1 /*
   2  * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "cds/aotClassInitializer.hpp"
  26 #include "cds/aotMetaspace.hpp"
  27 #include "cds/cdsConfig.hpp"
  28 #include "cds/classListParser.hpp"
  29 #include "cds/classListWriter.hpp"
  30 #include "cds/dynamicArchive.hpp"
  31 #include "cds/heapShared.hpp"
  32 #include "cds/lambdaFormInvokers.hpp"
  33 #include "cds/lambdaProxyClassDictionary.hpp"
  34 #include "classfile/classFileStream.hpp"
  35 #include "classfile/classLoader.inline.hpp"
  36 #include "classfile/classLoaderData.inline.hpp"
  37 #include "classfile/classLoadInfo.hpp"
  38 #include "classfile/javaAssertions.hpp"
  39 #include "classfile/javaClasses.inline.hpp"
  40 #include "classfile/moduleEntry.hpp"
  41 #include "classfile/modules.hpp"
  42 #include "classfile/packageEntry.hpp"
  43 #include "classfile/stringTable.hpp"
  44 #include "classfile/symbolTable.hpp"
  45 #include "classfile/systemDictionary.hpp"
  46 #include "classfile/vmClasses.hpp"
  47 #include "classfile/vmSymbols.hpp"
  48 #include "gc/shared/collectedHeap.inline.hpp"
  49 #include "interpreter/bytecode.hpp"
  50 #include "interpreter/bytecodeUtils.hpp"
  51 #include "jfr/jfrEvents.hpp"
  52 #include "jvm.h"
  53 #include "logging/log.hpp"
  54 #include "memory/oopFactory.hpp"
  55 #include "memory/referenceType.hpp"
  56 #include "memory/resourceArea.hpp"
  57 #include "memory/universe.hpp"
  58 #include "oops/access.inline.hpp"
  59 #include "oops/constantPool.hpp"
  60 #include "oops/fieldStreams.inline.hpp"
  61 #include "oops/flatArrayKlass.hpp"
  62 #include "oops/instanceKlass.hpp"
  63 #include "oops/klass.inline.hpp"
  64 #include "oops/method.hpp"
  65 #include "oops/objArrayKlass.hpp"
  66 #include "oops/objArrayOop.inline.hpp"
  67 #include "oops/oop.inline.hpp"
  68 #include "oops/recordComponent.hpp"
  69 #include "oops/refArrayOop.inline.hpp"
  70 #include "prims/foreignGlobals.hpp"
  71 #include "prims/jvm_misc.hpp"
  72 #include "prims/jvmtiExport.hpp"
  73 #include "prims/jvmtiThreadState.inline.hpp"
  74 #include "prims/stackwalk.hpp"
  75 #include "runtime/arguments.hpp"
  76 #include "runtime/atomicAccess.hpp"
  77 #include "runtime/continuation.hpp"
  78 #include "runtime/deoptimization.hpp"
  79 #include "runtime/globals_extension.hpp"
  80 #include "runtime/handles.inline.hpp"
  81 #include "runtime/handshake.hpp"
  82 #include "runtime/init.hpp"
  83 #include "runtime/interfaceSupport.inline.hpp"
  84 #include "runtime/java.hpp"
  85 #include "runtime/javaCalls.hpp"
  86 #include "runtime/javaThread.hpp"
  87 #include "runtime/jfieldIDWorkaround.hpp"
  88 #include "runtime/jniHandles.inline.hpp"
  89 #include "runtime/os.inline.hpp"
  90 #include "runtime/osThread.hpp"
  91 #include "runtime/perfData.hpp"
  92 #include "runtime/reflection.hpp"
  93 #include "runtime/synchronizer.hpp"
  94 #include "runtime/threadIdentifier.hpp"
  95 #include "runtime/threadSMR.hpp"
  96 #include "runtime/vframe.inline.hpp"
  97 #include "runtime/vm_version.hpp"
  98 #include "runtime/vmOperations.hpp"
  99 #include "services/attachListener.hpp"
 100 #include "services/management.hpp"
 101 #include "services/threadService.hpp"
 102 #include "utilities/checkedCast.hpp"
 103 #include "utilities/copy.hpp"
 104 #include "utilities/defaultStream.hpp"
 105 #include "utilities/dtrace.hpp"
 106 #include "utilities/events.hpp"
 107 #include "utilities/macros.hpp"
 108 #include "utilities/utf8.hpp"
 109 #include "utilities/zipLibrary.hpp"
 110 #if INCLUDE_CDS
 111 #include "classfile/systemDictionaryShared.hpp"
 112 #endif
 113 #if INCLUDE_JFR
 114 #include "jfr/jfr.hpp"
 115 #endif
 116 #if INCLUDE_MANAGEMENT
 117 #include "services/finalizerService.hpp"
 118 #endif
 119 #ifdef LINUX
 120 #include "osContainer_linux.hpp"
 121 #endif
 122 
 123 #include <errno.h>
 124 
 125 /*
 126   NOTE about use of any ctor or function call that can trigger a safepoint/GC:
 127   such ctors and calls MUST NOT come between an oop declaration/init and its
 128   usage because if objects are move this may cause various memory stomps, bus
 129   errors and segfaults. Here is a cookbook for causing so called "naked oop
 130   failures":
 131 
 132       JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
 133           // Object address to be held directly in mirror & not visible to GC
 134           oop mirror = JNIHandles::resolve_non_null(ofClass);
 135 
 136           // If this ctor can hit a safepoint, moving objects around, then
 137           ComplexConstructor foo;
 138 
 139           // Boom! mirror may point to JUNK instead of the intended object
 140           (some dereference of mirror)
 141 
 142           // Here's another call that may block for GC, making mirror stale
 143           MutexLocker ml(some_lock);
 144 
 145           // And here's an initializer that can result in a stale oop
 146           // all in one step.
 147           oop o = call_that_can_throw_exception(TRAPS);
 148 
 149 
 150   The solution is to keep the oop declaration BELOW the ctor or function
 151   call that might cause a GC, do another resolve to reassign the oop, or
 152   consider use of a Handle instead of an oop so there is immunity from object
 153   motion. But note that the "QUICK" entries below do not have a handlemark
 154   and thus can only support use of handles passed in.
 155 */
 156 
 157 extern void trace_class_resolution(Klass* to_class) {
 158   ResourceMark rm;
 159   int line_number = -1;
 160   const char * source_file = nullptr;
 161   const char * trace = "explicit";
 162   InstanceKlass* caller = nullptr;
 163   JavaThread* jthread = JavaThread::current();
 164   if (jthread->has_last_Java_frame()) {
 165     vframeStream vfst(jthread);
 166 
 167     // Scan up the stack skipping ClassLoader frames.
 168     Method* last_caller = nullptr;
 169 
 170     while (!vfst.at_end()) {
 171       Method* m = vfst.method();
 172       if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
 173         break;
 174       }
 175       last_caller = m;
 176       vfst.next();
 177     }
 178     // if this is called from Class.forName0 and that is called from Class.forName,
 179     // then print the caller of Class.forName.  If this is Class.loadClass, then print
 180     // that caller, otherwise keep quiet since this should be picked up elsewhere.
 181     bool found_it = false;
 182     if (!vfst.at_end() &&
 183         vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 184         vfst.method()->name() == vmSymbols::forName0_name()) {
 185       vfst.next();
 186       if (!vfst.at_end() &&
 187           vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 188           vfst.method()->name() == vmSymbols::forName_name()) {
 189         vfst.next();
 190         found_it = true;
 191       }
 192     } else if (last_caller != nullptr &&
 193                last_caller->method_holder()->name() ==
 194                  vmSymbols::java_lang_ClassLoader() &&
 195                last_caller->name() == vmSymbols::loadClass_name()) {
 196       found_it = true;
 197     } else if (!vfst.at_end()) {
 198       if (vfst.method()->is_native()) {
 199         // JNI call
 200         found_it = true;
 201       }
 202     }
 203     if (found_it && !vfst.at_end()) {
 204       // found the caller
 205       caller = vfst.method()->method_holder();
 206       line_number = vfst.method()->line_number_from_bci(vfst.bci());
 207       if (line_number == -1) {
 208         // show method name if it's a native method
 209         trace = vfst.method()->name_and_sig_as_C_string();
 210       }
 211       Symbol* s = caller->source_file_name();
 212       if (s != nullptr) {
 213         source_file = s->as_C_string();
 214       }
 215     }
 216   }
 217   if (caller != nullptr) {
 218     if (to_class != caller) {
 219       const char * from = caller->external_name();
 220       const char * to = to_class->external_name();
 221       // print in a single call to reduce interleaving between threads
 222       if (source_file != nullptr) {
 223         log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
 224       } else {
 225         log_debug(class, resolve)("%s %s (%s)", from, to, trace);
 226       }
 227     }
 228   }
 229 }
 230 
 231 // java.lang.System //////////////////////////////////////////////////////////////////////
 232 
 233 
 234 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
 235   return os::javaTimeMillis();
 236 JVM_END
 237 
 238 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
 239   return os::javaTimeNanos();
 240 JVM_END
 241 
 242 // The function below is actually exposed by jdk.internal.misc.VM and not
 243 // java.lang.System, but we choose to keep it here so that it stays next
 244 // to JVM_CurrentTimeMillis and JVM_NanoTime
 245 
 246 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); //  2^32
 247 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
 248 
 249 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
 250   jlong seconds;
 251   jlong nanos;
 252 
 253   os::javaTimeSystemUTC(seconds, nanos);
 254 
 255   // We're going to verify that the result can fit in a long.
 256   // For that we need the difference in seconds between 'seconds'
 257   // and 'offset_secs' to be such that:
 258   //     |seconds - offset_secs| < (2^63/10^9)
 259   // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
 260   // which makes |seconds - offset_secs| < 2^33
 261   // and we will prefer +/- 2^32 as the maximum acceptable diff
 262   // as 2^32 has a more natural feel than 2^33...
 263   //
 264   // So if |seconds - offset_secs| >= 2^32 - we return a special
 265   // sentinel value (-1) which the caller should take as an
 266   // exception value indicating that the offset given to us is
 267   // too far from range of the current time - leading to too big
 268   // a nano adjustment. The caller is expected to recover by
 269   // computing a more accurate offset and calling this method
 270   // again. (For the record 2^32 secs is ~136 years, so that
 271   // should rarely happen)
 272   //
 273   jlong diff = seconds - offset_secs;
 274   if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
 275      return -1; // sentinel value: the offset is too far off the target
 276   }
 277 
 278   // return the adjustment. If you compute a time by adding
 279   // this number of nanoseconds along with the number of seconds
 280   // in the offset you should get the current UTC time.
 281   return (diff * (jlong)1000000000) + nanos;
 282 JVM_END
 283 
 284 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
 285                                jobject dst, jint dst_pos, jint length))
 286   // Check if we have null pointers
 287   if (src == nullptr || dst == nullptr) {
 288     THROW(vmSymbols::java_lang_NullPointerException());
 289   }
 290   arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
 291   arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
 292   assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
 293   assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
 294   // Do copy
 295   s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
 296 JVM_END
 297 
 298 
 299 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
 300   JavaValue r(T_OBJECT);
 301   // public synchronized Object put(Object key, Object value);
 302   HandleMark hm(THREAD);
 303   Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK);
 304   Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
 305   JavaCalls::call_virtual(&r,
 306                           props,
 307                           vmClasses::Properties_klass(),
 308                           vmSymbols::put_name(),
 309                           vmSymbols::object_object_object_signature(),
 310                           key_str,
 311                           value_str,
 312                           THREAD);
 313 }
 314 
 315 
 316 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
 317 
 318 /*
 319  * Return all of the system properties in a Java String array with alternating
 320  * names and values from the jvm SystemProperty.
 321  * Which includes some internal and all commandline -D defined properties.
 322  */
 323 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
 324   ResourceMark rm(THREAD);
 325   HandleMark hm(THREAD);
 326   int ndx = 0;
 327   int fixedCount = 2;
 328 
 329   SystemProperty* p = Arguments::system_properties();
 330   int count = Arguments::PropertyList_count(p);
 331 
 332   // Allocate result String array
 333   InstanceKlass* ik = vmClasses::String_klass();
 334   objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
 335   objArrayHandle result_h(THREAD, r);
 336 
 337   while (p != nullptr) {
 338     const char * key = p->key();
 339     if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
 340         const char * value = p->value();
 341         Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
 342         Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
 343         result_h->obj_at_put(ndx * 2,  key_str());
 344         result_h->obj_at_put(ndx * 2 + 1, value_str());
 345         ndx++;
 346     }
 347     p = p->next();
 348   }
 349 
 350   // Convert the -XX:MaxDirectMemorySize= command line flag
 351   // to the sun.nio.MaxDirectMemorySize property.
 352   // Do this after setting user properties to prevent people
 353   // from setting the value with a -D option, as requested.
 354   // Leave empty if not supplied
 355   if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
 356     char as_chars[256];
 357     jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
 358     Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
 359     Handle value_str  = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
 360     result_h->obj_at_put(ndx * 2,  key_str());
 361     result_h->obj_at_put(ndx * 2 + 1, value_str());
 362     ndx++;
 363   }
 364 
 365   // JVM monitoring and management support
 366   // Add the sun.management.compiler property for the compiler's name
 367   {
 368 #undef CSIZE
 369 #if defined(_LP64)
 370   #define CSIZE "64-Bit "
 371 #else
 372   #define CSIZE
 373 #endif // 64bit
 374 
 375 #if COMPILER1_AND_COMPILER2
 376     const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
 377 #else
 378 #if defined(COMPILER1)
 379     const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
 380 #elif defined(COMPILER2)
 381     const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
 382 #elif INCLUDE_JVMCI
 383     #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
 384 #else
 385     const char* compiler_name = "";
 386 #endif // compilers
 387 #endif // COMPILER1_AND_COMPILER2
 388 
 389     if (*compiler_name != '\0' &&
 390         (Arguments::mode() != Arguments::_int)) {
 391       Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
 392       Handle value_str  = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
 393       result_h->obj_at_put(ndx * 2,  key_str());
 394       result_h->obj_at_put(ndx * 2 + 1, value_str());
 395       ndx++;
 396     }
 397   }
 398 
 399   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
 400 JVM_END
 401 
 402 
 403 /*
 404  * Return the temporary directory that the VM uses for the attach
 405  * and perf data files.
 406  *
 407  * It is important that this directory is well-known and the
 408  * same for all VM instances. It cannot be affected by configuration
 409  * variables such as java.io.tmpdir.
