1 /*
   2  * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "jvm.h"
  27 #include "classfile/classFileStream.hpp"
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/classLoaderData.hpp"
  30 #include "classfile/classLoaderData.inline.hpp"
  31 #include "classfile/javaAssertions.hpp"
  32 #include "classfile/javaClasses.inline.hpp"
  33 #include "classfile/moduleEntry.hpp"
  34 #include "classfile/modules.hpp"
  35 #include "classfile/packageEntry.hpp"
  36 #include "classfile/stringTable.hpp"
  37 #include "classfile/symbolTable.hpp"
  38 #include "classfile/systemDictionary.hpp"
  39 #include "classfile/vmSymbols.hpp"
  40 #include "gc/shared/collectedHeap.inline.hpp"
  41 #include "interpreter/bytecode.hpp"
  42 #include "interpreter/bytecodeUtils.hpp"
  43 #include "jfr/jfrEvents.hpp"
  44 #include "logging/log.hpp"
  45 #include "memory/dynamicArchive.hpp"
  46 #include "memory/heapShared.hpp"
  47 #include "memory/oopFactory.hpp"
  48 #include "memory/referenceType.hpp"
  49 #include "memory/resourceArea.hpp"
  50 #include "memory/universe.hpp"
  51 #include "oops/access.inline.hpp"
  52 #include "oops/constantPool.hpp"
  53 #include "oops/fieldStreams.inline.hpp"
  54 #include "oops/instanceKlass.hpp"
  55 #include "oops/method.hpp"
  56 #include "oops/recordComponent.hpp"
  57 #include "oops/objArrayKlass.hpp"
  58 #include "oops/objArrayOop.inline.hpp"
  59 #include "oops/oop.inline.hpp"
  60 #include "prims/jvm_misc.hpp"
  61 #include "prims/jvmtiExport.hpp"
  62 #include "prims/jvmtiThreadState.hpp"
  63 #include "prims/nativeLookup.hpp"
  64 #include "prims/stackwalk.hpp"
  65 #include "runtime/arguments.hpp"
  66 #include "runtime/atomic.hpp"
  67 #include "runtime/handles.inline.hpp"
  68 #include "runtime/init.hpp"
  69 #include "runtime/interfaceSupport.inline.hpp"
  70 #include "runtime/deoptimization.hpp"
  71 #include "runtime/handshake.hpp"
  72 #include "runtime/java.hpp"
  73 #include "runtime/javaCalls.hpp"
  74 #include "runtime/jfieldIDWorkaround.hpp"
  75 #include "runtime/jniHandles.inline.hpp"
  76 #include "runtime/os.inline.hpp"
  77 #include "runtime/perfData.hpp"
  78 #include "runtime/reflection.hpp"
  79 #include "runtime/thread.inline.hpp"
  80 #include "runtime/threadSMR.hpp"
  81 #include "runtime/vframe.inline.hpp"
  82 #include "runtime/vmOperations.hpp"
  83 #include "runtime/vm_version.hpp"
  84 #include "services/attachListener.hpp"
  85 #include "services/management.hpp"
  86 #include "services/threadService.hpp"
  87 #include "utilities/copy.hpp"
  88 #include "utilities/defaultStream.hpp"
  89 #include "utilities/dtrace.hpp"
  90 #include "utilities/events.hpp"
  91 #include "utilities/histogram.hpp"
  92 #include "utilities/macros.hpp"
  93 #include "utilities/utf8.hpp"
  94 #if INCLUDE_CDS
  95 #include "classfile/systemDictionaryShared.hpp"
  96 #endif
  97 
  98 #include <errno.h>
  99 #include <jfr/recorder/jfrRecorder.hpp>
 100 
 101 /*
 102   NOTE about use of any ctor or function call that can trigger a safepoint/GC:
 103   such ctors and calls MUST NOT come between an oop declaration/init and its
 104   usage because if objects are move this may cause various memory stomps, bus
 105   errors and segfaults. Here is a cookbook for causing so called "naked oop
 106   failures":
 107 
 108       JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
 109           JVMWrapper("JVM_GetClassDeclaredFields");
 110 
 111           // Object address to be held directly in mirror & not visible to GC
 112           oop mirror = JNIHandles::resolve_non_null(ofClass);
 113 
 114           // If this ctor can hit a safepoint, moving objects around, then
 115           ComplexConstructor foo;
 116 
 117           // Boom! mirror may point to JUNK instead of the intended object
 118           (some dereference of mirror)
 119 
 120           // Here's another call that may block for GC, making mirror stale
 121           MutexLocker ml(some_lock);
 122 
 123           // And here's an initializer that can result in a stale oop
 124           // all in one step.
 125           oop o = call_that_can_throw_exception(TRAPS);
 126 
 127 
 128   The solution is to keep the oop declaration BELOW the ctor or function
 129   call that might cause a GC, do another resolve to reassign the oop, or
 130   consider use of a Handle instead of an oop so there is immunity from object
 131   motion. But note that the "QUICK" entries below do not have a handlemark
 132   and thus can only support use of handles passed in.
 133 */
 134 
 135 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
 136   ResourceMark rm;
 137   int line_number = -1;
 138   const char * source_file = NULL;
 139   const char * trace = "explicit";
 140   InstanceKlass* caller = NULL;
 141   JavaThread* jthread = JavaThread::current();
 142   if (jthread->has_last_Java_frame()) {
 143     vframeStream vfst(jthread);
 144 
 145     // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
 146     TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
 147     Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
 148     TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
 149     Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
 150 
 151     Method* last_caller = NULL;
 152 
 153     while (!vfst.at_end()) {
 154       Method* m = vfst.method();
 155       if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
 156           !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
 157           !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
 158         break;
 159       }
 160       last_caller = m;
 161       vfst.next();
 162     }
 163     // if this is called from Class.forName0 and that is called from Class.forName,
 164     // then print the caller of Class.forName.  If this is Class.loadClass, then print
 165     // that caller, otherwise keep quiet since this should be picked up elsewhere.
 166     bool found_it = false;
 167     if (!vfst.at_end() &&
 168         vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 169         vfst.method()->name() == vmSymbols::forName0_name()) {
 170       vfst.next();
 171       if (!vfst.at_end() &&
 172           vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 173           vfst.method()->name() == vmSymbols::forName_name()) {
 174         vfst.next();
 175         found_it = true;
 176       }
 177     } else if (last_caller != NULL &&
 178                last_caller->method_holder()->name() ==
 179                  vmSymbols::java_lang_ClassLoader() &&
 180                last_caller->name() == vmSymbols::loadClass_name()) {
 181       found_it = true;
 182     } else if (!vfst.at_end()) {
 183       if (vfst.method()->is_native()) {
 184         // JNI call
 185         found_it = true;
 186       }
 187     }
 188     if (found_it && !vfst.at_end()) {
 189       // found the caller
 190       caller = vfst.method()->method_holder();
 191       line_number = vfst.method()->line_number_from_bci(vfst.bci());
 192       if (line_number == -1) {
 193         // show method name if it's a native method
 194         trace = vfst.method()->name_and_sig_as_C_string();
 195       }
 196       Symbol* s = caller->source_file_name();
 197       if (s != NULL) {
 198         source_file = s->as_C_string();
 199       }
 200     }
 201   }
 202   if (caller != NULL) {
 203     if (to_class != caller) {
 204       const char * from = caller->external_name();
 205       const char * to = to_class->external_name();
 206       // print in a single call to reduce interleaving between threads
 207       if (source_file != NULL) {
 208         log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
 209       } else {
 210         log_debug(class, resolve)("%s %s (%s)", from, to, trace);
 211       }
 212     }
 213   }
 214 }
 215 
 216 void trace_class_resolution(Klass* to_class) {
 217   EXCEPTION_MARK;
 218   trace_class_resolution_impl(to_class, THREAD);
 219   if (HAS_PENDING_EXCEPTION) {
 220     CLEAR_PENDING_EXCEPTION;
 221   }
 222 }
 223 
 224 // Wrapper to trace JVM functions
 225 
 226 #ifdef ASSERT
 227   Histogram* JVMHistogram;
 228   volatile int JVMHistogram_lock = 0;
 229 
 230   class JVMHistogramElement : public HistogramElement {
 231     public:
 232      JVMHistogramElement(const char* name);
 233   };
 234 
 235   JVMHistogramElement::JVMHistogramElement(const char* elementName) {
 236     _name = elementName;
 237     uintx count = 0;
 238 
 239     while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
 240       while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
 241         count +=1;
 242         if ( (WarnOnStalledSpinLock > 0)
 243           && (count % WarnOnStalledSpinLock == 0)) {
 244           warning("JVMHistogram_lock seems to be stalled");
 245         }
 246       }
 247      }
 248 
 249     if(JVMHistogram == NULL)
 250       JVMHistogram = new Histogram("JVM Call Counts",100);
 251 
 252     JVMHistogram->add_element(this);
 253     Atomic::dec(&JVMHistogram_lock);
 254   }
 255 
 256   #define JVMCountWrapper(arg) \
 257       static JVMHistogramElement* e = new JVMHistogramElement(arg); \
 258       if (e != NULL) e->increment_count();  // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
 259 
 260   #define JVMWrapper(arg) JVMCountWrapper(arg);
 261 #else
 262   #define JVMWrapper(arg)
 263 #endif
 264 
 265 
 266 // Interface version /////////////////////////////////////////////////////////////////////
 267 
 268 
 269 JVM_LEAF(jint, JVM_GetInterfaceVersion())
 270   return JVM_INTERFACE_VERSION;
 271 JVM_END
 272 
 273 
 274 // java.lang.System //////////////////////////////////////////////////////////////////////
 275 
 276 
 277 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
 278   JVMWrapper("JVM_CurrentTimeMillis");
 279   return os::javaTimeMillis();
 280 JVM_END
 281 
 282 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
 283   JVMWrapper("JVM_NanoTime");
 284   return os::javaTimeNanos();
 285 JVM_END
 286 
 287 // The function below is actually exposed by jdk.internal.misc.VM and not
 288 // java.lang.System, but we choose to keep it here so that it stays next
 289 // to JVM_CurrentTimeMillis and JVM_NanoTime
 290 
 291 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); //  2^32
 292 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
 293 
 294 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
 295   JVMWrapper("JVM_GetNanoTimeAdjustment");
 296   jlong seconds;
 297   jlong nanos;
 298 
 299   os::javaTimeSystemUTC(seconds, nanos);
 300 
 301   // We're going to verify that the result can fit in a long.
 302   // For that we need the difference in seconds between 'seconds'
 303   // and 'offset_secs' to be such that:
 304   //     |seconds - offset_secs| < (2^63/10^9)
 305   // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
 306   // which makes |seconds - offset_secs| < 2^33
 307   // and we will prefer +/- 2^32 as the maximum acceptable diff
 308   // as 2^32 has a more natural feel than 2^33...
 309   //
 310   // So if |seconds - offset_secs| >= 2^32 - we return a special
 311   // sentinel value (-1) which the caller should take as an
 312   // exception value indicating that the offset given to us is
 313   // too far from range of the current time - leading to too big
 314   // a nano adjustment. The caller is expected to recover by
 315   // computing a more accurate offset and calling this method
 316   // again. (For the record 2^32 secs is ~136 years, so that
 317   // should rarely happen)
 318   //
 319   jlong diff = seconds - offset_secs;
 320   if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
 321      return -1; // sentinel value: the offset is too far off the target
 322   }
 323 
 324   // return the adjustment. If you compute a time by adding
 325   // this number of nanoseconds along with the number of seconds
 326   // in the offset you should get the current UTC time.
 327   return (diff * (jlong)1000000000) + nanos;
 328 JVM_END
 329 
 330 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
 331                                jobject dst, jint dst_pos, jint length))
 332   JVMWrapper("JVM_ArrayCopy");
 333   // Check if we have null pointers
 334   if (src == NULL || dst == NULL) {
 335     THROW(vmSymbols::java_lang_NullPointerException());
 336   }
 337   arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
 338   arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
 339   assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
 340   assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
 341   // Do copy
 342   s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
 343 JVM_END
 344 
 345 
 346 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
 347   JavaValue r(T_OBJECT);
 348   // public synchronized Object put(Object key, Object value);
 349   HandleMark hm(THREAD);
 350   Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK);
 351   Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
 352   JavaCalls::call_virtual(&r,
 353                           props,
 354                           SystemDictionary::Properties_klass(),
 355                           vmSymbols::put_name(),
 356                           vmSymbols::object_object_object_signature(),
 357                           key_str,
 358                           value_str,
 359                           THREAD);
 360 }
 361 
 362 
 363 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
 364 
 365 /*
 366  * Return all of the system properties in a Java String array with alternating
 367  * names and values from the jvm SystemProperty.
 368  * Which includes some internal and all commandline -D defined properties.
 369  */
 370 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
 371   JVMWrapper("JVM_GetProperties");
 372   ResourceMark rm(THREAD);
 373   HandleMark hm(THREAD);
 374   int ndx = 0;
 375   int fixedCount = 2;
 376 
 377   SystemProperty* p = Arguments::system_properties();
 378   int count = Arguments::PropertyList_count(p);
 379 
 380   // Allocate result String array
 381   InstanceKlass* ik = SystemDictionary::String_klass();
 382   objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
 383   objArrayHandle result_h(THREAD, r);
 384 
 385   while (p != NULL) {
 386     const char * key = p->key();
 387     if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
 388         const char * value = p->value();
 389         Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
 390         Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
 391         result_h->obj_at_put(ndx * 2,  key_str());
 392         result_h->obj_at_put(ndx * 2 + 1, value_str());
 393         ndx++;
 394     }
 395     p = p->next();
 396   }
 397 
 398   // Convert the -XX:MaxDirectMemorySize= command line flag
 399   // to the sun.nio.MaxDirectMemorySize property.
 400   // Do this after setting user properties to prevent people
 401   // from setting the value with a -D option, as requested.
 402   // Leave empty if not supplied
 403   if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
 404     char as_chars[256];
 405     jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
 406     Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
 407     Handle value_str  = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
 408     result_h->obj_at_put(ndx * 2,  key_str());
 409     result_h->obj_at_put(ndx * 2 + 1, value_str());
 410     ndx++;
 411   }
 412 
 413   // JVM monitoring and management support
 414   // Add the sun.management.compiler property for the compiler's name
 415   {
 416 #undef CSIZE
 417 #if defined(_LP64) || defined(_WIN64)
 418   #define CSIZE "64-Bit "
 419 #else
 420   #define CSIZE
 421 #endif // 64bit
 422 
 423 #ifdef TIERED
 424     const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
 425 #else
 426 #if defined(COMPILER1)
 427     const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
 428 #elif defined(COMPILER2)
 429     const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
 430 #elif INCLUDE_JVMCI
 431     #error "INCLUDE_JVMCI should imply TIERED"
 432 #else
 433     const char* compiler_name = "";
 434 #endif // compilers
 435 #endif // TIERED
 436 
 437     if (*compiler_name != '\0' &&
 438         (Arguments::mode() != Arguments::_int)) {
 439       Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
 440       Handle value_str  = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
 441       result_h->obj_at_put(ndx * 2,  key_str());
 442       result_h->obj_at_put(ndx * 2 + 1, value_str());
 443       ndx++;
 444     }
 445   }
 446 
 447   return (jobjectArray) JNIHandles::make_local(env, result_h());
 448 JVM_END
 449 
 450 
 451 /*
 452  * Return the temporary directory that the VM uses for the attach
 453  * and perf data files.
