null(orig);
 447   assert(o->is_array(), "Must be");
 448   oop array = nullptr;
 449   arrayOop org = (arrayOop)o;
 450   arrayHandle oh(THREAD, org);
 451   ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
 452   InlineKlass* vk = InlineKlass::cast(ak->element_klass());
 453   int len = to - from;  // length of the new array
 454   if (ak->is_null_free_array_klass()) {
 455     if ((len != 0) && (from >= org->length() || to > org->length())) {
 456       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
 457     }
 458   }
 459   if (org->is_flatArray()) {
 460     FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
 461     LayoutKind lk = fak->layout_kind();
 462     ArrayKlass::ArrayProperties props = ArrayKlass::array_properties_from_layout(lk);
 463     array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
 464     arrayHandle ah(THREAD, (arrayOop)array);
 465     int end = to < oh()->length() ? to : oh()->length();
 466     for (int i = from; i < end; i++) {
 467       void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
 468       void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
 469       vk->copy_payload_to_addr(src, dst, lk, false);
 470     }
 471     array = ah();
 472   } else {
 473     ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
 474     array = oopFactory::new_objArray(vk, len, props,  CHECK_NULL);
 475     int end = to < oh()->length() ? to : oh()->length();
 476     for (int i = from; i < end; i++) {
 477       if (i < ((objArrayOop)oh())->length()) {
 478         ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
 479       } else {
 480         assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
 481         ((objArrayOop)array)->obj_at_put(i - from, nullptr);
 482       }
 483     }
 484   }
 485   return (jarray) JNIHandles::make_local(THREAD, array);
 486 JVM_END
 487 
 488 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
 489   oop mirror = JNIHandles::resolve_non_null(elmClass);
 490   oop init = JNIHandles::resolve(initVal);
 491   if (init == nullptr) {
 492     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
 493   }
 494   Handle init_h(THREAD, init);
 495   Klass* klass = java_lang_Class::as_Klass(mirror);
 496   if (klass != init_h()->klass()) {
 497     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
 498   }
 499   validate_array_arguments(klass, len, CHECK_NULL);
 500   InlineKlass* vk = InlineKlass::cast(klass);
 501   ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
 502   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 503   for (int i = 0; i < len; i++) {
 504     array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
 505   }
 506   return (jarray) JNIHandles::make_local(THREAD, array);
 507 JVM_END
 508 
 509 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
 510   oop mirror = JNIHandles::resolve_non_null(elmClass);
 511   oop init = JNIHandles::resolve(initVal);
 512   if (init == nullptr) {
 513     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
 514   }
 515   Handle init_h(THREAD, init);
 516   Klass* klass = java_lang_Class::as_Klass(mirror);
 517   if (klass != init_h()->klass()) {
 518     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
 519   }
 520   validate_array_arguments(klass, len, CHECK_NULL);
 521   InlineKlass* vk = InlineKlass::cast(klass);
 522   ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
 523   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 524   for (int i = 0; i < len; i++) {
 525     array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
 526   }
 527   return (jarray) JNIHandles::make_local(THREAD, array);
 528 JVM_END
 529 
 530 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
 531   oop mirror = JNIHandles::resolve_non_null(elmClass);
 532   Klass* klass = java_lang_Class::as_Klass(mirror);
 533   klass->initialize(CHECK_NULL);
 534   validate_array_arguments(klass, len, CHECK_NULL);
 535   InlineKlass* vk = InlineKlass::cast(klass);
 536   ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
 537   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 538   return (jarray) JNIHandles::make_local(THREAD, array);
 539 JVM_END
 540 
 541 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
 542   arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
 543   return oop->is_flatArray();
 544 JVM_END
 545 
 546 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
 547   arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
 548   return oop->is_null_free_array();
 549 JVM_END
 550 
 551 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
 552   // There are multiple cases where an array can/must support atomic access:
 553   //   - the array is a reference array
 554   //   - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT
 555   //   - the array is flat and its component type is naturally atomic
 556   arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
 557   if (oop->is_refArray()) return true;
 558   if (oop->is_flatArray()) {
 559     FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
 560     if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) return true;
 561     if (fak->element_klass()->is_naturally_atomic()) return true;
 562   }
 563   return false;
 564 JVM_END
 565 
 566 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 567 
 568 extern volatile jint vm_created;
 569 
 570 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
 571   EventShutdown event;
 572   if (event.should_commit()) {
 573     event.set_reason("Shutdown requested from Java");
 574     event.commit();
 575   }
 576 JVM_END
 577 
 578 
 579 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 580   before_exit(thread, true);
 581   vm_exit(code);
 582 JVM_END
 583 
 584 
 585 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 586   if (!DisableExplicitGC) {
 587     EventSystemGC event;
 588     event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
 589     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 590     event.commit();
 591   }
 592 JVM_END
 593 
 594 
 595 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 596   return Universe::heap()->millis_since_last_whole_heap_examined();
 597 JVM_END
 598 
 599 
 600 static inline jlong convert_size_t_to_jlong(size_t val) {
 601   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 602   NOT_LP64 (return (jlong)val;)
 603   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 604 }
 605 
 606 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 607   size_t n = Universe::heap()->capacity();
 608   return convert_size_t_to_jlong(n);
 609 JVM_END
 610 
 611 
 612 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 613   size_t n = Universe::heap()->unused();
 614   return convert_size_t_to_jlong(n);
 615 JVM_END
 616 
 617 
 618 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 619   size_t n = Universe::heap()->max_capacity();
 620   return convert_size_t_to_jlong(n);
 621 JVM_END
 622 
 623 
 624 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 625   return os::active_processor_count();
 626 JVM_END
 627 
 628 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
 629 #ifdef LINUX
 630   if (UseContainerSupport) {
 631     return JNI_TRUE;
 632   }
 633 #endif
 634   return JNI_FALSE;
 635 JVM_END
 636 
 637 JVM_LEAF(jboolean, JVM_IsContainerized(void))
 638 #ifdef LINUX
 639   if (OSContainer::is_containerized()) {
 640     return JNI_TRUE;
 641   }
 642 #endif
 643   return JNI_FALSE;
 644 JVM_END
 645 
 646 // java.lang.Throwable //////////////////////////////////////////////////////
 647 
 648 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 649   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 650   java_lang_Throwable::fill_in_stack_trace(exception);
 651 JVM_END
 652 
 653 // java.lang.NullPointerException ///////////////////////////////////////////
 654 
 655 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
 656   if (!ShowCodeDetailsInExceptionMessages) return nullptr;
 657 
 658   oop exc = JNIHandles::resolve_non_null(throwable);
 659 
 660   Method* method;
 661   int bci;
 662   if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
 663     return nullptr;
 664   }
 665   if (method->is_native()) {
 666     return nullptr;
 667   }
 668 
 669   stringStream ss;
 670   bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
 671   if (ok) {
 672     oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
 673     return (jstring) JNIHandles::make_local(THREAD, result);
 674   } else {
 675     return nullptr;
 676   }
 677 JVM_END
 678 
 679 // java.lang.StackTraceElement //////////////////////////////////////////////
 680 
 681 
 682 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
 683   Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
 684   objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
 685   objArrayHandle stack_trace(THREAD, st);
 686   // Fill in the allocated stack trace
 687   java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
 688 JVM_END
 689 
 690 
 691 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 692   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 693   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 694   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
 695 JVM_END
 696 
 697 
 698 // java.lang.StackWalker //////////////////////////////////////////////////////
 699 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
 700   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
 701 
 702   bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
 703   bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
 704   Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
 705   if (!have_name) {
 706     oop name = StringTable::intern(method->name(), CHECK);
 707     java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
 708   }
 709   if (!have_type) {
 710     Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
 711     java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
 712   }
 713 JVM_END
 714 
 715 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
 716                                      jint skip_frames, jobject contScope, jobject cont,
 717                                      jint buffer_size, jint start_index, jobjectArray frames))
 718   if (!thread->has_last_Java_frame()) {
 719     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
 720   }
 721 
 722   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 723   Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
 724   Handle cont_h(THREAD, JNIHandles::resolve(cont));
 725   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 726   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 727   // be null.
 728   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 729   objArrayHandle frames_array_h(THREAD, fa);
 730 
 731   if (frames_array_h->length() < buffer_size) {
 732     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
 733   }
 734 
 735   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
 736                                buffer_size, start_index, frames_array_h, CHECK_NULL);
 737   return JNIHandles::make_local(THREAD, result);
 738 JVM_END
 739 
 740 
 741 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
 742                                   jint last_batch_count, jint buffer_size, jint start_index,
 743                                   jobjectArray frames))
 744   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 745   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 746   // be null.
 747   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 748   objArrayHandle frames_array_h(THREAD, fa);
 749 
 750   if (frames_array_h->length() < buffer_size) {
 751     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 752   }
 753 
 754   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 755   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
 756                                   start_index, frames_array_h, THREAD);
 757 JVM_END
 758 
 759 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
 760   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 761   objArrayHandle frames_array_h(THREAD, fa);
 762   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 763   Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
 764 
 765   StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
 766 JVM_END
 767 
 768 // java.lang.Object ///////////////////////////////////////////////
 769 
 770 
 771 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 772   // as implemented in the classic virtual machine; return 0 if object is null
 773   if (handle == nullptr) {
 774     return 0;
 775   }
 776   oop obj = JNIHandles::resolve_non_null(handle);
 777   if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) {
 778       JavaValue result(T_INT);
 779       JavaCallArguments args;
 780       Handle ho(THREAD, obj);
 781       args.push_oop(ho);
 782       methodHandle method(THREAD, UseAltSubstitutabilityMethod
 783               ? Universe::value_object_hash_codeAlt_method() : Universe::value_object_hash_code_method());
 784       JavaCalls::call(&result, method, &args, THREAD);
 785       if (HAS_PENDING_EXCEPTION) {
 786         if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
 787           Handle e(THREAD, PENDING_EXCEPTION);
 788           CLEAR_PENDING_EXCEPTION;
 789           THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
 790         }
 791       }
 792       return result.get_jint();
 793   } else {
 794     return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
 795   }
 796 JVM_END
 797 
 798 
 799 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 800   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 801   ObjectSynchronizer::wait(obj, ms, CHECK);
 802 JVM_END
 803 
 804 
 805 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 806   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 807   ObjectSynchronizer::notify(obj, CHECK);
 808 JVM_END
 809 
 810 
 811 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 812   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 813   ObjectSynchronizer::notifyall(obj, CHECK);
 814 JVM_END
 815 
 816 
 817 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 818   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 819   Klass* klass = obj->klass();
 820   JvmtiVMObjectAllocEventCollector oam;
 821 
 822 #ifdef ASSERT
 823   // Just checking that the cloneable flag is set correct
 824   if (obj->is_array()) {
 825     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 826   } else {
 827     guarantee(obj->is_instance(), "should be instanceOop");
 828     bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
 829     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 830   }
 831 #endif
 832 
 833   // Check if class of obj supports the Cloneable interface.
 834   // All arrays are considered to be cloneable (See JLS 20.1.5).
 835   // All j.l.r.Reference classes are considered non-cloneable.
 836   if (!klass->is_cloneable() ||
 837       (klass->is_instance_klass() &&
 838        InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
 839     ResourceMark rm(THREAD);
 840     THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 841   }
 842 
 843   if (klass->is_inline_klass()) {
 844     // Value instances have no identity, so return the current instance instead of allocating a new one
 845     // Value classes cannot have finalizers, so the method can return immediately
 846     return JNIHandles::make_local(THREAD, obj());
 847   }
 848 
 849   // Make shallow object copy
 850   const size_t size = obj->size();
 851   oop new_obj_oop = nullptr;
 852   if (obj->is_array()) {
 853     const int length = ((arrayOop)obj())->length();
 854     new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
 855                                                    /* do_zero */ true, CHECK_NULL);
 856   } else {
 857     new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
 858   }
 859 
 860   HeapAccess<>::clone(obj(), new_obj_oop, size);
 861 
 862   Handle new_obj(THREAD, new_obj_oop);
 863   // Caution: this involves a java upcall, so the clone should be
 864   // "gc-robust" by this stage.
 865   if (klass->has_finalizer()) {
 866     assert(obj->is_instance(), "should be instanceOop");
 867     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 868     new_obj = Handle(THREAD, new_obj_oop);
 869   }
 870 
 871   return JNIHandles::make_local(THREAD, new_obj());
 872 JVM_END
 873 
 874 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
 875 
 876 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
 877   MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
 878 JVM_END
 879 
 880 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
 881   return InstanceKlass::is_finalization_enabled();
 882 JVM_END
 883 
 884 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
 885 
 886 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
 887   CONT_RegisterNativeMethods(env, cls);
 888 JVM_END
 889 
 890 // java.io.File ///////////////////////////////////////////////////////////////
 891 
 892 JVM_LEAF(char*, JVM_NativePath(char* path))
 893   return os::native_path(path);
 894 JVM_END
 895 
 896 
 897 // Misc. class handling ///////////////////////////////////////////////////////////
 898 
 899 
 900 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
 901   // Getting the class of the caller frame.