 410  */
 411 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 412   HandleMark hm(THREAD);
 413   const char* temp_dir = os::get_temp_directory();
 414   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 415   return (jstring) JNIHandles::make_local(THREAD, h());
 416 JVM_END
 417 
 418 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
 419   if (len < 0) {
 420     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
 421   }
 422   elmClass->initialize(CHECK);
 423   if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
 424     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
 425   }
 426   if (elmClass->is_abstract()) {
 427     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
 428   }
 429 }
 430 
 431 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
 432   oop o = JNIHandles::resolve_non_null(orig);
 433   assert(o->is_array(), "Must be");
 434   oop array = nullptr;
 435   arrayOop org = (arrayOop)o;
 436   arrayHandle oh(THREAD, org);
 437   ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
 438   InlineKlass* vk = InlineKlass::cast(ak->element_klass());
 439   int len = to - from;  // length of the new array
 440   if (ak->is_null_free_array_klass()) {
 441     if ((len != 0) && (from >= org->length() || to > org->length())) {
 442       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
 443     }
 444   }
 445   if (org->is_flatArray()) {
 446     FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
 447     LayoutKind lk = fak->layout_kind();
 448     ArrayKlass::ArrayProperties props = ArrayKlass::array_properties_from_layout(lk);
 449     array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
 450     arrayHandle ah(THREAD, (arrayOop)array);
 451     int end = to < oh()->length() ? to : oh()->length();
 452     for (int i = from; i < end; i++) {
 453       void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
 454       void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
 455       vk->copy_payload_to_addr(src, dst, lk, false);
 456     }
 457     array = ah();
 458   } else {
 459     ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
 460     array = oopFactory::new_objArray(vk, len, props,  CHECK_NULL);
 461     int end = to < oh()->length() ? to : oh()->length();
 462     for (int i = from; i < end; i++) {
 463       if (i < ((objArrayOop)oh())->length()) {
 464         ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
 465       } else {
 466         assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
 467         ((objArrayOop)array)->obj_at_put(i - from, nullptr);
 468       }
 469     }
 470   }
 471   return (jarray) JNIHandles::make_local(THREAD, array);
 472 JVM_END
 473 
 474 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
 475   oop mirror = JNIHandles::resolve_non_null(elmClass);
 476   oop init = JNIHandles::resolve(initVal);
 477   if (init == nullptr) {
 478     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
 479   }
 480   Handle init_h(THREAD, init);
 481   Klass* klass = java_lang_Class::as_Klass(mirror);
 482   if (klass != init_h()->klass()) {
 483     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
 484   }
 485   validate_array_arguments(klass, len, CHECK_NULL);
 486   InlineKlass* vk = InlineKlass::cast(klass);
 487   ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
 488   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 489   for (int i = 0; i < len; i++) {
 490     array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
 491   }
 492   return (jarray) JNIHandles::make_local(THREAD, array);
 493 JVM_END
 494 
 495 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
 496   oop mirror = JNIHandles::resolve_non_null(elmClass);
 497   oop init = JNIHandles::resolve(initVal);
 498   if (init == nullptr) {
 499     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
 500   }
 501   Handle init_h(THREAD, init);
 502   Klass* klass = java_lang_Class::as_Klass(mirror);
 503   if (klass != init_h()->klass()) {
 504     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
 505   }
 506   validate_array_arguments(klass, len, CHECK_NULL);
 507   InlineKlass* vk = InlineKlass::cast(klass);
 508   ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
 509   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 510   for (int i = 0; i < len; i++) {
 511     array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
 512   }
 513   return (jarray) JNIHandles::make_local(THREAD, array);
 514 JVM_END
 515 
 516 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
 517   oop mirror = JNIHandles::resolve_non_null(elmClass);
 518   Klass* klass = java_lang_Class::as_Klass(mirror);
 519   klass->initialize(CHECK_NULL);
 520   validate_array_arguments(klass, len, CHECK_NULL);
 521   InlineKlass* vk = InlineKlass::cast(klass);
 522   ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
 523   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 524   return (jarray) JNIHandles::make_local(THREAD, array);
 525 JVM_END
 526 
 527 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
 528   arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
 529   return oop->is_flatArray();
 530 JVM_END
 531 
 532 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
 533   arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
 534   return oop->is_null_free_array();
 535 JVM_END
 536 
 537 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
 538   // There are multiple cases where an array can/must support atomic access:
 539   //   - the array is a reference array
 540   //   - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
 541   //   - the array is flat and its component type is naturally atomic
 542   arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
 543   if (oop->is_refArray()) return true;
 544   if (oop->is_flatArray()) {
 545     FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
 546     if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) return true;
 547     if (fak->element_klass()->is_naturally_atomic()) return true;
 548   }
 549   return false;
 550 JVM_END
 551 
 552 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 553 
 554 extern volatile jint vm_created;
 555 
 556 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
 557   EventShutdown event;
 558   if (event.should_commit()) {
 559     event.set_reason("Shutdown requested from Java");
 560     event.commit();
 561   }
 562 JVM_END
 563 
 564 
 565 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 566   before_exit(thread, true);
 567   vm_exit(code);
 568 JVM_END
 569 
 570 
 571 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 572   if (!DisableExplicitGC) {
 573     EventSystemGC event;
 574     event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
 575     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 576     event.commit();
 577   }
 578 JVM_END
 579 
 580 
 581 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 582   return Universe::heap()->millis_since_last_whole_heap_examined();
 583 JVM_END
 584 
 585 
 586 static inline jlong convert_size_t_to_jlong(size_t val) {
 587   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 588   NOT_LP64 (return (jlong)val;)
 589   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 590 }
 591 
 592 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 593   size_t n = Universe::heap()->capacity();
 594   return convert_size_t_to_jlong(n);
 595 JVM_END
 596 
 597 
 598 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 599   size_t n = Universe::heap()->unused();
 600   return convert_size_t_to_jlong(n);
 601 JVM_END
 602 
 603 
 604 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 605   size_t n = Universe::heap()->max_capacity();
 606   return convert_size_t_to_jlong(n);
 607 JVM_END
 608 
 609 
 610 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 611   return os::active_processor_count();
 612 JVM_END
 613 
 614 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
 615 #ifdef LINUX
 616   if (UseContainerSupport) {
 617     return JNI_TRUE;
 618   }
 619 #endif
 620   return JNI_FALSE;
 621 JVM_END
 622 
 623 JVM_LEAF(jboolean, JVM_IsContainerized(void))
 624 #ifdef LINUX
 625   if (OSContainer::is_containerized()) {
 626     return JNI_TRUE;
 627   }
 628 #endif
 629   return JNI_FALSE;
 630 JVM_END
 631 
 632 // java.lang.Throwable //////////////////////////////////////////////////////
 633 
 634 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 635   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 636   java_lang_Throwable::fill_in_stack_trace(exception);
 637 JVM_END
 638 
 639 // java.lang.NullPointerException ///////////////////////////////////////////
 640 
 641 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
 642   if (!ShowCodeDetailsInExceptionMessages) return nullptr;
 643 
 644   oop exc = JNIHandles::resolve_non_null(throwable);
 645 
 646   Method* method;
 647   int bci;
 648   if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
 649     return nullptr;
 650   }
 651   if (method->is_native()) {
 652     return nullptr;
 653   }
 654 
 655   stringStream ss;
 656   bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
 657   if (ok) {
 658     oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
 659     return (jstring) JNIHandles::make_local(THREAD, result);
 660   } else {
 661     return nullptr;
 662   }
 663 JVM_END
 664 
 665 // java.lang.StackTraceElement //////////////////////////////////////////////
 666 
 667 
 668 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
 669   Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
 670   objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
 671   objArrayHandle stack_trace(THREAD, st);
 672   // Fill in the allocated stack trace
 673   java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
 674 JVM_END
 675 
 676 
 677 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 678   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 679   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 680   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
 681 JVM_END
 682 
 683 
 684 // java.lang.StackWalker //////////////////////////////////////////////////////
 685 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
 686   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
 687 
 688   bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
 689   bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
 690   Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
 691   if (!have_name) {
 692     oop name = StringTable::intern(method->name(), CHECK);
 693     java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
 694   }
 695   if (!have_type) {
 696     Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
 697     java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
 698   }
 699 JVM_END
 700 
 701 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
 702                                      jint skip_frames, jobject contScope, jobject cont,
 703                                      jint buffer_size, jint start_index, jobjectArray frames))
 704   if (!thread->has_last_Java_frame()) {
 705     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
 706   }
 707 
 708   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 709   Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
 710   Handle cont_h(THREAD, JNIHandles::resolve(cont));
 711   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 712   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 713   // be null.
 714   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 715   objArrayHandle frames_array_h(THREAD, fa);
 716 
 717   if (frames_array_h->length() < buffer_size) {
 718     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
 719   }
 720 
 721   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
 722                                buffer_size, start_index, frames_array_h, CHECK_NULL);
 723   return JNIHandles::make_local(THREAD, result);
 724 JVM_END
 725 
 726 
 727 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
 728                                   jint last_batch_count, jint buffer_size, jint start_index,
 729                                   jobjectArray frames))
 730   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 731   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 732   // be null.
 733   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 734   objArrayHandle frames_array_h(THREAD, fa);
 735 
 736   if (frames_array_h->length() < buffer_size) {
 737     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 738   }
 739 
 740   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 741   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
 742                                   start_index, frames_array_h, THREAD);
 743 JVM_END
 744 
 745 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
 746   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 747   objArrayHandle frames_array_h(THREAD, fa);
 748   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 749   Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
 750 
 751   StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
 752 JVM_END
 753 
 754 // java.lang.Object ///////////////////////////////////////////////
 755 
 756 
 757 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 758   // as implemented in the classic virtual machine; return 0 if object is null
 759   if (handle == nullptr) {
 760     return 0;
 761   }
 762   oop obj = JNIHandles::resolve_non_null(handle);
 763   if (EnableValhalla && obj->klass()->is_inline_klass()) {
 764       JavaValue result(T_INT);
 765       JavaCallArguments args;
 766       Handle ho(THREAD, obj);
 767       args.push_oop(ho);
 768       methodHandle method(THREAD, UseAltSubstitutabilityMethod
 769               ? Universe::value_object_hash_codeAlt_method() : Universe::value_object_hash_code_method());
 770       JavaCalls::call(&result, method, &args, THREAD);
 771       if (HAS_PENDING_EXCEPTION) {
 772         if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
 773           Handle e(THREAD, PENDING_EXCEPTION);
 774           CLEAR_PENDING_EXCEPTION;
 775           THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
 776         }
 777       }
 778       return result.get_jint();
 779   } else {
 780     return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
 781   }
 782 JVM_END
 783 
 784 
 785 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 786   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 787   ObjectSynchronizer::wait(obj, ms, CHECK);
 788 JVM_END
 789 
 790 
 791 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 792   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 793   ObjectSynchronizer::notify(obj, CHECK);
 794 JVM_END
 795 
 796 
 797 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 798   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 799   ObjectSynchronizer::notifyall(obj, CHECK);
 800 JVM_END
 801 
 802 
 803 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 804   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 805   Klass* klass = obj->klass();
 806   JvmtiVMObjectAllocEventCollector oam;
 807 
 808 #ifdef ASSERT
 809   // Just checking that the cloneable flag is set correct
 810   if (obj->is_array()) {
 811     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 812   } else {
 813     guarantee(obj->is_instance(), "should be instanceOop");
 814     bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
 815     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 816   }
 817 #endif
 818 
 819   // Check if class of obj supports the Cloneable interface.
 820   // All arrays are considered to be cloneable (See JLS 20.1.5).
 821   // All j.l.r.Reference classes are considered non-cloneable.
 822   if (!klass->is_cloneable() ||
 823       (klass->is_instance_klass() &&
 824        InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
 825     ResourceMark rm(THREAD);
 826     THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 827   }
 828 
 829   if (klass->is_inline_klass()) {
 830     // Value instances have no identity, so return the current instance instead of allocating a new one
 831     // Value classes cannot have finalizers, so the method can return immediately
 832     return JNIHandles::make_local(THREAD, obj());
 833   }
 834 
 835   // Make shallow object copy
 836   const size_t size = obj->size();
 837   oop new_obj_oop = nullptr;
 838   if (obj->is_array()) {
 839     const int length = ((arrayOop)obj())->length();
 840     new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
 841                                                    /* do_zero */ true, CHECK_NULL);
 842   } else {
 843     new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
 844   }
 845 
 846   HeapAccess<>::clone(obj(), new_obj_oop, size);
 847 
 848   Handle new_obj(THREAD, new_obj_oop);
 849   // Caution: this involves a java upcall, so the clone should be
 850   // "gc-robust" by this stage.
 851   if (klass->has_finalizer()) {
 852     assert(obj->is_instance(), "should be instanceOop");
 853     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 854     new_obj = Handle(THREAD, new_obj_oop);
 855   }
 856 
 857   return JNIHandles::make_local(THREAD, new_obj());
 858 JVM_END
 859 
 860 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
 861 
 862 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
 863   MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
 864 JVM_END
 865 
 866 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
 867   return InstanceKlass::is_finalization_enabled();
 868 JVM_END
 869 
 870 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
 871 
 872 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
 873   CONT_RegisterNativeMethods(env, cls);
 874 JVM_END
 875 
 876 // java.io.File ///////////////////////////////////////////////////////////////
 877 
 878 JVM_LEAF(char*, JVM_NativePath(char* path))
 879   return os::native_path(path);
 880 JVM_END
 881 
 882 
 883 // Misc. class handling ///////////////////////////////////////////////////////////
 884 
 885 
 886 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
 887   // Getting the class of the caller frame.
 888   //
 889   // The call stack at this point looks something like this:
 890   //
 891   // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
 892   // [1] [ @CallerSensitive API.method                                   ]
 893   // [.] [ (skipped intermediate frames)                                 ]
 894   // [n] [ caller                                                        ]
 895   vframeStream vfst(thread);
 896   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 897   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 898     Method* m = vfst.method();
 899     assert(m != nullptr, "sanity");
 900     switch (n) {
 901     case 0:
 902       // This must only be called from Reflection.getCallerClass
 903       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 904         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 905       }
 906       // fall-through
 907     case 1:
 908       // Frame 0 and 1 must be caller sensitive.
 909       if (!m->caller_sensitive()) {
 910         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 911       }
 912       break;
 913     default:
 914       if (!m->is_ignored_by_security_stack_walk()) {
 915         // We have reached the desired frame; return the holder class.