 454  *
 455  * It is important that this directory is well-known and the
 456  * same for all VM instances. It cannot be affected by configuration
 457  * variables such as java.io.tmpdir.
 458  */
 459 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 460   JVMWrapper("JVM_GetTemporaryDirectory");
 461   HandleMark hm(THREAD);
 462   const char* temp_dir = os::get_temp_directory();
 463   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 464   return (jstring) JNIHandles::make_local(env, h());
 465 JVM_END
 466 
 467 
 468 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 469 
 470 extern volatile jint vm_created;
 471 
 472 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
 473   JVMWrapper("JVM_BeforeHalt");
 474   // Link all classes for dynamic CDS dumping before vm exit.
 475   if (DynamicDumpSharedSpaces) {
 476     MetaspaceShared::link_and_cleanup_shared_classes(THREAD);
 477   }
 478   EventShutdown event;
 479   if (event.should_commit()) {
 480     event.set_reason("Shutdown requested from Java");
 481     event.commit();
 482   }
 483 JVM_END
 484 
 485 
 486 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 487   before_exit(thread);
 488   vm_exit(code);
 489 JVM_END
 490 
 491 
 492 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 493   JVMWrapper("JVM_GC");
 494   if (!DisableExplicitGC) {
 495     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 496   }
 497 JVM_END
 498 
 499 
 500 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 501   JVMWrapper("JVM_MaxObjectInspectionAge");
 502   return Universe::heap()->millis_since_last_gc();
 503 JVM_END
 504 
 505 
 506 static inline jlong convert_size_t_to_jlong(size_t val) {
 507   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 508   NOT_LP64 (return (jlong)val;)
 509   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 510 }
 511 
 512 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 513   JVMWrapper("JVM_TotalMemory");
 514   size_t n = Universe::heap()->capacity();
 515   return convert_size_t_to_jlong(n);
 516 JVM_END
 517 
 518 
 519 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 520   JVMWrapper("JVM_FreeMemory");
 521   size_t n = Universe::heap()->unused();
 522   return convert_size_t_to_jlong(n);
 523 JVM_END
 524 
 525 
 526 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 527   JVMWrapper("JVM_MaxMemory");
 528   size_t n = Universe::heap()->max_capacity();
 529   return convert_size_t_to_jlong(n);
 530 JVM_END
 531 
 532 
 533 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 534   JVMWrapper("JVM_ActiveProcessorCount");
 535   return os::active_processor_count();
 536 JVM_END
 537 
 538 
 539 
 540 // java.lang.Throwable //////////////////////////////////////////////////////
 541 
 542 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 543   JVMWrapper("JVM_FillInStackTrace");
 544   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 545   java_lang_Throwable::fill_in_stack_trace(exception);
 546 JVM_END
 547 
 548 // java.lang.NullPointerException ///////////////////////////////////////////
 549 
 550 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
 551   if (!ShowCodeDetailsInExceptionMessages) return NULL;
 552 
 553   oop exc = JNIHandles::resolve_non_null(throwable);
 554 
 555   Method* method;
 556   int bci;
 557   if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
 558     return NULL;
 559   }
 560   if (method->is_native()) {
 561     return NULL;
 562   }
 563 
 564   stringStream ss;
 565   bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
 566   if (ok) {
 567     oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
 568     return (jstring) JNIHandles::make_local(env, result);
 569   } else {
 570     return NULL;
 571   }
 572 JVM_END
 573 
 574 // java.lang.StackTraceElement //////////////////////////////////////////////
 575 
 576 
 577 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
 578   JVMWrapper("JVM_InitStackTraceElementArray");
 579   Handle exception(THREAD, JNIHandles::resolve(throwable));
 580   objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
 581   objArrayHandle stack_trace(THREAD, st);
 582   // Fill in the allocated stack trace
 583   java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
 584 JVM_END
 585 
 586 
 587 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 588   JVMWrapper("JVM_InitStackTraceElement");
 589   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 590   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 591   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
 592 JVM_END
 593 
 594 
 595 // java.lang.StackWalker //////////////////////////////////////////////////////
 596 
 597 
 598 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
 599                                      jint skip_frames, jint frame_count, jint start_index,
 600                                      jobjectArray frames))
 601   JVMWrapper("JVM_CallStackWalk");
 602   JavaThread* jt = (JavaThread*) THREAD;
 603   if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
 604     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
 605   }
 606 
 607   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 608 
 609   // frames array is a Class<?>[] array when only getting caller reference,
 610   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 611   // be null.
 612   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 613   objArrayHandle frames_array_h(THREAD, fa);
 614 
 615   int limit = start_index + frame_count;
 616   if (frames_array_h->length() < limit) {
 617     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
 618   }
 619 
 620   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
 621                                start_index, frames_array_h, CHECK_NULL);
 622   return JNIHandles::make_local(env, result);
 623 JVM_END
 624 
 625 
 626 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
 627                                   jint frame_count, jint start_index,
 628                                   jobjectArray frames))
 629   JVMWrapper("JVM_MoreStackWalk");
 630   JavaThread* jt = (JavaThread*) THREAD;
 631 
 632   // frames array is a Class<?>[] array when only getting caller reference,
 633   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 634   // be null.
 635   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 636   objArrayHandle frames_array_h(THREAD, fa);
 637 
 638   int limit = start_index+frame_count;
 639   if (frames_array_h->length() < limit) {
 640     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 641   }
 642 
 643   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 644   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
 645                                    start_index, frames_array_h, THREAD);
 646 JVM_END
 647 
 648 // java.lang.Object ///////////////////////////////////////////////
 649 
 650 
 651 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 652   JVMWrapper("JVM_IHashCode");
 653   // as implemented in the classic virtual machine; return 0 if object is NULL
 654   return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
 655 JVM_END
 656 
 657 
 658 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 659   JVMWrapper("JVM_MonitorWait");
 660   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 661   JavaThreadInObjectWaitState jtiows(thread, ms != 0);
 662   if (JvmtiExport::should_post_monitor_wait()) {
 663     JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
 664 
 665     // The current thread already owns the monitor and it has not yet
 666     // been added to the wait queue so the current thread cannot be
 667     // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
 668     // event handler cannot accidentally consume an unpark() meant for
 669     // the ParkEvent associated with this ObjectMonitor.
 670   }
 671   ObjectSynchronizer::wait(obj, ms, CHECK);
 672 JVM_END
 673 
 674 
 675 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 676   JVMWrapper("JVM_MonitorNotify");
 677   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 678   ObjectSynchronizer::notify(obj, CHECK);
 679 JVM_END
 680 
 681 
 682 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 683   JVMWrapper("JVM_MonitorNotifyAll");
 684   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 685   ObjectSynchronizer::notifyall(obj, CHECK);
 686 JVM_END
 687 
 688 
 689 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 690   JVMWrapper("JVM_Clone");
 691   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 692   Klass* klass = obj->klass();
 693   JvmtiVMObjectAllocEventCollector oam;
 694 
 695 #ifdef ASSERT
 696   // Just checking that the cloneable flag is set correct
 697   if (obj->is_array()) {
 698     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 699   } else {
 700     guarantee(obj->is_instance(), "should be instanceOop");
 701     bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
 702     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 703   }
 704 #endif
 705 
 706   // Check if class of obj supports the Cloneable interface.
 707   // All arrays are considered to be cloneable (See JLS 20.1.5).
 708   // All j.l.r.Reference classes are considered non-cloneable.
 709   if (!klass->is_cloneable() ||
 710       (klass->is_instance_klass() &&
 711        InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
 712     ResourceMark rm(THREAD);
 713     THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 714   }
 715 
 716   // Make shallow object copy
 717   const int size = obj->size();
 718   oop new_obj_oop = NULL;
 719   if (obj->is_array()) {
 720     const int length = ((arrayOop)obj())->length();
 721     new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
 722                                                    /* do_zero */ true, CHECK_NULL);
 723   } else {
 724     new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
 725   }
 726 
 727   HeapAccess<>::clone(obj(), new_obj_oop, size);
 728 
 729   Handle new_obj(THREAD, new_obj_oop);
 730   // Caution: this involves a java upcall, so the clone should be
 731   // "gc-robust" by this stage.
 732   if (klass->has_finalizer()) {
 733     assert(obj->is_instance(), "should be instanceOop");
 734     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 735     new_obj = Handle(THREAD, new_obj_oop);
 736   }
 737 
 738   return JNIHandles::make_local(env, new_obj());
 739 JVM_END
 740 
 741 // java.io.File ///////////////////////////////////////////////////////////////
 742 
 743 JVM_LEAF(char*, JVM_NativePath(char* path))
 744   JVMWrapper("JVM_NativePath");
 745   return os::native_path(path);
 746 JVM_END
 747 
 748 
 749 // Misc. class handling ///////////////////////////////////////////////////////////
 750 
 751 
 752 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
 753   JVMWrapper("JVM_GetCallerClass");
 754 
 755   // Getting the class of the caller frame.
 756   //
 757   // The call stack at this point looks something like this:
 758   //
 759   // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
 760   // [1] [ @CallerSensitive API.method                                   ]
 761   // [.] [ (skipped intermediate frames)                                 ]
 762   // [n] [ caller                                                        ]
 763   vframeStream vfst(thread);
 764   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 765   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 766     Method* m = vfst.method();
 767     assert(m != NULL, "sanity");
 768     switch (n) {
 769     case 0:
 770       // This must only be called from Reflection.getCallerClass
 771       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 772         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 773       }
 774       // fall-through
 775     case 1:
 776       // Frame 0 and 1 must be caller sensitive.
 777       if (!m->caller_sensitive()) {
 778         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 779       }
 780       break;
 781     default:
 782       if (!m->is_ignored_by_security_stack_walk()) {
 783         // We have reached the desired frame; return the holder class.
 784         return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
 785       }
 786       break;
 787     }
 788   }
 789   return NULL;
 790 JVM_END
 791 
 792 
 793 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 794   JVMWrapper("JVM_FindPrimitiveClass");
 795   oop mirror = NULL;
 796   BasicType t = name2type(utf);
 797   if (t != T_ILLEGAL && !is_reference_type(t)) {
 798     mirror = Universe::java_mirror(t);
 799   }
 800   if (mirror == NULL) {
 801     THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 802   } else {
 803     return (jclass) JNIHandles::make_local(env, mirror);
 804   }
 805 JVM_END
 806 
 807 
 808 // Returns a class loaded by the bootstrap class loader; or null
 809 // if not found.  ClassNotFoundException is not thrown.
 810 // FindClassFromBootLoader is exported to the launcher for windows.
 811 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 812                                               const char* name))
 813   JVMWrapper("JVM_FindClassFromBootLoader");
 814 
 815   // Java libraries should ensure that name is never null or illegal.
 816   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 817     // It's impossible to create this class;  the name cannot fit
 818     // into the constant pool.
 819     return NULL;
 820   }
 821   assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
 822 
 823   TempNewSymbol h_name = SymbolTable::new_symbol(name);
 824   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 825   if (k == NULL) {
 826     return NULL;
 827   }
 828 
 829   if (log_is_enabled(Debug, class, resolve)) {
 830     trace_class_resolution(k);
 831   }
 832   return (jclass) JNIHandles::make_local(env, k->java_mirror());
 833 JVM_END
 834 
 835 // Find a class with this name in this loader, using the caller's protection domain.
 836 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
 837                                           jboolean init, jobject loader,
 838                                           jclass caller))
 839   JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
 840 
 841   TempNewSymbol h_name =
 842        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 843                                            CHECK_NULL);
 844 
 845   oop loader_oop = JNIHandles::resolve(loader);
 846   oop from_class = JNIHandles::resolve(caller);
 847   oop protection_domain = NULL;
 848   // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
 849   // NPE. Put it in another way, the bootstrap class loader has all permission and
 850   // thus no checkPackageAccess equivalence in the VM class loader.
 851   // The caller is also passed as NULL by the java code if there is no security
 852   // manager to avoid the performance cost of getting the calling class.
 853   if (from_class != NULL && loader_oop != NULL) {
 854     protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
 855   }
 856 
 857   Handle h_loader(THREAD, loader_oop);
 858   Handle h_prot(THREAD, protection_domain);
 859   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 860                                                h_prot, false, THREAD);
 861 
 862   if (log_is_enabled(Debug, class, resolve) && result != NULL) {
 863     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 864   }
 865   return result;
 866 JVM_END
 867 
 868 // Currently only called from the old verifier.
 869 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 870                                          jboolean init, jclass from))
 871   JVMWrapper("JVM_FindClassFromClass");
 872   TempNewSymbol h_name =
 873        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 874                                            CHECK_NULL);
 875   oop from_class_oop = JNIHandles::resolve(from);
 876   Klass* from_class = (from_class_oop == NULL)
 877                            ? (Klass*)NULL
 878                            : java_lang_Class::as_Klass(from_class_oop);
 879   oop class_loader = NULL;
 880   oop protection_domain = NULL;
 881   if (from_class != NULL) {
 882     class_loader = from_class->class_loader();
 883     protection_domain = from_class->protection_domain();
 884   }
 885   Handle h_loader(THREAD, class_loader);
 886   Handle h_prot  (THREAD, protection_domain);
 887   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 888                                                h_prot, true, thread);
 889 
 890   if (log_is_enabled(Debug, class, resolve) && result != NULL) {
 891     // this function is generally only used for class loading during verification.
 892     ResourceMark rm;
 893     oop from_mirror = JNIHandles::resolve_non_null(from);
 894     Klass* from_class = java_lang_Class::as_Klass(from_mirror);
 895     const char * from_name = from_class->external_name();
 896 
 897     oop mirror = JNIHandles::resolve_non_null(result);
 898     Klass* to_class = java_lang_Class::as_Klass(mirror);
 899     const char * to = to_class->external_name();
 900     log_debug(class, resolve)("%s %s (verification)", from_name, to);
 901   }
 902 
 903   return result;
 904 JVM_END
 905 
 906 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
 907   if (loader.is_null()) {
 908     return;
 909   }
 910 
 911   // check whether the current caller thread holds the lock or not.
 912   // If not, increment the corresponding counter
 913   if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
 914       ObjectSynchronizer::owner_self) {
 915     counter->inc();
 916   }
 917 }
 918 
 919 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
 920 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
 921                                       jobject loader, const jbyte *buf,
 922                                       jsize len, jobject pd, const char *source,
 923                                       TRAPS) {
 924   if (source == NULL)  source = "__JVM_DefineClass__";
 925 
 926   assert(THREAD->is_Java_thread(), "must be a JavaThread");
 927   JavaThread* jt = (JavaThread*) THREAD;
 928 
 929   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
 930                              ClassLoader::perf_define_appclass_selftime(),
 931                              ClassLoader::perf_define_appclasses(),
 932                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 933                              jt->get_thread_stat()->perf_timers_addr(),
 934                              PerfClassTraceTime::DEFINE_CLASS);
 935 
 936   if (UsePerfData) {
 937     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
 938   }
 939 
 940   // Class resolution will get the class name from the .class stream if the name is null.
