1 /*
   2  * Copyright (c) 1997, 2019, 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.inline.hpp"
  30 #include "classfile/javaAssertions.hpp"
  31 #include "classfile/javaClasses.inline.hpp"
  32 #include "classfile/moduleEntry.hpp"
  33 #include "classfile/modules.hpp"
  34 #include "classfile/packageEntry.hpp"
  35 #include "classfile/stringTable.hpp"
  36 #include "classfile/systemDictionary.hpp"
  37 #include "classfile/vmSymbols.hpp"
  38 #include "gc/shared/collectedHeap.inline.hpp"
  39 #include "interpreter/bytecode.hpp"
  40 #include "jfr/jfrEvents.hpp"
  41 #include "logging/log.hpp"
  42 #include "memory/heapShared.hpp"
  43 #include "memory/oopFactory.hpp"
  44 #include "memory/referenceType.hpp"
  45 #include "memory/resourceArea.hpp"
  46 #include "memory/universe.hpp"
  47 #include "oops/access.inline.hpp"
  48 #include "oops/constantPool.hpp"
  49 #include "oops/fieldStreams.hpp"
  50 #include "oops/instanceKlass.hpp"
  51 #include "oops/method.hpp"
  52 #include "oops/objArrayKlass.hpp"
  53 #include "oops/objArrayOop.inline.hpp"
  54 #include "oops/oop.inline.hpp"
  55 #include "prims/jvm_misc.hpp"
  56 #include "prims/jvmtiExport.hpp"
  57 #include "prims/jvmtiThreadState.hpp"
  58 #include "prims/nativeLookup.hpp"
  59 #include "prims/stackwalk.hpp"
  60 #include "runtime/arguments.hpp"
  61 #include "runtime/atomic.hpp"
  62 #include "runtime/handles.inline.hpp"
  63 #include "runtime/init.hpp"
  64 #include "runtime/interfaceSupport.inline.hpp"
  65 #include "runtime/deoptimization.hpp"
  66 #include "runtime/java.hpp"
  67 #include "runtime/javaCalls.hpp"
  68 #include "runtime/jfieldIDWorkaround.hpp"
  69 #include "runtime/jniHandles.inline.hpp"
  70 #include "runtime/orderAccess.hpp"
  71 #include "runtime/os.inline.hpp"
  72 #include "runtime/perfData.hpp"
  73 #include "runtime/reflection.hpp"
  74 #include "runtime/thread.inline.hpp"
  75 #include "runtime/threadSMR.hpp"
  76 #include "runtime/vframe.inline.hpp"
  77 #include "runtime/vmOperations.hpp"
  78 #include "runtime/vm_version.hpp"
  79 #include "services/attachListener.hpp"
  80 #include "services/management.hpp"
  81 #include "services/threadService.hpp"
  82 #include "utilities/copy.hpp"
  83 #include "utilities/defaultStream.hpp"
  84 #include "utilities/dtrace.hpp"
  85 #include "utilities/events.hpp"
  86 #include "utilities/histogram.hpp"
  87 #include "utilities/macros.hpp"
  88 #include "utilities/utf8.hpp"
  89 #if INCLUDE_CDS
  90 #include "classfile/systemDictionaryShared.hpp"
  91 #endif
  92 
  93 #include <errno.h>
  94 
  95 /*
  96   NOTE about use of any ctor or function call that can trigger a safepoint/GC:
  97   such ctors and calls MUST NOT come between an oop declaration/init and its
  98   usage because if objects are move this may cause various memory stomps, bus
  99   errors and segfaults. Here is a cookbook for causing so called "naked oop
 100   failures":
 101 
 102       JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
 103           JVMWrapper("JVM_GetClassDeclaredFields");
 104 
 105           // Object address to be held directly in mirror & not visible to GC
 106           oop mirror = JNIHandles::resolve_non_null(ofClass);
 107 
 108           // If this ctor can hit a safepoint, moving objects around, then
 109           ComplexConstructor foo;
 110 
 111           // Boom! mirror may point to JUNK instead of the intended object
 112           (some dereference of mirror)
 113 
 114           // Here's another call that may block for GC, making mirror stale
 115           MutexLocker ml(some_lock);
 116 
 117           // And here's an initializer that can result in a stale oop
 118           // all in one step.
 119           oop o = call_that_can_throw_exception(TRAPS);
 120 
 121 
 122   The solution is to keep the oop declaration BELOW the ctor or function
 123   call that might cause a GC, do another resolve to reassign the oop, or
 124   consider use of a Handle instead of an oop so there is immunity from object
 125   motion. But note that the "QUICK" entries below do not have a handlemark
 126   and thus can only support use of handles passed in.
 127 */
 128 
 129 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
 130   ResourceMark rm;
 131   int line_number = -1;
 132   const char * source_file = NULL;
 133   const char * trace = "explicit";
 134   InstanceKlass* caller = NULL;
 135   JavaThread* jthread = JavaThread::current();
 136   if (jthread->has_last_Java_frame()) {
 137     vframeStream vfst(jthread);
 138 
 139     // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
 140     TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
 141     Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
 142     TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
 143     Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
 144 
 145     Method* last_caller = NULL;
 146 
 147     while (!vfst.at_end()) {
 148       Method* m = vfst.method();
 149       if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
 150           !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
 151           !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
 152         break;
 153       }
 154       last_caller = m;
 155       vfst.next();
 156     }
 157     // if this is called from Class.forName0 and that is called from Class.forName,
 158     // then print the caller of Class.forName.  If this is Class.loadClass, then print
 159     // that caller, otherwise keep quiet since this should be picked up elsewhere.
 160     bool found_it = false;
 161     if (!vfst.at_end() &&
 162         vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 163         vfst.method()->name() == vmSymbols::forName0_name()) {
 164       vfst.next();
 165       if (!vfst.at_end() &&
 166           vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 167           vfst.method()->name() == vmSymbols::forName_name()) {
 168         vfst.next();
 169         found_it = true;
 170       }
 171     } else if (last_caller != NULL &&
 172                last_caller->method_holder()->name() ==
 173                  vmSymbols::java_lang_ClassLoader() &&
 174                last_caller->name() == vmSymbols::loadClass_name()) {
 175       found_it = true;
 176     } else if (!vfst.at_end()) {
 177       if (vfst.method()->is_native()) {
 178         // JNI call
 179         found_it = true;
 180       }
 181     }
 182     if (found_it && !vfst.at_end()) {
 183       // found the caller
 184       caller = vfst.method()->method_holder();
 185       line_number = vfst.method()->line_number_from_bci(vfst.bci());
 186       if (line_number == -1) {
 187         // show method name if it's a native method
 188         trace = vfst.method()->name_and_sig_as_C_string();
 189       }
 190       Symbol* s = caller->source_file_name();
 191       if (s != NULL) {
 192         source_file = s->as_C_string();
 193       }
 194     }
 195   }
 196   if (caller != NULL) {
 197     if (to_class != caller) {
 198       const char * from = caller->external_name();
 199       const char * to = to_class->external_name();
 200       // print in a single call to reduce interleaving between threads
 201       if (source_file != NULL) {
 202         log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
 203       } else {
 204         log_debug(class, resolve)("%s %s (%s)", from, to, trace);
 205       }
 206     }
 207   }
 208 }
 209 
 210 void trace_class_resolution(Klass* to_class) {
 211   EXCEPTION_MARK;
 212   trace_class_resolution_impl(to_class, THREAD);
 213   if (HAS_PENDING_EXCEPTION) {
 214     CLEAR_PENDING_EXCEPTION;
 215   }
 216 }
 217 
 218 // Wrapper to trace JVM functions
 219 
 220 #ifdef ASSERT
 221   Histogram* JVMHistogram;
 222   volatile int JVMHistogram_lock = 0;
 223 
 224   class JVMHistogramElement : public HistogramElement {
 225     public:
 226      JVMHistogramElement(const char* name);
 227   };
 228 
 229   JVMHistogramElement::JVMHistogramElement(const char* elementName) {
 230     _name = elementName;
 231     uintx count = 0;
 232 
 233     while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
 234       while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
 235         count +=1;
 236         if ( (WarnOnStalledSpinLock > 0)
 237           && (count % WarnOnStalledSpinLock == 0)) {
 238           warning("JVMHistogram_lock seems to be stalled");
 239         }
 240       }
 241      }
 242 
 243     if(JVMHistogram == NULL)
 244       JVMHistogram = new Histogram("JVM Call Counts",100);
 245 
 246     JVMHistogram->add_element(this);
 247     Atomic::dec(&JVMHistogram_lock);
 248   }
 249 
 250   #define JVMCountWrapper(arg) \
 251       static JVMHistogramElement* e = new JVMHistogramElement(arg); \
 252       if (e != NULL) e->increment_count();  // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
 253 
 254   #define JVMWrapper(arg) JVMCountWrapper(arg);
 255 #else
 256   #define JVMWrapper(arg)
 257 #endif
 258 
 259 
 260 // Interface version /////////////////////////////////////////////////////////////////////
 261 
 262 
 263 JVM_LEAF(jint, JVM_GetInterfaceVersion())
 264   return JVM_INTERFACE_VERSION;
 265 JVM_END
 266 
 267 
 268 // java.lang.System //////////////////////////////////////////////////////////////////////
 269 
 270 
 271 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
 272   JVMWrapper("JVM_CurrentTimeMillis");
 273   return os::javaTimeMillis();
 274 JVM_END
 275 
 276 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
 277   JVMWrapper("JVM_NanoTime");
 278   return os::javaTimeNanos();
 279 JVM_END
 280 
 281 // The function below is actually exposed by jdk.internal.misc.VM and not
 282 // java.lang.System, but we choose to keep it here so that it stays next
 283 // to JVM_CurrentTimeMillis and JVM_NanoTime
 284 
 285 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); //  2^32
 286 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
 287 
 288 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
 289   JVMWrapper("JVM_GetNanoTimeAdjustment");
 290   jlong seconds;
 291   jlong nanos;
 292 
 293   os::javaTimeSystemUTC(seconds, nanos);
 294 
 295   // We're going to verify that the result can fit in a long.
 296   // For that we need the difference in seconds between 'seconds'
 297   // and 'offset_secs' to be such that:
 298   //     |seconds - offset_secs| < (2^63/10^9)
 299   // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
 300   // which makes |seconds - offset_secs| < 2^33
 301   // and we will prefer +/- 2^32 as the maximum acceptable diff
 302   // as 2^32 has a more natural feel than 2^33...
 303   //
 304   // So if |seconds - offset_secs| >= 2^32 - we return a special
 305   // sentinel value (-1) which the caller should take as an
 306   // exception value indicating that the offset given to us is
 307   // too far from range of the current time - leading to too big
 308   // a nano adjustment. The caller is expected to recover by
 309   // computing a more accurate offset and calling this method
 310   // again. (For the record 2^32 secs is ~136 years, so that
 311   // should rarely happen)
 312   //
 313   jlong diff = seconds - offset_secs;
 314   if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
 315      return -1; // sentinel value: the offset is too far off the target
 316   }
 317 
 318   // return the adjustment. If you compute a time by adding
 319   // this number of nanoseconds along with the number of seconds
 320   // in the offset you should get the current UTC time.
 321   return (diff * (jlong)1000000000) + nanos;
 322 JVM_END
 323 
 324 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
 325                                jobject dst, jint dst_pos, jint length))
 326   JVMWrapper("JVM_ArrayCopy");
 327   // Check if we have null pointers
 328   if (src == NULL || dst == NULL) {
 329     THROW(vmSymbols::java_lang_NullPointerException());
 330   }
 331   arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
 332   arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
 333   assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
 334   assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
 335   // Do copy
 336   s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
 337 JVM_END
 338 
 339 
 340 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
 341   JavaValue r(T_OBJECT);
 342   // public synchronized Object put(Object key, Object value);
 343   HandleMark hm(THREAD);
 344   Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK);
 345   Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
 346   JavaCalls::call_virtual(&r,
 347                           props,
 348                           SystemDictionary::Properties_klass(),
 349                           vmSymbols::put_name(),
 350                           vmSymbols::object_object_object_signature(),
 351                           key_str,
 352                           value_str,
 353                           THREAD);
 354 }
 355 
 356 
 357 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
 358 
 359 /*
 360  * Return all of the system properties in a Java String array with alternating
 361  * names and values from the jvm SystemProperty.
 362  * Which includes some internal and all commandline -D defined properties.
 363  */
 364 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
 365   JVMWrapper("JVM_GetProperties");
 366   ResourceMark rm(THREAD);
 367   HandleMark hm(THREAD);
 368   int ndx = 0;
 369   int fixedCount = 2;
 370 
 371   SystemProperty* p = Arguments::system_properties();
 372   int count = Arguments::PropertyList_count(p);
 373 
 374   // Allocate result String array
 375   InstanceKlass* ik = SystemDictionary::String_klass();
 376   objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
 377   objArrayHandle result_h(THREAD, r);
 378 
 379   while (p != NULL) {
 380     const char * key = p->key();
 381     if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
 382         const char * value = p->value();
 383         Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
 384         Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
 385         result_h->obj_at_put(ndx * 2,  key_str());
 386         result_h->obj_at_put(ndx * 2 + 1, value_str());
 387         ndx++;
 388     }
 389     p = p->next();
 390   }
 391 
 392   // Convert the -XX:MaxDirectMemorySize= command line flag
 393   // to the sun.nio.MaxDirectMemorySize property.
 394   // Do this after setting user properties to prevent people
 395   // from setting the value with a -D option, as requested.
 396   // Leave empty if not supplied
 397   if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
 398     char as_chars[256];
 399     jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
 400     Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
 401     Handle value_str  = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
 402     result_h->obj_at_put(ndx * 2,  key_str());
 403     result_h->obj_at_put(ndx * 2 + 1, value_str());
 404     ndx++;
 405   }
 406 
 407   // JVM monitoring and management support
 408   // Add the sun.management.compiler property for the compiler's name
 409   {
 410 #undef CSIZE
 411 #if defined(_LP64) || defined(_WIN64)
 412   #define CSIZE "64-Bit "
 413 #else
 414   #define CSIZE
 415 #endif // 64bit
 416 
 417 #ifdef TIERED
 418     const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
 419 #else
 420 #if defined(COMPILER1)
 421     const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
 422 #elif defined(COMPILER2)
 423     const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
 424 #elif INCLUDE_JVMCI
 425     #error "INCLUDE_JVMCI should imply TIERED"
 426 #else
 427     const char* compiler_name = "";
 428 #endif // compilers
 429 #endif // TIERED
 430 
 431     if (*compiler_name != '\0' &&
 432         (Arguments::mode() != Arguments::_int)) {
 433       Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
 434       Handle value_str  = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
 435       result_h->obj_at_put(ndx * 2,  key_str());
 436       result_h->obj_at_put(ndx * 2 + 1, value_str());
 437       ndx++;
 438     }
 439   }
 440 
 441   return (jobjectArray) JNIHandles::make_local(env, result_h());
 442 JVM_END
 443 
 444 
 445 /*
 446  * Return the temporary directory that the VM uses for the attach
 447  * and perf data files.