 916         return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
 917       }
 918       break;
 919     }
 920   }
 921   return nullptr;
 922 JVM_END
 923 
 924 
 925 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 926   oop mirror = nullptr;
 927   BasicType t = name2type(utf);
 928   if (t != T_ILLEGAL && !is_reference_type(t)) {
 929     mirror = Universe::java_mirror(t);
 930   }
 931   if (mirror == nullptr) {
 932     THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 933   } else {
 934     return (jclass) JNIHandles::make_local(THREAD, mirror);
 935   }
 936 JVM_END
 937 
 938 
 939 // Returns a class loaded by the bootstrap class loader; or null
 940 // if not found.  ClassNotFoundException is not thrown.
 941 // FindClassFromBootLoader is exported to the launcher for windows.
 942 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 943                                               const char* name))
 944   // Java libraries should ensure that name is never null or illegal.
 945   if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
 946     // It's impossible to create this class;  the name cannot fit
 947     // into the constant pool.
 948     return nullptr;
 949   }
 950   assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
 951 
 952   TempNewSymbol h_name = SymbolTable::new_symbol(name);
 953   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 954   if (k == nullptr) {
 955     return nullptr;
 956   }
 957 
 958   if (log_is_enabled(Debug, class, resolve)) {
 959     trace_class_resolution(k);
 960   }
 961   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
 962 JVM_END
 963 
 964 // Find a class with this name in this loader.
 965 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
 966                                           jboolean init, jobject loader))
 967   TempNewSymbol h_name =
 968        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 969                                            CHECK_NULL);
 970 
 971   oop loader_oop = JNIHandles::resolve(loader);
 972   Handle h_loader(THREAD, loader_oop);
 973 
 974   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 975                                                false, THREAD);
 976 
 977   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
 978     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 979   }
 980   return result;
 981 JVM_END
 982 
 983 // Currently only called from the old verifier.
 984 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 985                                          jboolean init, jclass from))
 986   TempNewSymbol h_name =
 987        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 988                                            CHECK_NULL);
 989   oop from_class_oop = JNIHandles::resolve(from);
 990   assert(from_class_oop != nullptr, "must be");
 991   Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
 992   assert(from_class != nullptr, "must be");
 993   oop class_loader = from_class->class_loader();
 994 
 995   Handle h_loader(THREAD, class_loader);
 996   jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
 997 
 998   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
 999     // this function is generally only used for class loading during verification.
1000     ResourceMark rm;
1001     const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1002     const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1003     log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1004   }
1005 
1006 #if INCLUDE_CDS
1007   if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1008     InstanceKlass* ik = InstanceKlass::cast(from_class);
1009     SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1010   }
1011 #endif
1012 
1013   return result;
1014 JVM_END
1015 
1016 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1017 static jclass jvm_define_class_common(const char *name,
1018                                       jobject loader, const jbyte *buf,
1019                                       jsize len, jobject pd, const char *source,
1020                                       TRAPS) {
1021   if (source == nullptr)  source = "__JVM_DefineClass__";
1022 
1023   JavaThread* jt = THREAD;
1024 
1025   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1026                              ClassLoader::perf_define_appclass_selftime(),
1027                              ClassLoader::perf_define_appclasses(),
1028                              jt->get_thread_stat()->perf_recursion_counts_addr(),
1029                              jt->get_thread_stat()->perf_timers_addr(),
1030                              PerfClassTraceTime::DEFINE_CLASS);
1031 
1032   if (UsePerfData) {
1033     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1034   }
1035 
1036   // Class resolution will get the class name from the .class stream if the name is null.
1037   TempNewSymbol class_name = name == nullptr ? nullptr :
1038        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1039                                            CHECK_NULL);
1040 
1041   ResourceMark rm(THREAD);
1042   ClassFileStream st((u1*)buf, len, source);
1043   Handle class_loader (THREAD, JNIHandles::resolve(loader));
1044   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1045   ClassLoadInfo cl_info(protection_domain);
1046   Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1047                                                    class_loader,
1048                                                    cl_info,
1049                                                    CHECK_NULL);
1050 
1051   if (log_is_enabled(Debug, class, resolve)) {
1052     trace_class_resolution(k);
1053   }
1054 
1055   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1056 }
1057 
1058 enum {
1059   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1060   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1061   STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1062   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1063 };
1064 
1065 /*
1066  * Define a class with the specified flags that indicates if it's a nestmate,
1067  * hidden, or strongly referenced from class loader.
1068  */
1069 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1070                                       const jbyte *buf, jsize len, jobject pd,
1071                                       jboolean init, int flags, jobject classData, TRAPS) {
1072   ResourceMark rm(THREAD);
1073 
1074   InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1075   // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1076   if (lookup_k == nullptr) {
1077     // The error message is wrong. We come here only if lookup is a primitive class
1078     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1079   }
1080 
1081   Handle class_loader (THREAD, lookup_k->class_loader());
1082 
1083   bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1084   bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1085   bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1086   bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1087 
1088   InstanceKlass* host_class = nullptr;
1089   if (is_nestmate) {
1090     host_class = lookup_k->nest_host(CHECK_NULL);
1091   }
1092 
1093   log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1094                              name,
1095                              is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1096                              is_nestmate ? host_class->external_name() : "",
1097                              is_hidden ? "hidden" : "not hidden",
1098                              is_strong ? "strong" : "weak",
1099                              vm_annotations ? "with vm annotations" : "without vm annotation");
1100 
1101   if (!is_hidden) {
1102     // classData is only applicable for hidden classes
1103     if (classData != nullptr) {
1104       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1105     }
1106     if (is_nestmate) {
1107       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1108     }
1109     if (!is_strong) {
1110       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1111     }
1112     if (vm_annotations) {
1113       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1114     }
1115     if (flags != STRONG_LOADER_LINK) {
1116       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1117                      err_msg("invalid flag 0x%x", flags));
1118     }
1119   }
1120 
1121   // Class resolution will get the class name from the .class stream if the name is null.
1122   TempNewSymbol class_name = name == nullptr ? nullptr :
1123        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1124                                            CHECK_NULL);
1125 
1126   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1127   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1128   ClassFileStream st((u1*)buf, len, source);
1129 
1130   InstanceKlass* ik = nullptr;
1131   if (!is_hidden) {
1132     ClassLoadInfo cl_info(protection_domain);
1133     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1134                                                class_loader,
1135                                                cl_info,
1136                                                CHECK_NULL);
1137 
1138     if (log_is_enabled(Debug, class, resolve)) {
1139       trace_class_resolution(ik);
1140     }
1141   } else { // hidden
1142     Handle classData_h(THREAD, JNIHandles::resolve(classData));
1143     ClassLoadInfo cl_info(protection_domain,
1144                           host_class,
1145                           classData_h,
1146                           is_hidden,
1147                           is_strong,
1148                           vm_annotations);
1149     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1150                                                class_loader,
1151                                                cl_info,
1152                                                CHECK_NULL);
1153 
1154     // The hidden class loader data has been artificially been kept alive to
1155     // this point. The mirror and any instances of this class have to keep
1156     // it alive afterwards.
1157     ik->class_loader_data()->dec_keep_alive_ref_count();
1158 
1159     if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1160       ModuleEntry* module = ik->module();
1161       const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1162       log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1163                                   module_name,
1164                                   ik->external_name(),
1165                                   host_class->external_name(),
1166                                   ik->is_hidden() ? "is hidden" : "is not hidden");
1167     }
1168   }
1169 
1170   if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1171     // non-hidden class or nestmate class must be in the same package as the Lookup class
1172     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1173   }
1174 
1175   if (init) {
1176     ik->initialize(CHECK_NULL);
1177   } else {
1178     ik->link_class(CHECK_NULL);
1179   }
1180 
1181   return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1182 }
1183 
1184 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1185   return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1186 JVM_END
1187 
1188 /*
1189  * Define a class with the specified lookup class.
1190  *  lookup:  Lookup class
1191  *  name:    the name of the class
1192  *  buf:     class bytes
1193  *  len:     length of class bytes
1194  *  pd:      protection domain
1195  *  init:    initialize the class
1196  *  flags:   properties of the class
1197  *  classData: private static pre-initialized field
1198  */
1199 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1200           jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1201 
1202   if (lookup == nullptr) {
1203     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1204   }
1205 
1206   assert(buf != nullptr, "buf must not be null");
1207 
1208   return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1209 JVM_END
1210 
1211 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1212 
1213   return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1214 JVM_END
1215 
1216 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1217   ResourceMark rm(THREAD);
1218 
1219   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1220   char* str = java_lang_String::as_utf8_string(h_name());
1221 
1222   // Sanity check, don't expect null
1223   if (str == nullptr) return nullptr;
1224 
1225   // Internalize the string, converting '.' to '/' in string.
1226   char* p = (char*)str;
1227   while (*p != '\0') {
1228     if (*p == '.') {
1229       *p = '/';
1230     }
1231     p++;
1232   }
1233 
1234   const int str_len = (int)(p - str);
1235   if (str_len > Symbol::max_length()) {
1236     // It's impossible to create this class;  the name cannot fit
1237     // into the constant pool.
1238     return nullptr;
1239   }
1240   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1241 
1242   // Security Note:
1243   //   The Java level wrapper will perform the necessary security check allowing
1244   //   us to pass the null as the initiating class loader.
1245   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1246   Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1247 #if INCLUDE_CDS
1248   if (k == nullptr) {
1249     // If the class is not already loaded, try to see if it's in the shared
1250     // archive for the current classloader (h_loader).
1251     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1252   }
1253 #endif
1254   return (k == nullptr) ? nullptr :
1255             (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1256 JVM_END
1257 
1258 // Module support //////////////////////////////////////////////////////////////////////////////
1259 
1260 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1261                                  jstring location, jobjectArray packages))
1262   Handle h_module (THREAD, JNIHandles::resolve(module));
1263   Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1264 JVM_END
1265 
1266 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1267   Handle h_module (THREAD, JNIHandles::resolve(module));
1268   Modules::set_bootloader_unnamed_module(h_module, CHECK);
1269 JVM_END
1270 
1271 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1272   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1273   Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1274   Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1275 JVM_END
1276 
1277 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1278   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1279   Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1280 JVM_END
1281 
1282 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1283   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1284   Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1285 JVM_END
1286 
1287 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1288   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1289   Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1290   Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1291 JVM_END
1292 
1293 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1294   Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1295   Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1296   Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1297 JVM_END
1298 
1299 // Reflection support //////////////////////////////////////////////////////////////////////////////
1300 
1301 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1302   assert (cls != nullptr, "illegal class");
1303   JvmtiVMObjectAllocEventCollector oam;
1304   ResourceMark rm(THREAD);
1305   HandleMark hm(THREAD);
1306   Handle java_class(THREAD, JNIHandles::resolve(cls));
1307   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1308   return (jstring) JNIHandles::make_local(THREAD, result);
1309 JVM_END
1310 
1311 
1312 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1313   JvmtiVMObjectAllocEventCollector oam;
1314   oop mirror = JNIHandles::resolve_non_null(cls);
1315 
1316   // Special handling for primitive objects
1317   if (java_lang_Class::is_primitive(mirror)) {
1318     // Primitive objects does not have any interfaces
1319     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1320     return (jobjectArray) JNIHandles::make_local(THREAD, r);
1321   }
1322 
1323   Klass* klass = java_lang_Class::as_Klass(mirror);
1324   // Figure size of result array
1325   int size;
1326   if (klass->is_instance_klass()) {
1327     InstanceKlass* ik = InstanceKlass::cast(klass);
1328     size = ik->local_interfaces()->length();
1329   } else {
1330     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1331     size = 2;
1332   }
1333 
1334   // Allocate result array
1335   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1336   objArrayHandle result (THREAD, r);
1337   // Fill in result
1338   if (klass->is_instance_klass()) {
1339     // Regular instance klass, fill in all local interfaces
1340     for (int index = 0; index < size; index++) {
1341       InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1342       result->obj_at_put(index, k->java_mirror());
1343     }
1344   } else {
1345     // All arrays implement java.lang.Cloneable and java.io.Serializable
1346     result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1347     result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1348   }
1349   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1350 JVM_END
1351 
1352 
1353 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1354   oop mirror = JNIHandles::resolve_non_null(cls);
1355   if (java_lang_Class::is_primitive(mirror)) {
1356     return JNI_FALSE;
1357   }
1358   Klass* k = java_lang_Class::as_Klass(mirror);
1359   return k->is_hidden();
1360 JVM_END
1361 

1362 class ScopedValueBindingsResolver {
1363 public:
1364   InstanceKlass* Carrier_klass;
1365   ScopedValueBindingsResolver(JavaThread* THREAD) {
1366     Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1367     Carrier_klass = InstanceKlass::cast(k);
1368   }
1369 };
1370 
1371 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1372   ResourceMark rm(THREAD);
1373   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1374   JvmtiVMObjectAllocEventCollector oam;
1375 
1376   static ScopedValueBindingsResolver resolver(THREAD);
1377 
1378   // Iterate through Java frames
1379   vframeStream vfst(thread);
1380   for(; !vfst.at_end(); vfst.next()) {
1381     int loc = -1;
1382     // get method of frame
1383     Method* method = vfst.method();
1384 
1385     Symbol *name = method->name();
1386 
1387     InstanceKlass* holder = method->method_holder();
1388     if (name == vmSymbols::runWith_method_name()) {
1389       if (holder == vmClasses::Thread_klass()
1390           || holder == resolver.Carrier_klass) {
1391         loc = 1;
1392       }
1393     }
1394 
1395     if (loc != -1) {
1396       javaVFrame *frame = vfst.asJavaVFrame();
1397       StackValueCollection* locals = frame->locals();
1398       StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1399       Handle result = head_sv->get_obj();
1400       assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1401       if (result() != nullptr) {
1402         return JNIHandles::make_local(THREAD, result());
1403       }
1404     }
1405   }
1406 
1407   return nullptr;
1408 JVM_END
1409 
1410 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1411   JvmtiVMObjectAllocEventCollector oam;
1412   // ofClass is a reference to a java_lang_Class object. The mirror object
1413   // of an InstanceKlass
1414   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1415   if (java_lang_Class::is_primitive(ofMirror) ||
1416       ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1417     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1418     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1419   }
1420 
1421   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1422   InnerClassesIterator iter(k);
1423 
1424   if (iter.length() == 0) {
1425     // Neither an inner nor outer class
1426     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1427     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1428   }
1429 
1430   // find inner class info
1431   constantPoolHandle cp(thread, k->constants());
1432   int length = iter.length();
1433 
1434   // Allocate temp. result array
1435   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1436   objArrayHandle result (THREAD, r);
1437   int members = 0;
1438 
1439   for (; !iter.done(); iter.next()) {
1440     int ioff = iter.inner_class_info_index();
1441     int ooff = iter.outer_class_info_index();
1442 
1443     if (ioff != 0 && ooff != 0) {
1444       // Check to see if the name matches the class we're looking for
1445       // before attempting to find the class.