 941   TempNewSymbol class_name = name == NULL ? NULL :
 942        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
 943                                            CHECK_NULL);
 944 
 945   ResourceMark rm(THREAD);
 946   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
 947   Handle class_loader (THREAD, JNIHandles::resolve(loader));
 948   if (UsePerfData) {
 949     is_lock_held_by_thread(class_loader,
 950                            ClassLoader::sync_JVMDefineClassLockFreeCounter(),
 951                            THREAD);
 952   }
 953   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
 954   Klass* k = SystemDictionary::resolve_from_stream(class_name,
 955                                                    class_loader,
 956                                                    protection_domain,
 957                                                    &st,
 958                                                    CHECK_NULL);
 959 
 960   if (log_is_enabled(Debug, class, resolve) && k != NULL) {
 961     trace_class_resolution(k);
 962   }
 963 
 964   return (jclass) JNIHandles::make_local(env, k->java_mirror());
 965 }
 966 
 967 enum {
 968   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
 969   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
 970   STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
 971   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
 972 };
 973 
 974 /*
 975  * Define a class with the specified flags that indicates if it's a nestmate,
 976  * hidden, or strongly referenced from class loader.
 977  */
 978 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name,
 979                                       const jbyte *buf, jsize len, jobject pd,
 980                                       jboolean init, int flags, jobject classData, TRAPS) {
 981   assert(THREAD->is_Java_thread(), "must be a JavaThread");
 982   JavaThread* jt = (JavaThread*) THREAD;
 983   ResourceMark rm(THREAD);
 984 
 985   Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
 986   // Lookup class must be a non-null instance
 987   if (lookup_k == NULL) {
 988     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
 989   }
 990   assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
 991 
 992   Handle class_loader (THREAD, lookup_k->class_loader());
 993 
 994   bool is_nestmate = (flags & NESTMATE) == NESTMATE;
 995   bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
 996   bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
 997   bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
 998 
 999   InstanceKlass* host_class = NULL;
1000   if (is_nestmate) {
1001     host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1002   }
1003 
1004   log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1005                              name,
1006                              is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1007                              is_nestmate ? host_class->external_name() : "",
1008                              is_hidden ? "hidden" : "not hidden",
1009                              is_strong ? "strong" : "weak",
1010                              vm_annotations ? "with vm annotations" : "without vm annotation");
1011 
1012   if (!is_hidden) {
1013     // classData is only applicable for hidden classes
1014     if (classData != NULL) {
1015       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1016     }
1017     if (is_nestmate) {
1018       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1019     }
1020     if (!is_strong) {
1021       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1022     }
1023     if (vm_annotations) {
1024       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1025     }
1026     if (flags != STRONG_LOADER_LINK) {
1027       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1028                   err_msg("invalid flag 0x%x", flags));
1029     }
1030   }
1031 
1032   // Class resolution will get the class name from the .class stream if the name is null.
1033   TempNewSymbol class_name = name == NULL ? NULL :
1034        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1035                                            CHECK_NULL);
1036 
1037   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1038   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1039   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1040 
1041   Klass* defined_k;
1042   InstanceKlass* ik = NULL;
1043   if (!is_hidden) {
1044     defined_k = SystemDictionary::resolve_from_stream(class_name,
1045                                                       class_loader,
1046                                                       protection_domain,
1047                                                       &st,
1048                                                       CHECK_NULL);
1049 
1050     if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) {
1051       trace_class_resolution(defined_k);
1052     }
1053     ik = InstanceKlass::cast(defined_k);
1054   } else { // hidden
1055     Handle classData_h(THREAD, JNIHandles::resolve(classData));
1056     ClassLoadInfo cl_info(protection_domain,
1057                           NULL, // unsafe_anonymous_host
1058                           NULL, // cp_patches
1059                           host_class,
1060                           classData_h,
1061                           is_hidden,
1062                           is_strong,
1063                           vm_annotations);
1064     defined_k = SystemDictionary::parse_stream(class_name,
1065                                                class_loader,
1066                                                &st,
1067                                                cl_info,
1068                                                CHECK_NULL);
1069     if (defined_k == NULL) {
1070       THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class");
1071     }
1072 
1073     ik = InstanceKlass::cast(defined_k);
1074 
1075     // The hidden class loader data has been artificially been kept alive to
1076     // this point. The mirror and any instances of this class have to keep
1077     // it alive afterwards.
1078     ik->class_loader_data()->dec_keep_alive();
1079 
1080     if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1081       ModuleEntry* module = ik->module();
1082       const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1083       log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1084                                   module_name,
1085                                   ik->external_name(),
1086                                   host_class->external_name(),
1087                                   ik->is_hidden() ? "is hidden" : "is not hidden");
1088     }
1089   }
1090   assert(Reflection::is_same_class_package(lookup_k, defined_k),
1091          "lookup class and defined class are in different packages");
1092 
1093   if (init) {
1094     ik->initialize(CHECK_NULL);
1095   } else {
1096     ik->link_class(CHECK_NULL);
1097   }
1098 
1099   return (jclass) JNIHandles::make_local(env, defined_k->java_mirror());
1100 }
1101 
1102 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1103   JVMWrapper("JVM_DefineClass");
1104 
1105   return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
1106 JVM_END
1107 
1108 /*
1109  * Define a class with the specified lookup class.
1110  *  lookup:  Lookup class
1111  *  name:    the name of the class
1112  *  buf:     class bytes
1113  *  len:     length of class bytes
1114  *  pd:      protection domain
1115  *  init:    initialize the class
1116  *  flags:   properties of the class
1117  *  classData: private static pre-initialized field
1118  */
1119 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1120           jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1121   JVMWrapper("JVM_LookupDefineClass");
1122 
1123   if (lookup == NULL) {
1124     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1125   }
1126 
1127   assert(buf != NULL, "buf must not be NULL");
1128 
1129   return jvm_lookup_define_class(env, lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1130 JVM_END
1131 
1132 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1133   JVMWrapper("JVM_DefineClassWithSource");
1134 
1135   return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1136 JVM_END
1137 
1138 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1139   JVMWrapper("JVM_FindLoadedClass");
1140   ResourceMark rm(THREAD);
1141 
1142   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1143   char* str = java_lang_String::as_utf8_string(h_name());
1144 
1145   // Sanity check, don't expect null
1146   if (str == NULL) return NULL;
1147 
1148   // Internalize the string, converting '.' to '/' in string.
1149   char* p = (char*)str;
1150   while (*p != '\0') {
1151       if (*p == '.') {
1152           *p = '/';
1153       }
1154       p++;
1155   }
1156 
1157   const int str_len = (int)(p - str);
1158   if (str_len > Symbol::max_length()) {
1159     // It's impossible to create this class;  the name cannot fit
1160     // into the constant pool.
1161     return NULL;
1162   }
1163   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1164 
1165   // Security Note:
1166   //   The Java level wrapper will perform the necessary security check allowing
1167   //   us to pass the NULL as the initiating class loader.
1168   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1169   if (UsePerfData) {
1170     is_lock_held_by_thread(h_loader,
1171                            ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1172                            THREAD);
1173   }
1174 
1175   Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1176                                                               h_loader,
1177                                                               Handle(),
1178                                                               CHECK_NULL);
1179 #if INCLUDE_CDS
1180   if (k == NULL) {
1181     // If the class is not already loaded, try to see if it's in the shared
1182     // archive for the current classloader (h_loader).
1183     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1184   }
1185 #endif
1186   return (k == NULL) ? NULL :
1187             (jclass) JNIHandles::make_local(env, k->java_mirror());
1188 JVM_END
1189 
1190 // Module support //////////////////////////////////////////////////////////////////////////////
1191 
1192 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1193                                  jstring location, jobjectArray packages))
1194   JVMWrapper("JVM_DefineModule");
1195   Modules::define_module(module, is_open, version, location, packages, CHECK);
1196 JVM_END
1197 
1198 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1199   JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1200   Modules::set_bootloader_unnamed_module(module, CHECK);
1201 JVM_END
1202 
1203 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1204   JVMWrapper("JVM_AddModuleExports");
1205   Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1206 JVM_END
1207 
1208 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1209   JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1210   Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1211 JVM_END
1212 
1213 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1214   JVMWrapper("JVM_AddModuleExportsToAll");
1215   Modules::add_module_exports(from_module, package, NULL, CHECK);
1216 JVM_END
1217 
1218 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1219   JVMWrapper("JVM_AddReadsModule");
1220   Modules::add_reads_module(from_module, source_module, CHECK);
1221 JVM_END
1222 
1223 // Reflection support //////////////////////////////////////////////////////////////////////////////
1224 
1225 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1226   assert (cls != NULL, "illegal class");
1227   JVMWrapper("JVM_InitClassName");
1228   JvmtiVMObjectAllocEventCollector oam;
1229   ResourceMark rm(THREAD);
1230   HandleMark hm(THREAD);
1231   Handle java_class(THREAD, JNIHandles::resolve(cls));
1232   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1233   return (jstring) JNIHandles::make_local(env, result);
1234 JVM_END
1235 
1236 
1237 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1238   JVMWrapper("JVM_GetClassInterfaces");
1239   JvmtiVMObjectAllocEventCollector oam;
1240   oop mirror = JNIHandles::resolve_non_null(cls);
1241 
1242   // Special handling for primitive objects
1243   if (java_lang_Class::is_primitive(mirror)) {
1244     // Primitive objects does not have any interfaces
1245     objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1246     return (jobjectArray) JNIHandles::make_local(env, r);
1247   }
1248 
1249   Klass* klass = java_lang_Class::as_Klass(mirror);
1250   // Figure size of result array
1251   int size;
1252   if (klass->is_instance_klass()) {
1253     size = InstanceKlass::cast(klass)->local_interfaces()->length();
1254   } else {
1255     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1256     size = 2;
1257   }
1258 
1259   // Allocate result array
1260   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1261   objArrayHandle result (THREAD, r);
1262   // Fill in result
1263   if (klass->is_instance_klass()) {
1264     // Regular instance klass, fill in all local interfaces
1265     for (int index = 0; index < size; index++) {
1266       Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1267       result->obj_at_put(index, k->java_mirror());
1268     }
1269   } else {
1270     // All arrays implement java.lang.Cloneable and java.io.Serializable
1271     result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1272     result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1273   }
1274   return (jobjectArray) JNIHandles::make_local(env, result());
1275 JVM_END
1276 
1277 
1278 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1279   JVMWrapper("JVM_IsInterface");
1280   oop mirror = JNIHandles::resolve_non_null(cls);
1281   if (java_lang_Class::is_primitive(mirror)) {
1282     return JNI_FALSE;
1283   }
1284   Klass* k = java_lang_Class::as_Klass(mirror);
1285   jboolean result = k->is_interface();
1286   assert(!result || k->is_instance_klass(),
1287          "all interfaces are instance types");
1288   // The compiler intrinsic for isInterface tests the
1289   // Klass::_access_flags bits in the same way.
1290   return result;
1291 JVM_END
1292 
1293 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1294   JVMWrapper("JVM_IsHiddenClass");
1295   oop mirror = JNIHandles::resolve_non_null(cls);
1296   if (java_lang_Class::is_primitive(mirror)) {
1297     return JNI_FALSE;
1298   }
1299   Klass* k = java_lang_Class::as_Klass(mirror);
1300   return k->is_hidden();
1301 JVM_END
1302 
1303 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1304   JVMWrapper("JVM_GetClassSigners");
1305   JvmtiVMObjectAllocEventCollector oam;
1306   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1307     // There are no signers for primitive types
1308     return NULL;
1309   }
1310 
1311   objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1312 
1313   // If there are no signers set in the class, or if the class
1314   // is an array, return NULL.
1315   if (signers == NULL) return NULL;
1316 
1317   // copy of the signers array
1318   Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1319   objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1320   for (int index = 0; index < signers->length(); index++) {
1321     signers_copy->obj_at_put(index, signers->obj_at(index));
1322   }
1323 
1324   // return the copy
1325   return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1326 JVM_END
1327 
1328 
1329 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1330   JVMWrapper("JVM_SetClassSigners");
1331   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1332     // This call is ignored for primitive types and arrays.
1333     // Signers are only set once, ClassLoader.java, and thus shouldn't
1334     // be called with an array.  Only the bootstrap loader creates arrays.
1335     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1336     if (k->is_instance_klass()) {
1337       java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1338     }
1339   }
1340 JVM_END
1341 
1342 
1343 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1344   JVMWrapper("JVM_GetProtectionDomain");
1345   if (JNIHandles::resolve(cls) == NULL) {
1346     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1347   }
1348 
1349   if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1350     // Primitive types does not have a protection domain.
1351     return NULL;
1352   }
1353 
1354   oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1355   return (jobject) JNIHandles::make_local(env, pd);
1356 JVM_END
1357 
1358 
1359 // Returns the inherited_access_control_context field of the running thread.
1360 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1361   JVMWrapper("JVM_GetInheritedAccessControlContext");
1362   oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1363   return JNIHandles::make_local(env, result);
1364 JVM_END
1365 
1366 class RegisterArrayForGC {
1367  private:
1368   JavaThread *_thread;
1369  public:
1370   RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array)  {
1371     _thread = thread;
1372     _thread->register_array_for_gc(array);
1373   }
1374 
1375   ~RegisterArrayForGC() {
1376     _thread->register_array_for_gc(NULL);
1377   }
1378 };
1379 
1380 
1381 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1382   JVMWrapper("JVM_GetStackAccessControlContext");
1383   if (!UsePrivilegedStack) return NULL;
1384 
1385   ResourceMark rm(THREAD);
1386   GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1387   JvmtiVMObjectAllocEventCollector oam;
1388 
1389   // count the protection domains on the execution stack. We collapse
1390   // duplicate consecutive protection domains into a single one, as
1391   // well as stopping when we hit a privileged frame.