 902   //
 903   // The call stack at this point looks something like this:
 904   //
 905   // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
 906   // [1] [ @CallerSensitive API.method                                   ]
 907   // [.] [ (skipped intermediate frames)                                 ]
 908   // [n] [ caller                                                        ]
 909   vframeStream vfst(thread);
 910   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 911   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 912     Method* m = vfst.method();
 913     assert(m != nullptr, "sanity");
 914     switch (n) {
 915     case 0:
 916       // This must only be called from Reflection.getCallerClass
 917       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 918         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 919       }
 920       // fall-through
 921     case 1:
 922       // Frame 0 and 1 must be caller sensitive.
 923       if (!m->caller_sensitive()) {
 924         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 925       }
 926       break;
 927     default:
 928       if (!m->is_ignored_by_security_stack_walk()) {
 929         // We have reached the desired frame; return the holder class.
 930         return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
 931       }
 932       break;
 933     }
 934   }
 935   return nullptr;
 936 JVM_END
 937 
 938 
 939 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 940   oop mirror = nullptr;
 941   BasicType t = name2type(utf);
 942   if (t != T_ILLEGAL && !is_reference_type(t)) {
 943     mirror = Universe::java_mirror(t);
 944   }
 945   if (mirror == nullptr) {
 946     THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 947   } else {
 948     return (jclass) JNIHandles::make_local(THREAD, mirror);
 949   }
 950 JVM_END
 951 
 952 
 953 // Returns a class loaded by the bootstrap class loader; or null
 954 // if not found.  ClassNotFoundException is not thrown.
 955 // FindClassFromBootLoader is exported to the launcher for windows.
 956 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 957                                               const char* name))
 958   // Java libraries should ensure that name is never null or illegal.
 959   if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
 960     // It's impossible to create this class;  the name cannot fit
 961     // into the constant pool.
 962     return nullptr;
 963   }
 964   assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
 965 
 966   TempNewSymbol h_name = SymbolTable::new_symbol(name);
 967   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 968   if (k == nullptr) {
 969     return nullptr;
 970   }
 971 
 972   if (log_is_enabled(Debug, class, resolve)) {
 973     trace_class_resolution(k);
 974   }
 975   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
 976 JVM_END
 977 
 978 // Find a class with this name in this loader.
 979 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
 980                                           jboolean init, jobject loader))
 981   TempNewSymbol h_name =
 982        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 983                                            CHECK_NULL);
 984 
 985   oop loader_oop = JNIHandles::resolve(loader);
 986   Handle h_loader(THREAD, loader_oop);
 987 
 988   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 989                                                false, THREAD);
 990 
 991   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
 992     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 993   }
 994   return result;
 995 JVM_END
 996 
 997 // Currently only called from the old verifier.
 998 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 999                                          jboolean init, jclass from))
1000   TempNewSymbol h_name =
1001        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1002                                            CHECK_NULL);
1003   oop from_class_oop = JNIHandles::resolve(from);
1004   assert(from_class_oop != nullptr, "must be");
1005   Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1006   assert(from_class != nullptr, "must be");
1007   oop class_loader = from_class->class_loader();
1008 
1009   Handle h_loader(THREAD, class_loader);
1010   jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1011 
1012   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1013     // this function is generally only used for class loading during verification.
1014     ResourceMark rm;
1015     const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1016     const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1017     log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1018   }
1019 
1020 #if INCLUDE_CDS
1021   if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1022     InstanceKlass* ik = InstanceKlass::cast(from_class);
1023     SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1024   }
1025 #endif
1026 
1027   return result;
1028 JVM_END
1029 
1030 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1031 static jclass jvm_define_class_common(const char *name,
1032                                       jobject loader, const jbyte *buf,
1033                                       jsize len, jobject pd, const char *source,
1034                                       TRAPS) {
1035   if (source == nullptr)  source = "__JVM_DefineClass__";
1036 
1037   JavaThread* jt = THREAD;
1038 
1039   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1040                              ClassLoader::perf_define_appclass_selftime(),
1041                              ClassLoader::perf_define_appclasses(),
1042                              jt->get_thread_stat()->perf_recursion_counts_addr(),
1043                              jt->get_thread_stat()->perf_timers_addr(),
1044                              PerfClassTraceTime::DEFINE_CLASS);
1045 
1046   if (UsePerfData) {
1047     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1048   }
1049 
1050   // Class resolution will get the class name from the .class stream if the name is null.
1051   TempNewSymbol class_name = name == nullptr ? nullptr :
1052        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1053                                            CHECK_NULL);
1054 
1055   ResourceMark rm(THREAD);
1056   ClassFileStream st((u1*)buf, len, source);
1057   Handle class_loader (THREAD, JNIHandles::resolve(loader));
1058   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1059   ClassLoadInfo cl_info(protection_domain);
1060   Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1061                                                    class_loader,
1062                                                    cl_info,
1063                                                    CHECK_NULL);
1064 
1065   if (log_is_enabled(Debug, class, resolve)) {
1066     trace_class_resolution(k);
1067   }
1068 
1069   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1070 }
1071 
1072 enum {
1073   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1074   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1075   STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1076   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1077 };
1078 
1079 /*
1080  * Define a class with the specified flags that indicates if it's a nestmate,
1081  * hidden, or strongly referenced from class loader.
1082  */
1083 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1084                                       const jbyte *buf, jsize len, jobject pd,
1085                                       jboolean init, int flags, jobject classData, TRAPS) {
1086   ResourceMark rm(THREAD);
1087 
1088   InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1089   // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1090   if (lookup_k == nullptr) {
1091     // The error message is wrong. We come here only if lookup is a primitive class
1092     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1093   }
1094 
1095   Handle class_loader (THREAD, lookup_k->class_loader());
1096 
1097   bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1098   bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1099   bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1100   bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1101 
1102   InstanceKlass* host_class = nullptr;
1103   if (is_nestmate) {
1104     host_class = lookup_k->nest_host(CHECK_NULL);
1105   }
1106 
1107   log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1108                              name,
1109                              is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1110                              is_nestmate ? host_class->external_name() : "",
1111                              is_hidden ? "hidden" : "not hidden",
1112                              is_strong ? "strong" : "weak",
1113                              vm_annotations ? "with vm annotations" : "without vm annotation");
1114 
1115   if (!is_hidden) {
1116     // classData is only applicable for hidden classes
1117     if (classData != nullptr) {
1118       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1119     }
1120     if (is_nestmate) {
1121       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1122     }
1123     if (!is_strong) {
1124       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1125     }
1126     if (vm_annotations) {
1127       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1128     }
1129     if (flags != STRONG_LOADER_LINK) {
1130       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1131                      err_msg("invalid flag 0x%x", flags));
1132     }
1133   }
1134 
1135   // Class resolution will get the class name from the .class stream if the name is null.
1136   TempNewSymbol class_name = name == nullptr ? nullptr :
1137        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1138                                            CHECK_NULL);
1139 
1140   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1141   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1142   ClassFileStream st((u1*)buf, len, source);
1143 
1144   InstanceKlass* ik = nullptr;
1145   if (!is_hidden) {
1146     ClassLoadInfo cl_info(protection_domain);
1147     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1148                                                class_loader,
1149                                                cl_info,
1150                                                CHECK_NULL);
1151 
1152     if (log_is_enabled(Debug, class, resolve)) {
1153       trace_class_resolution(ik);
1154     }
1155   } else { // hidden
1156     Handle classData_h(THREAD, JNIHandles::resolve(classData));
1157     ClassLoadInfo cl_info(protection_domain,
1158                           host_class,
1159                           classData_h,
1160                           is_hidden,
1161                           is_strong,
1162                           vm_annotations);
1163     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1164                                                class_loader,
1165                                                cl_info,
1166                                                CHECK_NULL);
1167 
1168     // The hidden class loader data has been artificially been kept alive to
1169     // this point. The mirror and any instances of this class have to keep
1170     // it alive afterwards.
1171     ik->class_loader_data()->dec_keep_alive_ref_count();
1172 
1173     if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1174       ModuleEntry* module = ik->module();
1175       const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1176       log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1177                                   module_name,
1178                                   ik->external_name(),
1179                                   host_class->external_name(),
1180                                   ik->is_hidden() ? "is hidden" : "is not hidden");
1181     }
1182   }
1183 
1184   if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1185     // non-hidden class or nestmate class must be in the same package as the Lookup class
1186     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1187   }
1188 
1189   if (init) {
1190     ik->initialize(CHECK_NULL);
1191   } else {
1192     ik->link_class(CHECK_NULL);
1193   }
1194 
1195   return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1196 }
1197 
1198 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1199   return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1200 JVM_END
1201 
1202 /*
1203  * Define a class with the specified lookup class.
1204  *  lookup:  Lookup class
1205  *  name:    the name of the class
1206  *  buf:     class bytes
1207  *  len:     length of class bytes
1208  *  pd:      protection domain
1209  *  init:    initialize the class
1210  *  flags:   properties of the class
1211  *  classData: private static pre-initialized field
1212  */
1213 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1214           jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1215 
1216   if (lookup == nullptr) {
1217     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1218   }
1219 
1220   assert(buf != nullptr, "buf must not be null");
1221 
1222   return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1223 JVM_END
1224 
1225 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1226 
1227   return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1228 JVM_END
1229 
1230 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1231   ResourceMark rm(THREAD);
1232 
1233   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1234   char* str = java_lang_String::as_utf8_string(h_name());
1235 
1236   // Sanity check, don't expect null
1237   if (str == nullptr) return nullptr;
1238 
1239   // Internalize the string, converting '.' to '/' in string.
1240   char* p = (char*)str;
1241   while (*p != '\0') {
1242     if (*p == '.') {
1243       *p = '/';
1244     }
1245     p++;
1246   }
1247 
1248   const int str_len = (int)(p - str);
1249   if (str_len > Symbol::max_length()) {
1250     // It's impossible to create this class;  the name cannot fit
1251     // into the constant pool.
1252     return nullptr;
1253   }
1254   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1255 
1256   // Security Note:
1257   //   The Java level wrapper will perform the necessary security check allowing
1258   //   us to pass the null as the initiating class loader.
1259   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1260   Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1261 #if INCLUDE_CDS
1262   if (k == nullptr) {
1263     // If the class is not already loaded, try to see if it's in the shared
1264     // archive for the current classloader (h_loader).