 448  *
 449  * It is important that this directory is well-known and the
 450  * same for all VM instances. It cannot be affected by configuration
 451  * variables such as java.io.tmpdir.
 452  */
 453 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 454   JVMWrapper("JVM_GetTemporaryDirectory");
 455   HandleMark hm(THREAD);
 456   const char* temp_dir = os::get_temp_directory();
 457   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 458   return (jstring) JNIHandles::make_local(env, h());
 459 JVM_END
 460 
 461 
 462 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 463 
 464 extern volatile jint vm_created;
 465 
 466 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
 467   JVMWrapper("JVM_BeforeHalt");
 468   EventShutdown event;
 469   if (event.should_commit()) {
 470     event.set_reason("Shutdown requested from Java");
 471     event.commit();
 472   }
 473 JVM_END
 474 
 475 
 476 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 477   before_exit(thread);
 478   vm_exit(code);
 479 JVM_END
 480 
 481 
 482 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 483   JVMWrapper("JVM_GC");
 484   if (!DisableExplicitGC) {
 485     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 486   }
 487 JVM_END
 488 
 489 
 490 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 491   JVMWrapper("JVM_MaxObjectInspectionAge");
 492   return Universe::heap()->millis_since_last_gc();
 493 JVM_END
 494 
 495 
 496 static inline jlong convert_size_t_to_jlong(size_t val) {
 497   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 498   NOT_LP64 (return (jlong)val;)
 499   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 500 }
 501 
 502 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 503   JVMWrapper("JVM_TotalMemory");
 504   size_t n = Universe::heap()->capacity();
 505   return convert_size_t_to_jlong(n);
 506 JVM_END
 507 
 508 
 509 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 510   JVMWrapper("JVM_FreeMemory");
 511   CollectedHeap* ch = Universe::heap();
 512   size_t n;
 513   {
 514      MutexLocker x(Heap_lock);
 515      n = ch->capacity() - ch->used();
 516   }
 517   return convert_size_t_to_jlong(n);
 518 JVM_END
 519 
 520 
 521 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 522   JVMWrapper("JVM_MaxMemory");
 523   size_t n = Universe::heap()->max_capacity();
 524   return convert_size_t_to_jlong(n);
 525 JVM_END
 526 
 527 
 528 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 529   JVMWrapper("JVM_ActiveProcessorCount");
 530   return os::active_processor_count();
 531 JVM_END
 532 
 533 
 534 
 535 // java.lang.Throwable //////////////////////////////////////////////////////
 536 
 537 
 538 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 539   JVMWrapper("JVM_FillInStackTrace");
 540   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 541   java_lang_Throwable::fill_in_stack_trace(exception);
 542 JVM_END
 543 
 544 
 545 // java.lang.StackTraceElement //////////////////////////////////////////////
 546 
 547 
 548 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
 549   JVMWrapper("JVM_InitStackTraceElementArray");
 550   Handle exception(THREAD, JNIHandles::resolve(throwable));
 551   objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
 552   objArrayHandle stack_trace(THREAD, st);
 553   // Fill in the allocated stack trace
 554   java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
 555 JVM_END
 556 
 557 
 558 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 559   JVMWrapper("JVM_InitStackTraceElement");
 560   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 561   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 562   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
 563 JVM_END
 564 
 565 
 566 // java.lang.StackWalker //////////////////////////////////////////////////////
 567 
 568 
 569 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
 570                                      jint skip_frames, jint frame_count, jint start_index,
 571                                      jobjectArray frames))
 572   JVMWrapper("JVM_CallStackWalk");
 573   JavaThread* jt = (JavaThread*) THREAD;
 574   if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
 575     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
 576   }
 577 
 578   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 579 
 580   // frames array is a Class<?>[] array when only getting caller reference,
 581   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 582   // be null.
 583   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 584   objArrayHandle frames_array_h(THREAD, fa);
 585 
 586   int limit = start_index + frame_count;
 587   if (frames_array_h->length() < limit) {
 588     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
 589   }
 590 
 591   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
 592                                start_index, frames_array_h, CHECK_NULL);
 593   return JNIHandles::make_local(env, result);
 594 JVM_END
 595 
 596 
 597 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
 598                                   jint frame_count, jint start_index,
 599                                   jobjectArray frames))
 600   JVMWrapper("JVM_MoreStackWalk");
 601   JavaThread* jt = (JavaThread*) THREAD;
 602 
 603   // frames array is a Class<?>[] array when only getting caller reference,
 604   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 605   // be null.
 606   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 607   objArrayHandle frames_array_h(THREAD, fa);
 608 
 609   int limit = start_index+frame_count;
 610   if (frames_array_h->length() < limit) {
 611     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 612   }
 613 
 614   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 615   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
 616                                    start_index, frames_array_h, THREAD);
 617 JVM_END
 618 
 619 // java.lang.Object ///////////////////////////////////////////////
 620 
 621 
 622 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 623   JVMWrapper("JVM_IHashCode");
 624   // as implemented in the classic virtual machine; return 0 if object is NULL
 625   return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
 626 JVM_END
 627 
 628 
 629 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 630   JVMWrapper("JVM_MonitorWait");
 631   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 632   JavaThreadInObjectWaitState jtiows(thread, ms != 0);
 633   if (JvmtiExport::should_post_monitor_wait()) {
 634     JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
 635 
 636     // The current thread already owns the monitor and it has not yet
 637     // been added to the wait queue so the current thread cannot be
 638     // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
 639     // event handler cannot accidentally consume an unpark() meant for
 640     // the ParkEvent associated with this ObjectMonitor.
 641   }
 642   ObjectSynchronizer::wait(obj, ms, CHECK);
 643 JVM_END
 644 
 645 
 646 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 647   JVMWrapper("JVM_MonitorNotify");
 648   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 649   ObjectSynchronizer::notify(obj, CHECK);
 650 JVM_END
 651 
 652 
 653 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 654   JVMWrapper("JVM_MonitorNotifyAll");
 655   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 656   ObjectSynchronizer::notifyall(obj, CHECK);
 657 JVM_END
 658 
 659 
 660 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 661   JVMWrapper("JVM_Clone");
 662   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 663   Klass* klass = obj->klass();
 664   JvmtiVMObjectAllocEventCollector oam;
 665 
 666 #ifdef ASSERT
 667   // Just checking that the cloneable flag is set correct
 668   if (obj->is_array()) {
 669     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 670   } else {
 671     guarantee(obj->is_instance(), "should be instanceOop");
 672     bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
 673     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 674   }
 675 #endif
 676 
 677   // Check if class of obj supports the Cloneable interface.
 678   // All arrays are considered to be cloneable (See JLS 20.1.5).
 679   // All j.l.r.Reference classes are considered non-cloneable.
 680   if (!klass->is_cloneable() ||
 681       (klass->is_instance_klass() &&
 682        InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
 683     ResourceMark rm(THREAD);
 684     THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 685   }
 686 
 687   // Make shallow object copy
 688   const int size = obj->size();
 689   oop new_obj_oop = NULL;
 690   if (obj->is_array()) {
 691     const int length = ((arrayOop)obj())->length();
 692     new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
 693                                                    /* do_zero */ true, CHECK_NULL);
 694   } else {
 695     new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
 696   }
 697 
 698   HeapAccess<>::clone(obj(), new_obj_oop, size);
 699 
 700   Handle new_obj(THREAD, new_obj_oop);
 701   // Caution: this involves a java upcall, so the clone should be
 702   // "gc-robust" by this stage.
 703   if (klass->has_finalizer()) {
 704     assert(obj->is_instance(), "should be instanceOop");
 705     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 706     new_obj = Handle(THREAD, new_obj_oop);
 707   }
 708 
 709   return JNIHandles::make_local(env, new_obj());
 710 JVM_END
 711 
 712 // java.io.File ///////////////////////////////////////////////////////////////
 713 
 714 JVM_LEAF(char*, JVM_NativePath(char* path))
 715   JVMWrapper("JVM_NativePath");
 716   return os::native_path(path);
 717 JVM_END
 718 
 719 
 720 // Misc. class handling ///////////////////////////////////////////////////////////
 721 
 722 
 723 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
 724   JVMWrapper("JVM_GetCallerClass");
 725 
 726   // Getting the class of the caller frame.
 727   //
 728   // The call stack at this point looks something like this:
 729   //
 730   // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
 731   // [1] [ @CallerSensitive API.method                                   ]
 732   // [.] [ (skipped intermediate frames)                                 ]
 733   // [n] [ caller                                                        ]
 734   vframeStream vfst(thread);
 735   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 736   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 737     Method* m = vfst.method();
 738     assert(m != NULL, "sanity");
 739     switch (n) {
 740     case 0:
 741       // This must only be called from Reflection.getCallerClass
 742       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 743         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 744       }
 745       // fall-through
 746     case 1:
 747       // Frame 0 and 1 must be caller sensitive.
 748       if (!m->caller_sensitive()) {
 749         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 750       }
 751       break;
 752     default:
 753       if (!m->is_ignored_by_security_stack_walk()) {
 754         // We have reached the desired frame; return the holder class.
 755         return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
 756       }
 757       break;
 758     }
 759   }
 760   return NULL;
 761 JVM_END
 762 
 763 
 764 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 765   JVMWrapper("JVM_FindPrimitiveClass");
 766   oop mirror = NULL;
 767   BasicType t = name2type(utf);
 768   if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
 769     mirror = Universe::java_mirror(t);
 770   }
 771   if (mirror == NULL) {
 772     THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 773   } else {
 774     return (jclass) JNIHandles::make_local(env, mirror);
 775   }
 776 JVM_END
 777 
 778 
 779 // Returns a class loaded by the bootstrap class loader; or null
 780 // if not found.  ClassNotFoundException is not thrown.
 781 // FindClassFromBootLoader is exported to the launcher for windows.
 782 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 783                                               const char* name))
 784   JVMWrapper("JVM_FindClassFromBootLoader");
 785 
 786   // Java libraries should ensure that name is never null...
 787   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 788     // It's impossible to create this class;  the name cannot fit
 789     // into the constant pool.
 790     return NULL;
 791   }
 792 
 793   TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
 794   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 795   if (k == NULL) {
 796     return NULL;
 797   }
 798 
 799   if (log_is_enabled(Debug, class, resolve)) {
 800     trace_class_resolution(k);
 801   }
 802   return (jclass) JNIHandles::make_local(env, k->java_mirror());
 803 JVM_END
 804 
 805 // Find a class with this name in this loader, using the caller's protection domain.
 806 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
 807                                           jboolean init, jobject loader,
 808                                           jclass caller))
 809   JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
 810   // Java libraries should ensure that name is never null...
 811   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 812     // It's impossible to create this class;  the name cannot fit
 813     // into the constant pool.
 814     THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
 815   }
 816 
 817   TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
 818 
 819   oop loader_oop = JNIHandles::resolve(loader);
 820   oop from_class = JNIHandles::resolve(caller);
 821   oop protection_domain = NULL;
 822   // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
 823   // NPE. Put it in another way, the bootstrap class loader has all permission and
 824   // thus no checkPackageAccess equivalence in the VM class loader.
 825   // The caller is also passed as NULL by the java code if there is no security
 826   // manager to avoid the performance cost of getting the calling class.
 827   if (from_class != NULL && loader_oop != NULL) {
 828     protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
 829   }
 830 
 831   Handle h_loader(THREAD, loader_oop);
 832   Handle h_prot(THREAD, protection_domain);
 833   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 834                                                h_prot, false, THREAD);
 835 
 836   if (log_is_enabled(Debug, class, resolve) && result != NULL) {
 837     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 838   }
 839   return result;
 840 JVM_END
 841 
 842 // Currently only called from the old verifier.
 843 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 844                                          jboolean init, jclass from))
 845   JVMWrapper("JVM_FindClassFromClass");
 846   if (name == NULL) {
 847     THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
 848   }
 849   if ((int)strlen(name) > Symbol::max_length()) {
 850     // It's impossible to create this class;  the name cannot fit
 851     // into the constant pool.
 852     Exceptions::fthrow(THREAD_AND_LOCATION,
 853                        vmSymbols::java_lang_NoClassDefFoundError(),
 854                        "Class name exceeds maximum length of %d: %s",
 855                        Symbol::max_length(),
 856                        name);
 857     return 0;
 858   }
 859   TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
 860   oop from_class_oop = JNIHandles::resolve(from);
 861   Klass* from_class = (from_class_oop == NULL)
 862                            ? (Klass*)NULL
 863                            : java_lang_Class::as_Klass(from_class_oop);
 864   oop class_loader = NULL;
 865   oop protection_domain = NULL;
 866   if (from_class != NULL) {
 867     class_loader = from_class->class_loader();
 868     protection_domain = from_class->protection_domain();
 869   }
 870   Handle h_loader(THREAD, class_loader);
 871   Handle h_prot  (THREAD, protection_domain);
 872   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 873                                                h_prot, true, thread);
 874 
 875   if (log_is_enabled(Debug, class, resolve) && result != NULL) {
 876     // this function is generally only used for class loading during verification.
 877     ResourceMark rm;
 878     oop from_mirror = JNIHandles::resolve_non_null(from);
 879     Klass* from_class = java_lang_Class::as_Klass(from_mirror);
 880     const char * from_name = from_class->external_name();
 881 
 882     oop mirror = JNIHandles::resolve_non_null(result);
 883     Klass* to_class = java_lang_Class::as_Klass(mirror);
 884     const char * to = to_class->external_name();
 885     log_debug(class, resolve)("%s %s (verification)", from_name, to);
 886   }
 887 
 888   return result;
 889 JVM_END
 890 
 891 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
 892   if (loader.is_null()) {
 893     return;
 894   }
 895 
 896   // check whether the current caller thread holds the lock or not.
 897   // If not, increment the corresponding counter
 898   if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
 899       ObjectSynchronizer::owner_self) {
 900     counter->inc();
 901   }
 902 }
 903 
 904 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
 905 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
 906                                       jobject loader, const jbyte *buf,
 907                                       jsize len, jobject pd, const char *source,
 908                                       TRAPS) {
 909   if (source == NULL)  source = "__JVM_DefineClass__";
 910 
 911   assert(THREAD->is_Java_thread(), "must be a JavaThread");
 912   JavaThread* jt = (JavaThread*) THREAD;
 913 
 914   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
 915                              ClassLoader::perf_define_appclass_selftime(),
 916                              ClassLoader::perf_define_appclasses(),
 917                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 918                              jt->get_thread_stat()->perf_timers_addr(),
 919                              PerfClassTraceTime::DEFINE_CLASS);
 920 
 921   if (UsePerfData) {
 922     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
 923   }
 924 
 925   // Since exceptions can be thrown, class initialization can take place
 926   // if name is NULL no check for class name in .class stream has to be made.