1392 
1393   oop previous_protection_domain = NULL;
1394   Handle privileged_context(thread, NULL);
1395   bool is_privileged = false;
1396   oop protection_domain = NULL;
1397 
1398   // Iterate through Java frames
1399   vframeStream vfst(thread);
1400   for(; !vfst.at_end(); vfst.next()) {
1401     // get method of frame
1402     Method* method = vfst.method();
1403 
1404     // stop at the first privileged frame
1405     if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1406       method->name() == vmSymbols::executePrivileged_name())
1407     {
1408       // this frame is privileged
1409       is_privileged = true;
1410 
1411       javaVFrame *priv = vfst.asJavaVFrame();       // executePrivileged
1412 
1413       StackValueCollection* locals = priv->locals();
1414       StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1415       StackValue* clr_sv = locals->at(2); // Class<?> caller
1416       assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1417       assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1418       privileged_context    = ctx_sv->get_obj();
1419       Handle caller         = clr_sv->get_obj();
1420 
1421       Klass *caller_klass = java_lang_Class::as_Klass(caller());
1422       protection_domain  = caller_klass->protection_domain();
1423     } else {
1424       protection_domain = method->method_holder()->protection_domain();
1425     }
1426 
1427     if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1428       local_array->push(protection_domain);
1429       previous_protection_domain = protection_domain;
1430     }
1431 
1432     if (is_privileged) break;
1433   }
1434 
1435 
1436   // either all the domains on the stack were system domains, or
1437   // we had a privileged system domain
1438   if (local_array->is_empty()) {
1439     if (is_privileged && privileged_context.is_null()) return NULL;
1440 
1441     oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1442     return JNIHandles::make_local(env, result);
1443   }
1444 
1445   // the resource area must be registered in case of a gc
1446   RegisterArrayForGC ragc(thread, local_array);
1447   objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1448                                                  local_array->length(), CHECK_NULL);
1449   objArrayHandle h_context(thread, context);
1450   for (int index = 0; index < local_array->length(); index++) {
1451     h_context->obj_at_put(index, local_array->at(index));
1452   }
1453 
1454   oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1455 
1456   return JNIHandles::make_local(env, result);
1457 JVM_END
1458 
1459 
1460 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1461   JVMWrapper("JVM_IsArrayClass");
1462   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1463   return (k != NULL) && k->is_array_klass() ? true : false;
1464 JVM_END
1465 
1466 
1467 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1468   JVMWrapper("JVM_IsPrimitiveClass");
1469   oop mirror = JNIHandles::resolve_non_null(cls);
1470   return (jboolean) java_lang_Class::is_primitive(mirror);
1471 JVM_END
1472 
1473 
1474 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1475   JVMWrapper("JVM_GetClassModifiers");
1476   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1477     // Primitive type
1478     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1479   }
1480 
1481   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1482   debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1483   assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1484   return k->modifier_flags();
1485 JVM_END
1486 
1487 
1488 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1489 
1490 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1491   JvmtiVMObjectAllocEventCollector oam;
1492   // ofClass is a reference to a java_lang_Class object. The mirror object
1493   // of an InstanceKlass
1494 
1495   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1496       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1497     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1498     return (jobjectArray)JNIHandles::make_local(env, result);
1499   }
1500 
1501   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1502   InnerClassesIterator iter(k);
1503 
1504   if (iter.length() == 0) {
1505     // Neither an inner nor outer class
1506     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1507     return (jobjectArray)JNIHandles::make_local(env, result);
1508   }
1509 
1510   // find inner class info
1511   constantPoolHandle cp(thread, k->constants());
1512   int length = iter.length();
1513 
1514   // Allocate temp. result array
1515   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1516   objArrayHandle result (THREAD, r);
1517   int members = 0;
1518 
1519   for (; !iter.done(); iter.next()) {
1520     int ioff = iter.inner_class_info_index();
1521     int ooff = iter.outer_class_info_index();
1522 
1523     if (ioff != 0 && ooff != 0) {
1524       // Check to see if the name matches the class we're looking for
1525       // before attempting to find the class.
1526       if (cp->klass_name_at_matches(k, ooff)) {
1527         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1528         if (outer_klass == k) {
1529            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1530            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1531 
1532            // Throws an exception if outer klass has not declared k as
1533            // an inner klass
1534            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1535 
1536            result->obj_at_put(members, inner_klass->java_mirror());
1537            members++;
1538         }
1539       }
1540     }
1541   }
1542 
1543   if (members != length) {
1544     // Return array of right length
1545     objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1546     for(int i = 0; i < members; i++) {
1547       res->obj_at_put(i, result->obj_at(i));
1548     }
1549     return (jobjectArray)JNIHandles::make_local(env, res);
1550   }
1551 
1552   return (jobjectArray)JNIHandles::make_local(env, result());
1553 JVM_END
1554 
1555 
1556 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1557 {
1558   // ofClass is a reference to a java_lang_Class object.
1559   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1560       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1561     return NULL;
1562   }
1563 
1564   bool inner_is_member = false;
1565   Klass* outer_klass
1566     = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1567                           )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1568   if (outer_klass == NULL)  return NULL;  // already a top-level class
1569   if (!inner_is_member)  return NULL;     // a hidden or unsafe anonymous class (inside a method)
1570   return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1571 }
1572 JVM_END
1573 
1574 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1575 {
1576   oop mirror = JNIHandles::resolve_non_null(cls);
1577   if (java_lang_Class::is_primitive(mirror) ||
1578       !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1579     return NULL;
1580   }
1581   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1582   int ooff = 0, noff = 0;
1583   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1584     if (noff != 0) {
1585       constantPoolHandle i_cp(thread, k->constants());
1586       Symbol* name = i_cp->symbol_at(noff);
1587       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1588       return (jstring) JNIHandles::make_local(env, str());
1589     }
1590   }
1591   return NULL;
1592 }
1593 JVM_END
1594 
1595 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1596   assert (cls != NULL, "illegal class");
1597   JVMWrapper("JVM_GetClassSignature");
1598   JvmtiVMObjectAllocEventCollector oam;
1599   ResourceMark rm(THREAD);
1600   // Return null for arrays and primatives
1601   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1602     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1603     if (k->is_instance_klass()) {
1604       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1605       if (sym == NULL) return NULL;
1606       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1607       return (jstring) JNIHandles::make_local(env, str());
1608     }
1609   }
1610   return NULL;
1611 JVM_END
1612 
1613 
1614 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1615   assert (cls != NULL, "illegal class");
1616   JVMWrapper("JVM_GetClassAnnotations");
1617 
1618   // Return null for arrays and primitives
1619   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1620     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1621     if (k->is_instance_klass()) {
1622       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1623       return (jbyteArray) JNIHandles::make_local(env, a);
1624     }
1625   }
1626   return NULL;
1627 JVM_END
1628 
1629 
1630 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1631   // some of this code was adapted from from jni_FromReflectedField
1632 
1633   oop reflected = JNIHandles::resolve_non_null(field);
1634   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1635   Klass* k    = java_lang_Class::as_Klass(mirror);
1636   int slot      = java_lang_reflect_Field::slot(reflected);
1637   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1638 
1639   InstanceKlass* ik = InstanceKlass::cast(k);
1640   intptr_t offset = ik->field_offset(slot);
1641 
1642   if (modifiers & JVM_ACC_STATIC) {
1643     // for static fields we only look in the current class
1644     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1645       assert(false, "cannot find static field");
1646       return false;
1647     }
1648   } else {
1649     // for instance fields we start with the current class and work
1650     // our way up through the superclass chain
1651     if (!ik->find_field_from_offset(offset, false, &fd)) {
1652       assert(false, "cannot find instance field");
1653       return false;
1654     }
1655   }
1656   return true;
1657 }
1658 
1659 static Method* jvm_get_method_common(jobject method) {
1660   // some of this code was adapted from from jni_FromReflectedMethod
1661 
1662   oop reflected = JNIHandles::resolve_non_null(method);
1663   oop mirror    = NULL;
1664   int slot      = 0;
1665 
1666   if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1667     mirror = java_lang_reflect_Constructor::clazz(reflected);
1668     slot   = java_lang_reflect_Constructor::slot(reflected);
1669   } else {
1670     assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1671            "wrong type");
1672     mirror = java_lang_reflect_Method::clazz(reflected);
1673     slot   = java_lang_reflect_Method::slot(reflected);
1674   }
1675   Klass* k = java_lang_Class::as_Klass(mirror);
1676 
1677   Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1678   assert(m != NULL, "cannot find method");
1679   return m;  // caller has to deal with NULL in product mode
1680 }
1681 
1682 /* Type use annotations support (JDK 1.8) */
1683 
1684 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1685   assert (cls != NULL, "illegal class");
1686   JVMWrapper("JVM_GetClassTypeAnnotations");
1687   ResourceMark rm(THREAD);
1688   // Return null for arrays and primitives
1689   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1690     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1691     if (k->is_instance_klass()) {
1692       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1693       if (type_annotations != NULL) {
1694         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1695         return (jbyteArray) JNIHandles::make_local(env, a);
1696       }
1697     }
1698   }
1699   return NULL;
1700 JVM_END
1701 
1702 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1703   assert (method != NULL, "illegal method");
1704   JVMWrapper("JVM_GetMethodTypeAnnotations");
1705 
1706   // method is a handle to a java.lang.reflect.Method object
1707   Method* m = jvm_get_method_common(method);
1708   if (m == NULL) {
1709     return NULL;
1710   }
1711 
1712   AnnotationArray* type_annotations = m->type_annotations();
1713   if (type_annotations != NULL) {
1714     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1715     return (jbyteArray) JNIHandles::make_local(env, a);
1716   }
1717 
1718   return NULL;
1719 JVM_END
1720 
1721 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1722   assert (field != NULL, "illegal field");
1723   JVMWrapper("JVM_GetFieldTypeAnnotations");
1724 
1725   fieldDescriptor fd;
1726   bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1727   if (!gotFd) {
1728     return NULL;
1729   }
1730 
1731   return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1732 JVM_END
1733 
1734 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1735   if (!cp->is_within_bounds(index)) {
1736     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1737   }
1738 }
1739 
1740 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1741 {
1742   JVMWrapper("JVM_GetMethodParameters");
1743   // method is a handle to a java.lang.reflect.Method object
1744   Method* method_ptr = jvm_get_method_common(method);
1745   methodHandle mh (THREAD, method_ptr);
1746   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1747   const int num_params = mh->method_parameters_length();
1748 
1749   if (num_params < 0) {
1750     // A -1 return value from method_parameters_length means there is no
1751     // parameter data.  Return null to indicate this to the reflection
1752     // API.
1753     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1754     return (jobjectArray)NULL;
1755   } else {
1756     // Otherwise, we return something up to reflection, even if it is
1757     // a zero-length array.  Why?  Because in some cases this can
1758     // trigger a MalformedParametersException.
1759 
1760     // make sure all the symbols are properly formatted
1761     for (int i = 0; i < num_params; i++) {
1762       MethodParametersElement* params = mh->method_parameters_start();
1763       int index = params[i].name_cp_index;
1764       constantPoolHandle cp(THREAD, mh->constants());
1765       bounds_check(cp, index, CHECK_NULL);
1766 
1767       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1768         THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1769                     "Wrong type at constant pool index");
1770       }
1771 
1772     }
1773 
1774     objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1775     objArrayHandle result (THREAD, result_oop);
1776 
1777     for (int i = 0; i < num_params; i++) {
1778       MethodParametersElement* params = mh->method_parameters_start();
1779       // For a 0 index, give a NULL symbol
1780       Symbol* sym = 0 != params[i].name_cp_index ?
1781         mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1782       int flags = params[i].flags;
1783       oop param = Reflection::new_parameter(reflected_method, i, sym,
1784                                             flags, CHECK_NULL);
1785       result->obj_at_put(i, param);
1786     }
1787     return (jobjectArray)JNIHandles::make_local(env, result());
1788   }
1789 }
1790 JVM_END
1791 
1792 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1793 
1794 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1795 {
1796   JVMWrapper("JVM_GetClassDeclaredFields");
1797   JvmtiVMObjectAllocEventCollector oam;
1798 
1799   // Exclude primitive types and array types
1800   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1801       java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1802     // Return empty array
1803     oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1804     return (jobjectArray) JNIHandles::make_local(env, res);
1805   }
1806 
1807   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1808   constantPoolHandle cp(THREAD, k->constants());
1809 
1810   // Ensure class is linked
1811   k->link_class(CHECK_NULL);
1812 
1813   // Allocate result
1814   int num_fields;
1815 
1816   if (publicOnly) {
1817     num_fields = 0;
1818     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1819       if (fs.access_flags().is_public()) ++num_fields;
1820     }
1821   } else {
1822     num_fields = k->java_fields_count();
1823   }
1824 
1825   objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1826   objArrayHandle result (THREAD, r);
1827 
1828   int out_idx = 0;
1829   fieldDescriptor fd;
1830   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1831     if (!publicOnly || fs.access_flags().is_public()) {
1832       fd.reinitialize(k, fs.index());
1833       oop field = Reflection::new_field(&fd, CHECK_NULL);
1834       result->obj_at_put(out_idx, field);
1835       ++out_idx;
1836     }
1837   }
1838   assert(out_idx == num_fields, "just checking");
1839   return (jobjectArray) JNIHandles::make_local(env, result());
1840 }
1841 JVM_END
1842 
1843 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1844 {
1845   JVMWrapper("JVM_IsRecord");
1846   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1847   if (k != NULL && k->is_instance_klass()) {
1848     InstanceKlass* ik = InstanceKlass::cast(k);
1849     return ik->is_record();
1850   } else {
1851     return false;
1852   }
1853 }
1854 JVM_END
1855 
1856 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1857 {
1858   JVMWrapper("JVM_GetRecordComponents");
1859   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1860   assert(c->is_instance_klass(), "must be");
1861   InstanceKlass* ik = InstanceKlass::cast(c);
1862 
1863   if (ik->is_record()) {
1864     Array<RecordComponent*>* components = ik->record_components();
1865     assert(components != NULL, "components should not be NULL");
1866     {
1867       JvmtiVMObjectAllocEventCollector oam;
1868       constantPoolHandle cp(THREAD, ik->constants());
1869       int length = components->length();
1870       assert(length >= 0, "unexpected record_components length");
1871       objArrayOop record_components =
1872         oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1873       objArrayHandle components_h (THREAD, record_components);
1874 
1875       for (int x = 0; x < length; x++) {
1876         RecordComponent* component = components->at(x);
1877         assert(component != NULL, "unexpected NULL record component");
1878         oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1879         components_h->obj_at_put(x, component_oop);
1880       }
1881       return (jobjectArray)JNIHandles::make_local(components_h());
1882     }
1883   }
1884 
1885   // Return empty array if ofClass is not a record.
1886   objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1887   return (jobjectArray)JNIHandles::make_local(env, result);
1888 }
1889 JVM_END
1890 
1891 static bool select_method(const methodHandle& method, bool want_constructor) {
1892   if (want_constructor) {
1893     return (method->is_initializer() && !method->is_static());
1894   } else {
1895     return  (!method->is_initializer() && !method->is_overpass());
1896   }
1897 }
1898 
1899 static jobjectArray get_class_declared_methods_helper(
1900                                   JNIEnv *env,
1901                                   jclass ofClass, jboolean publicOnly,
1902                                   bool want_constructor,
1903                                   Klass* klass, TRAPS) {
1904 
1905   JvmtiVMObjectAllocEventCollector oam;
1906 
1907   // Exclude primitive types and array types
1908   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1909       || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1910     // Return empty array
1911     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1912     return (jobjectArray) JNIHandles::make_local(env, res);
1913   }
1914 
1915   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1916 
1917   // Ensure class is linked
1918   k->link_class(CHECK_NULL);
1919 
1920   Array<Method*>* methods = k->methods();
1921   int methods_length = methods->length();
1922 
1923   // Save original method_idnum in case of redefinition, which can change
1924   // the idnum of obsolete methods.  The new method will have the same idnum
1925   // but if we refresh the methods array, the counts will be wrong.
1926   ResourceMark rm(THREAD);
1927   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1928   int num_methods = 0;
1929 
1930   for (int i = 0; i < methods_length; i++) {
1931     methodHandle method(THREAD, methods->at(i));
1932     if (select_method(method, want_constructor)) {
1933       if (!publicOnly || method->is_public()) {
1934         idnums->push(method->method_idnum());
1935         ++num_methods;
1936       }
1937     }
1938   }
1939 
1940   // Allocate result
1941   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1942   objArrayHandle result (THREAD, r);
1943 
1944   // Now just put the methods that we selected above, but go by their idnum
1945   // in case of redefinition.  The methods can be redefined at any safepoint,
1946   // so above when allocating the oop array and below when creating reflect
1947   // objects.