1446       if (cp->klass_name_at_matches(k, ooff)) {
1447         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1448         if (outer_klass == k) {
1449            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1450            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1451 
1452            // Throws an exception if outer klass has not declared k as
1453            // an inner klass
1454            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1455 
1456            result->obj_at_put(members, inner_klass->java_mirror());
1457            members++;
1458         }
1459       }
1460     }
1461   }
1462 
1463   if (members != length) {
1464     // Return array of right length
1465     objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1466     for(int i = 0; i < members; i++) {
1467       res->obj_at_put(i, result->obj_at(i));
1468     }
1469     return (jobjectArray)JNIHandles::make_local(THREAD, res);
1470   }
1471 
1472   return (jobjectArray)JNIHandles::make_local(THREAD, result());
1473 JVM_END
1474 
1475 
1476 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1477 {
1478   // ofClass is a reference to a java_lang_Class object.
1479   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1480   if (java_lang_Class::is_primitive(ofMirror)) {
1481     return nullptr;
1482   }
1483   Klass* klass = java_lang_Class::as_Klass(ofMirror);
1484   if (!klass->is_instance_klass()) {
1485     return nullptr;
1486   }
1487 
1488   bool inner_is_member = false;
1489   Klass* outer_klass
1490     = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1491   if (outer_klass == nullptr)  return nullptr;  // already a top-level class
1492   if (!inner_is_member)  return nullptr;     // a hidden class (inside a method)
1493   return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1494 }
1495 JVM_END
1496 
1497 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1498 {
1499   oop mirror = JNIHandles::resolve_non_null(cls);
1500   if (java_lang_Class::is_primitive(mirror)) {
1501     return nullptr;
1502   }
1503   Klass* klass = java_lang_Class::as_Klass(mirror);
1504   if (!klass->is_instance_klass()) {
1505     return nullptr;
1506   }
1507   InstanceKlass* k = InstanceKlass::cast(klass);
1508   int ooff = 0, noff = 0;
1509   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1510     if (noff != 0) {
1511       constantPoolHandle i_cp(thread, k->constants());
1512       Symbol* name = i_cp->symbol_at(noff);
1513       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1514       return (jstring) JNIHandles::make_local(THREAD, str());
1515     }
1516   }
1517   return nullptr;
1518 }
1519 JVM_END
1520 
1521 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1522   assert (cls != nullptr, "illegal class");
1523   JvmtiVMObjectAllocEventCollector oam;
1524   ResourceMark rm(THREAD);
1525   oop mirror = JNIHandles::resolve_non_null(cls);
1526   // Return null for arrays and primitives
1527   if (!java_lang_Class::is_primitive(mirror)) {
1528     Klass* k = java_lang_Class::as_Klass(mirror);
1529     if (k->is_instance_klass()) {
1530       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1531       if (sym == nullptr) return nullptr;
1532       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1533       return (jstring) JNIHandles::make_local(THREAD, str());
1534     }
1535   }
1536   return nullptr;
1537 JVM_END
1538 
1539 
1540 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1541   assert (cls != nullptr, "illegal class");
1542   oop mirror = JNIHandles::resolve_non_null(cls);
1543   // Return null for arrays and primitives
1544   if (!java_lang_Class::is_primitive(mirror)) {
1545     Klass* k = java_lang_Class::as_Klass(mirror);
1546     if (k->is_instance_klass()) {
1547       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1548       return (jbyteArray) JNIHandles::make_local(THREAD, a);
1549     }
1550   }
1551   return nullptr;
1552 JVM_END
1553 
1554 
1555 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1556   // some of this code was adapted from from jni_FromReflectedField
1557 
1558   oop reflected = JNIHandles::resolve_non_null(field);
1559   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1560   int slot      = java_lang_reflect_Field::slot(reflected);
1561   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1562 
1563   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1564   int offset = ik->field_offset(slot);
1565 
1566   if (modifiers & JVM_ACC_STATIC) {
1567     // for static fields we only look in the current class
1568     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1569       assert(false, "cannot find static field");
1570       return false;
1571     }
1572   } else {
1573     // for instance fields we start with the current class and work
1574     // our way up through the superclass chain
1575     if (!ik->find_field_from_offset(offset, false, &fd)) {
1576       assert(false, "cannot find instance field");
1577       return false;
1578     }
1579   }
1580   return true;
1581 }
1582 
1583 static Method* jvm_get_method_common(jobject method) {
1584   // some of this code was adapted from from jni_FromReflectedMethod
1585 
1586   oop reflected = JNIHandles::resolve_non_null(method);
1587   oop mirror    = nullptr;
1588   int slot      = 0;
1589 
1590   if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1591     mirror = java_lang_reflect_Constructor::clazz(reflected);
1592     slot   = java_lang_reflect_Constructor::slot(reflected);
1593   } else {
1594     assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1595            "wrong type");
1596     mirror = java_lang_reflect_Method::clazz(reflected);
1597     slot   = java_lang_reflect_Method::slot(reflected);
1598   }
1599   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1600 
1601   Method* m = ik->method_with_idnum(slot);
1602   assert(m != nullptr, "cannot find method");
1603   return m;  // caller has to deal with null in product mode
1604 }
1605 
1606 /* Type use annotations support (JDK 1.8) */
1607 
1608 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1609   assert (cls != nullptr, "illegal class");
1610   ResourceMark rm(THREAD);
1611   // Return null for arrays and primitives
1612   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1613     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1614     if (k->is_instance_klass()) {
1615       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1616       if (type_annotations != nullptr) {
1617         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1618         return (jbyteArray) JNIHandles::make_local(THREAD, a);
1619       }
1620     }
1621   }
1622   return nullptr;
1623 JVM_END
1624 
1625 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1626   assert (method != nullptr, "illegal method");
1627   // method is a handle to a java.lang.reflect.Method object
1628   Method* m = jvm_get_method_common(method);
1629   if (m == nullptr) {
1630     return nullptr;
1631   }
1632 
1633   AnnotationArray* type_annotations = m->type_annotations();
1634   if (type_annotations != nullptr) {
1635     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1636     return (jbyteArray) JNIHandles::make_local(THREAD, a);
1637   }
1638 
1639   return nullptr;
1640 JVM_END
1641 
1642 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1643   assert (field != nullptr, "illegal field");
1644   fieldDescriptor fd;
1645   bool gotFd = jvm_get_field_common(field, fd);
1646   if (!gotFd) {
1647     return nullptr;
1648   }
1649 
1650   return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1651 JVM_END
1652 
1653 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1654   if (!cp->is_within_bounds(index)) {
1655     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1656   }
1657 }
1658 
1659 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1660 {
1661   // method is a handle to a java.lang.reflect.Method object
1662   Method* method_ptr = jvm_get_method_common(method);
1663   methodHandle mh (THREAD, method_ptr);
1664   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1665   const int num_params = mh->method_parameters_length();
1666 
1667   if (num_params < 0) {
1668     // A -1 return value from method_parameters_length means there is no
1669     // parameter data.  Return null to indicate this to the reflection
1670     // API.
1671     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1672     return (jobjectArray)nullptr;
1673   } else {
1674     // Otherwise, we return something up to reflection, even if it is
1675     // a zero-length array.  Why?  Because in some cases this can
1676     // trigger a MalformedParametersException.
1677 
1678     // make sure all the symbols are properly formatted
1679     for (int i = 0; i < num_params; i++) {
1680       MethodParametersElement* params = mh->method_parameters_start();
1681       int index = params[i].name_cp_index;
1682       constantPoolHandle cp(THREAD, mh->constants());
1683       bounds_check(cp, index, CHECK_NULL);
1684 
1685       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1686         THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1687                        "Wrong type at constant pool index");
1688       }
1689 
1690     }
1691 
1692     objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1693     objArrayHandle result (THREAD, result_oop);
1694 
1695     for (int i = 0; i < num_params; i++) {
1696       MethodParametersElement* params = mh->method_parameters_start();
1697       // For a 0 index, give a null symbol
1698       Symbol* sym = 0 != params[i].name_cp_index ?
1699         mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1700       int flags = params[i].flags;
1701       oop param = Reflection::new_parameter(reflected_method, i, sym,
1702                                             flags, CHECK_NULL);
1703       result->obj_at_put(i, param);
1704     }
1705     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1706   }
1707 }
1708 JVM_END
1709 
1710 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1711 
1712 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1713 {
1714   JvmtiVMObjectAllocEventCollector oam;
1715 
1716   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1717   // Exclude primitive types and array types
1718   if (java_lang_Class::is_primitive(ofMirror) ||
1719       java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1720     // Return empty array
1721     oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1722     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1723   }
1724 
1725   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1726   constantPoolHandle cp(THREAD, k->constants());
1727 
1728   // Ensure class is linked
1729   k->link_class(CHECK_NULL);
1730 
1731   // Allocate result
1732   int num_fields;
1733 
1734   if (publicOnly) {
1735     num_fields = 0;
1736     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1737       if (fs.access_flags().is_public()) ++num_fields;
1738     }
1739   } else {
1740     num_fields = k->java_fields_count();
1741   }
1742 
1743   objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1744   objArrayHandle result (THREAD, r);
1745 
1746   int out_idx = 0;
1747   fieldDescriptor fd;
1748   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1749     if (!publicOnly || fs.access_flags().is_public()) {
1750       fd.reinitialize(k, fs.to_FieldInfo());
1751       oop field = Reflection::new_field(&fd, CHECK_NULL);
1752       result->obj_at_put(out_idx, field);
1753       ++out_idx;
1754     }
1755   }
1756   assert(out_idx == num_fields, "just checking");
1757   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1758 }
1759 JVM_END
1760 
1761 // A class is a record if and only if it is final and a direct subclass of
1762 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1763 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1764 {
1765   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1766   if (k != nullptr && k->is_instance_klass()) {
1767     InstanceKlass* ik = InstanceKlass::cast(k);
1768     return ik->is_record();
1769   } else {
1770     return false;
1771   }
1772 }
1773 JVM_END
1774 
1775 // Returns an array containing the components of the Record attribute,
1776 // or null if the attribute is not present.
1777 //
1778 // Note that this function returns the components of the Record attribute
1779 // even if the class is not a record.
1780 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1781 {
1782   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1783 
1784   Array<RecordComponent*>* components = ik->record_components();
1785   if (components != nullptr) {
1786     JvmtiVMObjectAllocEventCollector oam;
1787     constantPoolHandle cp(THREAD, ik->constants());
1788     int length = components->length();
1789     assert(length >= 0, "unexpected record_components length");
1790     objArrayOop record_components =
1791       oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1792     objArrayHandle components_h (THREAD, record_components);
1793 
1794     for (int x = 0; x < length; x++) {
1795       RecordComponent* component = components->at(x);
1796       assert(component != nullptr, "unexpected null record component");
1797       oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1798       components_h->obj_at_put(x, component_oop);
1799     }
1800     return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1801   }
1802 
1803   return nullptr;
1804 }
1805 JVM_END
1806 
1807 static jobjectArray get_class_declared_methods_helper(
1808                                   JNIEnv *env,
1809                                   jclass ofClass, jboolean publicOnly,
1810                                   bool want_constructor,
1811                                   Klass* klass, TRAPS) {
1812 
1813   JvmtiVMObjectAllocEventCollector oam;
1814 
1815   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1816   // Exclude primitive types and array types
1817   if (java_lang_Class::is_primitive(ofMirror)
1818       || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1819     // Return empty array
1820     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1821     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1822   }
1823 
1824   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1825 
1826   // Ensure class is linked
1827   k->link_class(CHECK_NULL);
1828 
1829   Array<Method*>* methods = k->methods();
1830   int methods_length = methods->length();
1831 
1832   // Save original method_idnum in case of redefinition, which can change
1833   // the idnum of obsolete methods.  The new method will have the same idnum
1834   // but if we refresh the methods array, the counts will be wrong.
1835   ResourceMark rm(THREAD);
1836   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1837   int num_methods = 0;
1838 
1839   // Select methods matching the criteria.
1840   for (int i = 0; i < methods_length; i++) {
1841     Method* method = methods->at(i);
1842     if (want_constructor && !method->is_object_constructor()) {
1843       continue;
1844     }
1845     if (!want_constructor &&
1846         (method->is_object_constructor() || method->is_class_initializer() ||
1847          method->is_overpass())) {
1848       continue;
1849     }
1850     if (publicOnly && !method->is_public()) {
1851       continue;
1852     }
1853     idnums->push(method->method_idnum());
1854     ++num_methods;
1855   }
1856 
1857   // Allocate result
1858   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1859   objArrayHandle result (THREAD, r);
1860 
1861   // Now just put the methods that we selected above, but go by their idnum
1862   // in case of redefinition.  The methods can be redefined at any safepoint,
1863   // so above when allocating the oop array and below when creating reflect
1864   // objects.