1265     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1266   }
1267 #endif
1268   return (k == nullptr) ? nullptr :
1269             (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1270 JVM_END
1271 
1272 // Module support //////////////////////////////////////////////////////////////////////////////
1273 
1274 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1275                                  jstring location, jobjectArray packages))
1276   Handle h_module (THREAD, JNIHandles::resolve(module));
1277   Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1278 JVM_END
1279 
1280 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1281   Handle h_module (THREAD, JNIHandles::resolve(module));
1282   Modules::set_bootloader_unnamed_module(h_module, CHECK);
1283 JVM_END
1284 
1285 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1286   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1287   Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1288   Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1289 JVM_END
1290 
1291 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1292   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1293   Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1294 JVM_END
1295 
1296 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1297   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1298   Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1299 JVM_END
1300 
1301 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1302   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1303   Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1304   Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1305 JVM_END
1306 
1307 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1308   Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1309   Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1310   Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1311 JVM_END
1312 
1313 // Reflection support //////////////////////////////////////////////////////////////////////////////
1314 
1315 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1316   assert (cls != nullptr, "illegal class");
1317   JvmtiVMObjectAllocEventCollector oam;
1318   ResourceMark rm(THREAD);
1319   HandleMark hm(THREAD);
1320   Handle java_class(THREAD, JNIHandles::resolve(cls));
1321   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1322   return (jstring) JNIHandles::make_local(THREAD, result);
1323 JVM_END
1324 
1325 
1326 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1327   JvmtiVMObjectAllocEventCollector oam;
1328   oop mirror = JNIHandles::resolve_non_null(cls);
1329 
1330   // Special handling for primitive objects
1331   if (java_lang_Class::is_primitive(mirror)) {
1332     // Primitive objects does not have any interfaces
1333     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1334     return (jobjectArray) JNIHandles::make_local(THREAD, r);
1335   }
1336 
1337   Klass* klass = java_lang_Class::as_Klass(mirror);
1338   // Figure size of result array
1339   int size;
1340   if (klass->is_instance_klass()) {
1341     InstanceKlass* ik = InstanceKlass::cast(klass);
1342     size = ik->local_interfaces()->length();
1343   } else {
1344     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1345     size = 2;
1346   }
1347 
1348   // Allocate result array
1349   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1350   objArrayHandle result (THREAD, r);
1351   // Fill in result
1352   if (klass->is_instance_klass()) {
1353     // Regular instance klass, fill in all local interfaces
1354     for (int index = 0; index < size; index++) {
1355       InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1356       result->obj_at_put(index, k->java_mirror());
1357     }
1358   } else {
1359     // All arrays implement java.lang.Cloneable and java.io.Serializable
1360     result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1361     result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1362   }
1363   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1364 JVM_END
1365 
1366 
1367 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1368   oop mirror = JNIHandles::resolve_non_null(cls);
1369   if (java_lang_Class::is_primitive(mirror)) {
1370     return JNI_FALSE;
1371   }
1372   Klass* k = java_lang_Class::as_Klass(mirror);
1373   return k->is_hidden();
1374 JVM_END
1375 
1376 
1377 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1378   ResourceMark rm(THREAD);
1379   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1380   JvmtiVMObjectAllocEventCollector oam;
1381 
1382   // Iterate through Java frames
1383   vframeStream vfst(thread);
1384   for(; !vfst.at_end(); vfst.next()) {
1385     int loc = -1;
1386     // get method of frame
1387     Method* method = vfst.method();
1388 
1389     Symbol *name = method->name();
1390 
1391     InstanceKlass* holder = method->method_holder();
1392     if (name == vmSymbols::runWith_method_name()) {
1393       if (holder == vmClasses::Thread_klass()
1394           || holder == vmClasses::ScopedValue_Carrier_klass()) {
1395         loc = 1;
1396       }
1397     }
1398 
1399     if (loc != -1) {
1400       javaVFrame *frame = vfst.asJavaVFrame();
1401       StackValueCollection* locals = frame->locals();
1402       StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1403       Handle result = head_sv->get_obj();
1404       assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1405       if (result() != nullptr) {
1406         return JNIHandles::make_local(THREAD, result());
1407       }
1408     }
1409   }
1410 
1411   return nullptr;
1412 JVM_END
1413 
1414 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1415   JvmtiVMObjectAllocEventCollector oam;
1416   // ofClass is a reference to a java_lang_Class object. The mirror object
1417   // of an InstanceKlass
1418   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1419   if (java_lang_Class::is_primitive(ofMirror) ||
1420       ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1421     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1422     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1423   }
1424 
1425   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1426   InnerClassesIterator iter(k);
1427 
1428   if (iter.length() == 0) {
1429     // Neither an inner nor outer class
1430     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1431     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1432   }
1433 
1434   // find inner class info
1435   constantPoolHandle cp(thread, k->constants());
1436   int length = iter.length();
1437 
1438   // Allocate temp. result array
1439   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1440   objArrayHandle result (THREAD, r);
1441   int members = 0;
1442 
1443   for (; !iter.done(); iter.next()) {
1444     int ioff = iter.inner_class_info_index();
1445     int ooff = iter.outer_class_info_index();
1446 
1447     if (ioff != 0 && ooff != 0) {
1448       // Check to see if the name matches the class we're looking for
1449       // before attempting to find the class.
1450       if (cp->klass_name_at_matches(k, ooff)) {
1451         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1452         if (outer_klass == k) {
1453            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1454            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1455 
1456            // Throws an exception if outer klass has not declared k as
1457            // an inner klass
1458            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1459 
1460            result->obj_at_put(members, inner_klass->java_mirror());
1461            members++;
1462         }
1463       }
1464     }
1465   }
1466 
1467   if (members != length) {
1468     // Return array of right length
1469     objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1470     for(int i = 0; i < members; i++) {
1471       res->obj_at_put(i, result->obj_at(i));
1472     }
1473     return (jobjectArray)JNIHandles::make_local(THREAD, res);
1474   }
1475 
1476   return (jobjectArray)JNIHandles::make_local(THREAD, result());
1477 JVM_END
1478 
1479 
1480 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1481 {
1482   // ofClass is a reference to a java_lang_Class object.
1483   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1484   if (java_lang_Class::is_primitive(ofMirror)) {
1485     return nullptr;
1486   }
1487   Klass* klass = java_lang_Class::as_Klass(ofMirror);
1488   if (!klass->is_instance_klass()) {
1489     return nullptr;
1490   }
1491 
1492   bool inner_is_member = false;
1493   Klass* outer_klass
1494     = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1495   if (outer_klass == nullptr)  return nullptr;  // already a top-level class
1496   if (!inner_is_member)  return nullptr;     // a hidden class (inside a method)
1497   return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1498 }
1499 JVM_END
1500 
1501 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1502 {
1503   oop mirror = JNIHandles::resolve_non_null(cls);
1504   if (java_lang_Class::is_primitive(mirror)) {
1505     return nullptr;
1506   }
1507   Klass* klass = java_lang_Class::as_Klass(mirror);
1508   if (!klass->is_instance_klass()) {
1509     return nullptr;
1510   }
1511   InstanceKlass* k = InstanceKlass::cast(klass);
1512   int ooff = 0, noff = 0;
1513   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1514     if (noff != 0) {
1515       constantPoolHandle i_cp(thread, k->constants());
1516       Symbol* name = i_cp->symbol_at(noff);
1517       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1518       return (jstring) JNIHandles::make_local(THREAD, str());
1519     }
1520   }
1521   return nullptr;
1522 }
1523 JVM_END
1524 
1525 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1526   assert (cls != nullptr, "illegal class");
1527   JvmtiVMObjectAllocEventCollector oam;
1528   ResourceMark rm(THREAD);
1529   oop mirror = JNIHandles::resolve_non_null(cls);
1530   // Return null for arrays and primitives
1531   if (!java_lang_Class::is_primitive(mirror)) {
1532     Klass* k = java_lang_Class::as_Klass(mirror);
1533     if (k->is_instance_klass()) {
1534       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1535       if (sym == nullptr) return nullptr;
1536       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1537       return (jstring) JNIHandles::make_local(THREAD, str());
1538     }
1539   }
1540   return nullptr;
1541 JVM_END
1542 
1543 
1544 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1545   assert (cls != nullptr, "illegal class");
1546   oop mirror = JNIHandles::resolve_non_null(cls);
1547   // Return null for arrays and primitives
1548   if (!java_lang_Class::is_primitive(mirror)) {
1549     Klass* k = java_lang_Class::as_Klass(mirror);
1550     if (k->is_instance_klass()) {
1551       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1552       return (jbyteArray) JNIHandles::make_local(THREAD, a);
1553     }
1554   }
1555   return nullptr;
1556 JVM_END
1557 
1558 
1559 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1560   // some of this code was adapted from from jni_FromReflectedField
1561 
1562   oop reflected = JNIHandles::resolve_non_null(field);
1563   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1564   int slot      = java_lang_reflect_Field::slot(reflected);
1565   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1566 
1567   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1568   int offset = ik->field_offset(slot);
1569 
1570   if (modifiers & JVM_ACC_STATIC) {
1571     // for static fields we only look in the current class
1572     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1573       assert(false, "cannot find static field");
1574       return false;
1575     }
1576   } else {
1577     // for instance fields we start with the current class and work
1578     // our way up through the superclass chain
1579     if (!ik->find_field_from_offset(offset, false, &fd)) {
1580       assert(false, "cannot find instance field");
1581       return false;
1582     }
1583   }
1584   return true;
1585 }
1586 
1587 static Method* jvm_get_method_common(jobject method) {
1588   // some of this code was adapted from from jni_FromReflectedMethod
1589 
1590   oop reflected = JNIHandles::resolve_non_null(method);
1591   oop mirror    = nullptr;
1592   int slot      = 0;
1593 
1594   if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1595     mirror = java_lang_reflect_Constructor::clazz(reflected);
1596     slot   = java_lang_reflect_Constructor::slot(reflected);
1597   } else {
1598     assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1599            "wrong type");
1600     mirror = java_lang_reflect_Method::clazz(reflected);
1601     slot   = java_lang_reflect_Method::slot(reflected);
1602   }
1603   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1604 
1605   Method* m = ik->method_with_idnum(slot);
1606   assert(m != nullptr, "cannot find method");
1607   return m;  // caller has to deal with null in product mode
1608 }
1609 
1610 /* Type use annotations support (JDK 1.8) */
1611 
1612 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1613   assert (cls != nullptr, "illegal class");
1614   ResourceMark rm(THREAD);
1615   // Return null for arrays and primitives
1616   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1617     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1618     if (k->is_instance_klass()) {
1619       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1620       if (type_annotations != nullptr) {
1621         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1622         return (jbyteArray) JNIHandles::make_local(THREAD, a);
1623       }
1624     }
1625   }
1626   return nullptr;
1627 JVM_END
1628 
1629 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1630   assert (method != nullptr, "illegal method");
1631   // method is a handle to a java.lang.reflect.Method object
1632   Method* m = jvm_get_method_common(method);
1633   if (m == nullptr) {
1634     return nullptr;
1635   }
1636 
1637   AnnotationArray* type_annotations = m->type_annotations();
1638   if (type_annotations != nullptr) {
1639     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1640     return (jbyteArray) JNIHandles::make_local(THREAD, a);
1641   }
1642 
1643   return nullptr;
1644 JVM_END
1645 
1646 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1647   assert (field != nullptr, "illegal field");
1648   fieldDescriptor fd;
1649   bool gotFd = jvm_get_field_common(field, fd);
1650   if (!gotFd) {
1651     return nullptr;
1652   }
1653 
1654   return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1655 JVM_END
1656 
1657 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1658   if (!cp->is_within_bounds(index)) {
1659     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1660   }
1661 }
1662 
1663 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1664 {
1665   // method is a handle to a java.lang.reflect.Method object
1666   Method* method_ptr = jvm_get_method_common(method);
1667   methodHandle mh (THREAD, method_ptr);
1668   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1669   const int num_params = mh->method_parameters_length();
1670 
1671   if (num_params < 0) {
1672     // A -1 return value from method_parameters_length means there is no
1673     // parameter data.  Return null to indicate this to the reflection
1674     // API.
1675     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1676     return (jobjectArray)nullptr;
1677   } else {
1678     // Otherwise, we return something up to reflection, even if it is
1679     // a zero-length array.  Why?  Because in some cases this can
1680     // trigger a MalformedParametersException.
1681 
1682     // make sure all the symbols are properly formatted
1683     for (int i = 0; i < num_params; i++) {
1684       MethodParametersElement* params = mh->method_parameters_start();
1685       int index = params[i].name_cp_index;
1686       constantPoolHandle cp(THREAD, mh->constants());
1687       bounds_check(cp, index, CHECK_NULL);
1688 
1689       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1690         THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1691                        "Wrong type at constant pool index");
1692       }
1693 
1694     }
1695 
1696     objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1697     objArrayHandle result (THREAD, result_oop);
1698 
1699     for (int i = 0; i < num_params; i++) {
1700       MethodParametersElement* params = mh->method_parameters_start();
1701       // For a 0 index, give a null symbol
1702       Symbol* sym = 0 != params[i].name_cp_index ?
1703         mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1704       int flags = params[i].flags;
1705       oop param = Reflection::new_parameter(reflected_method, i, sym,
1706                                             flags, CHECK_NULL);
1707       result->obj_at_put(i, param);
1708     }
1709     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1710   }
1711 }
1712 JVM_END
1713 
1714 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1715 
1716 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1717 {
1718   JvmtiVMObjectAllocEventCollector oam;
1719 
1720   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1721   // Exclude primitive types and array types
1722   if (java_lang_Class::is_primitive(ofMirror) ||
1723       java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1724     // Return empty array
1725     oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1726     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1727   }
1728 
1729   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1730   constantPoolHandle cp(THREAD, k->constants());
1731 
1732   // Ensure class is linked
1733   k->link_class(CHECK_NULL);
1734 
1735   // Allocate result
1736   int num_fields;
1737 
1738   if (publicOnly) {
1739     num_fields = 0;
1740     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1741       if (fs.access_flags().is_public()) ++num_fields;
1742     }
1743   } else {
1744     num_fields = k->java_fields_count();
1745   }
1746 
1747   objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1748   objArrayHandle result (THREAD, r);
1749 
1750   int out_idx = 0;
1751   fieldDescriptor fd;
1752   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1753     if (!publicOnly || fs.access_flags().is_public()) {
1754       fd.reinitialize(k, fs.to_FieldInfo());
1755       oop field = Reflection::new_field(&fd, CHECK_NULL);
1756       result->obj_at_put(out_idx, field);
1757       ++out_idx;
1758     }
1759   }
1760   assert(out_idx == num_fields, "just checking");
1761   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1762 }
1763 JVM_END
1764 
1765 // A class is a record if and only if it is final and a direct subclass of
1766 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1767 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1768 {
1769   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1770   if (k != nullptr && k->is_instance_klass()) {
1771     InstanceKlass* ik = InstanceKlass::cast(k);
1772     return ik->is_record();
1773   } else {
1774     return false;
1775   }
1776 }
1777 JVM_END
1778 
1779 // Returns an array containing the components of the Record attribute,
1780 // or null if the attribute is not present.