 927   TempNewSymbol class_name = NULL;
 928   if (name != NULL) {
 929     const int str_len = (int)strlen(name);
 930     if (str_len > Symbol::max_length()) {
 931       // It's impossible to create this class;  the name cannot fit
 932       // into the constant pool.
 933       Exceptions::fthrow(THREAD_AND_LOCATION,
 934                          vmSymbols::java_lang_NoClassDefFoundError(),
 935                          "Class name exceeds maximum length of %d: %s",
 936                          Symbol::max_length(),
 937                          name);
 938       return 0;
 939     }
 940     class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
 941   }
 942 
 943   ResourceMark rm(THREAD);
 944   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
 945   Handle class_loader (THREAD, JNIHandles::resolve(loader));
 946   if (UsePerfData) {
 947     is_lock_held_by_thread(class_loader,
 948                            ClassLoader::sync_JVMDefineClassLockFreeCounter(),
 949                            THREAD);
 950   }
 951   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
 952   Klass* k = SystemDictionary::resolve_from_stream(class_name,
 953                                                    class_loader,
 954                                                    protection_domain,
 955                                                    &st,
 956                                                    NULL,  // dynamic_nest_host
 957                                                    CHECK_NULL);
 958 
 959   if (log_is_enabled(Debug, class, resolve) && k != NULL) {
 960     trace_class_resolution(k);
 961   }
 962 
 963   return (jclass) JNIHandles::make_local(env, k->java_mirror());
 964 }
 965 
 966 enum {
 967   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
 968   NONFINDABLE_CLASS     = java_lang_invoke_MemberName::MN_NONFINDABLE_CLASS,
 969   WEAK_CLASS            = java_lang_invoke_MemberName::MN_WEAK_CLASS,
 970   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
 971 };
 972 
 973 /*
 974  * Define a class with the specified flags that indicates if it's a nestmate,
 975  * not findable, or weakly reachable from class loader.
 976  *
 977  * Same class may be defined by multiple threads at the same time.
 978  * Should the VM keep the classData (the one successfully defined the class)
 979  * as if a private static field is declared in the class?
 980  */
 981 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name,
 982                                       jobject loader, const jbyte *buf, jsize len, jobject pd,
 983                                       int flags, jobject classData, TRAPS) {
 984   assert(THREAD->is_Java_thread(), "must be a JavaThread");
 985   JavaThread* jt = (JavaThread*) THREAD;
 986   ResourceMark rm(THREAD);
 987 
 988   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
 989   // Lookup class must be a non-null instance
 990   if (k == NULL) {
 991     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
 992   }
 993   assert(k->is_instance_klass(), "Lookup class must be an instance klass");
 994 
 995   jboolean is_nestmate = (flags & NESTMATE) == NESTMATE;
 996   jboolean is_nonfindable = (flags & NONFINDABLE_CLASS) == NONFINDABLE_CLASS;
 997   jboolean is_weak = (flags & WEAK_CLASS) == WEAK_CLASS;
 998   jboolean vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
 999 
1000   InstanceKlass* host_class = NULL;
1001   if (is_nestmate) {
1002     // we need to find the true nest-host of the lookup class,
1003     // so any exceptions in nest validation must be thrown
1004     Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1005     host_class = InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1006   }
1007 
1008   // classData (constant pool patching replacement) is only applicable for nonfindable classes
1009   if (classData != NULL && !is_nonfindable) {
1010     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for nonfindable classes");
1011   }
1012 
1013   // vm_annotations only allowed for nonfindable classes
1014   if (vm_annotations && !is_nonfindable) {
1015     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for weak nonfindable classes");
1016   }
1017 
1018   if (log_is_enabled(Info, class, nestmates)) {
1019     log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1020                                name,
1021                                is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1022                                is_nestmate ? host_class->external_name() : "",
1023                                is_nonfindable ? "non-findable" : "findable",
1024                                is_weak ? "weak" : "strong",
1025                                vm_annotations ? "with vm annotations" : "without vm annotation");
1026   }
1027 
1028   // Since exceptions can be thrown, class initialization can take place
1029   // if name is NULL no check for class name in .class stream has to be made.
1030   TempNewSymbol class_name = NULL;
1031   if (name != NULL) {
1032     const int str_len = (int)strlen(name);
1033     if (str_len > Symbol::max_length()) {
1034       // It's impossible to create this class;  the name cannot fit
1035       // into the constant pool.
1036       Exceptions::fthrow(THREAD_AND_LOCATION,
1037                          vmSymbols::java_lang_NoClassDefFoundError(),
1038                          "Class name exceeds maximum length of %d: %s",
1039                          Symbol::max_length(),
1040                          name);
1041       return 0;
1042     }
1043     class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
1044   }
1045 
1046   Handle class_loader (THREAD, JNIHandles::resolve(loader));
1047   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1048   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1049   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1050 
1051   if (!is_nonfindable) {
1052     k = SystemDictionary::resolve_from_stream(class_name,
1053                                               class_loader,
1054                                               protection_domain,
1055                                               &st,
1056                                               host_class,
1057                                               CHECK_NULL);
1058 
1059     if (log_is_enabled(Debug, class, resolve) && k != NULL) {
1060       trace_class_resolution(k);
1061     }
1062   } else { //nonfindable
1063     Handle classData_h(THREAD, JNIHandles::resolve(classData));
1064     k = SystemDictionary::parse_stream(class_name,
1065                                        class_loader,
1066                                        protection_domain,
1067                                        &st,
1068                                        NULL, // unsafe_anonymous_host
1069                                        NULL, // cp_patches
1070                                        is_nonfindable,
1071                                        is_weak,
1072                                        vm_annotations,
1073                                        host_class,
1074                                        classData_h,
1075                                        CHECK_NULL);
1076     if (k == NULL) {
1077       THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a nonfindable class");
1078     }
1079 
1080     // The nonfindable class loader data has been artificially been kept alive to
1081     // this point. The mirror and any instances of this class have to keep
1082     // it alive afterwards.
1083     InstanceKlass::cast(k)->class_loader_data()->dec_keep_alive();
1084   }
1085 
1086   if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1087     InstanceKlass* ik = InstanceKlass::cast(k);
1088     ModuleEntry* module = ik->module();
1089     const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1090     log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1091                                 module_name,
1092                                 ik->external_name(),
1093                                 host_class->external_name(),
1094                                 ik->is_nonfindable() ? "is non-findable" : "is findable");
1095   }
1096 
1097   return (jclass) JNIHandles::make_local(env, k->java_mirror());
1098 }
1099 
1100 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1101   JVMWrapper("JVM_DefineClass");
1102 
1103   return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
1104 JVM_END
1105 
1106 /*
1107  * Define a class with the specified lookup class.
1108  *  lookup:  Lookup class
1109  *  name:    the name of the class
1110  *  loader:  defining class loader
1111  *  buf:     class bytes
1112  *  len:     length of class bytes
1113  *  pd:      protection domain
1114  *  flags:   properties of the class
1115  *  classData: private static pre-initialized field
1116  */
1117 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, jobject loader,
1118                       const jbyte *buf, jsize len, jobject pd, int flags, jobject classData))
1119   JVMWrapper("JVM_LookupDefineClass");
1120 
1121   if (lookup == NULL) {
1122     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1123   }
1124 
1125   assert(buf != NULL, "buf must not be NULL");
1126 
1127   return jvm_lookup_define_class(env, lookup, name, loader, buf, len, pd, flags, classData, THREAD);
1128 JVM_END
1129 
1130 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1131   JVMWrapper("JVM_DefineClassWithSource");
1132 
1133   return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1134 JVM_END
1135 
1136 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1137   JVMWrapper("JVM_FindLoadedClass");
1138   ResourceMark rm(THREAD);
1139 
1140   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1141   Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
1142 
1143   const char* str   = java_lang_String::as_utf8_string(string());
1144   // Sanity check, don't expect null
1145   if (str == NULL) return NULL;
1146 
1147   const int str_len = (int)strlen(str);
1148   if (str_len > Symbol::max_length()) {
1149     // It's impossible to create this class;  the name cannot fit
1150     // into the constant pool.
1151     return NULL;
1152   }
1153   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1154 
1155   // Security Note:
1156   //   The Java level wrapper will perform the necessary security check allowing
1157   //   us to pass the NULL as the initiating class loader.
1158   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1159   if (UsePerfData) {
1160     is_lock_held_by_thread(h_loader,
1161                            ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1162                            THREAD);
1163   }
1164 
1165   Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1166                                                               h_loader,
1167                                                               Handle(),
1168                                                               CHECK_NULL);
1169 #if INCLUDE_CDS
1170   if (k == NULL) {
1171     // If the class is not already loaded, try to see if it's in the shared
1172     // archive for the current classloader (h_loader).
1173     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1174   }
1175 #endif
1176   return (k == NULL) ? NULL :
1177             (jclass) JNIHandles::make_local(env, k->java_mirror());
1178 JVM_END
1179 
1180 // Module support //////////////////////////////////////////////////////////////////////////////
1181 
1182 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1183                                  jstring location, const char* const* packages, jsize num_packages))
1184   JVMWrapper("JVM_DefineModule");
1185   Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1186 JVM_END
1187 
1188 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1189   JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1190   Modules::set_bootloader_unnamed_module(module, CHECK);
1191 JVM_END
1192 
1193 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1194   JVMWrapper("JVM_AddModuleExports");
1195   Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1196 JVM_END
1197 
1198 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1199   JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1200   Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1201 JVM_END
1202 
1203 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1204   JVMWrapper("JVM_AddModuleExportsToAll");
1205   Modules::add_module_exports(from_module, package, NULL, CHECK);
1206 JVM_END
1207 
1208 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1209   JVMWrapper("JVM_AddReadsModule");
1210   Modules::add_reads_module(from_module, source_module, CHECK);
1211 JVM_END
1212 
1213 // Reflection support //////////////////////////////////////////////////////////////////////////////
1214 
1215 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1216   assert (cls != NULL, "illegal class");
1217   JVMWrapper("JVM_InitClassName");
1218   JvmtiVMObjectAllocEventCollector oam;
1219   ResourceMark rm(THREAD);
1220   HandleMark hm(THREAD);
1221   Handle java_class(THREAD, JNIHandles::resolve(cls));
1222   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1223   return (jstring) JNIHandles::make_local(env, result);
1224 JVM_END
1225 
1226 
1227 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1228   JVMWrapper("JVM_GetClassInterfaces");
1229   JvmtiVMObjectAllocEventCollector oam;
1230   oop mirror = JNIHandles::resolve_non_null(cls);
1231 
1232   // Special handling for primitive objects
1233   if (java_lang_Class::is_primitive(mirror)) {
1234     // Primitive objects does not have any interfaces
1235     objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1236     return (jobjectArray) JNIHandles::make_local(env, r);
1237   }
1238 
1239   Klass* klass = java_lang_Class::as_Klass(mirror);
1240   // Figure size of result array
1241   int size;
1242   if (klass->is_instance_klass()) {
1243     size = InstanceKlass::cast(klass)->local_interfaces()->length();
1244   } else {
1245     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1246     size = 2;
1247   }
1248 
1249   // Allocate result array
1250   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1251   objArrayHandle result (THREAD, r);
1252   // Fill in result
1253   if (klass->is_instance_klass()) {
1254     // Regular instance klass, fill in all local interfaces
1255     for (int index = 0; index < size; index++) {
1256       Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1257       result->obj_at_put(index, k->java_mirror());
1258     }
1259   } else {
1260     // All arrays implement java.lang.Cloneable and java.io.Serializable
1261     result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1262     result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1263   }
1264   return (jobjectArray) JNIHandles::make_local(env, result());
1265 JVM_END
1266 
1267 
1268 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1269   JVMWrapper("JVM_IsInterface");
1270   oop mirror = JNIHandles::resolve_non_null(cls);
1271   if (java_lang_Class::is_primitive(mirror)) {
1272     return JNI_FALSE;
1273   }
1274   Klass* k = java_lang_Class::as_Klass(mirror);
1275   jboolean result = k->is_interface();
1276   assert(!result || k->is_instance_klass(),
1277          "all interfaces are instance types");
1278   // The compiler intrinsic for isInterface tests the
1279   // Klass::_access_flags bits in the same way.
1280   return result;
1281 JVM_END
1282 
1283 
1284 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1285   JVMWrapper("JVM_GetClassSigners");
1286   JvmtiVMObjectAllocEventCollector oam;
1287   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1288     // There are no signers for primitive types
1289     return NULL;
1290   }
1291 
1292   objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1293 
1294   // If there are no signers set in the class, or if the class
1295   // is an array, return NULL.
1296   if (signers == NULL) return NULL;
1297 
1298   // copy of the signers array
1299   Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1300   objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1301   for (int index = 0; index < signers->length(); index++) {
1302     signers_copy->obj_at_put(index, signers->obj_at(index));
1303   }
1304 
1305   // return the copy
1306   return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1307 JVM_END
1308 
1309 
1310 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1311   JVMWrapper("JVM_SetClassSigners");
1312   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1313     // This call is ignored for primitive types and arrays.
1314     // Signers are only set once, ClassLoader.java, and thus shouldn't
1315     // be called with an array.  Only the bootstrap loader creates arrays.
1316     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1317     if (k->is_instance_klass()) {
1318       java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1319     }
1320   }
1321 JVM_END
1322 
1323 
1324 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1325   JVMWrapper("JVM_GetProtectionDomain");
1326   if (JNIHandles::resolve(cls) == NULL) {
1327     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1328   }
1329 
1330   if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1331     // Primitive types does not have a protection domain.
1332     return NULL;
1333   }
1334 
1335   oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1336   return (jobject) JNIHandles::make_local(env, pd);
1337 JVM_END
1338 
1339 
1340 // Returns the inherited_access_control_context field of the running thread.