1948   for (int i = 0; i < num_methods; i++) {
1949     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1950     if (method.is_null()) {
1951       // Method may have been deleted and seems this API can handle null
1952       // Otherwise should probably put a method that throws NSME
1953       result->obj_at_put(i, NULL);
1954     } else {
1955       oop m;
1956       if (want_constructor) {
1957         m = Reflection::new_constructor(method, CHECK_NULL);
1958       } else {
1959         m = Reflection::new_method(method, false, CHECK_NULL);
1960       }
1961       result->obj_at_put(i, m);
1962     }
1963   }
1964 
1965   return (jobjectArray) JNIHandles::make_local(env, result());
1966 }
1967 
1968 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1969 {
1970   JVMWrapper("JVM_GetClassDeclaredMethods");
1971   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1972                                            /*want_constructor*/ false,
1973                                            SystemDictionary::reflect_Method_klass(), THREAD);
1974 }
1975 JVM_END
1976 
1977 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1978 {
1979   JVMWrapper("JVM_GetClassDeclaredConstructors");
1980   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1981                                            /*want_constructor*/ true,
1982                                            SystemDictionary::reflect_Constructor_klass(), THREAD);
1983 }
1984 JVM_END
1985 
1986 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1987 {
1988   JVMWrapper("JVM_GetClassAccessFlags");
1989   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1990     // Primitive type
1991     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1992   }
1993 
1994   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1995   return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1996 }
1997 JVM_END
1998 
1999 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2000 {
2001   JVMWrapper("JVM_AreNestMates");
2002   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2003   assert(c->is_instance_klass(), "must be");
2004   InstanceKlass* ck = InstanceKlass::cast(c);
2005   Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2006   assert(m->is_instance_klass(), "must be");
2007   InstanceKlass* mk = InstanceKlass::cast(m);
2008   return ck->has_nestmate_access_to(mk, THREAD);
2009 }
2010 JVM_END
2011 
2012 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2013 {
2014   // current is not a primitive or array class
2015   JVMWrapper("JVM_GetNestHost");
2016   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2017   assert(c->is_instance_klass(), "must be");
2018   InstanceKlass* ck = InstanceKlass::cast(c);
2019   InstanceKlass* host = ck->nest_host(THREAD);
2020   return (jclass) (host == NULL ? NULL :
2021                    JNIHandles::make_local(THREAD, host->java_mirror()));
2022 }
2023 JVM_END
2024 
2025 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2026 {
2027   // current is not a primitive or array class
2028   JVMWrapper("JVM_GetNestMembers");
2029   ResourceMark rm(THREAD);
2030   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2031   assert(c->is_instance_klass(), "must be");
2032   InstanceKlass* ck = InstanceKlass::cast(c);
2033   InstanceKlass* host = ck->nest_host(THREAD);
2034 
2035   log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2036                               ck->external_name(), host->external_name());
2037   {
2038     JvmtiVMObjectAllocEventCollector oam;
2039     Array<u2>* members = host->nest_members();
2040     int length = members == NULL ? 0 : members->length();
2041 
2042     log_trace(class, nestmates)(" - host has %d listed nest members", length);
2043 
2044     // nest host is first in the array so make it one bigger
2045     objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2046                                              length + 1, CHECK_NULL);
2047     objArrayHandle result(THREAD, r);
2048     result->obj_at_put(0, host->java_mirror());
2049     if (length != 0) {
2050       int count = 0;
2051       for (int i = 0; i < length; i++) {
2052         int cp_index = members->at(i);
2053         Klass* k = host->constants()->klass_at(cp_index, THREAD);
2054         if (HAS_PENDING_EXCEPTION) {
2055           if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
2056             return NULL; // propagate VMEs
2057           }
2058           if (log_is_enabled(Trace, class, nestmates)) {
2059             stringStream ss;
2060             char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2061             ss.print(" - resolution of nest member %s failed: ", target_member_class);
2062             java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2063             log_trace(class, nestmates)("%s", ss.as_string());
2064           }
2065           CLEAR_PENDING_EXCEPTION;
2066           continue;
2067         }
2068         if (k->is_instance_klass()) {
2069           InstanceKlass* ik = InstanceKlass::cast(k);
2070           InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2071           if (nest_host_k == host) {
2072             result->obj_at_put(count+1, k->java_mirror());
2073             count++;
2074             log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2075           } else {
2076             log_trace(class, nestmates)(" - skipping member %s with different host %s",
2077                                         ik->external_name(), nest_host_k->external_name());
2078           }
2079         } else {
2080           log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2081                                       k->external_name());
2082         }
2083       }
2084       if (count < length) {
2085         // we had invalid entries so we need to compact the array
2086         log_trace(class, nestmates)(" - compacting array from length %d to %d",
2087                                     length + 1, count + 1);
2088 
2089         objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2090                                                   count + 1, CHECK_NULL);
2091         objArrayHandle result2(THREAD, r2);
2092         for (int i = 0; i < count + 1; i++) {
2093           result2->obj_at_put(i, result->obj_at(i));
2094         }
2095         return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2096       }
2097     }
2098     else {
2099       assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2100     }
2101     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2102   }
2103 }
2104 JVM_END
2105 
2106 // Constant pool access //////////////////////////////////////////////////////////
2107 
2108 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2109 {
2110   JVMWrapper("JVM_GetClassConstantPool");
2111   JvmtiVMObjectAllocEventCollector oam;
2112 
2113   // Return null for primitives and arrays
2114   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2115     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2116     if (k->is_instance_klass()) {
2117       InstanceKlass* k_h = InstanceKlass::cast(k);
2118       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2119       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2120       return JNIHandles::make_local(jcp());
2121     }
2122   }
2123   return NULL;
2124 }
2125 JVM_END
2126 
2127 
2128 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2129 {
2130   JVMWrapper("JVM_ConstantPoolGetSize");
2131   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2132   return cp->length();
2133 }
2134 JVM_END
2135 
2136 
2137 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2138 {
2139   JVMWrapper("JVM_ConstantPoolGetClassAt");
2140   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141   bounds_check(cp, index, CHECK_NULL);
2142   constantTag tag = cp->tag_at(index);
2143   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2144     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145   }
2146   Klass* k = cp->klass_at(index, CHECK_NULL);
2147   return (jclass) JNIHandles::make_local(k->java_mirror());
2148 }
2149 JVM_END
2150 
2151 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2152 {
2153   JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2154   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2155   bounds_check(cp, index, CHECK_NULL);
2156   constantTag tag = cp->tag_at(index);
2157   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2158     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2159   }
2160   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2161   if (k == NULL) return NULL;
2162   return (jclass) JNIHandles::make_local(k->java_mirror());
2163 }
2164 JVM_END
2165 
2166 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2167   constantTag tag = cp->tag_at(index);
2168   if (!tag.is_method() && !tag.is_interface_method()) {
2169     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2170   }
2171   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2172   Klass* k_o;
2173   if (force_resolution) {
2174     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2175   } else {
2176     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2177     if (k_o == NULL) return NULL;
2178   }
2179   InstanceKlass* k = InstanceKlass::cast(k_o);
2180   Symbol* name = cp->uncached_name_ref_at(index);
2181   Symbol* sig  = cp->uncached_signature_ref_at(index);
2182   methodHandle m (THREAD, k->find_method(name, sig));
2183   if (m.is_null()) {
2184     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2185   }
2186   oop method;
2187   if (!m->is_initializer() || m->is_static()) {
2188     method = Reflection::new_method(m, true, CHECK_NULL);
2189   } else {
2190     method = Reflection::new_constructor(m, CHECK_NULL);
2191   }
2192   return JNIHandles::make_local(method);
2193 }
2194 
2195 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2196 {
2197   JVMWrapper("JVM_ConstantPoolGetMethodAt");
2198   JvmtiVMObjectAllocEventCollector oam;
2199   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2200   bounds_check(cp, index, CHECK_NULL);
2201   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2202   return res;
2203 }
2204 JVM_END
2205 
2206 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2207 {
2208   JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2209   JvmtiVMObjectAllocEventCollector oam;
2210   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2211   bounds_check(cp, index, CHECK_NULL);
2212   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2213   return res;
2214 }
2215 JVM_END
2216 
2217 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2218   constantTag tag = cp->tag_at(index);
2219   if (!tag.is_field()) {
2220     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2221   }
2222   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2223   Klass* k_o;
2224   if (force_resolution) {
2225     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2226   } else {
2227     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2228     if (k_o == NULL) return NULL;
2229   }
2230   InstanceKlass* k = InstanceKlass::cast(k_o);
2231   Symbol* name = cp->uncached_name_ref_at(index);
2232   Symbol* sig  = cp->uncached_signature_ref_at(index);
2233   fieldDescriptor fd;
2234   Klass* target_klass = k->find_field(name, sig, &fd);
2235   if (target_klass == NULL) {
2236     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2237   }
2238   oop field = Reflection::new_field(&fd, CHECK_NULL);
2239   return JNIHandles::make_local(field);
2240 }
2241 
2242 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2243 {
2244   JVMWrapper("JVM_ConstantPoolGetFieldAt");
2245   JvmtiVMObjectAllocEventCollector oam;
2246   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2247   bounds_check(cp, index, CHECK_NULL);
2248   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2249   return res;
2250 }
2251 JVM_END
2252 
2253 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2254 {
2255   JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2256   JvmtiVMObjectAllocEventCollector oam;
2257   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2258   bounds_check(cp, index, CHECK_NULL);
2259   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2260   return res;
2261 }
2262 JVM_END
2263 
2264 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2265 {
2266   JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2267   JvmtiVMObjectAllocEventCollector oam;
2268   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2269   bounds_check(cp, index, CHECK_NULL);
2270   constantTag tag = cp->tag_at(index);
2271   if (!tag.is_field_or_method()) {
2272     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2273   }
2274   int klass_ref = cp->uncached_klass_ref_index_at(index);
2275   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2276   Symbol*  member_name = cp->uncached_name_ref_at(index);
2277   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2278   objArrayOop  dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2279   objArrayHandle dest(THREAD, dest_o);
2280   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2281   dest->obj_at_put(0, str());
2282   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2283   dest->obj_at_put(1, str());
2284   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2285   dest->obj_at_put(2, str());
2286   return (jobjectArray) JNIHandles::make_local(dest());
2287 }
2288 JVM_END
2289 
2290 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2291 {
2292   JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2293   JvmtiVMObjectAllocEventCollector oam;
2294   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2295   bounds_check(cp, index, CHECK_0);
2296   constantTag tag = cp->tag_at(index);
2297   if (!tag.is_field_or_method()) {
2298     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2299   }
2300   return (jint) cp->uncached_klass_ref_index_at(index);
2301 }
2302 JVM_END
2303 
2304 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2305 {
2306   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2307   JvmtiVMObjectAllocEventCollector oam;
2308   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2309   bounds_check(cp, index, CHECK_0);
2310   constantTag tag = cp->tag_at(index);
2311   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2312     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2313   }
2314   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2315 }
2316 JVM_END
2317 
2318 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2319 {
2320   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2321   JvmtiVMObjectAllocEventCollector oam;
2322   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2323   bounds_check(cp, index, CHECK_NULL);
2324   constantTag tag = cp->tag_at(index);
2325   if (!tag.is_name_and_type()) {
2326     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2327   }
2328   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2329   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2330   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2331   objArrayHandle dest(THREAD, dest_o);
2332   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2333   dest->obj_at_put(0, str());
2334   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2335   dest->obj_at_put(1, str());
2336   return (jobjectArray) JNIHandles::make_local(dest());
2337 }
2338 JVM_END
2339 
2340 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2341 {
2342   JVMWrapper("JVM_ConstantPoolGetIntAt");
2343   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2344   bounds_check(cp, index, CHECK_0);
2345   constantTag tag = cp->tag_at(index);
2346   if (!tag.is_int()) {
2347     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2348   }
2349   return cp->int_at(index);
2350 }
2351 JVM_END
2352 
2353 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2354 {
2355   JVMWrapper("JVM_ConstantPoolGetLongAt");
2356   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2357   bounds_check(cp, index, CHECK_(0L));
2358   constantTag tag = cp->tag_at(index);
2359   if (!tag.is_long()) {
2360     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2361   }
2362   return cp->long_at(index);
2363 }
2364 JVM_END
2365 
2366 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2367 {
2368   JVMWrapper("JVM_ConstantPoolGetFloatAt");
2369   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2370   bounds_check(cp, index, CHECK_(0.0f));
2371   constantTag tag = cp->tag_at(index);
2372   if (!tag.is_float()) {
2373     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2374   }
2375   return cp->float_at(index);
2376 }
2377 JVM_END
2378 
2379 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2380 {
2381   JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2382   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2383   bounds_check(cp, index, CHECK_(0.0));
2384   constantTag tag = cp->tag_at(index);
2385   if (!tag.is_double()) {
2386     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2387   }
2388   return cp->double_at(index);
2389 }
2390 JVM_END
2391 
2392 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2393 {
2394   JVMWrapper("JVM_ConstantPoolGetStringAt");
2395   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2396   bounds_check(cp, index, CHECK_NULL);
2397   constantTag tag = cp->tag_at(index);
2398   if (!tag.is_string()) {
2399     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2400   }
2401   oop str = cp->string_at(index, CHECK_NULL);
2402   return (jstring) JNIHandles::make_local(str);
2403 }
2404 JVM_END
2405 
2406 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2407 {
2408   JVMWrapper("JVM_ConstantPoolGetUTF8At");
2409   JvmtiVMObjectAllocEventCollector oam;
2410   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2411   bounds_check(cp, index, CHECK_NULL);
2412   constantTag tag = cp->tag_at(index);
2413   if (!tag.is_symbol()) {
2414     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2415   }
2416   Symbol* sym = cp->symbol_at(index);
2417   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2418   return (jstring) JNIHandles::make_local(str());
2419 }
2420 JVM_END
2421 
2422 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2423 {
2424   JVMWrapper("JVM_ConstantPoolGetTagAt");
2425   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2426   bounds_check(cp, index, CHECK_0);
2427   constantTag tag = cp->tag_at(index);
2428   jbyte result = tag.value();
2429   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2430   // they are changed to the corresponding tags from the JVM spec, so that java code in
2431   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2432   if (tag.is_klass_or_reference()) {
2433       result = JVM_CONSTANT_Class;
2434   } else if (tag.is_string_index()) {
2435       result = JVM_CONSTANT_String;
2436   } else if (tag.is_method_type_in_error()) {
2437       result = JVM_CONSTANT_MethodType;
2438   } else if (tag.is_method_handle_in_error()) {
2439       result = JVM_CONSTANT_MethodHandle;
2440   } else if (tag.is_dynamic_constant_in_error()) {
2441       result = JVM_CONSTANT_Dynamic;
2442   }
2443   return result;
2444 }
2445 JVM_END
2446 
2447 // Assertion support. //////////////////////////////////////////////////////////
2448 
2449 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2450   JVMWrapper("JVM_DesiredAssertionStatus");
2451   assert(cls != NULL, "bad class");
2452 
2453   oop r = JNIHandles::resolve(cls);
2454   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2455   if (java_lang_Class::is_primitive(r)) return false;
2456 
2457   Klass* k = java_lang_Class::as_Klass(r);
2458   assert(k->is_instance_klass(), "must be an instance klass");
2459   if (!k->is_instance_klass()) return false;
2460 
2461   ResourceMark rm(THREAD);
2462   const char* name = k->name()->as_C_string();
2463   bool system_class = k->class_loader() == NULL;
2464   return JavaAssertions::enabled(name, system_class);
2465 
2466 JVM_END
2467 
2468 
2469 // Return a new AssertionStatusDirectives object with the fields filled in with
2470 // command-line assertion arguments (i.e., -ea, -da).