1781 //
1782 // Note that this function returns the components of the Record attribute
1783 // even if the class is not a record.
1784 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1785 {
1786   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1787 
1788   Array<RecordComponent*>* components = ik->record_components();
1789   if (components != nullptr) {
1790     JvmtiVMObjectAllocEventCollector oam;
1791     constantPoolHandle cp(THREAD, ik->constants());
1792     int length = components->length();
1793     assert(length >= 0, "unexpected record_components length");
1794     objArrayOop record_components =
1795       oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1796     objArrayHandle components_h (THREAD, record_components);
1797 
1798     for (int x = 0; x < length; x++) {
1799       RecordComponent* component = components->at(x);
1800       assert(component != nullptr, "unexpected null record component");
1801       oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1802       components_h->obj_at_put(x, component_oop);
1803     }
1804     return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1805   }
1806 
1807   return nullptr;
1808 }
1809 JVM_END
1810 
1811 static jobjectArray get_class_declared_methods_helper(
1812                                   JNIEnv *env,
1813                                   jclass ofClass, jboolean publicOnly,
1814                                   bool want_constructor,
1815                                   Klass* klass, TRAPS) {
1816 
1817   JvmtiVMObjectAllocEventCollector oam;
1818 
1819   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1820   // Exclude primitive types and array types
1821   if (java_lang_Class::is_primitive(ofMirror)
1822       || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1823     // Return empty array
1824     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1825     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1826   }
1827 
1828   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1829 
1830   // Ensure class is linked
1831   k->link_class(CHECK_NULL);
1832 
1833   Array<Method*>* methods = k->methods();
1834   int methods_length = methods->length();
1835 
1836   // Save original method_idnum in case of redefinition, which can change
1837   // the idnum of obsolete methods.  The new method will have the same idnum
1838   // but if we refresh the methods array, the counts will be wrong.
1839   ResourceMark rm(THREAD);
1840   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1841   int num_methods = 0;
1842 
1843   // Select methods matching the criteria.
1844   for (int i = 0; i < methods_length; i++) {
1845     Method* method = methods->at(i);
1846     if (want_constructor && !method->is_object_constructor()) {
1847       continue;
1848     }
1849     if (!want_constructor &&
1850         (method->is_object_constructor() || method->is_class_initializer() ||
1851          method->is_overpass())) {
1852       continue;
1853     }
1854     if (publicOnly && !method->is_public()) {
1855       continue;
1856     }
1857     idnums->push(method->method_idnum());
1858     ++num_methods;
1859   }
1860 
1861   // Allocate result
1862   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1863   objArrayHandle result (THREAD, r);
1864 
1865   // Now just put the methods that we selected above, but go by their idnum
1866   // in case of redefinition.  The methods can be redefined at any safepoint,
1867   // so above when allocating the oop array and below when creating reflect
1868   // objects.
1869   for (int i = 0; i < num_methods; i++) {
1870     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1871     if (method.is_null()) {
1872       // Method may have been deleted and seems this API can handle null
1873       // Otherwise should probably put a method that throws NSME
1874       result->obj_at_put(i, nullptr);
1875     } else {
1876       oop m;
1877       if (want_constructor) {
1878         assert(method->is_object_constructor(), "must be");
1879         m = Reflection::new_constructor(method, CHECK_NULL);
1880       } else {
1881         m = Reflection::new_method(method, false, CHECK_NULL);
1882       }
1883       result->obj_at_put(i, m);
1884     }
1885   }
1886 
1887   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1888 }
1889 
1890 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1891 {
1892   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1893                                            /*want_constructor*/ false,
1894                                            vmClasses::reflect_Method_klass(), THREAD);
1895 }
1896 JVM_END
1897 
1898 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1899 {
1900   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1901                                            /*want_constructor*/ true,
1902                                            vmClasses::reflect_Constructor_klass(), THREAD);
1903 }
1904 JVM_END
1905 
1906 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1907 {
1908   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1909   InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1910   return c->has_nestmate_access_to(m, THREAD);
1911 }
1912 JVM_END
1913 
1914 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1915 {
1916   // current is not a primitive or array class
1917   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1918   InstanceKlass* host = c->nest_host(THREAD);
1919   return (jclass) (host == nullptr ? nullptr :
1920                    JNIHandles::make_local(THREAD, host->java_mirror()));
1921 }
1922 JVM_END
1923 
1924 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1925 {
1926   // current is not a primitive or array class
1927   ResourceMark rm(THREAD);
1928   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1929   InstanceKlass* host = c->nest_host(THREAD);
1930 
1931   log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1932                               c->external_name(), host->external_name());
1933   {
1934     JvmtiVMObjectAllocEventCollector oam;
1935     Array<u2>* members = host->nest_members();
1936     int length = members == nullptr ? 0 : members->length();
1937 
1938     log_trace(class, nestmates)(" - host has %d listed nest members", length);
1939 
1940     // nest host is first in the array so make it one bigger
1941     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1942                                              length + 1, CHECK_NULL);
1943     objArrayHandle result(THREAD, r);
1944     result->obj_at_put(0, host->java_mirror());
1945     if (length != 0) {
1946       int count = 0;
1947       for (int i = 0; i < length; i++) {
1948         int cp_index = members->at(i);
1949         Klass* k = host->constants()->klass_at(cp_index, THREAD);
1950         if (HAS_PENDING_EXCEPTION) {
1951           if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1952             return nullptr; // propagate VMEs
1953           }
1954           if (log_is_enabled(Trace, class, nestmates)) {
1955             stringStream ss;
1956             char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1957             ss.print(" - resolution of nest member %s failed: ", target_member_class);
1958             java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1959             log_trace(class, nestmates)("%s", ss.as_string());
1960           }
1961           CLEAR_PENDING_EXCEPTION;
1962           continue;
1963         }
1964         if (k->is_instance_klass()) {
1965           InstanceKlass* ik = InstanceKlass::cast(k);
1966           InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1967           if (nest_host_k == host) {
1968             result->obj_at_put(count+1, k->java_mirror());
1969             count++;
1970             log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1971           } else {
1972             log_trace(class, nestmates)(" - skipping member %s with different host %s",
1973                                         ik->external_name(), nest_host_k->external_name());
1974           }
1975         } else {
1976           log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1977                                       k->external_name());
1978         }
1979       }
1980       if (count < length) {
1981         // we had invalid entries so we need to compact the array
1982         log_trace(class, nestmates)(" - compacting array from length %d to %d",
1983                                     length + 1, count + 1);
1984 
1985         objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1986                                                   count + 1, CHECK_NULL);
1987         objArrayHandle result2(THREAD, r2);
1988         for (int i = 0; i < count + 1; i++) {
1989           result2->obj_at_put(i, result->obj_at(i));
1990         }
1991         return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1992       }
1993     }
1994     else {
1995       assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1996     }
1997     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1998   }
1999 }
2000 JVM_END
2001 
2002 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2003 {
2004   oop mirror = JNIHandles::resolve_non_null(current);
2005   assert(!java_lang_Class::is_primitive(mirror), "should not be");
2006   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2007 
2008   ResourceMark rm(THREAD);
2009   log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2010                            ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2011   if (ik->is_sealed()) {
2012     JvmtiVMObjectAllocEventCollector oam;
2013     Array<u2>* subclasses = ik->permitted_subclasses();
2014     int length = subclasses->length();
2015 
2016     log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2017 
2018     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2019                                              length, CHECK_NULL);
2020     objArrayHandle result(THREAD, r);
2021     int count = 0;
2022     for (int i = 0; i < length; i++) {
2023       int cp_index = subclasses->at(i);
2024       Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2025       if (HAS_PENDING_EXCEPTION) {
2026         if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2027           return nullptr; // propagate VMEs
2028         }
2029         if (log_is_enabled(Trace, class, sealed)) {
2030           stringStream ss;
2031           char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2032           ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2033           java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2034           log_trace(class, sealed)("%s", ss.as_string());
2035         }
2036 
2037         CLEAR_PENDING_EXCEPTION;
2038         continue;
2039       }
2040       if (k->is_instance_klass()) {
2041         result->obj_at_put(count++, k->java_mirror());
2042         log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2043       }
2044     }
2045     if (count < length) {
2046       // we had invalid entries so we need to compact the array
2047       objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2048                                                 count, CHECK_NULL);
2049       objArrayHandle result2(THREAD, r2);
2050       for (int i = 0; i < count; i++) {
2051         result2->obj_at_put(i, result->obj_at(i));
2052       }
2053       return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2054     }
2055     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2056   } else {
2057     return nullptr;
2058   }
2059 }
2060 JVM_END
2061 
2062 // Constant pool access //////////////////////////////////////////////////////////
2063 
2064 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2065 {
2066   JvmtiVMObjectAllocEventCollector oam;
2067   oop mirror = JNIHandles::resolve_non_null(cls);
2068   // Return null for primitives and arrays
2069   if (!java_lang_Class::is_primitive(mirror)) {
2070     Klass* k = java_lang_Class::as_Klass(mirror);
2071     if (k->is_instance_klass()) {
2072       InstanceKlass* k_h = InstanceKlass::cast(k);
2073       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2074       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2075       return JNIHandles::make_local(THREAD, jcp());
2076     }
2077   }
2078   return nullptr;
2079 }
2080 JVM_END
2081 
2082 
2083 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2084 {
2085   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2086   return cp->length();
2087 }
2088 JVM_END
2089 
2090 
2091 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2092 {
2093   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2094   bounds_check(cp, index, CHECK_NULL);
2095   constantTag tag = cp->tag_at(index);
2096   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2097     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2098   }
2099   Klass* k = cp->klass_at(index, CHECK_NULL);
2100   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2101 }
2102 JVM_END
2103 
2104 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2105 {
2106   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2107   bounds_check(cp, index, CHECK_NULL);
2108   constantTag tag = cp->tag_at(index);
2109   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2110     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2111   }
2112   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2113   if (k == nullptr) return nullptr;
2114   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2115 }
2116 JVM_END
2117 
2118 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2119   constantTag tag = cp->tag_at(index);
2120   if (!tag.is_method() && !tag.is_interface_method()) {
2121     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2122   }
2123   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2124   Klass* k_o;
2125   if (force_resolution) {
2126     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2127   } else {
2128     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2129     if (k_o == nullptr) return nullptr;
2130   }
2131   InstanceKlass* k = InstanceKlass::cast(k_o);
2132   Symbol* name = cp->uncached_name_ref_at(index);
2133   Symbol* sig  = cp->uncached_signature_ref_at(index);
2134   methodHandle m (THREAD, k->find_method(name, sig));
2135   if (m.is_null()) {
2136     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2137   }
2138   oop method;
2139   if (m->is_object_constructor()) {
2140     method = Reflection::new_constructor(m, CHECK_NULL);
2141   } else {

2142     method = Reflection::new_method(m, true, CHECK_NULL);
2143   }
2144   return JNIHandles::make_local(THREAD, method);
2145 }
2146 
2147 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2148 {
2149   JvmtiVMObjectAllocEventCollector oam;
2150   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2151   bounds_check(cp, index, CHECK_NULL);
2152   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2153   return res;
2154 }
2155 JVM_END
2156 
2157 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2158 {
2159   JvmtiVMObjectAllocEventCollector oam;
2160   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2161   bounds_check(cp, index, CHECK_NULL);
2162   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2163   return res;
2164 }
2165 JVM_END
2166 
2167 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2168   constantTag tag = cp->tag_at(index);
2169   if (!tag.is_field()) {
2170     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2171   }
2172   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2173   Klass* k_o;
2174   if (force_resolution) {
2175     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2176   } else {
2177     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2178     if (k_o == nullptr) return nullptr;
2179   }
2180   InstanceKlass* k = InstanceKlass::cast(k_o);
2181   Symbol* name = cp->uncached_name_ref_at(index);
2182   Symbol* sig  = cp->uncached_signature_ref_at(index);
2183   fieldDescriptor fd;
2184   Klass* target_klass = k->find_field(name, sig, &fd);
2185   if (target_klass == nullptr) {
2186     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2187   }
2188   oop field = Reflection::new_field(&fd, CHECK_NULL);