1341 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1342   JVMWrapper("JVM_GetInheritedAccessControlContext");
1343   oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1344   return JNIHandles::make_local(env, result);
1345 JVM_END
1346 
1347 class RegisterArrayForGC {
1348  private:
1349   JavaThread *_thread;
1350  public:
1351   RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array)  {
1352     _thread = thread;
1353     _thread->register_array_for_gc(array);
1354   }
1355 
1356   ~RegisterArrayForGC() {
1357     _thread->register_array_for_gc(NULL);
1358   }
1359 };
1360 
1361 
1362 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1363   JVMWrapper("JVM_GetStackAccessControlContext");
1364   if (!UsePrivilegedStack) return NULL;
1365 
1366   ResourceMark rm(THREAD);
1367   GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1368   JvmtiVMObjectAllocEventCollector oam;
1369 
1370   // count the protection domains on the execution stack. We collapse
1371   // duplicate consecutive protection domains into a single one, as
1372   // well as stopping when we hit a privileged frame.
1373 
1374   oop previous_protection_domain = NULL;
1375   Handle privileged_context(thread, NULL);
1376   bool is_privileged = false;
1377   oop protection_domain = NULL;
1378 
1379   // Iterate through Java frames
1380   vframeStream vfst(thread);
1381   for(; !vfst.at_end(); vfst.next()) {
1382     // get method of frame
1383     Method* method = vfst.method();
1384 
1385     // stop at the first privileged frame
1386     if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1387       method->name() == vmSymbols::executePrivileged_name())
1388     {
1389       // this frame is privileged
1390       is_privileged = true;
1391 
1392       javaVFrame *priv = vfst.asJavaVFrame();       // executePrivileged
1393 
1394       StackValueCollection* locals = priv->locals();
1395       StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1396       StackValue* clr_sv = locals->at(2); // Class<?> caller
1397       assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1398       assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1399       privileged_context    = ctx_sv->get_obj();
1400       Handle caller         = clr_sv->get_obj();
1401 
1402       Klass *caller_klass = java_lang_Class::as_Klass(caller());
1403       protection_domain  = caller_klass->protection_domain();
1404     } else {
1405       protection_domain = method->method_holder()->protection_domain();
1406     }
1407 
1408     if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1409       local_array->push(protection_domain);
1410       previous_protection_domain = protection_domain;
1411     }
1412 
1413     if (is_privileged) break;
1414   }
1415 
1416 
1417   // either all the domains on the stack were system domains, or
1418   // we had a privileged system domain
1419   if (local_array->is_empty()) {
1420     if (is_privileged && privileged_context.is_null()) return NULL;
1421 
1422     oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1423     return JNIHandles::make_local(env, result);
1424   }
1425 
1426   // the resource area must be registered in case of a gc
1427   RegisterArrayForGC ragc(thread, local_array);
1428   objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1429                                                  local_array->length(), CHECK_NULL);
1430   objArrayHandle h_context(thread, context);
1431   for (int index = 0; index < local_array->length(); index++) {
1432     h_context->obj_at_put(index, local_array->at(index));
1433   }
1434 
1435   oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1436 
1437   return JNIHandles::make_local(env, result);
1438 JVM_END
1439 
1440 
1441 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1442   JVMWrapper("JVM_IsArrayClass");
1443   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1444   return (k != NULL) && k->is_array_klass() ? true : false;
1445 JVM_END
1446 
1447 
1448 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1449   JVMWrapper("JVM_IsPrimitiveClass");
1450   oop mirror = JNIHandles::resolve_non_null(cls);
1451   return (jboolean) java_lang_Class::is_primitive(mirror);
1452 JVM_END
1453 
1454 
1455 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1456   JVMWrapper("JVM_GetClassModifiers");
1457   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1458     // Primitive type
1459     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1460   }
1461 
1462   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1463   debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1464   assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1465   return k->modifier_flags();
1466 JVM_END
1467 
1468 
1469 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1470 
1471 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1472   JvmtiVMObjectAllocEventCollector oam;
1473   // ofClass is a reference to a java_lang_Class object. The mirror object
1474   // of an InstanceKlass
1475 
1476   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1477       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1478     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1479     return (jobjectArray)JNIHandles::make_local(env, result);
1480   }
1481 
1482   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1483   InnerClassesIterator iter(k);
1484 
1485   if (iter.length() == 0) {
1486     // Neither an inner nor outer class
1487     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1488     return (jobjectArray)JNIHandles::make_local(env, result);
1489   }
1490 
1491   // find inner class info
1492   constantPoolHandle cp(thread, k->constants());
1493   int length = iter.length();
1494 
1495   // Allocate temp. result array
1496   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1497   objArrayHandle result (THREAD, r);
1498   int members = 0;
1499 
1500   for (; !iter.done(); iter.next()) {
1501     int ioff = iter.inner_class_info_index();
1502     int ooff = iter.outer_class_info_index();
1503 
1504     if (ioff != 0 && ooff != 0) {
1505       // Check to see if the name matches the class we're looking for
1506       // before attempting to find the class.
1507       if (cp->klass_name_at_matches(k, ooff)) {
1508         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1509         if (outer_klass == k) {
1510            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1511            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1512 
1513            // Throws an exception if outer klass has not declared k as
1514            // an inner klass
1515            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1516 
1517            result->obj_at_put(members, inner_klass->java_mirror());
1518            members++;
1519         }
1520       }
1521     }
1522   }
1523 
1524   if (members != length) {
1525     // Return array of right length
1526     objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1527     for(int i = 0; i < members; i++) {
1528       res->obj_at_put(i, result->obj_at(i));
1529     }
1530     return (jobjectArray)JNIHandles::make_local(env, res);
1531   }
1532 
1533   return (jobjectArray)JNIHandles::make_local(env, result());
1534 JVM_END
1535 
1536 
1537 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1538 {
1539   // ofClass is a reference to a java_lang_Class object.
1540   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1541       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1542     return NULL;
1543   }
1544 
1545   bool inner_is_member = false;
1546   Klass* outer_klass
1547     = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1548                           )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1549   if (outer_klass == NULL)  return NULL;  // already a top-level class
1550   if (!inner_is_member)  return NULL;     // a nonfindable or unsafe anonymous class (inside a method)
1551   return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1552 }
1553 JVM_END
1554 
1555 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1556 {
1557   oop mirror = JNIHandles::resolve_non_null(cls);
1558   if (java_lang_Class::is_primitive(mirror) ||
1559       !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1560     return NULL;
1561   }
1562   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1563   int ooff = 0, noff = 0;
1564   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1565     if (noff != 0) {
1566       constantPoolHandle i_cp(thread, k->constants());
1567       Symbol* name = i_cp->symbol_at(noff);
1568       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1569       return (jstring) JNIHandles::make_local(env, str());
1570     }
1571   }
1572   return NULL;
1573 }
1574 JVM_END
1575 
1576 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1577   assert (cls != NULL, "illegal class");
1578   JVMWrapper("JVM_GetClassSignature");
1579   JvmtiVMObjectAllocEventCollector oam;
1580   ResourceMark rm(THREAD);
1581   // Return null for arrays and primatives
1582   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1583     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1584     if (k->is_instance_klass()) {
1585       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1586       if (sym == NULL) return NULL;
1587       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1588       return (jstring) JNIHandles::make_local(env, str());
1589     }
1590   }
1591   return NULL;
1592 JVM_END
1593 
1594 
1595 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1596   assert (cls != NULL, "illegal class");
1597   JVMWrapper("JVM_GetClassAnnotations");
1598 
1599   // Return null for arrays and primitives
1600   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1601     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1602     if (k->is_instance_klass()) {
1603       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1604       return (jbyteArray) JNIHandles::make_local(env, a);
1605     }
1606   }
1607   return NULL;
1608 JVM_END
1609 
1610 
1611 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1612   // some of this code was adapted from from jni_FromReflectedField
1613 
1614   oop reflected = JNIHandles::resolve_non_null(field);
1615   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1616   Klass* k    = java_lang_Class::as_Klass(mirror);
1617   int slot      = java_lang_reflect_Field::slot(reflected);
1618   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1619 
1620   InstanceKlass* ik = InstanceKlass::cast(k);
1621   intptr_t offset = ik->field_offset(slot);
1622 
1623   if (modifiers & JVM_ACC_STATIC) {
1624     // for static fields we only look in the current class
1625     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1626       assert(false, "cannot find static field");
1627       return false;
1628     }
1629   } else {
1630     // for instance fields we start with the current class and work
1631     // our way up through the superclass chain
1632     if (!ik->find_field_from_offset(offset, false, &fd)) {
1633       assert(false, "cannot find instance field");
1634       return false;
1635     }
1636   }
1637   return true;
1638 }
1639 
1640 static Method* jvm_get_method_common(jobject method) {
1641   // some of this code was adapted from from jni_FromReflectedMethod
1642 
1643   oop reflected = JNIHandles::resolve_non_null(method);
1644   oop mirror    = NULL;
1645   int slot      = 0;
1646 
1647   if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1648     mirror = java_lang_reflect_Constructor::clazz(reflected);
1649     slot   = java_lang_reflect_Constructor::slot(reflected);
1650   } else {
1651     assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1652            "wrong type");
1653     mirror = java_lang_reflect_Method::clazz(reflected);
1654     slot   = java_lang_reflect_Method::slot(reflected);
1655   }
1656   Klass* k = java_lang_Class::as_Klass(mirror);
1657 
1658   Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1659   assert(m != NULL, "cannot find method");
1660   return m;  // caller has to deal with NULL in product mode
1661 }
1662 
1663 /* Type use annotations support (JDK 1.8) */
1664 
1665 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1666   assert (cls != NULL, "illegal class");
1667   JVMWrapper("JVM_GetClassTypeAnnotations");
1668   ResourceMark rm(THREAD);
1669   // Return null for arrays and primitives
1670   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1671     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1672     if (k->is_instance_klass()) {
1673       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1674       if (type_annotations != NULL) {
1675         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1676         return (jbyteArray) JNIHandles::make_local(env, a);
1677       }
1678     }
1679   }
1680   return NULL;
1681 JVM_END
1682 
1683 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1684   assert (method != NULL, "illegal method");
1685   JVMWrapper("JVM_GetMethodTypeAnnotations");
1686 
1687   // method is a handle to a java.lang.reflect.Method object
1688   Method* m = jvm_get_method_common(method);
1689   if (m == NULL) {
1690     return NULL;
1691   }
1692 
1693   AnnotationArray* type_annotations = m->type_annotations();
1694   if (type_annotations != NULL) {
1695     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1696     return (jbyteArray) JNIHandles::make_local(env, a);
1697   }
1698 
1699   return NULL;
1700 JVM_END
1701 
1702 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1703   assert (field != NULL, "illegal field");
1704   JVMWrapper("JVM_GetFieldTypeAnnotations");
1705 
1706   fieldDescriptor fd;
1707   bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1708   if (!gotFd) {
1709     return NULL;
1710   }
1711 
1712   return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1713 JVM_END
1714 
1715 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1716   if (!cp->is_within_bounds(index)) {
1717     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1718   }
1719 }
1720 
1721 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1722 {
1723   JVMWrapper("JVM_GetMethodParameters");
1724   // method is a handle to a java.lang.reflect.Method object
1725   Method* method_ptr = jvm_get_method_common(method);
1726   methodHandle mh (THREAD, method_ptr);
1727   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1728   const int num_params = mh->method_parameters_length();
1729 
1730   if (num_params < 0) {
1731     // A -1 return value from method_parameters_length means there is no
1732     // parameter data.  Return null to indicate this to the reflection
1733     // API.
1734     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1735     return (jobjectArray)NULL;
1736   } else {
1737     // Otherwise, we return something up to reflection, even if it is
1738     // a zero-length array.  Why?  Because in some cases this can
1739     // trigger a MalformedParametersException.
1740 
1741     // make sure all the symbols are properly formatted
1742     for (int i = 0; i < num_params; i++) {
1743       MethodParametersElement* params = mh->method_parameters_start();
1744       int index = params[i].name_cp_index;
1745       bounds_check(mh->constants(), index, CHECK_NULL);
1746 
1747       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1748         THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1749                     "Wrong type at constant pool index");
1750       }
1751 
1752     }
1753 
1754     objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1755     objArrayHandle result (THREAD, result_oop);
1756 
1757     for (int i = 0; i < num_params; i++) {
1758       MethodParametersElement* params = mh->method_parameters_start();
1759       // For a 0 index, give a NULL symbol
1760       Symbol* sym = 0 != params[i].name_cp_index ?
1761         mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1762       int flags = params[i].flags;
1763       oop param = Reflection::new_parameter(reflected_method, i, sym,
1764                                             flags, CHECK_NULL);
1765       result->obj_at_put(i, param);
1766     }
1767     return (jobjectArray)JNIHandles::make_local(env, result());
1768   }
1769 }
1770 JVM_END
1771 
1772 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1773 
1774 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1775 {
1776   JVMWrapper("JVM_GetClassDeclaredFields");
1777   JvmtiVMObjectAllocEventCollector oam;
1778 
1779   // Exclude primitive types and array types
1780   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1781       java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1782     // Return empty array
1783     oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1784     return (jobjectArray) JNIHandles::make_local(env, res);
1785   }
1786 
1787   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1788   constantPoolHandle cp(THREAD, k->constants());
1789 
1790   // Ensure class is linked
1791   k->link_class(CHECK_NULL);
1792 
1793   // Allocate result
1794   int num_fields;
1795 
1796   if (publicOnly) {
1797     num_fields = 0;
1798     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1799       if (fs.access_flags().is_public()) ++num_fields;
1800     }
1801   } else {
1802     num_fields = k->java_fields_count();
1803   }
1804 
1805   objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1806   objArrayHandle result (THREAD, r);
1807 
1808   int out_idx = 0;
1809   fieldDescriptor fd;
1810   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1811     if (!publicOnly || fs.access_flags().is_public()) {
1812       fd.reinitialize(k, fs.index());
1813       oop field = Reflection::new_field(&fd, CHECK_NULL);
1814       result->obj_at_put(out_idx, field);
1815       ++out_idx;
1816     }
1817   }
1818   assert(out_idx == num_fields, "just checking");
1819   return (jobjectArray) JNIHandles::make_local(env, result());
1820 }
1821 JVM_END
1822 
1823 static bool select_method(const methodHandle& method, bool want_constructor) {
1824   if (want_constructor) {
1825     return (method->is_initializer() && !method->is_static());
1826   } else {
1827     return  (!method->is_initializer() && !method->is_overpass());
1828   }
1829 }
1830 
1831 static jobjectArray get_class_declared_methods_helper(
1832                                   JNIEnv *env,
1833                                   jclass ofClass, jboolean publicOnly,
1834                                   bool want_constructor,
1835                                   Klass* klass, TRAPS) {
1836 
1837   JvmtiVMObjectAllocEventCollector oam;
1838 
1839   // Exclude primitive types and array types
1840   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1841       || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1842     // Return empty array
1843     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1844     return (jobjectArray) JNIHandles::make_local(env, res);
1845   }
1846 
1847   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1848 
1849   // Ensure class is linked
1850   k->link_class(CHECK_NULL);
1851 
1852   Array<Method*>* methods = k->methods();
1853   int methods_length = methods->length();
1854 
1855   // Save original method_idnum in case of redefinition, which can change
1856   // the idnum of obsolete methods.  The new method will have the same idnum
1857   // but if we refresh the methods array, the counts will be wrong.