2471 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2472   JVMWrapper("JVM_AssertionStatusDirectives");
2473   JvmtiVMObjectAllocEventCollector oam;
2474   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2475   return JNIHandles::make_local(env, asd);
2476 JVM_END
2477 
2478 // Verification ////////////////////////////////////////////////////////////////////////////////
2479 
2480 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2481 
2482 // RedefineClasses support: bug 6214132 caused verification to fail.
2483 // All functions from this section should call the jvmtiThreadSate function:
2484 //   Klass* class_to_verify_considering_redefinition(Klass* klass).
2485 // The function returns a Klass* of the _scratch_class if the verifier
2486 // was invoked in the middle of the class redefinition.
2487 // Otherwise it returns its argument value which is the _the_class Klass*.
2488 // Please, refer to the description in the jvmtiThreadSate.hpp.
2489 
2490 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2491   JVMWrapper("JVM_GetClassNameUTF");
2492   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2493   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2494   return k->name()->as_utf8();
2495 JVM_END
2496 
2497 
2498 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2499   JVMWrapper("JVM_GetClassCPTypes");
2500   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2501   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2502   // types will have length zero if this is not an InstanceKlass
2503   // (length is determined by call to JVM_GetClassCPEntriesCount)
2504   if (k->is_instance_klass()) {
2505     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2506     for (int index = cp->length() - 1; index >= 0; index--) {
2507       constantTag tag = cp->tag_at(index);
2508       types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2509     }
2510   }
2511 JVM_END
2512 
2513 
2514 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2515   JVMWrapper("JVM_GetClassCPEntriesCount");
2516   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2517   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2518   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2519 JVM_END
2520 
2521 
2522 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2523   JVMWrapper("JVM_GetClassFieldsCount");
2524   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2525   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2526   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2527 JVM_END
2528 
2529 
2530 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2531   JVMWrapper("JVM_GetClassMethodsCount");
2532   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2533   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2534   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2535 JVM_END
2536 
2537 
2538 // The following methods, used for the verifier, are never called with
2539 // array klasses, so a direct cast to InstanceKlass is safe.
2540 // Typically, these methods are called in a loop with bounds determined
2541 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2542 // zero for arrays.
2543 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2544   JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2545   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2546   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2547   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2548   int length = method->checked_exceptions_length();
2549   if (length > 0) {
2550     CheckedExceptionElement* table= method->checked_exceptions_start();
2551     for (int i = 0; i < length; i++) {
2552       exceptions[i] = table[i].class_cp_index;
2553     }
2554   }
2555 JVM_END
2556 
2557 
2558 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2559   JVMWrapper("JVM_GetMethodIxExceptionsCount");
2560   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2563   return method->checked_exceptions_length();
2564 JVM_END
2565 
2566 
2567 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2568   JVMWrapper("JVM_GetMethodIxByteCode");
2569   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2570   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2571   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2572   memcpy(code, method->code_base(), method->code_size());
2573 JVM_END
2574 
2575 
2576 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2577   JVMWrapper("JVM_GetMethodIxByteCodeLength");
2578   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2579   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2580   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2581   return method->code_size();
2582 JVM_END
2583 
2584 
2585 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2586   JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2587   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2588   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2589   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2590   ExceptionTable extable(method);
2591   entry->start_pc   = extable.start_pc(entry_index);
2592   entry->end_pc     = extable.end_pc(entry_index);
2593   entry->handler_pc = extable.handler_pc(entry_index);
2594   entry->catchType  = extable.catch_type_index(entry_index);
2595 JVM_END
2596 
2597 
2598 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2599   JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2600   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2601   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2602   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2603   return method->exception_table_length();
2604 JVM_END
2605 
2606 
2607 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2608   JVMWrapper("JVM_GetMethodIxModifiers");
2609   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2610   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2611   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2612   return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2613 JVM_END
2614 
2615 
2616 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2617   JVMWrapper("JVM_GetFieldIxModifiers");
2618   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2619   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2620   return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2621 JVM_END
2622 
2623 
2624 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2625   JVMWrapper("JVM_GetMethodIxLocalsCount");
2626   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2627   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2628   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2629   return method->max_locals();
2630 JVM_END
2631 
2632 
2633 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2634   JVMWrapper("JVM_GetMethodIxArgsSize");
2635   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2637   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2638   return method->size_of_parameters();
2639 JVM_END
2640 
2641 
2642 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2643   JVMWrapper("JVM_GetMethodIxMaxStack");
2644   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2645   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2646   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2647   return method->verifier_max_stack();
2648 JVM_END
2649 
2650 
2651 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2652   JVMWrapper("JVM_IsConstructorIx");
2653   ResourceMark rm(THREAD);
2654   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2655   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2656   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2657   return method->name() == vmSymbols::object_initializer_name();
2658 JVM_END
2659 
2660 
2661 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2662   JVMWrapper("JVM_IsVMGeneratedMethodIx");
2663   ResourceMark rm(THREAD);
2664   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2665   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2666   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2667   return method->is_overpass();
2668 JVM_END
2669 
2670 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2671   JVMWrapper("JVM_GetMethodIxIxUTF");
2672   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2673   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2674   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2675   return method->name()->as_utf8();
2676 JVM_END
2677 
2678 
2679 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2680   JVMWrapper("JVM_GetMethodIxSignatureUTF");
2681   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2682   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2683   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2684   return method->signature()->as_utf8();
2685 JVM_END
2686 
2687 /**
2688  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2689  * read entries in the constant pool.  Since the old verifier always
2690  * works on a copy of the code, it will not see any rewriting that
2691  * may possibly occur in the middle of verification.  So it is important
2692  * that nothing it calls tries to use the cpCache instead of the raw
2693  * constant pool, so we must use cp->uncached_x methods when appropriate.
2694  */
2695 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2696   JVMWrapper("JVM_GetCPFieldNameUTF");
2697   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2698   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2699   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2700   switch (cp->tag_at(cp_index).value()) {
2701     case JVM_CONSTANT_Fieldref:
2702       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2703     default:
2704       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2705   }
2706   ShouldNotReachHere();
2707   return NULL;
2708 JVM_END
2709 
2710 
2711 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2712   JVMWrapper("JVM_GetCPMethodNameUTF");
2713   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2714   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2715   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2716   switch (cp->tag_at(cp_index).value()) {
2717     case JVM_CONSTANT_InterfaceMethodref:
2718     case JVM_CONSTANT_Methodref:
2719       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2720     default:
2721       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2722   }
2723   ShouldNotReachHere();
2724   return NULL;
2725 JVM_END
2726 
2727 
2728 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2729   JVMWrapper("JVM_GetCPMethodSignatureUTF");
2730   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2731   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2732   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2733   switch (cp->tag_at(cp_index).value()) {
2734     case JVM_CONSTANT_InterfaceMethodref:
2735     case JVM_CONSTANT_Methodref:
2736       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2737     default:
2738       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2739   }
2740   ShouldNotReachHere();
2741   return NULL;
2742 JVM_END
2743 
2744 
2745 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2746   JVMWrapper("JVM_GetCPFieldSignatureUTF");
2747   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2748   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2749   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2750   switch (cp->tag_at(cp_index).value()) {
2751     case JVM_CONSTANT_Fieldref:
2752       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2753     default:
2754       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2755   }
2756   ShouldNotReachHere();
2757   return NULL;
2758 JVM_END
2759 
2760 
2761 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2762   JVMWrapper("JVM_GetCPClassNameUTF");
2763   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2764   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2765   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2766   Symbol* classname = cp->klass_name_at(cp_index);
2767   return classname->as_utf8();
2768 JVM_END
2769 
2770 
2771 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2772   JVMWrapper("JVM_GetCPFieldClassNameUTF");
2773   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2774   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2775   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2776   switch (cp->tag_at(cp_index).value()) {
2777     case JVM_CONSTANT_Fieldref: {
2778       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2779       Symbol* classname = cp->klass_name_at(class_index);
2780       return classname->as_utf8();
2781     }
2782     default:
2783       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2784   }
2785   ShouldNotReachHere();
2786   return NULL;
2787 JVM_END
2788 
2789 
2790 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2791   JVMWrapper("JVM_GetCPMethodClassNameUTF");
2792   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2793   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2794   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2795   switch (cp->tag_at(cp_index).value()) {
2796     case JVM_CONSTANT_Methodref:
2797     case JVM_CONSTANT_InterfaceMethodref: {
2798       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2799       Symbol* classname = cp->klass_name_at(class_index);
2800       return classname->as_utf8();
2801     }
2802     default:
2803       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2804   }
2805   ShouldNotReachHere();
2806   return NULL;
2807 JVM_END
2808 
2809 
2810 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2811   JVMWrapper("JVM_GetCPFieldModifiers");
2812   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2813   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2814   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2815   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2816   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2817   ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2818   switch (cp->tag_at(cp_index).value()) {
2819     case JVM_CONSTANT_Fieldref: {
2820       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2821       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2822       InstanceKlass* ik = InstanceKlass::cast(k_called);
2823       for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2824         if (fs.name() == name && fs.signature() == signature) {
2825           return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2826         }
2827       }
2828       return -1;
2829     }
2830     default:
2831       fatal("JVM_GetCPFieldModifiers: illegal constant");
2832   }
2833   ShouldNotReachHere();
2834   return 0;
2835 JVM_END
2836 
2837 
2838 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2839   JVMWrapper("JVM_GetCPMethodModifiers");
2840   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2841   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2842   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2843   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2844   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2845   switch (cp->tag_at(cp_index).value()) {
2846     case JVM_CONSTANT_Methodref:
2847     case JVM_CONSTANT_InterfaceMethodref: {
2848       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2849       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2850       Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2851       int methods_count = methods->length();
2852       for (int i = 0; i < methods_count; i++) {
2853         Method* method = methods->at(i);
2854         if (method->name() == name && method->signature() == signature) {
2855             return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2856         }
2857       }
2858       return -1;
2859     }
2860     default:
2861       fatal("JVM_GetCPMethodModifiers: illegal constant");
2862   }
2863   ShouldNotReachHere();
2864   return 0;
2865 JVM_END
2866 
2867 
2868 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2869 
2870 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2871   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2872 JVM_END
2873 
2874 
2875 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2876   JVMWrapper("JVM_IsSameClassPackage");
2877   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2878   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2879   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2880   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2881   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2882 JVM_END
2883 
2884 // Printing support //////////////////////////////////////////////////
2885 extern "C" {
2886 
2887 ATTRIBUTE_PRINTF(3, 0)
2888 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2889   // Reject count values that are negative signed values converted to
2890   // unsigned; see bug 4399518, 4417214
2891   if ((intptr_t)count <= 0) return -1;
2892 
2893   int result = os::vsnprintf(str, count, fmt, args);
2894   if (result > 0 && (size_t)result >= count) {
2895     result = -1;
2896   }
2897 
2898   return result;
2899 }
2900 
2901 ATTRIBUTE_PRINTF(3, 4)
2902 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2903   va_list args;
2904   int len;
2905   va_start(args, fmt);
2906   len = jio_vsnprintf(str, count, fmt, args);
2907   va_end(args);
2908   return len;
2909 }
2910 
2911 ATTRIBUTE_PRINTF(2, 3)
2912 int jio_fprintf(FILE* f, const char *fmt, ...) {
2913   int len;
2914   va_list args;
2915   va_start(args, fmt);
2916   len = jio_vfprintf(f, fmt, args);
2917   va_end(args);
2918   return len;
2919 }
2920 
2921 ATTRIBUTE_PRINTF(2, 0)
2922 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2923   if (Arguments::vfprintf_hook() != NULL) {
2924      return Arguments::vfprintf_hook()(f, fmt, args);
2925   } else {
2926     return vfprintf(f, fmt, args);
2927   }
2928 }
2929 
2930 ATTRIBUTE_PRINTF(1, 2)
2931 JNIEXPORT int jio_printf(const char *fmt, ...) {
2932   int len;
2933   va_list args;
2934   va_start(args, fmt);
2935   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2936   va_end(args);
2937   return len;
2938 }
2939 
2940 // HotSpot specific jio method
2941 void jio_print(const char* s, size_t len) {
2942   // Try to make this function as atomic as possible.
2943   if (Arguments::vfprintf_hook() != NULL) {
2944     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2945   } else {
2946     // Make an unused local variable to avoid warning from gcc compiler.
2947     size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2948   }
2949 }
2950 
2951 } // Extern C
2952 
2953 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2954 
2955 // In most of the JVM thread support functions we need to access the
2956 // thread through a ThreadsListHandle to prevent it from exiting and
2957 // being reclaimed while we try to operate on it. The exceptions to this
2958 // rule are when operating on the current thread, or if the monitor of
2959 // the target java.lang.Thread is locked at the Java level - in both
2960 // cases the target cannot exit.
2961 
2962 static void thread_entry(JavaThread* thread, TRAPS) {
2963   HandleMark hm(THREAD);
2964   Handle obj(THREAD, thread->threadObj());
2965   JavaValue result(T_VOID);
2966   JavaCalls::call_virtual(&result,
2967                           obj,
2968                           SystemDictionary::Thread_klass(),
2969                           vmSymbols::run_method_name(),
2970                           vmSymbols::void_method_signature(),
2971                           THREAD);
2972 }
2973 
2974 
2975 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2976   JVMWrapper("JVM_StartThread");
2977   JavaThread *native_thread = NULL;
2978 
2979   // We cannot hold the Threads_lock when we throw an exception,
2980   // due to rank ordering issues. Example:  we might need to grab the
2981   // Heap_lock while we construct the exception.
2982   bool throw_illegal_thread_state = false;
2983 
2984   // We must release the Threads_lock before we can post a jvmti event
2985   // in Thread::start.
2986   {
2987     // Ensure that the C++ Thread and OSThread structures aren't freed before
2988     // we operate.
2989     MutexLocker mu(Threads_lock);
2990 
2991     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2992     // re-starting an already started thread, so we should usually find
2993     // that the JavaThread is null. However for a JNI attached thread
2994     // there is a small window between the Thread object being created
2995     // (with its JavaThread set) and the update to its threadStatus, so we
2996     // have to check for this
2997     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2998       throw_illegal_thread_state = true;
2999     } else {
3000       // We could also check the stillborn flag to see if this thread was already stopped, but
3001       // for historical reasons we let the thread detect that itself when it starts running
3002 
3003       jlong size =
3004              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3005       // Allocate the C++ Thread structure and create the native thread.  The
3006       // stack size retrieved from java is 64-bit signed, but the constructor takes
3007       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3008       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3009       //  - Avoid passing negative values which would result in really large stacks.