2189   return JNIHandles::make_local(THREAD, field);
2190 }
2191 
2192 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2193 {
2194   JvmtiVMObjectAllocEventCollector oam;
2195   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2196   bounds_check(cp, index, CHECK_NULL);
2197   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2198   return res;
2199 }
2200 JVM_END
2201 
2202 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2203 {
2204   JvmtiVMObjectAllocEventCollector oam;
2205   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2206   bounds_check(cp, index, CHECK_NULL);
2207   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2208   return res;
2209 }
2210 JVM_END
2211 
2212 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2213 {
2214   JvmtiVMObjectAllocEventCollector oam;
2215   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2216   bounds_check(cp, index, CHECK_NULL);
2217   constantTag tag = cp->tag_at(index);
2218   if (!tag.is_field_or_method()) {
2219     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2220   }
2221   int klass_ref = cp->uncached_klass_ref_index_at(index);
2222   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2223   Symbol*  member_name = cp->uncached_name_ref_at(index);
2224   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2225   objArrayOop  dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2226   objArrayHandle dest(THREAD, dest_o);
2227   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2228   dest->obj_at_put(0, str());
2229   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2230   dest->obj_at_put(1, str());
2231   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2232   dest->obj_at_put(2, str());
2233   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2234 }
2235 JVM_END
2236 
2237 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2238 {
2239   JvmtiVMObjectAllocEventCollector oam;
2240   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2241   bounds_check(cp, index, CHECK_0);
2242   constantTag tag = cp->tag_at(index);
2243   if (!tag.is_field_or_method()) {
2244     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2245   }
2246   return (jint) cp->uncached_klass_ref_index_at(index);
2247 }
2248 JVM_END
2249 
2250 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2251 {
2252   JvmtiVMObjectAllocEventCollector oam;
2253   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2254   bounds_check(cp, index, CHECK_0);
2255   constantTag tag = cp->tag_at(index);
2256   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2257     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2258   }
2259   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2260 }
2261 JVM_END
2262 
2263 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2264 {
2265   JvmtiVMObjectAllocEventCollector oam;
2266   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2267   bounds_check(cp, index, CHECK_NULL);
2268   constantTag tag = cp->tag_at(index);
2269   if (!tag.is_name_and_type()) {
2270     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2271   }
2272   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2273   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2274   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2275   objArrayHandle dest(THREAD, dest_o);
2276   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2277   dest->obj_at_put(0, str());
2278   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2279   dest->obj_at_put(1, str());
2280   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2281 }
2282 JVM_END
2283 
2284 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2285 {
2286   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2287   bounds_check(cp, index, CHECK_0);
2288   constantTag tag = cp->tag_at(index);
2289   if (!tag.is_int()) {
2290     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2291   }
2292   return cp->int_at(index);
2293 }
2294 JVM_END
2295 
2296 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2297 {
2298   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2299   bounds_check(cp, index, CHECK_(0L));
2300   constantTag tag = cp->tag_at(index);
2301   if (!tag.is_long()) {
2302     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2303   }
2304   return cp->long_at(index);
2305 }
2306 JVM_END
2307 
2308 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2309 {
2310   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2311   bounds_check(cp, index, CHECK_(0.0f));
2312   constantTag tag = cp->tag_at(index);
2313   if (!tag.is_float()) {
2314     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2315   }
2316   return cp->float_at(index);
2317 }
2318 JVM_END
2319 
2320 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2321 {
2322   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2323   bounds_check(cp, index, CHECK_(0.0));
2324   constantTag tag = cp->tag_at(index);
2325   if (!tag.is_double()) {
2326     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2327   }
2328   return cp->double_at(index);
2329 }
2330 JVM_END
2331 
2332 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2333 {
2334   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2335   bounds_check(cp, index, CHECK_NULL);
2336   constantTag tag = cp->tag_at(index);
2337   if (!tag.is_string()) {
2338     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2339   }
2340   oop str = cp->string_at(index, CHECK_NULL);
2341   return (jstring) JNIHandles::make_local(THREAD, str);
2342 }
2343 JVM_END
2344 
2345 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2346 {
2347   JvmtiVMObjectAllocEventCollector oam;
2348   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2349   bounds_check(cp, index, CHECK_NULL);
2350   constantTag tag = cp->tag_at(index);
2351   if (!tag.is_symbol()) {
2352     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2353   }
2354   Symbol* sym = cp->symbol_at(index);
2355   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2356   return (jstring) JNIHandles::make_local(THREAD, str());
2357 }
2358 JVM_END
2359 
2360 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2361 {
2362   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2363   bounds_check(cp, index, CHECK_0);
2364   constantTag tag = cp->tag_at(index);
2365   jbyte result = tag.value();
2366   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2367   // they are changed to the corresponding tags from the JVM spec, so that java code in
2368   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2369   if (tag.is_klass_or_reference()) {
2370       result = JVM_CONSTANT_Class;
2371   } else if (tag.is_string_index()) {
2372       result = JVM_CONSTANT_String;
2373   } else if (tag.is_method_type_in_error()) {
2374       result = JVM_CONSTANT_MethodType;
2375   } else if (tag.is_method_handle_in_error()) {
2376       result = JVM_CONSTANT_MethodHandle;
2377   } else if (tag.is_dynamic_constant_in_error()) {
2378       result = JVM_CONSTANT_Dynamic;
2379   }
2380   return result;
2381 }
2382 JVM_END
2383 
2384 // Assertion support. //////////////////////////////////////////////////////////
2385 
2386 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2387   assert(cls != nullptr, "bad class");
2388 
2389   oop r = JNIHandles::resolve(cls);
2390   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2391   if (java_lang_Class::is_primitive(r)) return false;
2392 
2393   Klass* k = java_lang_Class::as_Klass(r);
2394   assert(k->is_instance_klass(), "must be an instance klass");
2395   if (!k->is_instance_klass()) return false;
2396 
2397   ResourceMark rm(THREAD);
2398   const char* name = k->name()->as_C_string();
2399   bool system_class = k->class_loader() == nullptr;
2400   return JavaAssertions::enabled(name, system_class);
2401 
2402 JVM_END
2403 
2404 
2405 // Return a new AssertionStatusDirectives object with the fields filled in with
2406 // command-line assertion arguments (i.e., -ea, -da).
2407 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2408   JvmtiVMObjectAllocEventCollector oam;
2409   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2410   return JNIHandles::make_local(THREAD, asd);
2411 JVM_END
2412 
2413 // Verification ////////////////////////////////////////////////////////////////////////////////
2414 
2415 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2416 
2417 // RedefineClasses support: bug 6214132 caused verification to fail.
2418 // All functions from this section, unless noted otherwise, should call the functions
2419 //   get_klass_considering_redefinition(), or
2420 //   get_instance_klass_considering_redefinition()
2421 // These functions return JvmtiThreadState::_scratch_class if the verifier
2422 // was invoked in the middle of the redefinition of cls.
2423 // See jvmtiThreadState.hpp for details.
2424 
2425 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2426   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2427   if (k->is_instance_klass()) {
2428     return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2429   } else {
2430     return k;
2431   }
2432 }
2433 
2434 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2435   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2436   return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2437 }
2438 
2439 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2440   oop mirror = JNIHandles::resolve_non_null(cls);
2441   if (java_lang_Class::is_primitive(mirror)) {
2442     return JNI_FALSE;
2443   }
2444   Klass* k = java_lang_Class::as_Klass(mirror);
2445   // This isn't necessary since answer is the same because redefinition
2446   // has already checked this matches for the scratch class.
2447   // k = get_klass_considering_redefinition(cls, thread)
2448   jboolean result = k->is_interface();
2449   assert(!result || k->is_instance_klass(),
2450          "all interfaces are instance types");
2451   return result;
2452 JVM_END
2453 
2454 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2455   // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2456   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2457   return k->name()->as_utf8();
2458 JVM_END
2459 
2460 
2461 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2462   Klass* k = get_klass_considering_redefinition(cls, thread);
2463   // types will have length zero if this is not an InstanceKlass
2464   // (length is determined by call to JVM_GetClassCPEntriesCount)
2465   if (k->is_instance_klass()) {
2466     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2467     for (int index = cp->length() - 1; index >= 0; index--) {
2468       constantTag tag = cp->tag_at(index);
2469       types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2470     }
2471   }
2472 JVM_END
2473 
2474 
2475 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2476   Klass* k = get_klass_considering_redefinition(cls, thread);
2477   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2478 JVM_END
2479 
2480 
2481 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2482   Klass* k = get_klass_considering_redefinition(cls, thread);
2483   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2484 JVM_END
2485 
2486 
2487 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2488   Klass* k = get_klass_considering_redefinition(cls, thread);
2489   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2490 JVM_END
2491 
2492 
2493 // The following methods, used for the verifier, are never called with
2494 // array klasses, so a direct cast to InstanceKlass is safe.
2495 // Typically, these methods are called in a loop with bounds determined
2496 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2497 // zero for arrays.
2498 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2499   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2500   Method* method = ik->methods()->at(method_index);
2501   int length = method->checked_exceptions_length();
2502   if (length > 0) {
2503     CheckedExceptionElement* table= method->checked_exceptions_start();
2504     for (int i = 0; i < length; i++) {
2505       exceptions[i] = table[i].class_cp_index;
2506     }
2507   }
2508 JVM_END
2509 
2510 
2511 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2512   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2513   Method* method = ik->methods()->at(method_index);
2514   return method->checked_exceptions_length();
2515 JVM_END
2516 
2517 
2518 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2519   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2520   Method* method = ik->methods()->at(method_index);
2521   memcpy(code, method->code_base(), method->code_size());
2522 JVM_END
2523 
2524 
2525 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2526   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2527   Method* method = ik->methods()->at(method_index);
2528   return method->code_size();
2529 JVM_END
2530 
2531 
2532 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2533   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2534   Method* method = ik->methods()->at(method_index);
2535   ExceptionTable extable(method);
2536   entry->start_pc   = extable.start_pc(entry_index);
2537   entry->end_pc     = extable.end_pc(entry_index);
2538   entry->handler_pc = extable.handler_pc(entry_index);
2539   entry->catchType  = extable.catch_type_index(entry_index);
2540 JVM_END
2541 
2542 
2543 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2544   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2545   Method* method = ik->methods()->at(method_index);
2546   return method->exception_table_length();
2547 JVM_END
2548 
2549 
2550 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2551   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2552   Method* method = ik->methods()->at(method_index);
2553   return method->access_flags().as_method_flags();
2554 JVM_END
2555 
2556 
2557 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2558   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2559   return ik->field_access_flags(field_index);
2560 JVM_END
2561 
2562 
2563 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2564   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2565   Method* method = ik->methods()->at(method_index);
2566   return method->max_locals();
2567 JVM_END
2568 
2569 
2570 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2571   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2572   Method* method = ik->methods()->at(method_index);
2573   return method->size_of_parameters();
2574 JVM_END
2575 
2576 
2577 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2578   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2579   Method* method = ik->methods()->at(method_index);
2580   return method->verifier_max_stack();
2581 JVM_END
2582 
2583 
2584 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2585   ResourceMark rm(THREAD);
2586   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2587   Method* method = ik->methods()->at(method_index);
2588   return method->is_object_constructor();
2589 JVM_END
2590 
2591 
2592 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2593   ResourceMark rm(THREAD);
2594   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2595   Method* method = ik->methods()->at(method_index);
2596   return method->is_overpass();
2597 JVM_END
2598 
2599 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2600   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2601   Method* method = ik->methods()->at(method_index);
2602   return method->name()->as_utf8();
2603 JVM_END
2604 
2605 
2606 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2607   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2608   Method* method = ik->methods()->at(method_index);
2609   return method->signature()->as_utf8();
2610 JVM_END
2611 
2612 /**
2613  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2614  * read entries in the constant pool.  Since the old verifier always
2615  * works on a copy of the code, it will not see any rewriting that
2616  * may possibly occur in the middle of verification.  So it is important
2617  * that nothing it calls tries to use the cpCache instead of the raw
2618  * constant pool, so we must use cp->uncached_x methods when appropriate.