1858   ResourceMark rm(THREAD);
1859   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1860   int num_methods = 0;
1861 
1862   for (int i = 0; i < methods_length; i++) {
1863     methodHandle method(THREAD, methods->at(i));
1864     if (select_method(method, want_constructor)) {
1865       if (!publicOnly || method->is_public()) {
1866         idnums->push(method->method_idnum());
1867         ++num_methods;
1868       }
1869     }
1870   }
1871 
1872   // Allocate result
1873   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1874   objArrayHandle result (THREAD, r);
1875 
1876   // Now just put the methods that we selected above, but go by their idnum
1877   // in case of redefinition.  The methods can be redefined at any safepoint,
1878   // so above when allocating the oop array and below when creating reflect
1879   // objects.
1880   for (int i = 0; i < num_methods; i++) {
1881     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1882     if (method.is_null()) {
1883       // Method may have been deleted and seems this API can handle null
1884       // Otherwise should probably put a method that throws NSME
1885       result->obj_at_put(i, NULL);
1886     } else {
1887       oop m;
1888       if (want_constructor) {
1889         m = Reflection::new_constructor(method, CHECK_NULL);
1890       } else {
1891         m = Reflection::new_method(method, false, CHECK_NULL);
1892       }
1893       result->obj_at_put(i, m);
1894     }
1895   }
1896 
1897   return (jobjectArray) JNIHandles::make_local(env, result());
1898 }
1899 
1900 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1901 {
1902   JVMWrapper("JVM_GetClassDeclaredMethods");
1903   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1904                                            /*want_constructor*/ false,
1905                                            SystemDictionary::reflect_Method_klass(), THREAD);
1906 }
1907 JVM_END
1908 
1909 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1910 {
1911   JVMWrapper("JVM_GetClassDeclaredConstructors");
1912   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1913                                            /*want_constructor*/ true,
1914                                            SystemDictionary::reflect_Constructor_klass(), THREAD);
1915 }
1916 JVM_END
1917 
1918 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1919 {
1920   JVMWrapper("JVM_GetClassAccessFlags");
1921   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1922     // Primitive type
1923     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1924   }
1925 
1926   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1927   return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1928 }
1929 JVM_END
1930 
1931 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1932 {
1933   JVMWrapper("JVM_AreNestMates");
1934   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1935   assert(c->is_instance_klass(), "must be");
1936   InstanceKlass* ck = InstanceKlass::cast(c);
1937   Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1938   assert(m->is_instance_klass(), "must be");
1939   InstanceKlass* mk = InstanceKlass::cast(m);
1940   return ck->has_nestmate_access_to(mk, THREAD);
1941 }
1942 JVM_END
1943 
1944 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1945 {
1946   // current is not a primitive or array class
1947   JVMWrapper("JVM_GetNestHost");
1948   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1949   assert(c->is_instance_klass(), "must be");
1950   InstanceKlass* ck = InstanceKlass::cast(c);
1951   // Don't post exceptions if validation fails
1952   InstanceKlass* host = ck->nest_host(NULL, THREAD);
1953   return (jclass) (host == NULL ? NULL :
1954                    JNIHandles::make_local(THREAD, host->java_mirror()));
1955 }
1956 JVM_END
1957 
1958 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1959 {
1960   // current is not a primitive or array class
1961   JVMWrapper("JVM_GetNestMembers");
1962   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1963   assert(c->is_instance_klass(), "must be");
1964   InstanceKlass* ck = InstanceKlass::cast(c);
1965   // Get the nest host for this nest - throw ICCE if validation fails
1966   Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1967   InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1968 
1969   {
1970     JvmtiVMObjectAllocEventCollector oam;
1971     Array<u2>* members = host->nest_members();
1972     int length = members == NULL ? 0 : members->length();
1973     // nest host is first in the array so make it one bigger
1974     objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1975                                              length + 1, CHECK_NULL);
1976     objArrayHandle result (THREAD, r);
1977     result->obj_at_put(0, host->java_mirror());
1978     if (length != 0) {
1979       int i;
1980       for (i = 0; i < length; i++) {
1981          int cp_index = members->at(i);
1982          Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1983          if (k->is_instance_klass()) {
1984            InstanceKlass* nest_host_k =
1985              InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1986            if (nest_host_k == host) {
1987              result->obj_at_put(i+1, k->java_mirror());
1988            }
1989            else {
1990              // k's nest host is legal but it isn't our host so
1991              // throw ICCE
1992              ResourceMark rm(THREAD);
1993              Exceptions::fthrow(THREAD_AND_LOCATION,
1994                                 icce,
1995                                 "%s.getNestMembers: Nest member %s in %s declares a different nest host of %s",
1996                                 c->external_name(),
1997                                 k->external_name(),
1998                                 host->external_name(),
1999                                 nest_host_k->external_name()
2000                            );
2001              return NULL;
2002            }
2003          }
2004          else {
2005            // we have a bad nest member entry - throw ICCE
2006            ResourceMark rm(THREAD);
2007            Exceptions::fthrow(THREAD_AND_LOCATION,
2008                               icce,
2009                               "Class %s can not be a nest member of %s",
2010                               k->external_name(),
2011                               host->external_name()
2012                               );
2013            return NULL;
2014          }
2015       }
2016     }
2017     else {
2018       assert(host == ck, "must be singleton nest");
2019     }
2020     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2021   }
2022 }
2023 JVM_END
2024 
2025 // Constant pool access //////////////////////////////////////////////////////////
2026 
2027 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2028 {
2029   JVMWrapper("JVM_GetClassConstantPool");
2030   JvmtiVMObjectAllocEventCollector oam;
2031 
2032   // Return null for primitives and arrays
2033   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2034     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2035     if (k->is_instance_klass()) {
2036       InstanceKlass* k_h = InstanceKlass::cast(k);
2037       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2038       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2039       return JNIHandles::make_local(jcp());
2040     }
2041   }
2042   return NULL;
2043 }
2044 JVM_END
2045 
2046 
2047 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2048 {
2049   JVMWrapper("JVM_ConstantPoolGetSize");
2050   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2051   return cp->length();
2052 }
2053 JVM_END
2054 
2055 
2056 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2057 {
2058   JVMWrapper("JVM_ConstantPoolGetClassAt");
2059   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2060   bounds_check(cp, index, CHECK_NULL);
2061   constantTag tag = cp->tag_at(index);
2062   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2063     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2064   }
2065   Klass* k = cp->klass_at(index, CHECK_NULL);
2066   return (jclass) JNIHandles::make_local(k->java_mirror());
2067 }
2068 JVM_END
2069 
2070 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2071 {
2072   JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2073   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2074   bounds_check(cp, index, CHECK_NULL);
2075   constantTag tag = cp->tag_at(index);
2076   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2077     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2078   }
2079   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2080   if (k == NULL) return NULL;
2081   return (jclass) JNIHandles::make_local(k->java_mirror());
2082 }
2083 JVM_END
2084 
2085 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2086   constantTag tag = cp->tag_at(index);
2087   if (!tag.is_method() && !tag.is_interface_method()) {
2088     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2089   }
2090   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2091   Klass* k_o;
2092   if (force_resolution) {
2093     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2094   } else {
2095     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2096     if (k_o == NULL) return NULL;
2097   }
2098   InstanceKlass* k = InstanceKlass::cast(k_o);
2099   Symbol* name = cp->uncached_name_ref_at(index);
2100   Symbol* sig  = cp->uncached_signature_ref_at(index);
2101   methodHandle m (THREAD, k->find_method(name, sig));
2102   if (m.is_null()) {
2103     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2104   }
2105   oop method;
2106   if (!m->is_initializer() || m->is_static()) {
2107     method = Reflection::new_method(m, true, CHECK_NULL);
2108   } else {
2109     method = Reflection::new_constructor(m, CHECK_NULL);
2110   }
2111   return JNIHandles::make_local(method);
2112 }
2113 
2114 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2115 {
2116   JVMWrapper("JVM_ConstantPoolGetMethodAt");
2117   JvmtiVMObjectAllocEventCollector oam;
2118   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2119   bounds_check(cp, index, CHECK_NULL);
2120   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2121   return res;
2122 }
2123 JVM_END
2124 
2125 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2126 {
2127   JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2128   JvmtiVMObjectAllocEventCollector oam;
2129   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2130   bounds_check(cp, index, CHECK_NULL);
2131   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2132   return res;
2133 }
2134 JVM_END
2135 
2136 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2137   constantTag tag = cp->tag_at(index);
2138   if (!tag.is_field()) {
2139     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2140   }
2141   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2142   Klass* k_o;
2143   if (force_resolution) {
2144     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2145   } else {
2146     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2147     if (k_o == NULL) return NULL;
2148   }
2149   InstanceKlass* k = InstanceKlass::cast(k_o);
2150   Symbol* name = cp->uncached_name_ref_at(index);
2151   Symbol* sig  = cp->uncached_signature_ref_at(index);
2152   fieldDescriptor fd;
2153   Klass* target_klass = k->find_field(name, sig, &fd);
2154   if (target_klass == NULL) {
2155     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2156   }
2157   oop field = Reflection::new_field(&fd, CHECK_NULL);
2158   return JNIHandles::make_local(field);
2159 }
2160 
2161 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2162 {
2163   JVMWrapper("JVM_ConstantPoolGetFieldAt");
2164   JvmtiVMObjectAllocEventCollector oam;
2165   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2166   bounds_check(cp, index, CHECK_NULL);
2167   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2168   return res;
2169 }
2170 JVM_END
2171 
2172 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2173 {
2174   JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2175   JvmtiVMObjectAllocEventCollector oam;
2176   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2177   bounds_check(cp, index, CHECK_NULL);
2178   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2179   return res;
2180 }
2181 JVM_END
2182 
2183 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2184 {
2185   JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2186   JvmtiVMObjectAllocEventCollector oam;
2187   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2188   bounds_check(cp, index, CHECK_NULL);
2189   constantTag tag = cp->tag_at(index);
2190   if (!tag.is_field_or_method()) {
2191     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2192   }
2193   int klass_ref = cp->uncached_klass_ref_index_at(index);
2194   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2195   Symbol*  member_name = cp->uncached_name_ref_at(index);
2196   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2197   objArrayOop  dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2198   objArrayHandle dest(THREAD, dest_o);
2199   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2200   dest->obj_at_put(0, str());
2201   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2202   dest->obj_at_put(1, str());
2203   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2204   dest->obj_at_put(2, str());
2205   return (jobjectArray) JNIHandles::make_local(dest());
2206 }
2207 JVM_END
2208 
2209 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2210 {
2211   JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2212   JvmtiVMObjectAllocEventCollector oam;
2213   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2214   bounds_check(cp, index, CHECK_0);
2215   constantTag tag = cp->tag_at(index);
2216   if (!tag.is_field_or_method()) {
2217     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2218   }
2219   return (jint) cp->uncached_klass_ref_index_at(index);
2220 }
2221 JVM_END
2222 
2223 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2224 {
2225   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2226   JvmtiVMObjectAllocEventCollector oam;
2227   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2228   bounds_check(cp, index, CHECK_0);
2229   constantTag tag = cp->tag_at(index);
2230   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2231     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2232   }
2233   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2234 }
2235 JVM_END
2236 
2237 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2238 {
2239   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2240   JvmtiVMObjectAllocEventCollector oam;
2241   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2242   bounds_check(cp, index, CHECK_NULL);
2243   constantTag tag = cp->tag_at(index);
2244   if (!tag.is_name_and_type()) {
2245     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2246   }
2247   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2248   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2249   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2250   objArrayHandle dest(THREAD, dest_o);
2251   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2252   dest->obj_at_put(0, str());
2253   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2254   dest->obj_at_put(1, str());
2255   return (jobjectArray) JNIHandles::make_local(dest());
2256 }
2257 JVM_END
2258 
2259 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2260 {
2261   JVMWrapper("JVM_ConstantPoolGetIntAt");
2262   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2263   bounds_check(cp, index, CHECK_0);
2264   constantTag tag = cp->tag_at(index);
2265   if (!tag.is_int()) {
2266     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2267   }
2268   return cp->int_at(index);
2269 }
2270 JVM_END
2271 
2272 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2273 {
2274   JVMWrapper("JVM_ConstantPoolGetLongAt");
2275   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2276   bounds_check(cp, index, CHECK_(0L));
2277   constantTag tag = cp->tag_at(index);
2278   if (!tag.is_long()) {
2279     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2280   }
2281   return cp->long_at(index);
2282 }
2283 JVM_END
2284 
2285 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2286 {
2287   JVMWrapper("JVM_ConstantPoolGetFloatAt");
2288   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2289   bounds_check(cp, index, CHECK_(0.0f));
2290   constantTag tag = cp->tag_at(index);
2291   if (!tag.is_float()) {
2292     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2293   }
2294   return cp->float_at(index);
2295 }
2296 JVM_END
2297 
2298 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2299 {
2300   JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2301   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2302   bounds_check(cp, index, CHECK_(0.0));
2303   constantTag tag = cp->tag_at(index);
2304   if (!tag.is_double()) {
2305     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2306   }
2307   return cp->double_at(index);
2308 }
2309 JVM_END
2310 
2311 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2312 {
2313   JVMWrapper("JVM_ConstantPoolGetStringAt");
2314   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2315   bounds_check(cp, index, CHECK_NULL);
2316   constantTag tag = cp->tag_at(index);
2317   if (!tag.is_string()) {
2318     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2319   }
2320   oop str = cp->string_at(index, CHECK_NULL);
2321   return (jstring) JNIHandles::make_local(str);
2322 }
2323 JVM_END
2324 
2325 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2326 {
2327   JVMWrapper("JVM_ConstantPoolGetUTF8At");
2328   JvmtiVMObjectAllocEventCollector oam;
2329   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2330   bounds_check(cp, index, CHECK_NULL);
2331   constantTag tag = cp->tag_at(index);
2332   if (!tag.is_symbol()) {
2333     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2334   }
2335   Symbol* sym = cp->symbol_at(index);
2336   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2337   return (jstring) JNIHandles::make_local(str());
2338 }
2339 JVM_END
2340 
2341 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2342 {
2343   JVMWrapper("JVM_ConstantPoolGetTagAt");
2344   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2345   bounds_check(cp, index, CHECK_0);
2346   constantTag tag = cp->tag_at(index);
2347   jbyte result = tag.value();
2348   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2349   // they are changed to the corresponding tags from the JVM spec, so that java code in
2350   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2351   if (tag.is_klass_or_reference()) {
2352       result = JVM_CONSTANT_Class;
2353   } else if (tag.is_string_index()) {
2354       result = JVM_CONSTANT_String;
2355   } else if (tag.is_method_type_in_error()) {
2356       result = JVM_CONSTANT_MethodType;
2357   } else if (tag.is_method_handle_in_error()) {
2358       result = JVM_CONSTANT_MethodHandle;
2359   } else if (tag.is_dynamic_constant_in_error()) {
2360       result = JVM_CONSTANT_Dynamic;
2361   }
2362   return result;
2363 }
2364 JVM_END
2365 
2366 // Assertion support. //////////////////////////////////////////////////////////
2367 
2368 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2369   JVMWrapper("JVM_DesiredAssertionStatus");
2370   assert(cls != NULL, "bad class");
2371 
2372   oop r = JNIHandles::resolve(cls);
2373   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2374   if (java_lang_Class::is_primitive(r)) return false;
2375 
2376   Klass* k = java_lang_Class::as_Klass(r);
2377   assert(k->is_instance_klass(), "must be an instance klass");
2378   if (!k->is_instance_klass()) return false;
2379 
2380   ResourceMark rm(THREAD);
2381   const char* name = k->name()->as_C_string();
2382   bool system_class = k->class_loader() == NULL;
2383   return JavaAssertions::enabled(name, system_class);
2384 
2385 JVM_END
2386 
2387 
2388 // Return a new AssertionStatusDirectives object with the fields filled in with
2389 // command-line assertion arguments (i.e., -ea, -da).