3010       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3011       size_t sz = size > 0 ? (size_t) size : 0;
3012       native_thread = new JavaThread(&thread_entry, sz);
3013 
3014       // At this point it may be possible that no osthread was created for the
3015       // JavaThread due to lack of memory. Check for this situation and throw
3016       // an exception if necessary. Eventually we may want to change this so
3017       // that we only grab the lock if the thread was created successfully -
3018       // then we can also do this check and throw the exception in the
3019       // JavaThread constructor.
3020       if (native_thread->osthread() != NULL) {
3021         // Note: the current thread is not being used within "prepare".
3022         native_thread->prepare(jthread);
3023       }
3024     }
3025   }
3026 
3027   if (throw_illegal_thread_state) {
3028     THROW(vmSymbols::java_lang_IllegalThreadStateException());
3029   }
3030 
3031   assert(native_thread != NULL, "Starting null thread?");
3032 
3033   if (native_thread->osthread() == NULL) {
3034     // No one should hold a reference to the 'native_thread'.
3035     native_thread->smr_delete();
3036     if (JvmtiExport::should_post_resource_exhausted()) {
3037       JvmtiExport::post_resource_exhausted(
3038         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3039         os::native_thread_creation_failed_msg());
3040     }
3041     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3042               os::native_thread_creation_failed_msg());
3043   }
3044 
3045 #if INCLUDE_JFR
3046   if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() &&
3047       EventThreadStart::is_stacktrace_enabled()) {
3048     JfrThreadLocal* tl = native_thread->jfr_thread_local();
3049     // skip Thread.start() and Thread.start0()
3050     tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3051   }
3052 #endif
3053 
3054   Thread::start(native_thread);
3055 
3056 JVM_END
3057 
3058 
3059 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3060 // before the quasi-asynchronous exception is delivered.  This is a little obtrusive,
3061 // but is thought to be reliable and simple. In the case, where the receiver is the
3062 // same thread as the sender, no VM_Operation is needed.
3063 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3064   JVMWrapper("JVM_StopThread");
3065 
3066   // A nested ThreadsListHandle will grab the Threads_lock so create
3067   // tlh before we resolve throwable.
3068   ThreadsListHandle tlh(thread);
3069   oop java_throwable = JNIHandles::resolve(throwable);
3070   if (java_throwable == NULL) {
3071     THROW(vmSymbols::java_lang_NullPointerException());
3072   }
3073   oop java_thread = NULL;
3074   JavaThread* receiver = NULL;
3075   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3076   Events::log_exception(thread,
3077                         "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3078                         p2i(receiver), p2i(java_thread), p2i(throwable));
3079 
3080   if (is_alive) {
3081     // jthread refers to a live JavaThread.
3082     if (thread == receiver) {
3083       // Exception is getting thrown at self so no VM_Operation needed.
3084       THROW_OOP(java_throwable);
3085     } else {
3086       // Use a VM_Operation to throw the exception.
3087       Thread::send_async_exception(java_thread, java_throwable);
3088     }
3089   } else {
3090     // Either:
3091     // - target thread has not been started before being stopped, or
3092     // - target thread already terminated
3093     // We could read the threadStatus to determine which case it is
3094     // but that is overkill as it doesn't matter. We must set the
3095     // stillborn flag for the first case, and if the thread has already
3096     // exited setting this flag has no effect.
3097     java_lang_Thread::set_stillborn(java_thread);
3098   }
3099 JVM_END
3100 
3101 
3102 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3103   JVMWrapper("JVM_IsThreadAlive");
3104 
3105   oop thread_oop = JNIHandles::resolve_non_null(jthread);
3106   return java_lang_Thread::is_alive(thread_oop);
3107 JVM_END
3108 
3109 
3110 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3111   JVMWrapper("JVM_SuspendThread");
3112 
3113   ThreadsListHandle tlh(thread);
3114   JavaThread* receiver = NULL;
3115   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3116   if (is_alive) {
3117     // jthread refers to a live JavaThread.
3118     {
3119       MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3120       if (receiver->is_external_suspend()) {
3121         // Don't allow nested external suspend requests. We can't return
3122         // an error from this interface so just ignore the problem.
3123         return;
3124       }
3125       if (receiver->is_exiting()) { // thread is in the process of exiting
3126         return;
3127       }
3128       receiver->set_external_suspend();
3129     }
3130 
3131     // java_suspend() will catch threads in the process of exiting
3132     // and will ignore them.
3133     receiver->java_suspend();
3134 
3135     // It would be nice to have the following assertion in all the
3136     // time, but it is possible for a racing resume request to have
3137     // resumed this thread right after we suspended it. Temporarily
3138     // enable this assertion if you are chasing a different kind of
3139     // bug.
3140     //
3141     // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3142     //   receiver->is_being_ext_suspended(), "thread is not suspended");
3143   }
3144 JVM_END
3145 
3146 
3147 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3148   JVMWrapper("JVM_ResumeThread");
3149 
3150   ThreadsListHandle tlh(thread);
3151   JavaThread* receiver = NULL;
3152   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3153   if (is_alive) {
3154     // jthread refers to a live JavaThread.
3155 
3156     // This is the original comment for this Threads_lock grab:
3157     //   We need to *always* get the threads lock here, since this operation cannot be allowed during
3158     //   a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3159     //   threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3160     //   looks at it.
3161     //
3162     // The above comment dates back to when we had both internal and
3163     // external suspend APIs that shared a common underlying mechanism.
3164     // External suspend is now entirely cooperative and doesn't share
3165     // anything with internal suspend. That said, there are some
3166     // assumptions in the VM that an external resume grabs the
3167     // Threads_lock. We can't drop the Threads_lock grab here until we
3168     // resolve the assumptions that exist elsewhere.
3169     //
3170     MutexLocker ml(Threads_lock);
3171     receiver->java_resume();
3172   }
3173 JVM_END
3174 
3175 
3176 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3177   JVMWrapper("JVM_SetThreadPriority");
3178 
3179   ThreadsListHandle tlh(thread);
3180   oop java_thread = NULL;
3181   JavaThread* receiver = NULL;
3182   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3183   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3184 
3185   if (is_alive) {
3186     // jthread refers to a live JavaThread.
3187     Thread::set_priority(receiver, (ThreadPriority)prio);
3188   }
3189   // Implied else: If the JavaThread hasn't started yet, then the
3190   // priority set in the java.lang.Thread object above will be pushed
3191   // down when it does start.
3192 JVM_END
3193 
3194 
3195 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3196   JVMWrapper("JVM_Yield");
3197   if (os::dont_yield()) return;
3198   HOTSPOT_THREAD_YIELD();
3199   os::naked_yield();
3200 JVM_END
3201 
3202 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3203   assert(event != NULL, "invariant");
3204   assert(event->should_commit(), "invariant");
3205   event->set_time(millis);
3206   event->commit();
3207 }
3208 
3209 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3210   JVMWrapper("JVM_Sleep");
3211 
3212   if (millis < 0) {
3213     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3214   }
3215 
3216   if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3217     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3218   }
3219 
3220   // Save current thread state and restore it at the end of this block.
3221   // And set new thread state to SLEEPING.
3222   JavaThreadSleepState jtss(thread);
3223 
3224   HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3225   EventThreadSleep event;
3226 
3227   if (millis == 0) {
3228     os::naked_yield();
3229   } else {
3230     ThreadState old_state = thread->osthread()->get_state();
3231     thread->osthread()->set_state(SLEEPING);
3232     if (!thread->sleep(millis)) { // interrupted
3233       // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3234       // us while we were sleeping. We do not overwrite those.
3235       if (!HAS_PENDING_EXCEPTION) {
3236         if (event.should_commit()) {
3237           post_thread_sleep_event(&event, millis);
3238         }
3239         HOTSPOT_THREAD_SLEEP_END(1);
3240 
3241         // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3242         // to properly restore the thread state.  That's likely wrong.
3243         THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3244       }
3245     }
3246     thread->osthread()->set_state(old_state);
3247   }
3248   if (event.should_commit()) {
3249     post_thread_sleep_event(&event, millis);
3250   }
3251   HOTSPOT_THREAD_SLEEP_END(0);
3252 JVM_END
3253 
3254 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3255   JVMWrapper("JVM_CurrentThread");
3256   oop jthread = thread->threadObj();
3257   assert (thread != NULL, "no current thread!");
3258   return JNIHandles::make_local(env, jthread);
3259 JVM_END
3260 
3261 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3262   JVMWrapper("JVM_Interrupt");
3263 
3264   ThreadsListHandle tlh(thread);
3265   JavaThread* receiver = NULL;
3266   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3267   if (is_alive) {
3268     // jthread refers to a live JavaThread.
3269     receiver->interrupt();
3270   }
3271 JVM_END
3272 
3273 
3274 // Return true iff the current thread has locked the object passed in
3275 
3276 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3277   JVMWrapper("JVM_HoldsLock");
3278   assert(THREAD->is_Java_thread(), "sanity check");
3279   if (obj == NULL) {
3280     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3281   }
3282   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3283   return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3284 JVM_END
3285 
3286 
3287 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3288   JVMWrapper("JVM_DumpAllStacks");
3289   VM_PrintThreads op;
3290   VMThread::execute(&op);
3291   if (JvmtiExport::should_post_data_dump()) {
3292     JvmtiExport::post_data_dump();
3293   }
3294 JVM_END
3295 
3296 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3297   JVMWrapper("JVM_SetNativeThreadName");
3298 
3299   // We don't use a ThreadsListHandle here because the current thread
3300   // must be alive.
3301   oop java_thread = JNIHandles::resolve_non_null(jthread);
3302   JavaThread* thr = java_lang_Thread::thread(java_thread);
3303   if (thread == thr && !thr->has_attached_via_jni()) {
3304     // Thread naming is only supported for the current thread and
3305     // we don't set the name of an attached thread to avoid stepping
3306     // on other programs.
3307     ResourceMark rm(thread);
3308     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3309     os::set_native_thread_name(thread_name);
3310   }
3311 JVM_END
3312 
3313 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3314 
3315 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3316   JVMWrapper("JVM_GetClassContext");
3317   ResourceMark rm(THREAD);
3318   JvmtiVMObjectAllocEventCollector oam;
3319   vframeStream vfst(thread);
3320 
3321   if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3322     // This must only be called from SecurityManager.getClassContext
3323     Method* m = vfst.method();
3324     if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3325           m->name()          == vmSymbols::getClassContext_name() &&
3326           m->signature()     == vmSymbols::void_class_array_signature())) {
3327       THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3328     }
3329   }
3330 
3331   // Collect method holders
3332   GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3333   for (; !vfst.at_end(); vfst.security_next()) {
3334     Method* m = vfst.method();
3335     // Native frames are not returned
3336     if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3337       Klass* holder = m->method_holder();
3338       assert(holder->is_klass(), "just checking");
3339       klass_array->append(holder);
3340     }
3341   }
3342 
3343   // Create result array of type [Ljava/lang/Class;
3344   objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3345   // Fill in mirrors corresponding to method holders
3346   for (int i = 0; i < klass_array->length(); i++) {
3347     result->obj_at_put(i, klass_array->at(i)->java_mirror());
3348   }
3349 
3350   return (jobjectArray) JNIHandles::make_local(env, result);
3351 JVM_END
3352 
3353 
3354 // java.lang.Package ////////////////////////////////////////////////////////////////
3355 
3356 
3357 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3358   JVMWrapper("JVM_GetSystemPackage");
3359   ResourceMark rm(THREAD);
3360   JvmtiVMObjectAllocEventCollector oam;
3361   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3362   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3363   return (jstring) JNIHandles::make_local(result);
3364 JVM_END
3365 
3366 
3367 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3368   JVMWrapper("JVM_GetSystemPackages");
3369   JvmtiVMObjectAllocEventCollector oam;
3370   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3371   return (jobjectArray) JNIHandles::make_local(result);
3372 JVM_END
3373 
3374 
3375 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3376 
3377 
3378 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3379   JVMWrapper("JVM_GetAndClearReferencePendingList");
3380 
3381   MonitorLocker ml(Heap_lock);
3382   oop ref = Universe::reference_pending_list();
3383   if (ref != NULL) {
3384     Universe::set_reference_pending_list(NULL);
3385   }
3386   return JNIHandles::make_local(env, ref);
3387 JVM_END
3388 
3389 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3390   JVMWrapper("JVM_HasReferencePendingList");
3391   MonitorLocker ml(Heap_lock);
3392   return Universe::has_reference_pending_list();
3393 JVM_END
3394 
3395 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3396   JVMWrapper("JVM_WaitForReferencePendingList");
3397   MonitorLocker ml(Heap_lock);
3398   while (!Universe::has_reference_pending_list()) {
3399     ml.wait();
3400   }
3401 JVM_END
3402 
3403 
3404 // ObjectInputStream ///////////////////////////////////////////////////////////////
3405 
3406 // Return the first user-defined class loader up the execution stack, or null
3407 // if only code from the bootstrap or platform class loader is on the stack.
3408 
3409 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3410   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3411     vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3412     oop loader = vfst.method()->method_holder()->class_loader();
3413     if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3414       return JNIHandles::make_local(env, loader);
3415     }
3416   }
3417   return NULL;
3418 JVM_END
3419 
3420 
3421 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3422 
3423 
3424 // resolve array handle and check arguments
3425 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3426   if (arr == NULL) {
3427     THROW_0(vmSymbols::java_lang_NullPointerException());
3428   }
3429   oop a = JNIHandles::resolve_non_null(arr);
3430   if (!a->is_array()) {
3431     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3432   } else if (type_array_only && !a->is_typeArray()) {
3433     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3434   }
3435   return arrayOop(a);
3436 }
3437 
3438 
3439 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3440   JVMWrapper("JVM_GetArrayLength");
3441   arrayOop a = check_array(env, arr, false, CHECK_0);
3442   return a->length();
3443 JVM_END
3444 
3445 
3446 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3447   JVMWrapper("JVM_Array_Get");
3448   JvmtiVMObjectAllocEventCollector oam;
3449   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3450   jvalue value;
3451   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3452   oop box = Reflection::box(&value, type, CHECK_NULL);
3453   return JNIHandles::make_local(env, box);
3454 JVM_END
3455 
3456 
3457 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3458   JVMWrapper("JVM_GetPrimitiveArrayElement");
3459   jvalue value;
3460   value.i = 0; // to initialize value before getting used in CHECK
3461   arrayOop a = check_array(env, arr, true, CHECK_(value));
3462   assert(a->is_typeArray(), "just checking");
3463   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3464   BasicType wide_type = (BasicType) wCode;
3465   if (type != wide_type) {
3466     Reflection::widen(&value, type, wide_type, CHECK_(value));
3467   }
3468   return value;
3469 JVM_END
3470 
3471 
3472 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3473   JVMWrapper("JVM_SetArrayElement");
3474   arrayOop a = check_array(env, arr, false, CHECK);
3475   oop box = JNIHandles::resolve(val);
3476   jvalue value;
3477   value.i = 0; // to initialize value before getting used in CHECK
3478   BasicType value_type;
3479   if (a->is_objArray()) {
3480     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3481     value_type = Reflection::unbox_for_regular_object(box, &value);
3482   } else {
3483     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3484   }
3485   Reflection::array_set(&value, a, index, value_type, CHECK);
3486 JVM_END
3487 
3488 
3489 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3490   JVMWrapper("JVM_SetPrimitiveArrayElement");
3491   arrayOop a = check_array(env, arr, true, CHECK);
3492   assert(a->is_typeArray(), "just checking");
3493   BasicType value_type = (BasicType) vCode;
3494   Reflection::array_set(&v, a, index, value_type, CHECK);
3495 JVM_END
3496 
3497 
3498 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3499   JVMWrapper("JVM_NewArray");
3500   JvmtiVMObjectAllocEventCollector oam;
3501   oop element_mirror = JNIHandles::resolve(eltClass);
3502   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3503   return JNIHandles::make_local(env, result);
3504 JVM_END
3505 
3506 
3507 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3508   JVMWrapper("JVM_NewMultiArray");
3509   JvmtiVMObjectAllocEventCollector oam;
3510   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3511   oop element_mirror = JNIHandles::resolve(eltClass);
3512   assert(dim_array->is_typeArray(), "just checking");
3513   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3514   return JNIHandles::make_local(env, result);
3515 JVM_END
3516 
3517 
3518 // Library support ///////////////////////////////////////////////////////////////////////////
3519 
3520 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3521   //%note jvm_ct
3522   JVMWrapper("JVM_LoadLibrary");
3523   char ebuf[1024];
3524   void *load_result;
3525   {
3526     ThreadToNativeFromVM ttnfvm(thread);
3527     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3528   }
3529   if (load_result == NULL) {
3530     char msg[1024];
3531     jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3532     // Since 'ebuf' may contain a string encoded using
3533     // platform encoding scheme, we need to pass
3534     // Exceptions::unsafe_to_utf8 to the new_exception method
3535     // as the last argument. See bug 6367357.