2619  */
2620 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2621   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2622   ConstantPool* cp = ik->constants();
2623   switch (cp->tag_at(cp_index).value()) {
2624     case JVM_CONSTANT_Fieldref:
2625       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2626     default:
2627       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2628   }
2629   ShouldNotReachHere();
2630   return nullptr;
2631 JVM_END
2632 
2633 
2634 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2635   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2636   ConstantPool* cp = ik->constants();
2637   switch (cp->tag_at(cp_index).value()) {
2638     case JVM_CONSTANT_InterfaceMethodref:
2639     case JVM_CONSTANT_Methodref:
2640       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2641     default:
2642       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2643   }
2644   ShouldNotReachHere();
2645   return nullptr;
2646 JVM_END
2647 
2648 
2649 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2650   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2651   ConstantPool* cp = ik->constants();
2652   switch (cp->tag_at(cp_index).value()) {
2653     case JVM_CONSTANT_InterfaceMethodref:
2654     case JVM_CONSTANT_Methodref:
2655       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2656     default:
2657       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2658   }
2659   ShouldNotReachHere();
2660   return nullptr;
2661 JVM_END
2662 
2663 
2664 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2665   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2666   ConstantPool* cp = ik->constants();
2667   switch (cp->tag_at(cp_index).value()) {
2668     case JVM_CONSTANT_Fieldref:
2669       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2670     default:
2671       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2672   }
2673   ShouldNotReachHere();
2674   return nullptr;
2675 JVM_END
2676 
2677 
2678 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2679   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2680   ConstantPool* cp = ik->constants();
2681   Symbol* classname = cp->klass_name_at(cp_index);
2682   return classname->as_utf8();
2683 JVM_END
2684 
2685 
2686 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2687   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2688   ConstantPool* cp = ik->constants();
2689   switch (cp->tag_at(cp_index).value()) {
2690     case JVM_CONSTANT_Fieldref: {
2691       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2692       Symbol* classname = cp->klass_name_at(class_index);
2693       return classname->as_utf8();
2694     }
2695     default:
2696       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2697   }
2698   ShouldNotReachHere();
2699   return nullptr;
2700 JVM_END
2701 
2702 
2703 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2704   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2705   ConstantPool* cp = ik->constants();
2706   switch (cp->tag_at(cp_index).value()) {
2707     case JVM_CONSTANT_Methodref:
2708     case JVM_CONSTANT_InterfaceMethodref: {
2709       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2710       Symbol* classname = cp->klass_name_at(class_index);
2711       return classname->as_utf8();
2712     }
2713     default:
2714       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2715   }
2716   ShouldNotReachHere();
2717   return nullptr;
2718 JVM_END
2719 
2720 
2721 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2722   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2723   InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2724   ConstantPool* cp = ik->constants();
2725   ConstantPool* cp_called = ik_called->constants();
2726   switch (cp->tag_at(cp_index).value()) {
2727     case JVM_CONSTANT_Fieldref: {
2728       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2729       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2730       for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2731         if (fs.name() == name && fs.signature() == signature) {
2732           return fs.access_flags().as_field_flags();
2733         }
2734       }
2735       return -1;
2736     }
2737     default:
2738       fatal("JVM_GetCPFieldModifiers: illegal constant");
2739   }
2740   ShouldNotReachHere();
2741   return 0;
2742 JVM_END
2743 
2744 
2745 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2746   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2747   InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2748   ConstantPool* cp = ik->constants();
2749   switch (cp->tag_at(cp_index).value()) {
2750     case JVM_CONSTANT_Methodref:
2751     case JVM_CONSTANT_InterfaceMethodref: {
2752       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2753       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2754       Array<Method*>* methods = ik_called->methods();
2755       int methods_count = methods->length();
2756       for (int i = 0; i < methods_count; i++) {
2757         Method* method = methods->at(i);
2758         if (method->name() == name && method->signature() == signature) {
2759             return method->access_flags().as_method_flags();
2760         }
2761       }
2762       return -1;
2763     }
2764     default:
2765       fatal("JVM_GetCPMethodModifiers: illegal constant");
2766   }
2767   ShouldNotReachHere();
2768   return 0;
2769 JVM_END
2770 
2771 
2772 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2773 
2774 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2775   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2776 JVM_END
2777 
2778 
2779 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2780   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2781   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2782   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2783   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2784   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2785 JVM_END
2786 
2787 // Printing support //////////////////////////////////////////////////
2788 extern "C" {
2789 
2790 ATTRIBUTE_PRINTF(3, 0)
2791 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2792   // Reject count values that are negative signed values converted to
2793   // unsigned; see bug 4399518, 4417214
2794   if ((intptr_t)count <= 0) return -1;
2795 
2796   int result = os::vsnprintf(str, count, fmt, args);
2797   if (result > 0 && (size_t)result >= count) {
2798     result = -1;
2799   }
2800 
2801   return result;
2802 }
2803 
2804 ATTRIBUTE_PRINTF(3, 4)
2805 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2806   va_list args;
2807   int len;
2808   va_start(args, fmt);
2809   len = jio_vsnprintf(str, count, fmt, args);
2810   va_end(args);
2811   return len;
2812 }
2813 
2814 ATTRIBUTE_PRINTF(2, 3)
2815 int jio_fprintf(FILE* f, const char *fmt, ...) {
2816   int len;
2817   va_list args;
2818   va_start(args, fmt);
2819   len = jio_vfprintf(f, fmt, args);
2820   va_end(args);
2821   return len;
2822 }
2823 
2824 ATTRIBUTE_PRINTF(2, 0)
2825 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2826   if (Arguments::vfprintf_hook() != nullptr) {
2827      return Arguments::vfprintf_hook()(f, fmt, args);
2828   } else {
2829     return vfprintf(f, fmt, args);
2830   }
2831 }
2832 
2833 ATTRIBUTE_PRINTF(1, 2)
2834 JNIEXPORT int jio_printf(const char *fmt, ...) {
2835   int len;
2836   va_list args;
2837   va_start(args, fmt);
2838   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2839   va_end(args);
2840   return len;
2841 }
2842 
2843 // HotSpot specific jio method
2844 void jio_print(const char* s, size_t len) {
2845   // Try to make this function as atomic as possible.
2846   if (Arguments::vfprintf_hook() != nullptr) {
2847     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2848   } else {
2849     // Make an unused local variable to avoid warning from gcc compiler.
2850     bool dummy = os::write(defaultStream::output_fd(), s, len);
2851   }
2852 }
2853 
2854 } // Extern C
2855 
2856 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2857 
2858 // In most of the JVM thread support functions we need to access the
2859 // thread through a ThreadsListHandle to prevent it from exiting and
2860 // being reclaimed while we try to operate on it. The exceptions to this
2861 // rule are when operating on the current thread, or if the monitor of
2862 // the target java.lang.Thread is locked at the Java level - in both
2863 // cases the target cannot exit.
2864 
2865 static void thread_entry(JavaThread* thread, TRAPS) {
2866   HandleMark hm(THREAD);
2867   Handle obj(THREAD, thread->threadObj());
2868   JavaValue result(T_VOID);
2869   JavaCalls::call_virtual(&result,
2870                           obj,
2871                           vmClasses::Thread_klass(),
2872                           vmSymbols::run_method_name(),
2873                           vmSymbols::void_method_signature(),
2874                           THREAD);
2875 }
2876 
2877 
2878 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2879 #if INCLUDE_CDS
2880   if (CDSConfig::allow_only_single_java_thread()) {
2881     // During java -Xshare:dump, if we allow multiple Java threads to
2882     // execute in parallel, symbols and classes may be loaded in
2883     // random orders which will make the resulting CDS archive
2884     // non-deterministic.
2885     //
2886     // Lucikly, during java -Xshare:dump, it's important to run only
2887     // the code in the main Java thread (which is NOT started here) that
2888     // creates the module graph, etc. It's safe to not start the other
2889     // threads which are launched by class static initializers
2890     // (ReferenceHandler, FinalizerThread and CleanerImpl).
2891     if (log_is_enabled(Info, aot)) {
2892       ResourceMark rm;
2893       oop t = JNIHandles::resolve_non_null(jthread);
2894       log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2895     }
2896     return;
2897   }
2898 #endif
2899   JavaThread *native_thread = nullptr;
2900 
2901   // We cannot hold the Threads_lock when we throw an exception,
2902   // due to rank ordering issues. Example:  we might need to grab the
2903   // Heap_lock while we construct the exception.
2904   bool throw_illegal_thread_state = false;
2905 
2906   // We must release the Threads_lock before we can post a jvmti event
2907   // in Thread::start.
2908   {
2909     ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2910     // Ensure that the C++ Thread and OSThread structures aren't freed before
2911     // we operate.
2912     MutexLocker ml(Threads_lock);
2913 
2914     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2915     // re-starting an already started thread, so we should usually find
2916     // that the JavaThread is null. However for a JNI attached thread
2917     // there is a small window between the Thread object being created
2918     // (with its JavaThread set) and the update to its threadStatus, so we
2919     // have to check for this
2920     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2921       throw_illegal_thread_state = true;
2922     } else {
2923       jlong size =
2924              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2925       // Allocate the C++ Thread structure and create the native thread.  The
2926       // stack size retrieved from java is 64-bit signed, but the constructor takes
2927       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2928       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2929       //  - Avoid passing negative values which would result in really large stacks.
2930       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2931       size_t sz = size > 0 ? (size_t) size : 0;
2932       native_thread = new JavaThread(&thread_entry, sz);
2933 
2934       // At this point it may be possible that no osthread was created for the
2935       // JavaThread due to lack of memory. Check for this situation and throw
2936       // an exception if necessary. Eventually we may want to change this so
2937       // that we only grab the lock if the thread was created successfully -
2938       // then we can also do this check and throw the exception in the
2939       // JavaThread constructor.
2940       if (native_thread->osthread() != nullptr) {
2941         // Note: the current thread is not being used within "prepare".
2942         native_thread->prepare(jthread);
2943       }
2944     }
2945   }
2946 
2947   if (throw_illegal_thread_state) {
2948     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2949   }
2950 
2951   assert(native_thread != nullptr, "Starting null thread?");
2952 
2953   if (native_thread->osthread() == nullptr) {
2954     ResourceMark rm(thread);
2955     log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2956                             JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2957     // No one should hold a reference to the 'native_thread'.
2958     native_thread->smr_delete();
2959     if (JvmtiExport::should_post_resource_exhausted()) {
2960       JvmtiExport::post_resource_exhausted(
2961         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2962         os::native_thread_creation_failed_msg());
2963     }
2964     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2965               os::native_thread_creation_failed_msg());
2966   }
2967 
2968   JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2969 
2970   Thread::start(native_thread);
2971 
2972 JVM_END
2973 
2974 
2975 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2976   ThreadsListHandle tlh(thread);
2977   oop java_thread = nullptr;
2978   JavaThread* receiver = nullptr;
2979   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2980   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2981 
2982   if (is_alive) {
2983     // jthread refers to a live JavaThread.
2984     Thread::set_priority(receiver, (ThreadPriority)prio);
2985   }
2986   // Implied else: If the JavaThread hasn't started yet, then the
2987   // priority set in the java.lang.Thread object above will be pushed
2988   // down when it does start.
2989 JVM_END
2990 
2991 
2992 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2993   HOTSPOT_THREAD_YIELD();
2994   os::naked_yield();
2995 JVM_END
2996 
2997 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2998   if (nanos < 0) {
2999     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3000   }
3001 
3002   if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3003     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3004   }
3005 
3006   // Save current thread state and restore it at the end of this block.
3007   // And set new thread state to SLEEPING.
3008   JavaThreadSleepState jtss(thread);
3009 
3010   HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3011 
3012   if (nanos == 0) {
3013     os::naked_yield();
3014   } else {
3015     ThreadState old_state = thread->osthread()->get_state();
3016     thread->osthread()->set_state(SLEEPING);
3017     if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3018       // An asynchronous exception could have been thrown on
3019       // us while we were sleeping. We do not overwrite those.
3020       if (!HAS_PENDING_EXCEPTION) {
3021         HOTSPOT_THREAD_SLEEP_END(1);
3022         if (!thread->has_async_exception_condition()) {
3023           // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3024           // to properly restore the thread state.  That's likely wrong.
3025           THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3026         }
3027       }
3028     }
3029     thread->osthread()->set_state(old_state);
3030   }
3031   HOTSPOT_THREAD_SLEEP_END(0);
3032 JVM_END
3033 
3034 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3035   oop jthread = thread->threadObj();
3036   assert(jthread != nullptr, "no current carrier thread!");
3037   return JNIHandles::make_local(THREAD, jthread);
3038 JVM_END
3039 
3040 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3041   oop theThread = thread->vthread();
3042   assert(theThread != (oop)nullptr, "no current thread!");
3043   return JNIHandles::make_local(THREAD, theThread);
3044 JVM_END
3045 
3046 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3047                                      jobject theThread))
3048   oop threadObj = JNIHandles::resolve(theThread);
3049   thread->set_vthread(threadObj);
3050 
3051   // Set _monitor_owner_id of new current Thread
3052   thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3053 
3054   JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3055 JVM_END
3056 
3057 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3058   return ThreadIdentifier::unsafe_offset();
3059 JVM_END
3060 
3061 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3062   ThreadsListHandle tlh(thread);
3063   JavaThread* receiver = nullptr;
3064   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3065   if (is_alive) {
3066     // jthread refers to a live JavaThread.