2390 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2391   JVMWrapper("JVM_AssertionStatusDirectives");
2392   JvmtiVMObjectAllocEventCollector oam;
2393   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2394   return JNIHandles::make_local(env, asd);
2395 JVM_END
2396 
2397 // Verification ////////////////////////////////////////////////////////////////////////////////
2398 
2399 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2400 
2401 // RedefineClasses support: bug 6214132 caused verification to fail.
2402 // All functions from this section should call the jvmtiThreadSate function:
2403 //   Klass* class_to_verify_considering_redefinition(Klass* klass).
2404 // The function returns a Klass* of the _scratch_class if the verifier
2405 // was invoked in the middle of the class redefinition.
2406 // Otherwise it returns its argument value which is the _the_class Klass*.
2407 // Please, refer to the description in the jvmtiThreadSate.hpp.
2408 
2409 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2410   JVMWrapper("JVM_GetClassNameUTF");
2411   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2412   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2413   return k->name()->as_utf8();
2414 JVM_END
2415 
2416 
2417 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2418   JVMWrapper("JVM_GetClassCPTypes");
2419   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2420   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2421   // types will have length zero if this is not an InstanceKlass
2422   // (length is determined by call to JVM_GetClassCPEntriesCount)
2423   if (k->is_instance_klass()) {
2424     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2425     for (int index = cp->length() - 1; index >= 0; index--) {
2426       constantTag tag = cp->tag_at(index);
2427       types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2428     }
2429   }
2430 JVM_END
2431 
2432 
2433 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2434   JVMWrapper("JVM_GetClassCPEntriesCount");
2435   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2436   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2437   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2438 JVM_END
2439 
2440 
2441 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2442   JVMWrapper("JVM_GetClassFieldsCount");
2443   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2444   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2445   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2446 JVM_END
2447 
2448 
2449 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2450   JVMWrapper("JVM_GetClassMethodsCount");
2451   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2452   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2453   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2454 JVM_END
2455 
2456 
2457 // The following methods, used for the verifier, are never called with
2458 // array klasses, so a direct cast to InstanceKlass is safe.
2459 // Typically, these methods are called in a loop with bounds determined
2460 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2461 // zero for arrays.
2462 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2463   JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2464   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2465   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2466   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2467   int length = method->checked_exceptions_length();
2468   if (length > 0) {
2469     CheckedExceptionElement* table= method->checked_exceptions_start();
2470     for (int i = 0; i < length; i++) {
2471       exceptions[i] = table[i].class_cp_index;
2472     }
2473   }
2474 JVM_END
2475 
2476 
2477 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2478   JVMWrapper("JVM_GetMethodIxExceptionsCount");
2479   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2480   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2481   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2482   return method->checked_exceptions_length();
2483 JVM_END
2484 
2485 
2486 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2487   JVMWrapper("JVM_GetMethodIxByteCode");
2488   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2489   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2490   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2491   memcpy(code, method->code_base(), method->code_size());
2492 JVM_END
2493 
2494 
2495 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2496   JVMWrapper("JVM_GetMethodIxByteCodeLength");
2497   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2498   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2499   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2500   return method->code_size();
2501 JVM_END
2502 
2503 
2504 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2505   JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2506   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2507   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2508   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2509   ExceptionTable extable(method);
2510   entry->start_pc   = extable.start_pc(entry_index);
2511   entry->end_pc     = extable.end_pc(entry_index);
2512   entry->handler_pc = extable.handler_pc(entry_index);
2513   entry->catchType  = extable.catch_type_index(entry_index);
2514 JVM_END
2515 
2516 
2517 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2518   JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2519   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2520   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2521   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2522   return method->exception_table_length();
2523 JVM_END
2524 
2525 
2526 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2527   JVMWrapper("JVM_GetMethodIxModifiers");
2528   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2530   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2531   return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2532 JVM_END
2533 
2534 
2535 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2536   JVMWrapper("JVM_GetFieldIxModifiers");
2537   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2538   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2539   return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2540 JVM_END
2541 
2542 
2543 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2544   JVMWrapper("JVM_GetMethodIxLocalsCount");
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   return method->max_locals();
2549 JVM_END
2550 
2551 
2552 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2553   JVMWrapper("JVM_GetMethodIxArgsSize");
2554   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2555   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2556   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2557   return method->size_of_parameters();
2558 JVM_END
2559 
2560 
2561 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2562   JVMWrapper("JVM_GetMethodIxMaxStack");
2563   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2564   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2565   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2566   return method->verifier_max_stack();
2567 JVM_END
2568 
2569 
2570 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2571   JVMWrapper("JVM_IsConstructorIx");
2572   ResourceMark rm(THREAD);
2573   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2574   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2575   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2576   return method->name() == vmSymbols::object_initializer_name();
2577 JVM_END
2578 
2579 
2580 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2581   JVMWrapper("JVM_IsVMGeneratedMethodIx");
2582   ResourceMark rm(THREAD);
2583   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2584   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2585   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2586   return method->is_overpass();
2587 JVM_END
2588 
2589 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2590   JVMWrapper("JVM_GetMethodIxIxUTF");
2591   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2592   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2593   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2594   return method->name()->as_utf8();
2595 JVM_END
2596 
2597 
2598 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2599   JVMWrapper("JVM_GetMethodIxSignatureUTF");
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->signature()->as_utf8();
2604 JVM_END
2605 
2606 /**
2607  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2608  * read entries in the constant pool.  Since the old verifier always
2609  * works on a copy of the code, it will not see any rewriting that
2610  * may possibly occur in the middle of verification.  So it is important
2611  * that nothing it calls tries to use the cpCache instead of the raw
2612  * constant pool, so we must use cp->uncached_x methods when appropriate.
2613  */
2614 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2615   JVMWrapper("JVM_GetCPFieldNameUTF");
2616   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2617   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2618   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2619   switch (cp->tag_at(cp_index).value()) {
2620     case JVM_CONSTANT_Fieldref:
2621       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2622     default:
2623       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2624   }
2625   ShouldNotReachHere();
2626   return NULL;
2627 JVM_END
2628 
2629 
2630 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2631   JVMWrapper("JVM_GetCPMethodNameUTF");
2632   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2633   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2634   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2635   switch (cp->tag_at(cp_index).value()) {
2636     case JVM_CONSTANT_InterfaceMethodref:
2637     case JVM_CONSTANT_Methodref:
2638       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2639     default:
2640       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2641   }
2642   ShouldNotReachHere();
2643   return NULL;
2644 JVM_END
2645 
2646 
2647 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2648   JVMWrapper("JVM_GetCPMethodSignatureUTF");
2649   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2650   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2651   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2652   switch (cp->tag_at(cp_index).value()) {
2653     case JVM_CONSTANT_InterfaceMethodref:
2654     case JVM_CONSTANT_Methodref:
2655       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2656     default:
2657       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2658   }
2659   ShouldNotReachHere();
2660   return NULL;
2661 JVM_END
2662 
2663 
2664 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2665   JVMWrapper("JVM_GetCPFieldSignatureUTF");
2666   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2667   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2668   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2669   switch (cp->tag_at(cp_index).value()) {
2670     case JVM_CONSTANT_Fieldref:
2671       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2672     default:
2673       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2674   }
2675   ShouldNotReachHere();
2676   return NULL;
2677 JVM_END
2678 
2679 
2680 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2681   JVMWrapper("JVM_GetCPClassNameUTF");
2682   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2683   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2684   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2685   Symbol* classname = cp->klass_name_at(cp_index);
2686   return classname->as_utf8();
2687 JVM_END
2688 
2689 
2690 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2691   JVMWrapper("JVM_GetCPFieldClassNameUTF");
2692   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2693   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2694   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2695   switch (cp->tag_at(cp_index).value()) {
2696     case JVM_CONSTANT_Fieldref: {
2697       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2698       Symbol* classname = cp->klass_name_at(class_index);
2699       return classname->as_utf8();
2700     }
2701     default:
2702       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2703   }
2704   ShouldNotReachHere();
2705   return NULL;
2706 JVM_END
2707 
2708 
2709 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2710   JVMWrapper("JVM_GetCPMethodClassNameUTF");
2711   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2712   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2713   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2714   switch (cp->tag_at(cp_index).value()) {
2715     case JVM_CONSTANT_Methodref:
2716     case JVM_CONSTANT_InterfaceMethodref: {
2717       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2718       Symbol* classname = cp->klass_name_at(class_index);
2719       return classname->as_utf8();
2720     }
2721     default:
2722       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2723   }
2724   ShouldNotReachHere();
2725   return NULL;
2726 JVM_END
2727 
2728 
2729 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2730   JVMWrapper("JVM_GetCPFieldModifiers");
2731   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2732   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2733   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2734   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2735   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2736   ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2737   switch (cp->tag_at(cp_index).value()) {
2738     case JVM_CONSTANT_Fieldref: {
2739       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2740       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2741       InstanceKlass* ik = InstanceKlass::cast(k_called);
2742       for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2743         if (fs.name() == name && fs.signature() == signature) {
2744           return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2745         }
2746       }
2747       return -1;
2748     }
2749     default:
2750       fatal("JVM_GetCPFieldModifiers: illegal constant");
2751   }
2752   ShouldNotReachHere();
2753   return 0;
2754 JVM_END
2755 
2756 
2757 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2758   JVMWrapper("JVM_GetCPMethodModifiers");
2759   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2760   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2761   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2762   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2763   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2764   switch (cp->tag_at(cp_index).value()) {
2765     case JVM_CONSTANT_Methodref:
2766     case JVM_CONSTANT_InterfaceMethodref: {
2767       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2768       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2769       Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2770       int methods_count = methods->length();
2771       for (int i = 0; i < methods_count; i++) {
2772         Method* method = methods->at(i);
2773         if (method->name() == name && method->signature() == signature) {
2774             return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2775         }
2776       }
2777       return -1;
2778     }
2779     default:
2780       fatal("JVM_GetCPMethodModifiers: illegal constant");
2781   }
2782   ShouldNotReachHere();
2783   return 0;
2784 JVM_END
2785 
2786 
2787 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2788 
2789 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2790   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2791 JVM_END
2792 
2793 
2794 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2795   JVMWrapper("JVM_IsSameClassPackage");
2796   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2797   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2798   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2799   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2800   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2801 JVM_END
2802 
2803 // Printing support //////////////////////////////////////////////////
2804 extern "C" {
2805 
2806 ATTRIBUTE_PRINTF(3, 0)
2807 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2808   // Reject count values that are negative signed values converted to
2809   // unsigned; see bug 4399518, 4417214
2810   if ((intptr_t)count <= 0) return -1;
2811 
2812   int result = os::vsnprintf(str, count, fmt, args);
2813   if (result > 0 && (size_t)result >= count) {
2814     result = -1;
2815   }
2816 
2817   return result;
2818 }
2819 
2820 ATTRIBUTE_PRINTF(3, 4)
2821 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2822   va_list args;
2823   int len;
2824   va_start(args, fmt);
2825   len = jio_vsnprintf(str, count, fmt, args);
2826   va_end(args);
2827   return len;
2828 }
2829 
2830 ATTRIBUTE_PRINTF(2, 3)
2831 int jio_fprintf(FILE* f, const char *fmt, ...) {
2832   int len;
2833   va_list args;
2834   va_start(args, fmt);
2835   len = jio_vfprintf(f, fmt, args);
2836   va_end(args);
2837   return len;
2838 }
2839 
2840 ATTRIBUTE_PRINTF(2, 0)
2841 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2842   if (Arguments::vfprintf_hook() != NULL) {
2843      return Arguments::vfprintf_hook()(f, fmt, args);
2844   } else {
2845     return vfprintf(f, fmt, args);
2846   }
2847 }
2848 
2849 ATTRIBUTE_PRINTF(1, 2)
2850 JNIEXPORT int jio_printf(const char *fmt, ...) {
2851   int len;
2852   va_list args;
2853   va_start(args, fmt);
2854   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2855   va_end(args);
2856   return len;
2857 }
2858 
2859 // HotSpot specific jio method
2860 void jio_print(const char* s, size_t len) {
2861   // Try to make this function as atomic as possible.
2862   if (Arguments::vfprintf_hook() != NULL) {
2863     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2864   } else {
2865     // Make an unused local variable to avoid warning from gcc 4.x compiler.
2866     size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2867   }
2868 }
2869 
2870 } // Extern C
2871 
2872 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2873 
2874 // In most of the JVM thread support functions we need to access the
2875 // thread through a ThreadsListHandle to prevent it from exiting and
2876 // being reclaimed while we try to operate on it. The exceptions to this
2877 // rule are when operating on the current thread, or if the monitor of
2878 // the target java.lang.Thread is locked at the Java level - in both
2879 // cases the target cannot exit.