3536     Handle h_exception =
3537       Exceptions::new_exception(thread,
3538                                 vmSymbols::java_lang_UnsatisfiedLinkError(),
3539                                 msg, Exceptions::unsafe_to_utf8);
3540 
3541     THROW_HANDLE_0(h_exception);
3542   }
3543   log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3544   return load_result;
3545 JVM_END
3546 
3547 
3548 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3549   JVMWrapper("JVM_UnloadLibrary");
3550   os::dll_unload(handle);
3551   log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3552 JVM_END
3553 
3554 
3555 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3556   JVMWrapper("JVM_FindLibraryEntry");
3557   void* find_result = os::dll_lookup(handle, name);
3558   log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3559                     find_result != NULL ? "Found" : "Failed to find",
3560                     name, p2i(handle));
3561   return find_result;
3562 JVM_END
3563 
3564 
3565 // JNI version ///////////////////////////////////////////////////////////////////////////////
3566 
3567 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3568   JVMWrapper("JVM_IsSupportedJNIVersion");
3569   return Threads::is_supported_jni_version_including_1_1(version);
3570 JVM_END
3571 
3572 
3573 // String support ///////////////////////////////////////////////////////////////////////////
3574 
3575 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3576   JVMWrapper("JVM_InternString");
3577   JvmtiVMObjectAllocEventCollector oam;
3578   if (str == NULL) return NULL;
3579   oop string = JNIHandles::resolve_non_null(str);
3580   oop result = StringTable::intern(string, CHECK_NULL);
3581   return (jstring) JNIHandles::make_local(env, result);
3582 JVM_END
3583 
3584 
3585 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3586 
3587 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3588 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3589 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3590 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3591 // nature. JavaThreads will be "in native" when using this API from JDK code.
3592 
3593 
3594 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3595   VM_Exit::block_if_vm_exited();
3596   JVMWrapper("JVM_RawMonitorCreate");
3597   return new os::PlatformMutex();
3598 }
3599 
3600 
3601 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3602   VM_Exit::block_if_vm_exited();
3603   JVMWrapper("JVM_RawMonitorDestroy");
3604   delete ((os::PlatformMutex*) mon);
3605 }
3606 
3607 
3608 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3609   VM_Exit::block_if_vm_exited();
3610   JVMWrapper("JVM_RawMonitorEnter");
3611   ((os::PlatformMutex*) mon)->lock();
3612   return 0;
3613 }
3614 
3615 
3616 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3617   VM_Exit::block_if_vm_exited();
3618   JVMWrapper("JVM_RawMonitorExit");
3619   ((os::PlatformMutex*) mon)->unlock();
3620 }
3621 
3622 
3623 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3624 
3625 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3626                                     Handle loader, Handle protection_domain,
3627                                     jboolean throwError, TRAPS) {
3628   // Security Note:
3629   //   The Java level wrapper will perform the necessary security check allowing
3630   //   us to pass the NULL as the initiating class loader.  The VM is responsible for
3631   //   the checkPackageAccess relative to the initiating class loader via the
3632   //   protection_domain. The protection_domain is passed as NULL by the java code
3633   //   if there is no security manager in 3-arg Class.forName().
3634   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3635 
3636   // Check if we should initialize the class
3637   if (init && klass->is_instance_klass()) {
3638     klass->initialize(CHECK_NULL);
3639   }
3640   return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3641 }
3642 
3643 
3644 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3645 
3646 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3647   JVMWrapper("JVM_InvokeMethod");
3648   Handle method_handle;
3649   if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3650     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3651     Handle receiver(THREAD, JNIHandles::resolve(obj));
3652     objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3653     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3654     jobject res = JNIHandles::make_local(env, result);
3655     if (JvmtiExport::should_post_vm_object_alloc()) {
3656       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3657       assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3658       if (java_lang_Class::is_primitive(ret_type)) {
3659         // Only for primitive type vm allocates memory for java object.
3660         // See box() method.
3661         JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3662       }
3663     }
3664     return res;
3665   } else {
3666     THROW_0(vmSymbols::java_lang_StackOverflowError());
3667   }
3668 JVM_END
3669 
3670 
3671 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3672   JVMWrapper("JVM_NewInstanceFromConstructor");
3673   oop constructor_mirror = JNIHandles::resolve(c);
3674   objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3675   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3676   jobject res = JNIHandles::make_local(env, result);
3677   if (JvmtiExport::should_post_vm_object_alloc()) {
3678     JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3679   }
3680   return res;
3681 JVM_END
3682 
3683 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3684 
3685 JVM_LEAF(jboolean, JVM_SupportsCX8())
3686   JVMWrapper("JVM_SupportsCX8");
3687   return VM_Version::supports_cx8();
3688 JVM_END
3689 
3690 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3691   JVMWrapper("JVM_InitializeFromArchive");
3692   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3693   assert(k->is_klass(), "just checking");
3694   HeapShared::initialize_from_archived_subgraph(k);
3695 JVM_END
3696 
3697 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3698                                               jclass caller,
3699                                               jstring invokedName,
3700                                               jobject invokedType,
3701                                               jobject methodType,
3702                                               jobject implMethodMember,
3703                                               jobject instantiatedMethodType,
3704                                               jclass lambdaProxyClass))
3705   JVMWrapper("JVM_RegisterLambdaProxyClassForArchiving");
3706   if (!DynamicDumpSharedSpaces) {
3707     return;
3708   }
3709 
3710   Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3711   InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3712   if (caller_ik->is_hidden() || caller_ik->is_unsafe_anonymous()) {
3713     // VM anonymous classes and hidden classes not of type lambda proxy classes are currently not being archived.
3714     // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3715     // registered for archiving.
3716     return;
3717   }
3718   Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3719   InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3720   assert(lambda_ik->is_hidden(), "must be a hidden class");
3721   assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3722 
3723   Symbol* invoked_name = NULL;
3724   if (invokedName != NULL) {
3725     invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3726   }
3727   Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3728   Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3729 
3730   Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3731   Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3732 
3733   Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3734   assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3735   Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3736 
3737   Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3738   Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3739 
3740   SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, invoked_name, invoked_type,
3741                                                  method_type, m, instantiated_method_type);
3742 
3743 JVM_END
3744 
3745 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3746                                                         jclass caller,
3747                                                         jstring invokedName,
3748                                                         jobject invokedType,
3749                                                         jobject methodType,
3750                                                         jobject implMethodMember,
3751                                                         jobject instantiatedMethodType,
3752                                                         jboolean initialize))
3753   JVMWrapper("JVM_LookupLambdaProxyClassFromArchive");
3754   if (!DynamicArchive::is_mapped()) {
3755     return NULL;
3756   }
3757 
3758   if (invokedName == NULL || invokedType == NULL || methodType == NULL ||
3759       implMethodMember == NULL || instantiatedMethodType == NULL) {
3760     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3761   }
3762 
3763   Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3764   InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3765   if (!caller_ik->is_shared()) {
3766     // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3767     return NULL;
3768   }
3769 
3770   Symbol* invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3771   Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3772   Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3773 
3774   Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3775   Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3776 
3777   Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3778   assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3779   Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3780 
3781   Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3782   Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3783 
3784   InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, invoked_name, invoked_type,
3785                                                                                    method_type, m, instantiated_method_type);
3786   jclass jcls = NULL;
3787   if (lambda_ik != NULL) {
3788     InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, initialize, THREAD);
3789     jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(env, loaded_lambda->java_mirror());
3790   }
3791   return jcls;
3792 JVM_END
3793 
3794 JVM_ENTRY(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3795     JVMWrapper("JVM_IsCDSDumpingEnable");
3796     return DynamicDumpSharedSpaces;
3797 JVM_END
3798 
3799 JVM_ENTRY(jboolean, JVM_IsCDSSharingEnabled(JNIEnv* env))
3800     JVMWrapper("JVM_IsCDSSharingEnable");
3801     return UseSharedSpaces;
3802 JVM_END
3803 
3804 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump())
3805   JVMWrapper("JVM_GetRandomSeedForCDSDump");
3806   if (DumpSharedSpaces) {
3807     const char* release = Abstract_VM_Version::vm_release();
3808     const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
3809     const char* version = VM_Version::internal_vm_info_string();
3810     jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3811                          java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3812                          java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3813     seed += (jlong)Abstract_VM_Version::vm_major_version();
3814     seed += (jlong)Abstract_VM_Version::vm_minor_version();
3815     seed += (jlong)Abstract_VM_Version::vm_security_version();
3816     seed += (jlong)Abstract_VM_Version::vm_patch_version();
3817     if (seed == 0) { // don't let this ever be zero.
3818       seed = 0x87654321;
3819     }
3820     log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed);
3821     return seed;
3822   } else {
3823     return 0;
3824   }
3825 JVM_END
3826 
3827 // Returns an array of all live Thread objects (VM internal JavaThreads,
3828 // jvmti agent threads, and JNI attaching threads  are skipped)
3829 // See CR 6404306 regarding JNI attaching threads
3830 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3831   ResourceMark rm(THREAD);
3832   ThreadsListEnumerator tle(THREAD, false, false);
3833   JvmtiVMObjectAllocEventCollector oam;
3834 
3835   int num_threads = tle.num_threads();
3836   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3837   objArrayHandle threads_ah(THREAD, r);
3838 
3839   for (int i = 0; i < num_threads; i++) {
3840     Handle h = tle.get_threadObj(i);
3841     threads_ah->obj_at_put(i, h());
3842   }
3843 
3844   return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3845 JVM_END
3846 
3847 
3848 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3849 // Return StackTraceElement[][], each element is the stack trace of a thread in
3850 // the corresponding entry in the given threads array
3851 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3852   JVMWrapper("JVM_DumpThreads");
3853   JvmtiVMObjectAllocEventCollector oam;
3854 
3855   // Check if threads is null
3856   if (threads == NULL) {
3857     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3858   }
3859 
3860   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3861   objArrayHandle ah(THREAD, a);
3862   int num_threads = ah->length();
3863   // check if threads is non-empty array
3864   if (num_threads == 0) {
3865     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3866   }
3867 
3868   // check if threads is not an array of objects of Thread class
3869   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3870   if (k != SystemDictionary::Thread_klass()) {
3871     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3872   }
3873 
3874   ResourceMark rm(THREAD);
3875 
3876   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3877   for (int i = 0; i < num_threads; i++) {
3878     oop thread_obj = ah->obj_at(i);
3879     instanceHandle h(THREAD, (instanceOop) thread_obj);
3880     thread_handle_array->append(h);
3881   }
3882 
3883   // The JavaThread references in thread_handle_array are validated
3884   // in VM_ThreadDump::doit().
3885   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3886   return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3887 
3888 JVM_END
3889 
3890 // JVM monitoring and management support
3891 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3892   return Management::get_jmm_interface(version);
3893 JVM_END
3894 
3895 // com.sun.tools.attach.VirtualMachine agent properties support
3896 //
3897 // Initialize the agent properties with the properties maintained in the VM
3898 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3899   JVMWrapper("JVM_InitAgentProperties");
3900   ResourceMark rm;
3901 
3902   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3903 
3904   PUTPROP(props, "sun.java.command", Arguments::java_command());
3905   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3906   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3907   return properties;
3908 JVM_END
3909 
3910 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3911 {
3912   JVMWrapper("JVM_GetEnclosingMethodInfo");
3913   JvmtiVMObjectAllocEventCollector oam;
3914 
3915   if (ofClass == NULL) {
3916     return NULL;
3917   }
3918   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3919   // Special handling for primitive objects
3920   if (java_lang_Class::is_primitive(mirror())) {
3921     return NULL;
3922   }
3923   Klass* k = java_lang_Class::as_Klass(mirror());
3924   if (!k->is_instance_klass()) {
3925     return NULL;
3926   }
3927   InstanceKlass* ik = InstanceKlass::cast(k);
3928   int encl_method_class_idx = ik->enclosing_method_class_index();
3929   if (encl_method_class_idx == 0) {
3930     return NULL;
3931   }
3932   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3933   objArrayHandle dest(THREAD, dest_o);
3934   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3935   dest->obj_at_put(0, enc_k->java_mirror());
3936   int encl_method_method_idx = ik->enclosing_method_method_index();
3937   if (encl_method_method_idx != 0) {
3938     Symbol* sym = ik->constants()->symbol_at(
3939                         extract_low_short_from_int(
3940                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3941     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3942     dest->obj_at_put(1, str());
3943     sym = ik->constants()->symbol_at(
3944               extract_high_short_from_int(
3945                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3946     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3947     dest->obj_at_put(2, str());
3948   }
3949   return (jobjectArray) JNIHandles::make_local(dest());
3950 }
3951 JVM_END
3952 
3953 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3954 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3955   ResourceMark rm(THREAD);
3956 
3957   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3958     return NULL;
3959   }
3960 
3961   char** vm_flags = Arguments::jvm_flags_array();
3962   char** vm_args = Arguments::jvm_args_array();
3963   int num_flags = Arguments::num_jvm_flags();
3964   int num_args = Arguments::num_jvm_args();
3965 
3966   InstanceKlass* ik = SystemDictionary::String_klass();
3967   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3968   objArrayHandle result_h(THREAD, r);
3969 
3970   int index = 0;
3971   for (int j = 0; j < num_flags; j++, index++) {
3972     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3973     result_h->obj_at_put(index, h());
3974   }
3975   for (int i = 0; i < num_args; i++, index++) {
3976     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3977     result_h->obj_at_put(index, h());
3978   }
3979   return (jobjectArray) JNIHandles::make_local(env, result_h());
3980 JVM_END
3981 
3982 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3983   return os::get_signal_number(name);
3984 JVM_END