3067     receiver->interrupt();
3068   }
3069 JVM_END
3070 
3071 // Return true iff the current thread has locked the object passed in
3072 
3073 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3074   if (obj == nullptr) {
3075     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3076   }
3077   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3078   return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3079 JVM_END
3080 
3081 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3082   oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3083   return JNIHandles::make_local(THREAD, trace);
3084 JVM_END
3085 
3086 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3087 #if INCLUDE_JVMTI
3088   oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3089   return JNIHandles::make_local(THREAD, snapshot);
3090 #else
3091   THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3092 #endif
3093 JVM_END
3094 
3095 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3096   // We don't use a ThreadsListHandle here because the current thread
3097   // must be alive.
3098   oop java_thread = JNIHandles::resolve_non_null(jthread);
3099   JavaThread* thr = java_lang_Thread::thread(java_thread);
3100   if (thread == thr && !thr->has_attached_via_jni()) {
3101     // Thread naming is only supported for the current thread and
3102     // we don't set the name of an attached thread to avoid stepping
3103     // on other programs.
3104     ResourceMark rm(thread);
3105     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3106     os::set_native_thread_name(thread_name);
3107   }
3108 JVM_END
3109 
3110 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3111   oop theCache = thread->scopedValueCache();
3112   return JNIHandles::make_local(THREAD, theCache);
3113 JVM_END
3114 
3115 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3116                                        jobject theCache))
3117   arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3118   thread->set_scopedValueCache(objs);
3119 JVM_END
3120 
3121 
3122 // java.lang.Package ////////////////////////////////////////////////////////////////
3123 
3124 
3125 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3126   ResourceMark rm(THREAD);
3127   JvmtiVMObjectAllocEventCollector oam;
3128   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3129   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3130 return (jstring) JNIHandles::make_local(THREAD, result);
3131 JVM_END
3132 
3133 
3134 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3135   JvmtiVMObjectAllocEventCollector oam;
3136   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3137   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3138 JVM_END
3139 
3140 
3141 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3142 
3143 
3144 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3145   MonitorLocker ml(Heap_lock);
3146   oop ref = Universe::reference_pending_list();
3147   if (ref != nullptr) {
3148     Universe::clear_reference_pending_list();
3149   }
3150   return JNIHandles::make_local(THREAD, ref);
3151 JVM_END
3152 
3153 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3154   MonitorLocker ml(Heap_lock);
3155   return Universe::has_reference_pending_list();
3156 JVM_END
3157 
3158 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3159   MonitorLocker ml(Heap_lock);
3160   while (!Universe::has_reference_pending_list()) {
3161     ml.wait();
3162   }
3163 JVM_END
3164 
3165 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3166   oop ref_oop = JNIHandles::resolve_non_null(ref);
3167   // PhantomReference has its own implementation of get().
3168   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3169   oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3170   return JNIHandles::make_local(THREAD, referent);
3171 JVM_END
3172 
3173 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3174   oop ref_oop = JNIHandles::resolve_non_null(ref);
3175   // PhantomReference has its own implementation of refersTo().
3176   // See: JVM_PhantomReferenceRefersTo
3177   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3178   oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3179   return referent == JNIHandles::resolve(o);
3180 JVM_END
3181 
3182 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3183   oop ref_oop = JNIHandles::resolve_non_null(ref);
3184   // FinalReference has it's own implementation of clear().
3185   assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3186   if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3187     // If the referent has already been cleared then done.
3188     // However, if the referent is dead but has not yet been cleared by
3189     // concurrent reference processing, it should NOT be cleared here.
3190     // Instead, clearing should be left to the GC.  Clearing it here could
3191     // detectably lose an expected notification, which is impossible with
3192     // STW reference processing.  The clearing in enqueue() doesn't have
3193     // this problem, since the enqueue covers the notification, but it's not
3194     // worth the effort to handle that case specially.
3195     return;
3196   }
3197   java_lang_ref_Reference::clear_referent(ref_oop);
3198 JVM_END
3199 
3200 
3201 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3202 
3203 
3204 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3205   oop ref_oop = JNIHandles::resolve_non_null(ref);
3206   oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3207   return referent == JNIHandles::resolve(o);
3208 JVM_END
3209 
3210 
3211 // ObjectInputStream ///////////////////////////////////////////////////////////////
3212 
3213 // Return the first user-defined class loader up the execution stack, or null
3214 // if only code from the bootstrap or platform class loader is on the stack.
3215 
3216 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3217   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3218     InstanceKlass* ik = vfst.method()->method_holder();
3219     oop loader = ik->class_loader();
3220     if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3221       return JNIHandles::make_local(THREAD, loader);
3222     }
3223   }
3224   return nullptr;
3225 JVM_END
3226 
3227 
3228 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3229 
3230 
3231 // resolve array handle and check arguments
3232 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3233   if (arr == nullptr) {
3234     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3235   }
3236   oop a = JNIHandles::resolve_non_null(arr);
3237   if (!a->is_array()) {
3238     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3239   } else if (type_array_only && !a->is_typeArray()) {
3240     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3241   }
3242   return arrayOop(a);
3243 }
3244 
3245 
3246 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3247   arrayOop a = check_array(env, arr, false, CHECK_0);
3248   return a->length();
3249 JVM_END
3250 
3251 
3252 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3253   JvmtiVMObjectAllocEventCollector oam;
3254   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3255   jvalue value;
3256   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3257   oop box = Reflection::box(&value, type, CHECK_NULL);
3258   return JNIHandles::make_local(THREAD, box);
3259 JVM_END
3260 
3261 
3262 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3263   jvalue value;
3264   value.i = 0; // to initialize value before getting used in CHECK
3265   arrayOop a = check_array(env, arr, true, CHECK_(value));
3266   assert(a->is_typeArray(), "just checking");
3267   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3268   BasicType wide_type = (BasicType) wCode;
3269   if (type != wide_type) {
3270     Reflection::widen(&value, type, wide_type, CHECK_(value));
3271   }
3272   return value;
3273 JVM_END
3274 
3275 
3276 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3277   arrayOop a = check_array(env, arr, false, CHECK);
3278   oop box = JNIHandles::resolve(val);
3279   jvalue value;
3280   value.i = 0; // to initialize value before getting used in CHECK
3281   BasicType value_type;
3282   if (a->is_objArray()) {
3283     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3284     value_type = Reflection::unbox_for_regular_object(box, &value);
3285   } else {
3286     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3287   }
3288   Reflection::array_set(&value, a, index, value_type, CHECK);
3289 JVM_END
3290 
3291 
3292 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3293   arrayOop a = check_array(env, arr, true, CHECK);
3294   assert(a->is_typeArray(), "just checking");
3295   BasicType value_type = (BasicType) vCode;
3296   Reflection::array_set(&v, a, index, value_type, CHECK);
3297 JVM_END
3298 
3299 
3300 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3301   JvmtiVMObjectAllocEventCollector oam;
3302   oop element_mirror = JNIHandles::resolve(eltClass);
3303   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3304   return JNIHandles::make_local(THREAD, result);
3305 JVM_END
3306 
3307 
3308 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3309   JvmtiVMObjectAllocEventCollector oam;
3310   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3311   oop element_mirror = JNIHandles::resolve(eltClass);
3312   assert(dim_array->is_typeArray(), "just checking");
3313   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3314   return JNIHandles::make_local(THREAD, result);
3315 JVM_END
3316 
3317 
3318 // Library support ///////////////////////////////////////////////////////////////////////////
3319 
3320 JVM_LEAF(void*, JVM_LoadZipLibrary())
3321   return ZipLibrary::handle();
3322 JVM_END
3323 
3324 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3325   //%note jvm_ct
3326   char ebuf[1024];
3327   void *load_result;
3328   {
3329     ThreadToNativeFromVM ttnfvm(thread);
3330     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3331   }
3332   if (load_result == nullptr) {
3333     if (throwException) {
3334       char msg[1024];
3335       jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3336       // Since 'ebuf' may contain a string encoded using
3337       // platform encoding scheme, we need to pass
3338       // Exceptions::unsafe_to_utf8 to the new_exception method
3339       // as the last argument. See bug 6367357.
3340       Handle h_exception =
3341         Exceptions::new_exception(thread,
3342                                   vmSymbols::java_lang_UnsatisfiedLinkError(),
3343                                   msg, Exceptions::unsafe_to_utf8);
3344 
3345       THROW_HANDLE_NULL(h_exception);
3346     } else {
3347       log_info(library)("Failed to load library %s", name);
3348       return load_result;
3349     }
3350   }
3351   log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3352   return load_result;
3353 JVM_END
3354 
3355 
3356 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3357   os::dll_unload(handle);
3358   log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3359 JVM_END
3360 
3361 
3362 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3363   void* find_result = os::dll_lookup(handle, name);
3364   log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3365                     find_result != nullptr ? "Found" : "Failed to find",
3366                     name, p2i(handle));
3367   return find_result;
3368 JVM_END
3369 
3370 
3371 // JNI version ///////////////////////////////////////////////////////////////////////////////
3372 
3373 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3374   return Threads::is_supported_jni_version_including_1_1(version);
3375 JVM_END
3376 
3377 
3378 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3379   return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3380 JVM_END
3381 
3382 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3383   return Arguments::is_valhalla_enabled() ? JNI_TRUE : JNI_FALSE;
3384 JVM_END
3385 
3386 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3387   return VMContinuations ? JNI_TRUE : JNI_FALSE;
3388 JVM_END
3389 
3390 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3391   return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3392 JVM_END
3393 
3394 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3395   return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3396 JVM_END
3397 
3398 // String support ///////////////////////////////////////////////////////////////////////////
3399 
3400 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3401   JvmtiVMObjectAllocEventCollector oam;
3402   if (str == nullptr) return nullptr;
3403   oop string = JNIHandles::resolve_non_null(str);
3404   oop result = StringTable::intern(string, CHECK_NULL);
3405   return (jstring) JNIHandles::make_local(THREAD, result);
3406 JVM_END
3407 
3408 
3409 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3410 
3411 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3412 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3413 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3414 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3415 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3416 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3417 
3418 
3419 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3420   VM_Exit::block_if_vm_exited();
3421   return new PlatformMutex();
3422 }
3423 
3424 
3425 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3426   VM_Exit::block_if_vm_exited();
3427   delete ((PlatformMutex*) mon);
3428 }
3429 
3430 
3431 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3432   VM_Exit::block_if_vm_exited();
3433   ((PlatformMutex*) mon)->lock();
3434   return 0;
3435 }
3436 
3437 
3438 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3439   VM_Exit::block_if_vm_exited();
3440   ((PlatformMutex*) mon)->unlock();
3441 }
3442 
3443 
3444 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3445 
3446 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3447                                     Handle loader, jboolean throwError, TRAPS) {
3448   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3449 
3450   // Check if we should initialize the class
3451   if (init && klass->is_instance_klass()) {
3452     klass->initialize(CHECK_NULL);
3453   }
3454   return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3455 }
3456 
3457 
3458 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3459 
3460 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3461   Handle method_handle;
3462   if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3463     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3464     Handle receiver(THREAD, JNIHandles::resolve(obj));
3465     objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3466     assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3467 
3468     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3469     jobject res = JNIHandles::make_local(THREAD, result);
3470     if (JvmtiExport::should_post_vm_object_alloc()) {
3471       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3472       assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3473       if (java_lang_Class::is_primitive(ret_type)) {
3474         // Only for primitive type vm allocates memory for java object.
3475         // See box() method.