2880 
2881 static void thread_entry(JavaThread* thread, TRAPS) {
2882   HandleMark hm(THREAD);
2883   Handle obj(THREAD, thread->threadObj());
2884   JavaValue result(T_VOID);
2885   JavaCalls::call_virtual(&result,
2886                           obj,
2887                           SystemDictionary::Thread_klass(),
2888                           vmSymbols::run_method_name(),
2889                           vmSymbols::void_method_signature(),
2890                           THREAD);
2891 }
2892 
2893 
2894 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2895   JVMWrapper("JVM_StartThread");
2896   JavaThread *native_thread = NULL;
2897 
2898   // We cannot hold the Threads_lock when we throw an exception,
2899   // due to rank ordering issues. Example:  we might need to grab the
2900   // Heap_lock while we construct the exception.
2901   bool throw_illegal_thread_state = false;
2902 
2903   // We must release the Threads_lock before we can post a jvmti event
2904   // in Thread::start.
2905   {
2906     // Ensure that the C++ Thread and OSThread structures aren't freed before
2907     // we operate.
2908     MutexLocker mu(Threads_lock);
2909 
2910     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2911     // re-starting an already started thread, so we should usually find
2912     // that the JavaThread is null. However for a JNI attached thread
2913     // there is a small window between the Thread object being created
2914     // (with its JavaThread set) and the update to its threadStatus, so we
2915     // have to check for this
2916     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2917       throw_illegal_thread_state = true;
2918     } else {
2919       // We could also check the stillborn flag to see if this thread was already stopped, but
2920       // for historical reasons we let the thread detect that itself when it starts running
2921 
2922       jlong size =
2923              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2924       // Allocate the C++ Thread structure and create the native thread.  The
2925       // stack size retrieved from java is 64-bit signed, but the constructor takes
2926       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2927       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2928       //  - Avoid passing negative values which would result in really large stacks.
2929       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2930       size_t sz = size > 0 ? (size_t) size : 0;
2931       native_thread = new JavaThread(&thread_entry, sz);
2932 
2933       // At this point it may be possible that no osthread was created for the
2934       // JavaThread due to lack of memory. Check for this situation and throw
2935       // an exception if necessary. Eventually we may want to change this so
2936       // that we only grab the lock if the thread was created successfully -
2937       // then we can also do this check and throw the exception in the
2938       // JavaThread constructor.
2939       if (native_thread->osthread() != NULL) {
2940         // Note: the current thread is not being used within "prepare".
2941         native_thread->prepare(jthread);
2942       }
2943     }
2944   }
2945 
2946   if (throw_illegal_thread_state) {
2947     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2948   }
2949 
2950   assert(native_thread != NULL, "Starting null thread?");
2951 
2952   if (native_thread->osthread() == NULL) {
2953     // No one should hold a reference to the 'native_thread'.
2954     native_thread->smr_delete();
2955     if (JvmtiExport::should_post_resource_exhausted()) {
2956       JvmtiExport::post_resource_exhausted(
2957         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2958         os::native_thread_creation_failed_msg());
2959     }
2960     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2961               os::native_thread_creation_failed_msg());
2962   }
2963 
2964   Thread::start(native_thread);
2965 
2966 JVM_END
2967 
2968 
2969 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2970 // before the quasi-asynchronous exception is delivered.  This is a little obtrusive,
2971 // but is thought to be reliable and simple. In the case, where the receiver is the
2972 // same thread as the sender, no VM_Operation is needed.
2973 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2974   JVMWrapper("JVM_StopThread");
2975 
2976   // A nested ThreadsListHandle will grab the Threads_lock so create
2977   // tlh before we resolve throwable.
2978   ThreadsListHandle tlh(thread);
2979   oop java_throwable = JNIHandles::resolve(throwable);
2980   if (java_throwable == NULL) {
2981     THROW(vmSymbols::java_lang_NullPointerException());
2982   }
2983   oop java_thread = NULL;
2984   JavaThread* receiver = NULL;
2985   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2986   Events::log_exception(thread,
2987                         "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2988                         p2i(receiver), p2i((address)java_thread), p2i(throwable));
2989 
2990   if (is_alive) {
2991     // jthread refers to a live JavaThread.
2992     if (thread == receiver) {
2993       // Exception is getting thrown at self so no VM_Operation needed.
2994       THROW_OOP(java_throwable);
2995     } else {
2996       // Use a VM_Operation to throw the exception.
2997       Thread::send_async_exception(java_thread, java_throwable);
2998     }
2999   } else {
3000     // Either:
3001     // - target thread has not been started before being stopped, or
3002     // - target thread already terminated
3003     // We could read the threadStatus to determine which case it is
3004     // but that is overkill as it doesn't matter. We must set the
3005     // stillborn flag for the first case, and if the thread has already
3006     // exited setting this flag has no effect.
3007     java_lang_Thread::set_stillborn(java_thread);
3008   }
3009 JVM_END
3010 
3011 
3012 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3013   JVMWrapper("JVM_IsThreadAlive");
3014 
3015   oop thread_oop = JNIHandles::resolve_non_null(jthread);
3016   return java_lang_Thread::is_alive(thread_oop);
3017 JVM_END
3018 
3019 
3020 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3021   JVMWrapper("JVM_SuspendThread");
3022 
3023   ThreadsListHandle tlh(thread);
3024   JavaThread* receiver = NULL;
3025   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3026   if (is_alive) {
3027     // jthread refers to a live JavaThread.
3028     {
3029       MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3030       if (receiver->is_external_suspend()) {
3031         // Don't allow nested external suspend requests. We can't return
3032         // an error from this interface so just ignore the problem.
3033         return;
3034       }
3035       if (receiver->is_exiting()) { // thread is in the process of exiting
3036         return;
3037       }
3038       receiver->set_external_suspend();
3039     }
3040 
3041     // java_suspend() will catch threads in the process of exiting
3042     // and will ignore them.
3043     receiver->java_suspend();
3044 
3045     // It would be nice to have the following assertion in all the
3046     // time, but it is possible for a racing resume request to have
3047     // resumed this thread right after we suspended it. Temporarily
3048     // enable this assertion if you are chasing a different kind of
3049     // bug.
3050     //
3051     // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3052     //   receiver->is_being_ext_suspended(), "thread is not suspended");
3053   }
3054 JVM_END
3055 
3056 
3057 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3058   JVMWrapper("JVM_ResumeThread");
3059 
3060   ThreadsListHandle tlh(thread);
3061   JavaThread* receiver = NULL;
3062   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3063   if (is_alive) {
3064     // jthread refers to a live JavaThread.
3065 
3066     // This is the original comment for this Threads_lock grab:
3067     //   We need to *always* get the threads lock here, since this operation cannot be allowed during
3068     //   a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3069     //   threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3070     //   looks at it.
3071     //
3072     // The above comment dates back to when we had both internal and
3073     // external suspend APIs that shared a common underlying mechanism.
3074     // External suspend is now entirely cooperative and doesn't share
3075     // anything with internal suspend. That said, there are some
3076     // assumptions in the VM that an external resume grabs the
3077     // Threads_lock. We can't drop the Threads_lock grab here until we
3078     // resolve the assumptions that exist elsewhere.
3079     //
3080     MutexLocker ml(Threads_lock);
3081     receiver->java_resume();
3082   }
3083 JVM_END
3084 
3085 
3086 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3087   JVMWrapper("JVM_SetThreadPriority");
3088 
3089   ThreadsListHandle tlh(thread);
3090   oop java_thread = NULL;
3091   JavaThread* receiver = NULL;
3092   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3093   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3094 
3095   if (is_alive) {
3096     // jthread refers to a live JavaThread.
3097     Thread::set_priority(receiver, (ThreadPriority)prio);
3098   }
3099   // Implied else: If the JavaThread hasn't started yet, then the
3100   // priority set in the java.lang.Thread object above will be pushed
3101   // down when it does start.
3102 JVM_END
3103 
3104 
3105 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3106   JVMWrapper("JVM_Yield");
3107   if (os::dont_yield()) return;
3108   HOTSPOT_THREAD_YIELD();
3109   os::naked_yield();
3110 JVM_END
3111 
3112 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3113   assert(event != NULL, "invariant");
3114   assert(event->should_commit(), "invariant");
3115   event->set_time(millis);
3116   event->commit();
3117 }
3118 
3119 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3120   JVMWrapper("JVM_Sleep");
3121 
3122   if (millis < 0) {
3123     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3124   }
3125 
3126   if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3127     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3128   }
3129 
3130   // Save current thread state and restore it at the end of this block.
3131   // And set new thread state to SLEEPING.
3132   JavaThreadSleepState jtss(thread);
3133 
3134   HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3135   EventThreadSleep event;
3136 
3137   if (millis == 0) {
3138     os::naked_yield();
3139   } else {
3140     ThreadState old_state = thread->osthread()->get_state();
3141     thread->osthread()->set_state(SLEEPING);
3142     if (os::sleep(thread, millis, true) == OS_INTRPT) {
3143       // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3144       // us while we were sleeping. We do not overwrite those.
3145       if (!HAS_PENDING_EXCEPTION) {
3146         if (event.should_commit()) {
3147           post_thread_sleep_event(&event, millis);
3148         }
3149         HOTSPOT_THREAD_SLEEP_END(1);
3150 
3151         // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3152         // to properly restore the thread state.  That's likely wrong.
3153         THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3154       }
3155     }
3156     thread->osthread()->set_state(old_state);
3157   }
3158   if (event.should_commit()) {
3159     post_thread_sleep_event(&event, millis);
3160   }
3161   HOTSPOT_THREAD_SLEEP_END(0);
3162 JVM_END
3163 
3164 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3165   JVMWrapper("JVM_CurrentThread");
3166   oop jthread = thread->threadObj();
3167   assert (thread != NULL, "no current thread!");
3168   return JNIHandles::make_local(env, jthread);
3169 JVM_END
3170 
3171 
3172 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3173   JVMWrapper("JVM_CountStackFrames");
3174 
3175   uint32_t debug_bits = 0;
3176   ThreadsListHandle tlh(thread);
3177   JavaThread* receiver = NULL;
3178   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3179   int count = 0;
3180   if (is_alive) {
3181     // jthread refers to a live JavaThread.
3182     if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3183       // Count all java activation, i.e., number of vframes.
3184       for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3185         // Native frames are not counted.
3186         if (!vfst.method()->is_native()) count++;
3187       }
3188     } else {
3189       THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3190                   "this thread is not suspended");
3191     }
3192   }
3193   // Implied else: if JavaThread is not alive simply return a count of 0.
3194 
3195   return count;
3196 JVM_END
3197 
3198 
3199 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3200   JVMWrapper("JVM_Interrupt");
3201 
3202   ThreadsListHandle tlh(thread);
3203   JavaThread* receiver = NULL;
3204   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3205   if (is_alive) {
3206     // jthread refers to a live JavaThread.
3207     Thread::interrupt(receiver);
3208   }
3209 JVM_END
3210 
3211 
3212 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3213   JVMWrapper("JVM_IsInterrupted");
3214 
3215   ThreadsListHandle tlh(thread);
3216   JavaThread* receiver = NULL;
3217   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3218   if (is_alive) {
3219     // jthread refers to a live JavaThread.
3220     return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3221   } else {
3222     return JNI_FALSE;
3223   }
3224 JVM_END
3225 
3226 
3227 // Return true iff the current thread has locked the object passed in
3228 
3229 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3230   JVMWrapper("JVM_HoldsLock");
3231   assert(THREAD->is_Java_thread(), "sanity check");
3232   if (obj == NULL) {
3233     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3234   }
3235   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3236   return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3237 JVM_END
3238 
3239 
3240 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3241   JVMWrapper("JVM_DumpAllStacks");
3242   VM_PrintThreads op;
3243   VMThread::execute(&op);
3244   if (JvmtiExport::should_post_data_dump()) {
3245     JvmtiExport::post_data_dump();
3246   }
3247 JVM_END
3248 
3249 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3250   JVMWrapper("JVM_SetNativeThreadName");
3251 
3252   // We don't use a ThreadsListHandle here because the current thread
3253   // must be alive.
3254   oop java_thread = JNIHandles::resolve_non_null(jthread);
3255   JavaThread* thr = java_lang_Thread::thread(java_thread);
3256   if (thread == thr && !thr->has_attached_via_jni()) {
3257     // Thread naming is only supported for the current thread and
3258     // we don't set the name of an attached thread to avoid stepping
3259     // on other programs.
3260     ResourceMark rm(thread);
3261     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3262     os::set_native_thread_name(thread_name);
3263   }
3264 JVM_END
3265 
3266 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3267 
3268 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3269   JVMWrapper("JVM_GetClassContext");
3270   ResourceMark rm(THREAD);
3271   JvmtiVMObjectAllocEventCollector oam;
3272   vframeStream vfst(thread);
3273 
3274   if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3275     // This must only be called from SecurityManager.getClassContext
3276     Method* m = vfst.method();
3277     if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3278           m->name()          == vmSymbols::getClassContext_name() &&
3279           m->signature()     == vmSymbols::void_class_array_signature())) {
3280       THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3281     }
3282   }
3283 
3284   // Collect method holders
3285   GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3286   for (; !vfst.at_end(); vfst.security_next()) {
3287     Method* m = vfst.method();
3288     // Native frames are not returned
3289     if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3290       Klass* holder = m->method_holder();
3291       assert(holder->is_klass(), "just checking");
3292       klass_array->append(holder);
3293     }
3294   }
3295 
3296   // Create result array of type [Ljava/lang/Class;
3297   objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3298   // Fill in mirrors corresponding to method holders
3299   for (int i = 0; i < klass_array->length(); i++) {
3300     result->obj_at_put(i, klass_array->at(i)->java_mirror());
3301   }
3302 
3303   return (jobjectArray) JNIHandles::make_local(env, result);
3304 JVM_END
3305 
3306 
3307 // java.lang.Package ////////////////////////////////////////////////////////////////
3308 
3309 
3310 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3311   JVMWrapper("JVM_GetSystemPackage");
3312   ResourceMark rm(THREAD);
3313   JvmtiVMObjectAllocEventCollector oam;
3314   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3315   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3316   return (jstring) JNIHandles::make_local(result);
3317 JVM_END
3318 
3319 
3320 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3321   JVMWrapper("JVM_GetSystemPackages");
3322   JvmtiVMObjectAllocEventCollector oam;
3323   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3324   return (jobjectArray) JNIHandles::make_local(result);
3325 JVM_END
3326 
3327 
3328 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3329 
3330 
3331 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3332   JVMWrapper("JVM_GetAndClearReferencePendingList");
3333 
3334   MonitorLockerEx ml(Heap_lock);
3335   oop ref = Universe::reference_pending_list();
3336   if (ref != NULL) {
3337     Universe::set_reference_pending_list(NULL);
3338   }
3339   return JNIHandles::make_local(env, ref);
3340 JVM_END
3341 
3342 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3343   JVMWrapper("JVM_HasReferencePendingList");
3344   MonitorLockerEx ml(Heap_lock);
3345   return Universe::has_reference_pending_list();
3346 JVM_END
3347 
3348 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3349   JVMWrapper("JVM_WaitForReferencePendingList");
3350   MonitorLockerEx ml(Heap_lock);
3351   while (!Universe::has_reference_pending_list()) {
3352     ml.wait();
3353   }
3354 JVM_END
3355 
3356 
3357 // ObjectInputStream ///////////////////////////////////////////////////////////////
3358 
3359 // Return the first user-defined class loader up the execution stack, or null
3360 // if only code from the bootstrap or platform class loader is on the stack.