1865   for (int i = 0; i < num_methods; i++) {
1866     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1867     if (method.is_null()) {
1868       // Method may have been deleted and seems this API can handle null
1869       // Otherwise should probably put a method that throws NSME
1870       result->obj_at_put(i, nullptr);
1871     } else {
1872       oop m;
1873       if (want_constructor) {
1874         assert(method->is_object_constructor(), "must be");
1875         m = Reflection::new_constructor(method, CHECK_NULL);
1876       } else {
1877         m = Reflection::new_method(method, false, CHECK_NULL);
1878       }
1879       result->obj_at_put(i, m);
1880     }
1881   }
1882 
1883   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1884 }
1885 
1886 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1887 {
1888   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1889                                            /*want_constructor*/ false,
1890                                            vmClasses::reflect_Method_klass(), THREAD);
1891 }
1892 JVM_END
1893 
1894 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1895 {
1896   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1897                                            /*want_constructor*/ true,
1898                                            vmClasses::reflect_Constructor_klass(), THREAD);
1899 }
1900 JVM_END
1901 
1902 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1903 {
1904   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1905   InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1906   return c->has_nestmate_access_to(m, THREAD);
1907 }
1908 JVM_END
1909 
1910 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1911 {
1912   // current is not a primitive or array class
1913   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1914   InstanceKlass* host = c->nest_host(THREAD);
1915   return (jclass) (host == nullptr ? nullptr :
1916                    JNIHandles::make_local(THREAD, host->java_mirror()));
1917 }
1918 JVM_END
1919 
1920 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1921 {
1922   // current is not a primitive or array class
1923   ResourceMark rm(THREAD);
1924   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1925   InstanceKlass* host = c->nest_host(THREAD);
1926 
1927   log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1928                               c->external_name(), host->external_name());
1929   {
1930     JvmtiVMObjectAllocEventCollector oam;
1931     Array<u2>* members = host->nest_members();
1932     int length = members == nullptr ? 0 : members->length();
1933 
1934     log_trace(class, nestmates)(" - host has %d listed nest members", length);
1935 
1936     // nest host is first in the array so make it one bigger
1937     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1938                                              length + 1, CHECK_NULL);
1939     objArrayHandle result(THREAD, r);
1940     result->obj_at_put(0, host->java_mirror());
1941     if (length != 0) {
1942       int count = 0;
1943       for (int i = 0; i < length; i++) {
1944         int cp_index = members->at(i);
1945         Klass* k = host->constants()->klass_at(cp_index, THREAD);
1946         if (HAS_PENDING_EXCEPTION) {
1947           if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1948             return nullptr; // propagate VMEs
1949           }
1950           if (log_is_enabled(Trace, class, nestmates)) {
1951             stringStream ss;
1952             char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1953             ss.print(" - resolution of nest member %s failed: ", target_member_class);
1954             java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1955             log_trace(class, nestmates)("%s", ss.as_string());
1956           }
1957           CLEAR_PENDING_EXCEPTION;
1958           continue;
1959         }
1960         if (k->is_instance_klass()) {
1961           InstanceKlass* ik = InstanceKlass::cast(k);
1962           InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1963           if (nest_host_k == host) {
1964             result->obj_at_put(count+1, k->java_mirror());
1965             count++;
1966             log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1967           } else {
1968             log_trace(class, nestmates)(" - skipping member %s with different host %s",
1969                                         ik->external_name(), nest_host_k->external_name());
1970           }
1971         } else {
1972           log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1973                                       k->external_name());
1974         }
1975       }
1976       if (count < length) {
1977         // we had invalid entries so we need to compact the array
1978         log_trace(class, nestmates)(" - compacting array from length %d to %d",
1979                                     length + 1, count + 1);
1980 
1981         objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1982                                                   count + 1, CHECK_NULL);
1983         objArrayHandle result2(THREAD, r2);
1984         for (int i = 0; i < count + 1; i++) {
1985           result2->obj_at_put(i, result->obj_at(i));
1986         }
1987         return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1988       }
1989     }
1990     else {
1991       assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1992     }
1993     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1994   }
1995 }
1996 JVM_END
1997 
1998 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1999 {
2000   oop mirror = JNIHandles::resolve_non_null(current);
2001   assert(!java_lang_Class::is_primitive(mirror), "should not be");
2002   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2003 
2004   ResourceMark rm(THREAD);
2005   log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2006                            ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2007   if (ik->is_sealed()) {
2008     JvmtiVMObjectAllocEventCollector oam;
2009     Array<u2>* subclasses = ik->permitted_subclasses();
2010     int length = subclasses->length();
2011 
2012     log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2013 
2014     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2015                                              length, CHECK_NULL);
2016     objArrayHandle result(THREAD, r);
2017     int count = 0;
2018     for (int i = 0; i < length; i++) {
2019       int cp_index = subclasses->at(i);
2020       Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2021       if (HAS_PENDING_EXCEPTION) {
2022         if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2023           return nullptr; // propagate VMEs
2024         }
2025         if (log_is_enabled(Trace, class, sealed)) {
2026           stringStream ss;
2027           char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2028           ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2029           java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2030           log_trace(class, sealed)("%s", ss.as_string());
2031         }
2032 
2033         CLEAR_PENDING_EXCEPTION;
2034         continue;
2035       }
2036       if (k->is_instance_klass()) {
2037         result->obj_at_put(count++, k->java_mirror());
2038         log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2039       }
2040     }
2041     if (count < length) {
2042       // we had invalid entries so we need to compact the array
2043       objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2044                                                 count, CHECK_NULL);
2045       objArrayHandle result2(THREAD, r2);
2046       for (int i = 0; i < count; i++) {
2047         result2->obj_at_put(i, result->obj_at(i));
2048       }
2049       return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2050     }
2051     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2052   } else {
2053     return nullptr;
2054   }
2055 }
2056 JVM_END
2057 
2058 // Constant pool access //////////////////////////////////////////////////////////
2059 
2060 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2061 {
2062   JvmtiVMObjectAllocEventCollector oam;
2063   oop mirror = JNIHandles::resolve_non_null(cls);
2064   // Return null for primitives and arrays
2065   if (!java_lang_Class::is_primitive(mirror)) {
2066     Klass* k = java_lang_Class::as_Klass(mirror);
2067     if (k->is_instance_klass()) {
2068       InstanceKlass* k_h = InstanceKlass::cast(k);
2069       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2070       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2071       return JNIHandles::make_local(THREAD, jcp());
2072     }
2073   }
2074   return nullptr;
2075 }
2076 JVM_END
2077 
2078 
2079 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2080 {
2081   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2082   return cp->length();
2083 }
2084 JVM_END
2085 
2086 
2087 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2088 {
2089   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2090   bounds_check(cp, index, CHECK_NULL);
2091   constantTag tag = cp->tag_at(index);
2092   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2093     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2094   }
2095   Klass* k = cp->klass_at(index, CHECK_NULL);
2096   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2097 }
2098 JVM_END
2099 
2100 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2101 {
2102   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2103   bounds_check(cp, index, CHECK_NULL);
2104   constantTag tag = cp->tag_at(index);
2105   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2106     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2107   }
2108   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2109   if (k == nullptr) return nullptr;
2110   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2111 }
2112 JVM_END
2113 
2114 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2115   constantTag tag = cp->tag_at(index);
2116   if (!tag.is_method() && !tag.is_interface_method()) {
2117     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2118   }
2119   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2120   Klass* k_o;
2121   if (force_resolution) {
2122     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2123   } else {
2124     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2125     if (k_o == nullptr) return nullptr;
2126   }
2127   InstanceKlass* k = InstanceKlass::cast(k_o);
2128   Symbol* name = cp->uncached_name_ref_at(index);
2129   Symbol* sig  = cp->uncached_signature_ref_at(index);
2130   methodHandle m (THREAD, k->find_method(name, sig));
2131   if (m.is_null()) {
2132     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2133   }
2134   oop method;
2135   if (m->is_object_constructor()) {
2136     method = Reflection::new_constructor(m, CHECK_NULL);
2137   } else {

2138     method = Reflection::new_method(m, true, CHECK_NULL);
2139   }
2140   return JNIHandles::make_local(THREAD, method);
2141 }
2142 
2143 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2144 {
2145   JvmtiVMObjectAllocEventCollector oam;
2146   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2147   bounds_check(cp, index, CHECK_NULL);
2148   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2149   return res;
2150 }
2151 JVM_END
2152 
2153 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2154 {
2155   JvmtiVMObjectAllocEventCollector oam;
2156   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2157   bounds_check(cp, index, CHECK_NULL);
2158   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2159   return res;
2160 }
2161 JVM_END
2162 
2163 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2164   constantTag tag = cp->tag_at(index);
2165   if (!tag.is_field()) {
2166     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2167   }
2168   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2169   Klass* k_o;
2170   if (force_resolution) {
2171     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2172   } else {
2173     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2174     if (k_o == nullptr) return nullptr;
2175   }
2176   InstanceKlass* k = InstanceKlass::cast(k_o);
2177   Symbol* name = cp->uncached_name_ref_at(index);
2178   Symbol* sig  = cp->uncached_signature_ref_at(index);
2179   fieldDescriptor fd;
2180   Klass* target_klass = k->find_field(name, sig, &fd);
2181   if (target_klass == nullptr) {
2182     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2183   }
2184   oop field = Reflection::new_field(&fd, CHECK_NULL);
2185   return JNIHandles::make_local(THREAD, field);
2186 }
2187 
2188 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2189 {
2190   JvmtiVMObjectAllocEventCollector oam;
2191   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2192   bounds_check(cp, index, CHECK_NULL);
2193   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2194   return res;
2195 }
2196 JVM_END
2197 
2198 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2199 {
2200   JvmtiVMObjectAllocEventCollector oam;
2201   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2202   bounds_check(cp, index, CHECK_NULL);
2203   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2204   return res;
2205 }
2206 JVM_END
2207 
2208 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2209 {
2210   JvmtiVMObjectAllocEventCollector oam;
2211   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2212   bounds_check(cp, index, CHECK_NULL);
2213   constantTag tag = cp->tag_at(index);
2214   if (!tag.is_field_or_method()) {
2215     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2216   }
2217   int klass_ref = cp->uncached_klass_ref_index_at(index);
2218   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2219   Symbol*  member_name = cp->uncached_name_ref_at(index);
2220   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2221   objArrayOop  dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2222   objArrayHandle dest(THREAD, dest_o);
2223   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2224   dest->obj_at_put(0, str());
2225   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2226   dest->obj_at_put(1, str());
2227   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2228   dest->obj_at_put(2, str());
2229   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2230 }
2231 JVM_END
2232 
2233 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2234 {
2235   JvmtiVMObjectAllocEventCollector oam;
2236   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2237   bounds_check(cp, index, CHECK_0);
2238   constantTag tag = cp->tag_at(index);
2239   if (!tag.is_field_or_method()) {
2240     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2241   }
2242   return (jint) cp->uncached_klass_ref_index_at(index);
2243 }
2244 JVM_END
2245 
2246 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2247 {
2248   JvmtiVMObjectAllocEventCollector oam;
2249   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2250   bounds_check(cp, index, CHECK_0);
2251   constantTag tag = cp->tag_at(index);
2252   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2253     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2254   }
2255   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2256 }
2257 JVM_END
2258 
2259 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2260 {
2261   JvmtiVMObjectAllocEventCollector oam;
2262   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2263   bounds_check(cp, index, CHECK_NULL);
2264   constantTag tag = cp->tag_at(index);
2265   if (!tag.is_name_and_type()) {
2266     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2267   }
2268   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2269   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2270   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2271   objArrayHandle dest(THREAD, dest_o);
2272   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2273   dest->obj_at_put(0, str());
2274   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2275   dest->obj_at_put(1, str());
2276   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2277 }
2278 JVM_END
2279 
2280 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2281 {
2282   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2283   bounds_check(cp, index, CHECK_0);
2284   constantTag tag = cp->tag_at(index);
2285   if (!tag.is_int()) {
2286     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2287   }
2288   return cp->int_at(index);
2289 }
2290 JVM_END
2291 
2292 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2293 {
2294   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2295   bounds_check(cp, index, CHECK_(0L));
2296   constantTag tag = cp->tag_at(index);
2297   if (!tag.is_long()) {
2298     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2299   }
2300   return cp->long_at(index);
2301 }
2302 JVM_END
2303 
2304 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2305 {
2306   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2307   bounds_check(cp, index, CHECK_(0.0f));
2308   constantTag tag = cp->tag_at(index);
2309   if (!tag.is_float()) {
2310     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2311   }
2312   return cp->float_at(index);
2313 }
2314 JVM_END
2315 
2316 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2317 {
2318   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2319   bounds_check(cp, index, CHECK_(0.0));
2320   constantTag tag = cp->tag_at(index);
2321   if (!tag.is_double()) {
2322     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2323   }
2324   return cp->double_at(index);
2325 }
2326 JVM_END
2327 
2328 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2329 {
2330   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2331   bounds_check(cp, index, CHECK_NULL);
2332   constantTag tag = cp->tag_at(index);
2333   if (!tag.is_string()) {
2334     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2335   }
2336   oop str = cp->string_at(index, CHECK_NULL);
2337   return (jstring) JNIHandles::make_local(THREAD, str);
2338 }
2339 JVM_END
2340 
2341 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2342 {
2343   JvmtiVMObjectAllocEventCollector oam;
2344   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2345   bounds_check(cp, index, CHECK_NULL);
2346   constantTag tag = cp->tag_at(index);
2347   if (!tag.is_symbol()) {
2348     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2349   }
2350   Symbol* sym = cp->symbol_at(index);
2351   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2352   return (jstring) JNIHandles::make_local(THREAD, str());
2353 }
2354 JVM_END
2355 
2356 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2357 {
2358   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2359   bounds_check(cp, index, CHECK_0);
2360   constantTag tag = cp->tag_at(index);
2361   jbyte result = tag.value();
2362   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2363   // they are changed to the corresponding tags from the JVM spec, so that java code in
2364   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2365   if (tag.is_klass_or_reference()) {
2366       result = JVM_CONSTANT_Class;
2367   } else if (tag.is_string_index()) {
2368       result = JVM_CONSTANT_String;
2369   } else if (tag.is_method_type_in_error()) {
2370       result = JVM_CONSTANT_MethodType;
2371   } else if (tag.is_method_handle_in_error()) {
2372       result = JVM_CONSTANT_MethodHandle;
2373   } else if (tag.is_dynamic_constant_in_error()) {
2374       result = JVM_CONSTANT_Dynamic;
2375   }
2376   return result;
2377 }
2378 JVM_END
2379 
2380 // Assertion support. //////////////////////////////////////////////////////////
2381 
2382 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2383   assert(cls != nullptr, "bad class");
2384 
2385   oop r = JNIHandles::resolve(cls);
2386   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2387   if (java_lang_Class::is_primitive(r)) return false;
2388 
2389   Klass* k = java_lang_Class::as_Klass(r);
2390   assert(k->is_instance_klass(), "must be an instance klass");
2391   if (!k->is_instance_klass()) return false;
2392 
2393   ResourceMark rm(THREAD);
2394   const char* name = k->name()->as_C_string();
2395   bool system_class = k->class_loader() == nullptr;
2396   return JavaAssertions::enabled(name, system_class);
2397 
2398 JVM_END
2399 
2400 
2401 // Return a new AssertionStatusDirectives object with the fields filled in with
2402 // command-line assertion arguments (i.e., -ea, -da).
2403 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2404   JvmtiVMObjectAllocEventCollector oam;
2405   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2406   return JNIHandles::make_local(THREAD, asd);
2407 JVM_END
2408 
2409 // Verification ////////////////////////////////////////////////////////////////////////////////
2410 
2411 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2412 
2413 // RedefineClasses support: bug 6214132 caused verification to fail.
2414 // All functions from this section, unless noted otherwise, should call the functions
2415 //   get_klass_considering_redefinition(), or
2416 //   get_instance_klass_considering_redefinition()
2417 // These functions return JvmtiThreadState::_scratch_class if the verifier
2418 // was invoked in the middle of the redefinition of cls.
2419 // See jvmtiThreadState.hpp for details.