3476         JvmtiExport::post_vm_object_alloc(thread, result);
3477       }
3478     }
3479     return res;
3480   } else {
3481     THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3482   }
3483 JVM_END
3484 
3485 
3486 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3487   objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3488   assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3489   oop constructor_mirror = JNIHandles::resolve(c);

3490   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3491   jobject res = JNIHandles::make_local(THREAD, result);
3492   if (JvmtiExport::should_post_vm_object_alloc()) {
3493     JvmtiExport::post_vm_object_alloc(thread, result);
3494   }
3495   return res;
3496 JVM_END
3497 
3498 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3499   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3500   HeapShared::initialize_from_archived_subgraph(THREAD, k);
3501 JVM_END
3502 
3503 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3504                                               jclass caller,
3505                                               jstring interfaceMethodName,
3506                                               jobject factoryType,
3507                                               jobject interfaceMethodType,
3508                                               jobject implementationMember,
3509                                               jobject dynamicMethodType,
3510                                               jclass lambdaProxyClass))
3511 #if INCLUDE_CDS
3512   if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3513     return;
3514   }
3515 
3516   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3517   if (caller_ik->is_hidden()) {
3518     // Hidden classes not of type lambda proxy classes are currently not being archived.
3519     // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3520     // registered for archiving.
3521     return;
3522   }
3523   InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3524   assert(lambda_ik->is_hidden(), "must be a hidden class");
3525   assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3526 
3527   Symbol* interface_method_name = nullptr;
3528   if (interfaceMethodName != nullptr) {
3529     interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3530   }
3531   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3532   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3533 
3534   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3535   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3536 
3537   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3538   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3539   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3540 
3541   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3542   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3543 
3544   LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3545                                                      interface_method_type, m, dynamic_method_type, THREAD);
3546 #endif // INCLUDE_CDS
3547 JVM_END
3548 
3549 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3550                                                         jclass caller,
3551                                                         jstring interfaceMethodName,
3552                                                         jobject factoryType,
3553                                                         jobject interfaceMethodType,
3554                                                         jobject implementationMember,
3555                                                         jobject dynamicMethodType))
3556 #if INCLUDE_CDS
3557 
3558   if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3559       implementationMember == nullptr || dynamicMethodType == nullptr) {
3560     THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3561   }
3562 
3563   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3564   if (!caller_ik->in_aot_cache()) {
3565     // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3566     return nullptr;
3567   }
3568 
3569   Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3570   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3571   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3572 
3573   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3574   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3575 
3576   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3577   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3578   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3579 
3580   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3581   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3582 
3583   InstanceKlass* loaded_lambda =
3584     LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3585                                                                interface_method_type, m, dynamic_method_type,
3586                                                                CHECK_(nullptr));
3587   return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3588 #else
3589   return nullptr;
3590 #endif // INCLUDE_CDS
3591 JVM_END
3592 
3593 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3594   if (CDSConfig::is_dumping_static_archive()) {
3595     // We do this so that the default CDS archive can be deterministic.
3596     const char* release = VM_Version::vm_release();
3597     const char* dbg_level = VM_Version::jdk_debug_level();
3598     const char* version = VM_Version::internal_vm_info_string();
3599     jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3600                          java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3601                          java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3602     seed += (jlong)VM_Version::vm_major_version();
3603     seed += (jlong)VM_Version::vm_minor_version();
3604     seed += (jlong)VM_Version::vm_security_version();
3605     seed += (jlong)VM_Version::vm_patch_version();
3606     if (seed == 0) { // don't let this ever be zero.
3607       seed = 0x87654321;
3608     }
3609     log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3610     return seed;
3611   } else {
3612     return 0;
3613   }
3614 JVM_END
3615 
3616 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3617   return CDSConfig::get_status();
3618 JVM_END
3619 
3620 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3621 #if INCLUDE_CDS
3622   assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3623   if (line != nullptr) {
3624     ResourceMark rm(THREAD);
3625     Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3626     char* c_line = java_lang_String::as_utf8_string(h_line());
3627     if (CDSConfig::is_dumping_dynamic_archive()) {
3628       // Note: LambdaFormInvokers::append take same format which is not
3629       // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3630       LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3631     }
3632     if (ClassListWriter::is_enabled()) {
3633       ClassListWriter w;
3634       w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3635     }
3636   }
3637 #endif // INCLUDE_CDS
3638 JVM_END
3639 
3640 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3641 #if INCLUDE_CDS
3642   ResourceMark rm(THREAD);
3643   Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3644   char* file_name  = java_lang_String::as_utf8_string(file_handle());
3645   AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3646 #endif // INCLUDE_CDS
3647 JVM_END
3648 
3649 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3650 #if INCLUDE_CDS
3651   ResourceMark rm(THREAD);
3652   Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3653   char* archive_name  = java_lang_String::as_utf8_string(file_handle());
3654   DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3655 #endif // INCLUDE_CDS
3656 JVM_END
3657 
3658 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3659 #if INCLUDE_CDS
3660   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3661   if (!k->is_instance_klass()) {
3662     return false;
3663   } else {
3664     if (InstanceKlass::cast(k)->is_enum_subclass() ||
3665         AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3666       // This class will be cached in AOT-initialized state. No need for init barriers.
3667       return false;
3668     } else {
3669       // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3670       // must emit barriers to ensure class initialization during production run.
3671       ResourceMark rm(THREAD);
3672       log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3673       return true;
3674     }
3675   }
3676 #else
3677   return false;
3678 #endif // INCLUDE_CDS
3679 JVM_END
3680 
3681 // Returns an array of all live Thread objects (VM internal JavaThreads,
3682 // jvmti agent threads, and JNI attaching threads  are skipped)
3683 // See CR 6404306 regarding JNI attaching threads
3684 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3685   ResourceMark rm(THREAD);
3686   ThreadsListEnumerator tle(THREAD, false, false);
3687   JvmtiVMObjectAllocEventCollector oam;
3688 
3689   int num_threads = tle.num_threads();
3690   objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3691   objArrayHandle threads_ah(THREAD, r);
3692 
3693   for (int i = 0; i < num_threads; i++) {
3694     Handle h = tle.get_threadObj(i);
3695     threads_ah->obj_at_put(i, h());
3696   }
3697 
3698   return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3699 JVM_END
3700 
3701 
3702 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3703 // Return StackTraceElement[][], each element is the stack trace of a thread in
3704 // the corresponding entry in the given threads array
3705 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3706   JvmtiVMObjectAllocEventCollector oam;
3707 
3708   // Check if threads is null
3709   if (threads == nullptr) {
3710     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3711   }
3712 
3713   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3714   objArrayHandle ah(THREAD, a);
3715   int num_threads = ah->length();
3716   // check if threads is non-empty array
3717   if (num_threads == 0) {
3718     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3719   }
3720 
3721   // check if threads is not an array of objects of Thread class
3722   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3723   if (k != vmClasses::Thread_klass()) {
3724     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3725   }
3726   refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3727 
3728   ResourceMark rm(THREAD);
3729 
3730   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3731   for (int i = 0; i < num_threads; i++) {
3732     oop thread_obj = rah->obj_at(i);
3733     instanceHandle h(THREAD, (instanceOop) thread_obj);
3734     thread_handle_array->append(h);
3735   }
3736 
3737   // The JavaThread references in thread_handle_array are validated
3738   // in VM_ThreadDump::doit().
3739   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3740   return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3741 
3742 JVM_END
3743 
3744 // JVM monitoring and management support
3745 JVM_LEAF(void*, JVM_GetManagement(jint version))
3746   return Management::get_jmm_interface(version);
3747 JVM_END
3748 
3749 // com.sun.tools.attach.VirtualMachine agent properties support
3750 //
3751 // Initialize the agent properties with the properties maintained in the VM
3752 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3753   ResourceMark rm;
3754 
3755   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3756 
3757   PUTPROP(props, "sun.java.command", Arguments::java_command());
3758   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3759   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3760   return properties;
3761 JVM_END
3762 
3763 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3764 {
3765   JvmtiVMObjectAllocEventCollector oam;
3766 
3767   if (ofClass == nullptr) {
3768     return nullptr;
3769   }
3770   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3771   // Special handling for primitive objects
3772   if (java_lang_Class::is_primitive(mirror())) {
3773     return nullptr;
3774   }
3775   Klass* k = java_lang_Class::as_Klass(mirror());
3776   if (!k->is_instance_klass()) {
3777     return nullptr;
3778   }
3779   InstanceKlass* ik = InstanceKlass::cast(k);
3780   int encl_method_class_idx = ik->enclosing_method_class_index();
3781   if (encl_method_class_idx == 0) {
3782     return nullptr;
3783   }
3784   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3785   objArrayHandle dest(THREAD, dest_o);
3786   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3787   dest->obj_at_put(0, enc_k->java_mirror());
3788   int encl_method_method_idx = ik->enclosing_method_method_index();
3789   if (encl_method_method_idx != 0) {
3790     Symbol* sym = ik->constants()->symbol_at(
3791                         extract_low_short_from_int(
3792                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3793     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3794     dest->obj_at_put(1, str());
3795     sym = ik->constants()->symbol_at(
3796               extract_high_short_from_int(
3797                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3798     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3799     dest->obj_at_put(2, str());
3800   }
3801   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3802 }
3803 JVM_END
3804 
3805 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3806 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3807   ResourceMark rm(THREAD);
3808 
3809   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3810     return nullptr;
3811   }
3812 
3813   char** vm_flags = Arguments::jvm_flags_array();
3814   char** vm_args = Arguments::jvm_args_array();
3815   int num_flags = Arguments::num_jvm_flags();
3816   int num_args = Arguments::num_jvm_args();
3817 
3818   InstanceKlass* ik = vmClasses::String_klass();
3819   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3820   objArrayHandle result_h(THREAD, r);
3821 
3822   int index = 0;
3823   for (int j = 0; j < num_flags; j++, index++) {
3824     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3825     result_h->obj_at_put(index, h());
3826   }
3827   for (int i = 0; i < num_args; i++, index++) {
3828     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3829     result_h->obj_at_put(index, h());
3830   }
3831   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3832 JVM_END
3833 
3834 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3835   return os::get_signal_number(name);
3836 JVM_END
3837 
3838 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread))
3839   oop vt = JNIHandles::resolve_external_guard(vthread);
3840   MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/);
3841 JVM_END
3842 
3843 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread))
3844   oop vt = JNIHandles::resolve_external_guard(vthread);
3845   MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/);
3846 JVM_END
3847 
3848 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3849   oop vt = JNIHandles::resolve_external_guard(vthread);
3850   MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/);
3851 JVM_END
3852 
3853 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3854   oop vt = JNIHandles::resolve_external_guard(vthread);
3855   MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/);
3856 JVM_END
3857 
3858 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3859 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3860 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3861 #if INCLUDE_JVMTI
3862   if (!DoJVMTIVirtualThreadTransitions) {
3863     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3864     return;
3865   }
3866   assert(thread->is_disable_suspend() != (bool)enter,
3867          "nested or unbalanced monitor enter/exit is not allowed");
3868   thread->toggle_is_disable_suspend();
3869 #endif
3870 JVM_END
3871 
3872 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3873 #if INCLUDE_JFR
3874   freeze_result result = THREAD->last_freeze_fail_result();
3875   assert(result != freeze_ok, "sanity check");
3876   EventVirtualThreadPinned event(UNTIMED);
3877   event.set_starttime(THREAD->last_freeze_fail_time());
3878   if (event.should_commit()) {
3879     ResourceMark rm(THREAD);
3880     const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3881     THREAD->post_vthread_pinned_event(&event, str, result);
3882   }
3883 #endif
3884 JVM_END
3885 
3886 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3887   ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3888   assert(parkEvent != nullptr, "not initialized");
3889 
3890   OopHandle& list_head = ObjectMonitor::vthread_list_head();
3891   oop vthread_head = nullptr;
3892   while (true) {
3893     if (list_head.peek() != nullptr) {
3894       for (;;) {
3895         oop head = list_head.resolve();
3896         if (list_head.cmpxchg(head, nullptr) == head) {
3897           return JNIHandles::make_local(THREAD, head);
3898         }
3899       }
3900     }
3901     ThreadBlockInVM tbivm(THREAD);
3902     parkEvent->park();
3903   }
3904 JVM_END
3905 
3906 /*
3907  * Return the current class's class file version.  The low order 16 bits of the
3908  * returned jint contain the class's major version.  The high order 16 bits
3909  * contain the class's minor version.
3910  */
3911 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3912   oop mirror = JNIHandles::resolve_non_null(current);
3913   if (java_lang_Class::is_primitive(mirror)) {
3914     // return latest major version and minor version of 0.
3915     return JVM_CLASSFILE_MAJOR_VERSION;
3916   }
3917   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3918   return (ik->minor_version() << 16) | ik->major_version();
3919 JVM_END
3920 
3921 /*
3922  * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3923  * get the value will see a materialized value and not a scalar-replaced
3924  * null value.
3925  */
3926 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3927   JVM_EnsureMaterializedForStackWalk(env, value);
3928 JVM_END
3929 
3930 /*
3931  * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3932  */
3933 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3934   return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3935 JVM_END
--- EOF ---