3361 
3362 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3363   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3364     vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3365     oop loader = vfst.method()->method_holder()->class_loader();
3366     if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3367       return JNIHandles::make_local(env, loader);
3368     }
3369   }
3370   return NULL;
3371 JVM_END
3372 
3373 
3374 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3375 
3376 
3377 // resolve array handle and check arguments
3378 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3379   if (arr == NULL) {
3380     THROW_0(vmSymbols::java_lang_NullPointerException());
3381   }
3382   oop a = JNIHandles::resolve_non_null(arr);
3383   if (!a->is_array()) {
3384     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3385   } else if (type_array_only && !a->is_typeArray()) {
3386     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3387   }
3388   return arrayOop(a);
3389 }
3390 
3391 
3392 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3393   JVMWrapper("JVM_GetArrayLength");
3394   arrayOop a = check_array(env, arr, false, CHECK_0);
3395   return a->length();
3396 JVM_END
3397 
3398 
3399 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3400   JVMWrapper("JVM_Array_Get");
3401   JvmtiVMObjectAllocEventCollector oam;
3402   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3403   jvalue value;
3404   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3405   oop box = Reflection::box(&value, type, CHECK_NULL);
3406   return JNIHandles::make_local(env, box);
3407 JVM_END
3408 
3409 
3410 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3411   JVMWrapper("JVM_GetPrimitiveArrayElement");
3412   jvalue value;
3413   value.i = 0; // to initialize value before getting used in CHECK
3414   arrayOop a = check_array(env, arr, true, CHECK_(value));
3415   assert(a->is_typeArray(), "just checking");
3416   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3417   BasicType wide_type = (BasicType) wCode;
3418   if (type != wide_type) {
3419     Reflection::widen(&value, type, wide_type, CHECK_(value));
3420   }
3421   return value;
3422 JVM_END
3423 
3424 
3425 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3426   JVMWrapper("JVM_SetArrayElement");
3427   arrayOop a = check_array(env, arr, false, CHECK);
3428   oop box = JNIHandles::resolve(val);
3429   jvalue value;
3430   value.i = 0; // to initialize value before getting used in CHECK
3431   BasicType value_type;
3432   if (a->is_objArray()) {
3433     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3434     value_type = Reflection::unbox_for_regular_object(box, &value);
3435   } else {
3436     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3437   }
3438   Reflection::array_set(&value, a, index, value_type, CHECK);
3439 JVM_END
3440 
3441 
3442 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3443   JVMWrapper("JVM_SetPrimitiveArrayElement");
3444   arrayOop a = check_array(env, arr, true, CHECK);
3445   assert(a->is_typeArray(), "just checking");
3446   BasicType value_type = (BasicType) vCode;
3447   Reflection::array_set(&v, a, index, value_type, CHECK);
3448 JVM_END
3449 
3450 
3451 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3452   JVMWrapper("JVM_NewArray");
3453   JvmtiVMObjectAllocEventCollector oam;
3454   oop element_mirror = JNIHandles::resolve(eltClass);
3455   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3456   return JNIHandles::make_local(env, result);
3457 JVM_END
3458 
3459 
3460 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3461   JVMWrapper("JVM_NewMultiArray");
3462   JvmtiVMObjectAllocEventCollector oam;
3463   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3464   oop element_mirror = JNIHandles::resolve(eltClass);
3465   assert(dim_array->is_typeArray(), "just checking");
3466   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3467   return JNIHandles::make_local(env, result);
3468 JVM_END
3469 
3470 
3471 // Library support ///////////////////////////////////////////////////////////////////////////
3472 
3473 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3474   //%note jvm_ct
3475   JVMWrapper("JVM_LoadLibrary");
3476   char ebuf[1024];
3477   void *load_result;
3478   {
3479     ThreadToNativeFromVM ttnfvm(thread);
3480     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3481   }
3482   if (load_result == NULL) {
3483     char msg[1024];
3484     jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3485     // Since 'ebuf' may contain a string encoded using
3486     // platform encoding scheme, we need to pass
3487     // Exceptions::unsafe_to_utf8 to the new_exception method
3488     // as the last argument. See bug 6367357.
3489     Handle h_exception =
3490       Exceptions::new_exception(thread,
3491                                 vmSymbols::java_lang_UnsatisfiedLinkError(),
3492                                 msg, Exceptions::unsafe_to_utf8);
3493 
3494     THROW_HANDLE_0(h_exception);
3495   }
3496   return load_result;
3497 JVM_END
3498 
3499 
3500 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3501   JVMWrapper("JVM_UnloadLibrary");
3502   os::dll_unload(handle);
3503 JVM_END
3504 
3505 
3506 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3507   JVMWrapper("JVM_FindLibraryEntry");
3508   return os::dll_lookup(handle, name);
3509 JVM_END
3510 
3511 
3512 // JNI version ///////////////////////////////////////////////////////////////////////////////
3513 
3514 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3515   JVMWrapper("JVM_IsSupportedJNIVersion");
3516   return Threads::is_supported_jni_version_including_1_1(version);
3517 JVM_END
3518 
3519 
3520 // String support ///////////////////////////////////////////////////////////////////////////
3521 
3522 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3523   JVMWrapper("JVM_InternString");
3524   JvmtiVMObjectAllocEventCollector oam;
3525   if (str == NULL) return NULL;
3526   oop string = JNIHandles::resolve_non_null(str);
3527   oop result = StringTable::intern(string, CHECK_NULL);
3528   return (jstring) JNIHandles::make_local(env, result);
3529 JVM_END
3530 
3531 
3532 // Raw monitor support //////////////////////////////////////////////////////////////////////
3533 
3534 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3535 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3536 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3537 // that only works with java threads.
3538 
3539 
3540 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3541   VM_Exit::block_if_vm_exited();
3542   JVMWrapper("JVM_RawMonitorCreate");
3543   return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3544 }
3545 
3546 
3547 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3548   VM_Exit::block_if_vm_exited();
3549   JVMWrapper("JVM_RawMonitorDestroy");
3550   delete ((Mutex*) mon);
3551 }
3552 
3553 
3554 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3555   VM_Exit::block_if_vm_exited();
3556   JVMWrapper("JVM_RawMonitorEnter");
3557   ((Mutex*) mon)->jvm_raw_lock();
3558   return 0;
3559 }
3560 
3561 
3562 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3563   VM_Exit::block_if_vm_exited();
3564   JVMWrapper("JVM_RawMonitorExit");
3565   ((Mutex*) mon)->jvm_raw_unlock();
3566 }
3567 
3568 
3569 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3570 
3571 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3572                                     Handle loader, Handle protection_domain,
3573                                     jboolean throwError, TRAPS) {
3574   // Security Note:
3575   //   The Java level wrapper will perform the necessary security check allowing
3576   //   us to pass the NULL as the initiating class loader.  The VM is responsible for
3577   //   the checkPackageAccess relative to the initiating class loader via the
3578   //   protection_domain. The protection_domain is passed as NULL by the java code
3579   //   if there is no security manager in 3-arg Class.forName().
3580   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3581 
3582   // Check if we should initialize the class
3583   if (init && klass->is_instance_klass()) {
3584     klass->initialize(CHECK_NULL);
3585   }
3586   return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3587 }
3588 
3589 
3590 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3591 
3592 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3593   JVMWrapper("JVM_InvokeMethod");
3594   Handle method_handle;
3595   if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3596     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3597     Handle receiver(THREAD, JNIHandles::resolve(obj));
3598     objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3599     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3600     jobject res = JNIHandles::make_local(env, result);
3601     if (JvmtiExport::should_post_vm_object_alloc()) {
3602       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3603       assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3604       if (java_lang_Class::is_primitive(ret_type)) {
3605         // Only for primitive type vm allocates memory for java object.
3606         // See box() method.
3607         JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3608       }
3609     }
3610     return res;
3611   } else {
3612     THROW_0(vmSymbols::java_lang_StackOverflowError());
3613   }
3614 JVM_END
3615 
3616 
3617 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3618   JVMWrapper("JVM_NewInstanceFromConstructor");
3619   oop constructor_mirror = JNIHandles::resolve(c);
3620   objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3621   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3622   jobject res = JNIHandles::make_local(env, result);
3623   if (JvmtiExport::should_post_vm_object_alloc()) {
3624     JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3625   }
3626   return res;
3627 JVM_END
3628 
3629 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3630 
3631 JVM_LEAF(jboolean, JVM_SupportsCX8())
3632   JVMWrapper("JVM_SupportsCX8");
3633   return VM_Version::supports_cx8();
3634 JVM_END
3635 
3636 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3637   JVMWrapper("JVM_InitializeFromArchive");
3638   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3639   assert(k->is_klass(), "just checking");
3640   HeapShared::initialize_from_archived_subgraph(k);
3641 JVM_END
3642 
3643 // Returns an array of all live Thread objects (VM internal JavaThreads,
3644 // jvmti agent threads, and JNI attaching threads  are skipped)
3645 // See CR 6404306 regarding JNI attaching threads
3646 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3647   ResourceMark rm(THREAD);
3648   ThreadsListEnumerator tle(THREAD, false, false);
3649   JvmtiVMObjectAllocEventCollector oam;
3650 
3651   int num_threads = tle.num_threads();
3652   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3653   objArrayHandle threads_ah(THREAD, r);
3654 
3655   for (int i = 0; i < num_threads; i++) {
3656     Handle h = tle.get_threadObj(i);
3657     threads_ah->obj_at_put(i, h());
3658   }
3659 
3660   return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3661 JVM_END
3662 
3663 
3664 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3665 // Return StackTraceElement[][], each element is the stack trace of a thread in
3666 // the corresponding entry in the given threads array
3667 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3668   JVMWrapper("JVM_DumpThreads");
3669   JvmtiVMObjectAllocEventCollector oam;
3670 
3671   // Check if threads is null
3672   if (threads == NULL) {
3673     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3674   }
3675 
3676   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3677   objArrayHandle ah(THREAD, a);
3678   int num_threads = ah->length();
3679   // check if threads is non-empty array
3680   if (num_threads == 0) {
3681     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3682   }
3683 
3684   // check if threads is not an array of objects of Thread class
3685   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3686   if (k != SystemDictionary::Thread_klass()) {
3687     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3688   }
3689 
3690   ResourceMark rm(THREAD);
3691 
3692   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3693   for (int i = 0; i < num_threads; i++) {
3694     oop thread_obj = ah->obj_at(i);
3695     instanceHandle h(THREAD, (instanceOop) thread_obj);
3696     thread_handle_array->append(h);
3697   }
3698 
3699   // The JavaThread references in thread_handle_array are validated
3700   // in VM_ThreadDump::doit().
3701   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3702   return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3703 
3704 JVM_END
3705 
3706 // JVM monitoring and management support
3707 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3708   return Management::get_jmm_interface(version);
3709 JVM_END
3710 
3711 // com.sun.tools.attach.VirtualMachine agent properties support
3712 //
3713 // Initialize the agent properties with the properties maintained in the VM
3714 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3715   JVMWrapper("JVM_InitAgentProperties");
3716   ResourceMark rm;
3717 
3718   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3719 
3720   PUTPROP(props, "sun.java.command", Arguments::java_command());
3721   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3722   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3723   return properties;
3724 JVM_END
3725 
3726 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3727 {
3728   JVMWrapper("JVM_GetEnclosingMethodInfo");
3729   JvmtiVMObjectAllocEventCollector oam;
3730 
3731   if (ofClass == NULL) {
3732     return NULL;
3733   }
3734   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3735   // Special handling for primitive objects
3736   if (java_lang_Class::is_primitive(mirror())) {
3737     return NULL;
3738   }
3739   Klass* k = java_lang_Class::as_Klass(mirror());
3740   if (!k->is_instance_klass()) {
3741     return NULL;
3742   }
3743   InstanceKlass* ik = InstanceKlass::cast(k);
3744   int encl_method_class_idx = ik->enclosing_method_class_index();
3745   if (encl_method_class_idx == 0) {
3746     return NULL;
3747   }
3748   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3749   objArrayHandle dest(THREAD, dest_o);
3750   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3751   dest->obj_at_put(0, enc_k->java_mirror());
3752   int encl_method_method_idx = ik->enclosing_method_method_index();
3753   if (encl_method_method_idx != 0) {
3754     Symbol* sym = ik->constants()->symbol_at(
3755                         extract_low_short_from_int(
3756                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3757     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3758     dest->obj_at_put(1, str());
3759     sym = ik->constants()->symbol_at(
3760               extract_high_short_from_int(
3761                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3762     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3763     dest->obj_at_put(2, str());
3764   }
3765   return (jobjectArray) JNIHandles::make_local(dest());
3766 }
3767 JVM_END
3768 
3769 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3770 {
3771   memset(info, 0, info_size);
3772 
3773   info->jvm_version = VM_Version::jvm_version();
3774   info->patch_version = VM_Version::vm_patch_version();
3775 
3776   // when we add a new capability in the jvm_version_info struct, we should also
3777   // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3778   // counter defined in runtimeService.cpp.
3779   info->is_attach_supported = AttachListener::is_attach_supported();
3780 }
3781 JVM_END
3782 
3783 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3784 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3785   ResourceMark rm(THREAD);
3786 
3787   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3788     return NULL;
3789   }
3790 
3791   char** vm_flags = Arguments::jvm_flags_array();
3792   char** vm_args = Arguments::jvm_args_array();
3793   int num_flags = Arguments::num_jvm_flags();
3794   int num_args = Arguments::num_jvm_args();
3795 
3796   InstanceKlass* ik = SystemDictionary::String_klass();
3797   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3798   objArrayHandle result_h(THREAD, r);
3799 
3800   int index = 0;
3801   for (int j = 0; j < num_flags; j++, index++) {
3802     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3803     result_h->obj_at_put(index, h());
3804   }
3805   for (int i = 0; i < num_args; i++, index++) {
3806     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3807     result_h->obj_at_put(index, h());
3808   }
3809   return (jobjectArray) JNIHandles::make_local(env, result_h());
3810 JVM_END
3811 
3812 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3813   return os::get_signal_number(name);
3814 JVM_END