2420 
2421 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2422   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2423   if (k->is_instance_klass()) {
2424     return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2425   } else {
2426     return k;
2427   }
2428 }
2429 
2430 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2431   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2432   return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2433 }
2434 
2435 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2436   oop mirror = JNIHandles::resolve_non_null(cls);
2437   if (java_lang_Class::is_primitive(mirror)) {
2438     return JNI_FALSE;
2439   }
2440   Klass* k = java_lang_Class::as_Klass(mirror);
2441   // This isn't necessary since answer is the same because redefinition
2442   // has already checked this matches for the scratch class.
2443   // k = get_klass_considering_redefinition(cls, thread)
2444   jboolean result = k->is_interface();
2445   assert(!result || k->is_instance_klass(),
2446          "all interfaces are instance types");
2447   return result;
2448 JVM_END
2449 
2450 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2451   // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2452   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2453   return k->name()->as_utf8();
2454 JVM_END
2455 
2456 
2457 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2458   Klass* k = get_klass_considering_redefinition(cls, thread);
2459   // types will have length zero if this is not an InstanceKlass
2460   // (length is determined by call to JVM_GetClassCPEntriesCount)
2461   if (k->is_instance_klass()) {
2462     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2463     for (int index = cp->length() - 1; index >= 0; index--) {
2464       constantTag tag = cp->tag_at(index);
2465       types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2466     }
2467   }
2468 JVM_END
2469 
2470 
2471 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2472   Klass* k = get_klass_considering_redefinition(cls, thread);
2473   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2474 JVM_END
2475 
2476 
2477 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2478   Klass* k = get_klass_considering_redefinition(cls, thread);
2479   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2480 JVM_END
2481 
2482 
2483 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2484   Klass* k = get_klass_considering_redefinition(cls, thread);
2485   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2486 JVM_END
2487 
2488 
2489 // The following methods, used for the verifier, are never called with
2490 // array klasses, so a direct cast to InstanceKlass is safe.
2491 // Typically, these methods are called in a loop with bounds determined
2492 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2493 // zero for arrays.
2494 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2495   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2496   Method* method = ik->methods()->at(method_index);
2497   int length = method->checked_exceptions_length();
2498   if (length > 0) {
2499     CheckedExceptionElement* table= method->checked_exceptions_start();
2500     for (int i = 0; i < length; i++) {
2501       exceptions[i] = table[i].class_cp_index;
2502     }
2503   }
2504 JVM_END
2505 
2506 
2507 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2508   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2509   Method* method = ik->methods()->at(method_index);
2510   return method->checked_exceptions_length();
2511 JVM_END
2512 
2513 
2514 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2515   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2516   Method* method = ik->methods()->at(method_index);
2517   memcpy(code, method->code_base(), method->code_size());
2518 JVM_END
2519 
2520 
2521 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2522   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2523   Method* method = ik->methods()->at(method_index);
2524   return method->code_size();
2525 JVM_END
2526 
2527 
2528 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2529   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2530   Method* method = ik->methods()->at(method_index);
2531   ExceptionTable extable(method);
2532   entry->start_pc   = extable.start_pc(entry_index);
2533   entry->end_pc     = extable.end_pc(entry_index);
2534   entry->handler_pc = extable.handler_pc(entry_index);
2535   entry->catchType  = extable.catch_type_index(entry_index);
2536 JVM_END
2537 
2538 
2539 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2540   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2541   Method* method = ik->methods()->at(method_index);
2542   return method->exception_table_length();
2543 JVM_END
2544 
2545 
2546 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2547   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2548   Method* method = ik->methods()->at(method_index);
2549   return method->access_flags().as_method_flags();
2550 JVM_END
2551 
2552 
2553 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2554   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2555   return ik->field_access_flags(field_index);
2556 JVM_END
2557 
2558 
2559 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2560   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2561   Method* method = ik->methods()->at(method_index);
2562   return method->max_locals();
2563 JVM_END
2564 
2565 
2566 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2567   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2568   Method* method = ik->methods()->at(method_index);
2569   return method->size_of_parameters();
2570 JVM_END
2571 
2572 
2573 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2574   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2575   Method* method = ik->methods()->at(method_index);
2576   return method->verifier_max_stack();
2577 JVM_END
2578 
2579 
2580 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2581   ResourceMark rm(THREAD);
2582   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2583   Method* method = ik->methods()->at(method_index);
2584   return method->is_object_constructor();
2585 JVM_END
2586 
2587 
2588 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2589   ResourceMark rm(THREAD);
2590   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2591   Method* method = ik->methods()->at(method_index);
2592   return method->is_overpass();
2593 JVM_END
2594 
2595 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2596   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2597   Method* method = ik->methods()->at(method_index);
2598   return method->name()->as_utf8();
2599 JVM_END
2600 
2601 
2602 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2603   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2604   Method* method = ik->methods()->at(method_index);
2605   return method->signature()->as_utf8();
2606 JVM_END
2607 
2608 /**
2609  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2610  * read entries in the constant pool.  Since the old verifier always
2611  * works on a copy of the code, it will not see any rewriting that
2612  * may possibly occur in the middle of verification.  So it is important
2613  * that nothing it calls tries to use the cpCache instead of the raw
2614  * constant pool, so we must use cp->uncached_x methods when appropriate.
2615  */
2616 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2617   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2618   ConstantPool* cp = ik->constants();
2619   switch (cp->tag_at(cp_index).value()) {
2620     case JVM_CONSTANT_Fieldref:
2621       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2622     default:
2623       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2624   }
2625   ShouldNotReachHere();
2626   return nullptr;
2627 JVM_END
2628 
2629 
2630 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2631   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2632   ConstantPool* cp = ik->constants();
2633   switch (cp->tag_at(cp_index).value()) {
2634     case JVM_CONSTANT_InterfaceMethodref:
2635     case JVM_CONSTANT_Methodref:
2636       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2637     default:
2638       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2639   }
2640   ShouldNotReachHere();
2641   return nullptr;
2642 JVM_END
2643 
2644 
2645 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2646   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2647   ConstantPool* cp = ik->constants();
2648   switch (cp->tag_at(cp_index).value()) {
2649     case JVM_CONSTANT_InterfaceMethodref:
2650     case JVM_CONSTANT_Methodref:
2651       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2652     default:
2653       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2654   }
2655   ShouldNotReachHere();
2656   return nullptr;
2657 JVM_END
2658 
2659 
2660 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2661   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2662   ConstantPool* cp = ik->constants();
2663   switch (cp->tag_at(cp_index).value()) {
2664     case JVM_CONSTANT_Fieldref:
2665       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2666     default:
2667       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2668   }
2669   ShouldNotReachHere();
2670   return nullptr;
2671 JVM_END
2672 
2673 
2674 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2675   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2676   ConstantPool* cp = ik->constants();
2677   Symbol* classname = cp->klass_name_at(cp_index);
2678   return classname->as_utf8();
2679 JVM_END
2680 
2681 
2682 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2683   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2684   ConstantPool* cp = ik->constants();
2685   switch (cp->tag_at(cp_index).value()) {
2686     case JVM_CONSTANT_Fieldref: {
2687       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2688       Symbol* classname = cp->klass_name_at(class_index);
2689       return classname->as_utf8();
2690     }
2691     default:
2692       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2693   }
2694   ShouldNotReachHere();
2695   return nullptr;
2696 JVM_END
2697 
2698 
2699 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2700   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2701   ConstantPool* cp = ik->constants();
2702   switch (cp->tag_at(cp_index).value()) {
2703     case JVM_CONSTANT_Methodref:
2704     case JVM_CONSTANT_InterfaceMethodref: {
2705       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2706       Symbol* classname = cp->klass_name_at(class_index);
2707       return classname->as_utf8();
2708     }
2709     default:
2710       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2711   }
2712   ShouldNotReachHere();
2713   return nullptr;
2714 JVM_END
2715 
2716 
2717 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2718   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2719   InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2720   ConstantPool* cp = ik->constants();
2721   ConstantPool* cp_called = ik_called->constants();
2722   switch (cp->tag_at(cp_index).value()) {
2723     case JVM_CONSTANT_Fieldref: {
2724       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2725       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2726       for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2727         if (fs.name() == name && fs.signature() == signature) {
2728           return fs.access_flags().as_field_flags();
2729         }
2730       }
2731       return -1;
2732     }
2733     default:
2734       fatal("JVM_GetCPFieldModifiers: illegal constant");
2735   }
2736   ShouldNotReachHere();
2737   return 0;
2738 JVM_END
2739 
2740 
2741 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2742   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2743   InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2744   ConstantPool* cp = ik->constants();
2745   switch (cp->tag_at(cp_index).value()) {
2746     case JVM_CONSTANT_Methodref:
2747     case JVM_CONSTANT_InterfaceMethodref: {
2748       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2749       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2750       Array<Method*>* methods = ik_called->methods();
2751       int methods_count = methods->length();
2752       for (int i = 0; i < methods_count; i++) {
2753         Method* method = methods->at(i);
2754         if (method->name() == name && method->signature() == signature) {
2755             return method->access_flags().as_method_flags();
2756         }
2757       }
2758       return -1;
2759     }
2760     default:
2761       fatal("JVM_GetCPMethodModifiers: illegal constant");
2762   }
2763   ShouldNotReachHere();
2764   return 0;
2765 JVM_END
2766 
2767 
2768 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2769 
2770 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2771   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2772 JVM_END
2773 
2774 
2775 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2776   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2777   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2778   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2779   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2780   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2781 JVM_END
2782 
2783 // Printing support //////////////////////////////////////////////////
2784 extern "C" {
2785 
2786 ATTRIBUTE_PRINTF(3, 0)
2787 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2788   // Reject count values that are negative signed values converted to
2789   // unsigned; see bug 4399518, 4417214
2790   if ((intptr_t)count <= 0) return -1;
2791 
2792   int result = os::vsnprintf(str, count, fmt, args);
2793   if (result > 0 && (size_t)result >= count) {
2794     result = -1;
2795   }
2796 
2797   return result;
2798 }
2799 
2800 ATTRIBUTE_PRINTF(3, 4)
2801 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2802   va_list args;
2803   int len;
2804   va_start(args, fmt);
2805   len = jio_vsnprintf(str, count, fmt, args);
2806   va_end(args);
2807   return len;
2808 }
2809 
2810 ATTRIBUTE_PRINTF(2, 3)
2811 int jio_fprintf(FILE* f, const char *fmt, ...) {
2812   int len;
2813   va_list args;
2814   va_start(args, fmt);
2815   len = jio_vfprintf(f, fmt, args);
2816   va_end(args);
2817   return len;
2818 }
2819 
2820 ATTRIBUTE_PRINTF(2, 0)
2821 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2822   if (Arguments::vfprintf_hook() != nullptr) {
2823      return Arguments::vfprintf_hook()(f, fmt, args);
2824   } else {
2825     return vfprintf(f, fmt, args);
2826   }
2827 }
2828 
2829 ATTRIBUTE_PRINTF(1, 2)
2830 JNIEXPORT int jio_printf(const char *fmt, ...) {
2831   int len;
2832   va_list args;
2833   va_start(args, fmt);
2834   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2835   va_end(args);
2836   return len;
2837 }
2838 
2839 // HotSpot specific jio method
2840 void jio_print(const char* s, size_t len) {
2841   // Try to make this function as atomic as possible.
2842   if (Arguments::vfprintf_hook() != nullptr) {
2843     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2844   } else {
2845     // Make an unused local variable to avoid warning from gcc compiler.
2846     bool dummy = os::write(defaultStream::output_fd(), s, len);
2847   }
2848 }
2849 
2850 } // Extern C
2851 
2852 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2853 
2854 // In most of the JVM thread support functions we need to access the
2855 // thread through a ThreadsListHandle to prevent it from exiting and
2856 // being reclaimed while we try to operate on it. The exceptions to this
2857 // rule are when operating on the current thread, or if the monitor of
2858 // the target java.lang.Thread is locked at the Java level - in both
2859 // cases the target cannot exit.
2860 
2861 static void thread_entry(JavaThread* thread, TRAPS) {
2862   HandleMark hm(THREAD);
2863   Handle obj(THREAD, thread->threadObj());
2864   JavaValue result(T_VOID);
2865   JavaCalls::call_virtual(&result,
2866                           obj,
2867                           vmClasses::Thread_klass(),
2868                           vmSymbols::run_method_name(),
2869                           vmSymbols::void_method_signature(),
2870                           THREAD);
2871 }
2872 
2873 
2874 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2875 #if INCLUDE_CDS
2876   if (CDSConfig::allow_only_single_java_thread()) {
2877     // During java -Xshare:dump, if we allow multiple Java threads to
2878     // execute in parallel, symbols and classes may be loaded in
2879     // random orders which will make the resulting CDS archive
2880     // non-deterministic.
2881     //
2882     // Lucikly, during java -Xshare:dump, it's important to run only
2883     // the code in the main Java thread (which is NOT started here) that
2884     // creates the module graph, etc. It's safe to not start the other
2885     // threads which are launched by class static initializers
2886     // (ReferenceHandler, FinalizerThread and CleanerImpl).
2887     if (log_is_enabled(Info, aot)) {
2888       ResourceMark rm;
2889       oop t = JNIHandles::resolve_non_null(jthread);
2890       log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2891     }
2892     return;
2893   }
2894 #endif
2895   JavaThread *native_thread = nullptr;
2896 
2897   // We cannot hold the Threads_lock when we throw an exception,
2898   // due to rank ordering issues. Example:  we might need to grab the
2899   // Heap_lock while we construct the exception.
2900   bool throw_illegal_thread_state = false;
2901 
2902   // We must release the Threads_lock before we can post a jvmti event
2903   // in Thread::start.
2904   {
2905     ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2906     // Ensure that the C++ Thread and OSThread structures aren't freed before
2907     // we operate.
2908     MutexLocker ml(Threads_lock);
2909 
2910     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2911     // re-starting an already started thread, so we should usually find
2912     // that the JavaThread is null. However for a JNI attached thread
2913     // there is a small window between the Thread object being created
2914     // (with its JavaThread set) and the update to its threadStatus, so we
2915     // have to check for this
2916     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2917       throw_illegal_thread_state = true;
2918     } else {
2919       jlong size =
2920              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2921       // Allocate the C++ Thread structure and create the native thread.  The
2922       // stack size retrieved from java is 64-bit signed, but the constructor takes
2923       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2924       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2925       //  - Avoid passing negative values which would result in really large stacks.
2926       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2927       size_t sz = size > 0 ? (size_t) size : 0;
2928       native_thread = new JavaThread(&thread_entry, sz);
2929 
2930       // At this point it may be possible that no osthread was created for the
2931       // JavaThread due to lack of memory. Check for this situation and throw
2932       // an exception if necessary. Eventually we may want to change this so
2933       // that we only grab the lock if the thread was created successfully -
2934       // then we can also do this check and throw the exception in the
2935       // JavaThread constructor.
2936       if (native_thread->osthread() != nullptr) {
2937         // Note: the current thread is not being used within "prepare".
2938         native_thread->prepare(jthread);
2939       }
2940     }
2941   }
2942 
2943   if (throw_illegal_thread_state) {
2944     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2945   }
2946 
2947   assert(native_thread != nullptr, "Starting null thread?");
2948 
2949   if (native_thread->osthread() == nullptr) {
2950     ResourceMark rm(thread);
2951     log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2952                             JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2953     // No one should hold a reference to the 'native_thread'.
2954     native_thread->smr_delete();
2955     if (JvmtiExport::should_post_resource_exhausted()) {
2956       JvmtiExport::post_resource_exhausted(
2957         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2958         os::native_thread_creation_failed_msg());
2959     }
2960     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2961               os::native_thread_creation_failed_msg());
2962   }
2963 
2964   JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2965 
2966   Thread::start(native_thread);
2967 
2968 JVM_END
2969 
2970 
2971 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2972   ThreadsListHandle tlh(thread);
2973   oop java_thread = nullptr;
2974   JavaThread* receiver = nullptr;
2975   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2976   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2977 
2978   if (is_alive) {
2979     // jthread refers to a live JavaThread.
2980     Thread::set_priority(receiver, (ThreadPriority)prio);
2981   }
2982   // Implied else: If the JavaThread hasn't started yet, then the
2983   // priority set in the java.lang.Thread object above will be pushed
2984   // down when it does start.
2985 JVM_END
2986 
2987 
2988 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2989   HOTSPOT_THREAD_YIELD();
2990   os::naked_yield();
2991 JVM_END
2992 
2993 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2994   if (nanos < 0) {
2995     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2996   }
2997 
2998   if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2999     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3000   }
3001 
3002   // Save current thread state and restore it at the end of this block.
3003   // And set new thread state to SLEEPING.
3004   JavaThreadSleepState jtss(thread);
3005 
3006   HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3007 
3008   if (nanos == 0) {
3009     os::naked_yield();
3010   } else {
3011     ThreadState old_state = thread->osthread()->get_state();
3012     thread->osthread()->set_state(SLEEPING);
3013     if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3014       // An asynchronous exception could have been thrown on
3015       // us while we were sleeping. We do not overwrite those.
3016       if (!HAS_PENDING_EXCEPTION) {
3017         HOTSPOT_THREAD_SLEEP_END(1);
3018         if (!thread->has_async_exception_condition()) {
3019           // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3020           // to properly restore the thread state.  That's likely wrong.
3021           THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3022         }
3023       }
3024     }
3025     thread->osthread()->set_state(old_state);
3026   }
3027   HOTSPOT_THREAD_SLEEP_END(0);
3028 JVM_END
3029 
3030 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3031   oop jthread = thread->threadObj();
3032   assert(jthread != nullptr, "no current carrier thread!");
3033   return JNIHandles::make_local(THREAD, jthread);
3034 JVM_END
3035 
3036 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3037   oop theThread = thread->vthread();
3038   assert(theThread != (oop)nullptr, "no current thread!");
3039   return JNIHandles::make_local(THREAD, theThread);
3040 JVM_END
3041 
3042 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3043                                      jobject theThread))
3044   oop threadObj = JNIHandles::resolve(theThread);
3045   thread->set_vthread(threadObj);
3046 
3047   // Set _monitor_owner_id of new current Thread
3048   thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3049 
3050   JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3051 JVM_END
3052 
3053 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3054   return ThreadIdentifier::unsafe_offset();
3055 JVM_END
3056 
3057 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3058   ThreadsListHandle tlh(thread);
3059   JavaThread* receiver = nullptr;
3060   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3061   if (is_alive) {
3062     // jthread refers to a live JavaThread.
3063     receiver->interrupt();
3064   }
3065 JVM_END
3066 
3067 // Return true iff the current thread has locked the object passed in
3068 
3069 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3070   if (obj == nullptr) {
3071     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3072   }
3073   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3074   return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3075 JVM_END
3076 
3077 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3078   oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3079   return JNIHandles::make_local(THREAD, trace);
3080 JVM_END
3081 
3082 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3083 #if INCLUDE_JVMTI
3084   oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3085   return JNIHandles::make_local(THREAD, snapshot);
3086 #else
3087   THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3088 #endif
3089 JVM_END
3090 
3091 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3092   // We don't use a ThreadsListHandle here because the current thread
3093   // must be alive.
3094   oop java_thread = JNIHandles::resolve_non_null(jthread);
3095   JavaThread* thr = java_lang_Thread::thread(java_thread);
3096   if (thread == thr && !thr->has_attached_via_jni()) {
3097     // Thread naming is only supported for the current thread and
3098     // we don't set the name of an attached thread to avoid stepping
3099     // on other programs.
3100     ResourceMark rm(thread);
3101     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3102     os::set_native_thread_name(thread_name);
3103   }
3104 JVM_END
3105 
3106 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3107   oop theCache = thread->scopedValueCache();
3108   return JNIHandles::make_local(THREAD, theCache);
3109 JVM_END
3110 
3111 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3112                                        jobject theCache))
3113   arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3114   thread->set_scopedValueCache(objs);
3115 JVM_END
3116 
3117 
3118 // java.lang.Package ////////////////////////////////////////////////////////////////
3119 
3120 
3121 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3122   ResourceMark rm(THREAD);
3123   JvmtiVMObjectAllocEventCollector oam;
3124   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3125   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3126 return (jstring) JNIHandles::make_local(THREAD, result);
3127 JVM_END
3128 
3129 
3130 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3131   JvmtiVMObjectAllocEventCollector oam;
3132   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3133   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3134 JVM_END
3135 
3136 
3137 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3138 
3139 
3140 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3141   MonitorLocker ml(Heap_lock);
3142   oop ref = Universe::reference_pending_list();
3143   if (ref != nullptr) {
3144     Universe::clear_reference_pending_list();
3145   }
3146   return JNIHandles::make_local(THREAD, ref);
3147 JVM_END
3148 
3149 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3150   MonitorLocker ml(Heap_lock);
3151   return Universe::has_reference_pending_list();
3152 JVM_END
3153 
3154 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3155   MonitorLocker ml(Heap_lock);
3156   while (!Universe::has_reference_pending_list()) {
3157     ml.wait();
3158   }
3159 JVM_END
3160 
3161 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3162   oop ref_oop = JNIHandles::resolve_non_null(ref);
3163   // PhantomReference has its own implementation of get().
3164   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3165   oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3166   return JNIHandles::make_local(THREAD, referent);
3167 JVM_END
3168 
3169 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3170   oop ref_oop = JNIHandles::resolve_non_null(ref);
3171   // PhantomReference has its own implementation of refersTo().
3172   // See: JVM_PhantomReferenceRefersTo
3173   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3174   oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3175   return referent == JNIHandles::resolve(o);
3176 JVM_END
3177 
3178 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3179   oop ref_oop = JNIHandles::resolve_non_null(ref);
3180   // FinalReference has it's own implementation of clear().
3181   assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3182   if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3183     // If the referent has already been cleared then done.
3184     // However, if the referent is dead but has not yet been cleared by
3185     // concurrent reference processing, it should NOT be cleared here.
3186     // Instead, clearing should be left to the GC.  Clearing it here could
3187     // detectably lose an expected notification, which is impossible with
3188     // STW reference processing.  The clearing in enqueue() doesn't have
3189     // this problem, since the enqueue covers the notification, but it's not
3190     // worth the effort to handle that case specially.
3191     return;
3192   }
3193   java_lang_ref_Reference::clear_referent(ref_oop);
3194 JVM_END
3195 
3196 
3197 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3198 
3199 
3200 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3201   oop ref_oop = JNIHandles::resolve_non_null(ref);
3202   oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3203   return referent == JNIHandles::resolve(o);
3204 JVM_END
3205 
3206 
3207 // ObjectInputStream ///////////////////////////////////////////////////////////////
3208 
3209 // Return the first user-defined class loader up the execution stack, or null
3210 // if only code from the bootstrap or platform class loader is on the stack.
3211 
3212 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3213   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3214     InstanceKlass* ik = vfst.method()->method_holder();
3215     oop loader = ik->class_loader();
3216     if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3217       return JNIHandles::make_local(THREAD, loader);
3218     }
3219   }
3220   return nullptr;
3221 JVM_END
3222 
3223 
3224 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3225 
3226 
3227 // resolve array handle and check arguments
3228 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3229   if (arr == nullptr) {
3230     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3231   }
3232   oop a = JNIHandles::resolve_non_null(arr);
3233   if (!a->is_array()) {
3234     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3235   } else if (type_array_only && !a->is_typeArray()) {
3236     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3237   }
3238   return arrayOop(a);
3239 }
3240 
3241 
3242 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3243   arrayOop a = check_array(env, arr, false, CHECK_0);
3244   return a->length();
3245 JVM_END
3246 
3247 
3248 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3249   JvmtiVMObjectAllocEventCollector oam;
3250   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3251   jvalue value;
3252   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3253   oop box = Reflection::box(&value, type, CHECK_NULL);
3254   return JNIHandles::make_local(THREAD, box);
3255 JVM_END
3256 
3257 
3258 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3259   jvalue value;
3260   value.i = 0; // to initialize value before getting used in CHECK
3261   arrayOop a = check_array(env, arr, true, CHECK_(value));
3262   assert(a->is_typeArray(), "just checking");
3263   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3264   BasicType wide_type = (BasicType) wCode;
3265   if (type != wide_type) {
3266     Reflection::widen(&value, type, wide_type, CHECK_(value));
3267   }
3268   return value;
3269 JVM_END
3270 
3271 
3272 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3273   arrayOop a = check_array(env, arr, false, CHECK);
3274   oop box = JNIHandles::resolve(val);
3275   jvalue value;
3276   value.i = 0; // to initialize value before getting used in CHECK
3277   BasicType value_type;
3278   if (a->is_objArray()) {
3279     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3280     value_type = Reflection::unbox_for_regular_object(box, &value);
3281   } else {
3282     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3283   }
3284   Reflection::array_set(&value, a, index, value_type, CHECK);
3285 JVM_END
3286 
3287 
3288 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3289   arrayOop a = check_array(env, arr, true, CHECK);
3290   assert(a->is_typeArray(), "just checking");
3291   BasicType value_type = (BasicType) vCode;
3292   Reflection::array_set(&v, a, index, value_type, CHECK);
3293 JVM_END
3294 
3295 
3296 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3297   JvmtiVMObjectAllocEventCollector oam;
3298   oop element_mirror = JNIHandles::resolve(eltClass);
3299   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3300   return JNIHandles::make_local(THREAD, result);
3301 JVM_END
3302 
3303 
3304 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3305   JvmtiVMObjectAllocEventCollector oam;
3306   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3307   oop element_mirror = JNIHandles::resolve(eltClass);
3308   assert(dim_array->is_typeArray(), "just checking");
3309   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3310   return JNIHandles::make_local(THREAD, result);
3311 JVM_END
3312 
3313 
3314 // Library support ///////////////////////////////////////////////////////////////////////////
3315 
3316 JVM_LEAF(void*, JVM_LoadZipLibrary())
3317   return ZipLibrary::handle();
3318 JVM_END
3319 
3320 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3321   //%note jvm_ct
3322   char ebuf[1024];
3323   void *load_result;
3324   {
3325     ThreadToNativeFromVM ttnfvm(thread);
3326     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3327   }
3328   if (load_result == nullptr) {
3329     if (throwException) {
3330       char msg[1024];
3331       jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3332       // Since 'ebuf' may contain a string encoded using
3333       // platform encoding scheme, we need to pass
3334       // Exceptions::unsafe_to_utf8 to the new_exception method
3335       // as the last argument. See bug 6367357.
3336       Handle h_exception =
3337         Exceptions::new_exception(thread,
3338                                   vmSymbols::java_lang_UnsatisfiedLinkError(),
3339                                   msg, Exceptions::unsafe_to_utf8);
3340 
3341       THROW_HANDLE_NULL(h_exception);
3342     } else {
3343       log_info(library)("Failed to load library %s", name);
3344       return load_result;
3345     }
3346   }
3347   log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3348   return load_result;
3349 JVM_END
3350 
3351 
3352 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3353   os::dll_unload(handle);
3354   log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3355 JVM_END
3356 
3357 
3358 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3359   void* find_result = os::dll_lookup(handle, name);
3360   log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3361                     find_result != nullptr ? "Found" : "Failed to find",
3362                     name, p2i(handle));
3363   return find_result;
3364 JVM_END
3365 
3366 
3367 // JNI version ///////////////////////////////////////////////////////////////////////////////
3368 
3369 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3370   return Threads::is_supported_jni_version_including_1_1(version);
3371 JVM_END
3372 
3373 
3374 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3375   return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3376 JVM_END
3377 
3378 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3379   return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3380 JVM_END
3381 
3382 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3383   return VMContinuations ? JNI_TRUE : JNI_FALSE;
3384 JVM_END
3385 
3386 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3387   return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3388 JVM_END
3389 
3390 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3391   return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3392 JVM_END
3393 
3394 // String support ///////////////////////////////////////////////////////////////////////////
3395 
3396 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3397   JvmtiVMObjectAllocEventCollector oam;
3398   if (str == nullptr) return nullptr;
3399   oop string = JNIHandles::resolve_non_null(str);
3400   oop result = StringTable::intern(string, CHECK_NULL);
3401   return (jstring) JNIHandles::make_local(THREAD, result);
3402 JVM_END
3403 
3404 
3405 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3406 
3407 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3408 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3409 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3410 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3411 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3412 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3413 
3414 
3415 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3416   VM_Exit::block_if_vm_exited();
3417   return new PlatformMutex();
3418 }
3419 
3420 
3421 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3422   VM_Exit::block_if_vm_exited();
3423   delete ((PlatformMutex*) mon);
3424 }
3425 
3426 
3427 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3428   VM_Exit::block_if_vm_exited();
3429   ((PlatformMutex*) mon)->lock();
3430   return 0;
3431 }
3432 
3433 
3434 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3435   VM_Exit::block_if_vm_exited();
3436   ((PlatformMutex*) mon)->unlock();
3437 }
3438 
3439 
3440 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3441 
3442 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3443                                     Handle loader, jboolean throwError, TRAPS) {
3444   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3445 
3446   // Check if we should initialize the class
3447   if (init && klass->is_instance_klass()) {
3448     klass->initialize(CHECK_NULL);
3449   }
3450   return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3451 }
3452 
3453 
3454 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3455 
3456 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3457   Handle method_handle;
3458   if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3459     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3460     Handle receiver(THREAD, JNIHandles::resolve(obj));
3461     objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3462     assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3463 
3464     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3465     jobject res = JNIHandles::make_local(THREAD, result);
3466     if (JvmtiExport::should_post_vm_object_alloc()) {
3467       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3468       assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3469       if (java_lang_Class::is_primitive(ret_type)) {
3470         // Only for primitive type vm allocates memory for java object.
3471         // See box() method.
3472         JvmtiExport::post_vm_object_alloc(thread, result);
3473       }
3474     }
3475     return res;
3476   } else {
3477     THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3478   }
3479 JVM_END
3480 
3481 
3482 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3483   objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3484   assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3485   oop constructor_mirror = JNIHandles::resolve(c);

3486   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3487   jobject res = JNIHandles::make_local(THREAD, result);
3488   if (JvmtiExport::should_post_vm_object_alloc()) {
3489     JvmtiExport::post_vm_object_alloc(thread, result);
3490   }
3491   return res;
3492 JVM_END
3493 
3494 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3495   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3496   HeapShared::initialize_from_archived_subgraph(THREAD, k);
3497 JVM_END
3498 
3499 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3500                                               jclass caller,
3501                                               jstring interfaceMethodName,
3502                                               jobject factoryType,
3503                                               jobject interfaceMethodType,
3504                                               jobject implementationMember,
3505                                               jobject dynamicMethodType,
3506                                               jclass lambdaProxyClass))
3507 #if INCLUDE_CDS
3508   if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3509     return;
3510   }
3511 
3512   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3513   if (caller_ik->is_hidden()) {
3514     // Hidden classes not of type lambda proxy classes are currently not being archived.
3515     // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3516     // registered for archiving.
3517     return;
3518   }
3519   InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3520   assert(lambda_ik->is_hidden(), "must be a hidden class");
3521   assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3522 
3523   Symbol* interface_method_name = nullptr;
3524   if (interfaceMethodName != nullptr) {
3525     interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3526   }
3527   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3528   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3529 
3530   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3531   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3532 
3533   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3534   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3535   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3536 
3537   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3538   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3539 
3540   LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3541                                                      interface_method_type, m, dynamic_method_type, THREAD);
3542 #endif // INCLUDE_CDS
3543 JVM_END
3544 
3545 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3546                                                         jclass caller,
3547                                                         jstring interfaceMethodName,
3548                                                         jobject factoryType,
3549                                                         jobject interfaceMethodType,
3550                                                         jobject implementationMember,
3551                                                         jobject dynamicMethodType))
3552 #if INCLUDE_CDS
3553 
3554   if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3555       implementationMember == nullptr || dynamicMethodType == nullptr) {
3556     THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3557   }
3558 
3559   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3560   if (!caller_ik->in_aot_cache()) {
3561     // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3562     return nullptr;
3563   }
3564 
3565   Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3566   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3567   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3568 
3569   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3570   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3571 
3572   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3573   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3574   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3575 
3576   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3577   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3578 
3579   InstanceKlass* loaded_lambda =
3580     LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3581                                                                interface_method_type, m, dynamic_method_type,
3582                                                                CHECK_(nullptr));
3583   return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3584 #else
3585   return nullptr;
3586 #endif // INCLUDE_CDS
3587 JVM_END
3588 
3589 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3590   if (CDSConfig::is_dumping_static_archive()) {
3591     // We do this so that the default CDS archive can be deterministic.
3592     const char* release = VM_Version::vm_release();
3593     const char* dbg_level = VM_Version::jdk_debug_level();
3594     const char* version = VM_Version::internal_vm_info_string();
3595     jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3596                          java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3597                          java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3598     seed += (jlong)VM_Version::vm_major_version();
3599     seed += (jlong)VM_Version::vm_minor_version();
3600     seed += (jlong)VM_Version::vm_security_version();
3601     seed += (jlong)VM_Version::vm_patch_version();
3602     if (seed == 0) { // don't let this ever be zero.
3603       seed = 0x87654321;
3604     }
3605     log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3606     return seed;
3607   } else {
3608     return 0;
3609   }
3610 JVM_END
3611 
3612 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3613   return CDSConfig::get_status();
3614 JVM_END
3615 
3616 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3617 #if INCLUDE_CDS
3618   assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3619   if (line != nullptr) {
3620     ResourceMark rm(THREAD);
3621     Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3622     char* c_line = java_lang_String::as_utf8_string(h_line());
3623     if (CDSConfig::is_dumping_dynamic_archive()) {
3624       // Note: LambdaFormInvokers::append take same format which is not
3625       // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3626       LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3627     }
3628     if (ClassListWriter::is_enabled()) {
3629       ClassListWriter w;
3630       w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3631     }
3632   }
3633 #endif // INCLUDE_CDS
3634 JVM_END
3635 
3636 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3637 #if INCLUDE_CDS
3638   ResourceMark rm(THREAD);
3639   Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3640   char* file_name  = java_lang_String::as_utf8_string(file_handle());
3641   AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3642 #endif // INCLUDE_CDS
3643 JVM_END
3644 
3645 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3646 #if INCLUDE_CDS
3647   ResourceMark rm(THREAD);
3648   Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3649   char* archive_name  = java_lang_String::as_utf8_string(file_handle());
3650   DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3651 #endif // INCLUDE_CDS
3652 JVM_END
3653 
3654 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3655 #if INCLUDE_CDS
3656   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3657   if (!k->is_instance_klass()) {
3658     return false;
3659   } else {
3660     if (InstanceKlass::cast(k)->is_enum_subclass() ||
3661         AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3662       // This class will be cached in AOT-initialized state. No need for init barriers.
3663       return false;
3664     } else {
3665       // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3666       // must emit barriers to ensure class initialization during production run.
3667       ResourceMark rm(THREAD);
3668       log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3669       return true;
3670     }
3671   }
3672 #else
3673   return false;
3674 #endif // INCLUDE_CDS
3675 JVM_END
3676 
3677 // Returns an array of all live Thread objects (VM internal JavaThreads,
3678 // jvmti agent threads, and JNI attaching threads  are skipped)
3679 // See CR 6404306 regarding JNI attaching threads
3680 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3681   ResourceMark rm(THREAD);
3682   ThreadsListEnumerator tle(THREAD, false, false);
3683   JvmtiVMObjectAllocEventCollector oam;
3684 
3685   int num_threads = tle.num_threads();
3686   objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3687   objArrayHandle threads_ah(THREAD, r);
3688 
3689   for (int i = 0; i < num_threads; i++) {
3690     Handle h = tle.get_threadObj(i);
3691     threads_ah->obj_at_put(i, h());
3692   }
3693 
3694   return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3695 JVM_END
3696 
3697 
3698 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3699 // Return StackTraceElement[][], each element is the stack trace of a thread in
3700 // the corresponding entry in the given threads array
3701 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3702   JvmtiVMObjectAllocEventCollector oam;
3703 
3704   // Check if threads is null
3705   if (threads == nullptr) {
3706     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3707   }
3708 
3709   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3710   objArrayHandle ah(THREAD, a);
3711   int num_threads = ah->length();
3712   // check if threads is non-empty array
3713   if (num_threads == 0) {
3714     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3715   }
3716 
3717   // check if threads is not an array of objects of Thread class
3718   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3719   if (k != vmClasses::Thread_klass()) {
3720     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3721   }
3722   refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3723 
3724   ResourceMark rm(THREAD);
3725 
3726   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3727   for (int i = 0; i < num_threads; i++) {
3728     oop thread_obj = rah->obj_at(i);
3729     instanceHandle h(THREAD, (instanceOop) thread_obj);
3730     thread_handle_array->append(h);
3731   }
3732 
3733   // The JavaThread references in thread_handle_array are validated
3734   // in VM_ThreadDump::doit().
3735   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3736   return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3737 
3738 JVM_END
3739 
3740 // JVM monitoring and management support
3741 JVM_LEAF(void*, JVM_GetManagement(jint version))
3742   return Management::get_jmm_interface(version);
3743 JVM_END
3744 
3745 // com.sun.tools.attach.VirtualMachine agent properties support
3746 //
3747 // Initialize the agent properties with the properties maintained in the VM
3748 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3749   ResourceMark rm;
3750 
3751   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3752 
3753   PUTPROP(props, "sun.java.command", Arguments::java_command());
3754   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3755   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3756   return properties;
3757 JVM_END
3758 
3759 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3760 {
3761   JvmtiVMObjectAllocEventCollector oam;
3762 
3763   if (ofClass == nullptr) {
3764     return nullptr;
3765   }
3766   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3767   // Special handling for primitive objects
3768   if (java_lang_Class::is_primitive(mirror())) {
3769     return nullptr;
3770   }
3771   Klass* k = java_lang_Class::as_Klass(mirror());
3772   if (!k->is_instance_klass()) {
3773     return nullptr;
3774   }
3775   InstanceKlass* ik = InstanceKlass::cast(k);
3776   int encl_method_class_idx = ik->enclosing_method_class_index();
3777   if (encl_method_class_idx == 0) {
3778     return nullptr;
3779   }
3780   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3781   objArrayHandle dest(THREAD, dest_o);
3782   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3783   dest->obj_at_put(0, enc_k->java_mirror());
3784   int encl_method_method_idx = ik->enclosing_method_method_index();
3785   if (encl_method_method_idx != 0) {
3786     Symbol* sym = ik->constants()->symbol_at(
3787                         extract_low_short_from_int(
3788                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3789     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3790     dest->obj_at_put(1, str());
3791     sym = ik->constants()->symbol_at(
3792               extract_high_short_from_int(
3793                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3794     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3795     dest->obj_at_put(2, str());
3796   }
3797   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3798 }
3799 JVM_END
3800 
3801 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3802 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3803   ResourceMark rm(THREAD);
3804 
3805   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3806     return nullptr;
3807   }
3808 
3809   char** vm_flags = Arguments::jvm_flags_array();
3810   char** vm_args = Arguments::jvm_args_array();
3811   int num_flags = Arguments::num_jvm_flags();
3812   int num_args = Arguments::num_jvm_args();
3813 
3814   InstanceKlass* ik = vmClasses::String_klass();
3815   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3816   objArrayHandle result_h(THREAD, r);
3817 
3818   int index = 0;
3819   for (int j = 0; j < num_flags; j++, index++) {
3820     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3821     result_h->obj_at_put(index, h());
3822   }
3823   for (int i = 0; i < num_args; i++, index++) {
3824     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3825     result_h->obj_at_put(index, h());
3826   }
3827   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3828 JVM_END
3829 
3830 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3831   return os::get_signal_number(name);
3832 JVM_END
3833 
3834 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3835 #if INCLUDE_JVMTI
3836   if (!DoJVMTIVirtualThreadTransitions) {
3837     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3838     return;
3839   }
3840   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3841     JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3842   } else {
3843     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3844     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3845   }
3846 #endif
3847 JVM_END
3848 
3849 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3850 #if INCLUDE_JVMTI
3851   if (!DoJVMTIVirtualThreadTransitions) {
3852     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3853     return;
3854   }
3855   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3856     JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3857   } else {
3858     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3859     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3860   }
3861 #endif
3862 JVM_END
3863 
3864 // If notifications are disabled then just update the VTMS transition bit and return.
3865 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3866 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3867 #if INCLUDE_JVMTI
3868   if (!DoJVMTIVirtualThreadTransitions) {
3869     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3870     return;
3871   }
3872   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3873     JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3874   } else {
3875     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3876     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3877   }
3878 #endif
3879 JVM_END
3880 
3881 // If notifications are disabled then just update the VTMS transition bit and return.
3882 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3883 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3884 #if INCLUDE_JVMTI
3885   if (!DoJVMTIVirtualThreadTransitions) {
3886     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3887     return;
3888   }
3889   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3890     JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3891   } else {
3892     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3893     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3894   }
3895 #endif
3896 JVM_END
3897 
3898 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3899 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3900 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3901 #if INCLUDE_JVMTI
3902   if (!DoJVMTIVirtualThreadTransitions) {
3903     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3904     return;
3905   }
3906   assert(thread->is_disable_suspend() != (bool)enter,
3907          "nested or unbalanced monitor enter/exit is not allowed");
3908   thread->toggle_is_disable_suspend();
3909 #endif
3910 JVM_END
3911 
3912 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3913 #if INCLUDE_JFR
3914   freeze_result result = THREAD->last_freeze_fail_result();
3915   assert(result != freeze_ok, "sanity check");
3916   EventVirtualThreadPinned event(UNTIMED);
3917   event.set_starttime(THREAD->last_freeze_fail_time());
3918   if (event.should_commit()) {
3919     ResourceMark rm(THREAD);
3920     const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3921     THREAD->post_vthread_pinned_event(&event, str, result);
3922   }
3923 #endif
3924 JVM_END
3925 
3926 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3927   ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3928   assert(parkEvent != nullptr, "not initialized");
3929 
3930   OopHandle& list_head = ObjectMonitor::vthread_list_head();
3931   oop vthread_head = nullptr;
3932   while (true) {
3933     if (list_head.peek() != nullptr) {
3934       for (;;) {
3935         oop head = list_head.resolve();
3936         if (list_head.cmpxchg(head, nullptr) == head) {
3937           return JNIHandles::make_local(THREAD, head);
3938         }
3939       }
3940     }
3941     ThreadBlockInVM tbivm(THREAD);
3942     parkEvent->park();
3943   }
3944 JVM_END
3945 /*
3946  * Return the current class's class file version.  The low order 16 bits of the
3947  * returned jint contain the class's major version.  The high order 16 bits
3948  * contain the class's minor version.
3949  */
3950 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3951   oop mirror = JNIHandles::resolve_non_null(current);
3952   if (java_lang_Class::is_primitive(mirror)) {
3953     // return latest major version and minor version of 0.
3954     return JVM_CLASSFILE_MAJOR_VERSION;
3955   }
3956   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3957   return (ik->minor_version() << 16) | ik->major_version();
3958 JVM_END
3959 
3960 /*
3961  * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3962  * get the value will see a materialized value and not a scalar-replaced
3963  * null value.
3964  */
3965 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3966   JVM_EnsureMaterializedForStackWalk(env, value);
3967 JVM_END
3968 
3969 /*
3970  * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3971  */
3972 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3973   return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3974 JVM_END
--- EOF ---