1 /*
   2  * Copyright (c) 1997, 2017, 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 "classfile/classFileStream.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/classLoaderData.inline.hpp"
  29 #include "classfile/javaAssertions.hpp"
  30 #include "classfile/javaClasses.inline.hpp"
  31 #include "classfile/moduleEntry.hpp"
  32 #include "classfile/modules.hpp"
  33 #include "classfile/packageEntry.hpp"
  34 #include "classfile/stringTable.hpp"
  35 #include "classfile/systemDictionary.hpp"
  36 #include "classfile/vmSymbols.hpp"
  37 #include "gc/shared/barrierSet.inline.hpp"
  38 #include "gc/shared/collectedHeap.inline.hpp"
  39 #include "interpreter/bytecode.hpp"
  40 #include "memory/oopFactory.hpp"
  41 #include "memory/resourceArea.hpp"
  42 #include "memory/universe.inline.hpp"
  43 #include "oops/fieldStreams.hpp"
  44 #include "oops/instanceKlass.hpp"
  45 #include "oops/method.hpp"
  46 #include "oops/objArrayKlass.hpp"
  47 #include "oops/objArrayOop.inline.hpp"
  48 #include "oops/oop.inline.hpp"
  49 #include "prims/jvm.h"
  50 #include "prims/jvm_misc.hpp"
  51 #include "prims/jvmtiExport.hpp"
  52 #include "prims/jvmtiThreadState.hpp"
  53 #include "prims/nativeLookup.hpp"
  54 #include "prims/privilegedStack.hpp"
  55 #include "prims/stackwalk.hpp"
  56 #include "runtime/arguments.hpp"
  57 #include "runtime/atomic.hpp"
  58 #include "runtime/handles.inline.hpp"
  59 #include "runtime/init.hpp"
  60 #include "runtime/interfaceSupport.hpp"
  61 #include "runtime/java.hpp"
  62 #include "runtime/javaCalls.hpp"
  63 #include "runtime/jfieldIDWorkaround.hpp"
  64 #include "runtime/orderAccess.inline.hpp"
  65 #include "runtime/os.inline.hpp"
  66 #include "runtime/perfData.hpp"
  67 #include "runtime/reflection.hpp"
  68 #include "runtime/thread.inline.hpp"
  69 #include "runtime/vframe.hpp"
  70 #include "runtime/vm_operations.hpp"
  71 #include "runtime/vm_version.hpp"
  72 #include "services/attachListener.hpp"
  73 #include "services/management.hpp"
  74 #include "services/threadService.hpp"
  75 #include "trace/tracing.hpp"
  76 #include "utilities/copy.hpp"
  77 #include "utilities/defaultStream.hpp"
  78 #include "utilities/dtrace.hpp"
  79 #include "utilities/events.hpp"
  80 #include "utilities/histogram.hpp"
  81 #include "utilities/macros.hpp"
  82 #include "utilities/utf8.hpp"
  83 #if INCLUDE_CDS
  84 #include "classfile/sharedClassUtil.hpp"
  85 #include "classfile/systemDictionaryShared.hpp"
  86 #endif
  87 
  88 #include <errno.h>
  89 
  90 /*
  91   NOTE about use of any ctor or function call that can trigger a safepoint/GC:
  92   such ctors and calls MUST NOT come between an oop declaration/init and its
  93   usage because if objects are move this may cause various memory stomps, bus
  94   errors and segfaults. Here is a cookbook for causing so called "naked oop
  95   failures":
  96 
  97       JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
  98           JVMWrapper("JVM_GetClassDeclaredFields");
  99 
 100           // Object address to be held directly in mirror & not visible to GC
 101           oop mirror = JNIHandles::resolve_non_null(ofClass);
 102 
 103           // If this ctor can hit a safepoint, moving objects around, then
 104           ComplexConstructor foo;
 105 
 106           // Boom! mirror may point to JUNK instead of the intended object
 107           (some dereference of mirror)
 108 
 109           // Here's another call that may block for GC, making mirror stale
 110           MutexLocker ml(some_lock);
 111 
 112           // And here's an initializer that can result in a stale oop
 113           // all in one step.
 114           oop o = call_that_can_throw_exception(TRAPS);
 115 
 116 
 117   The solution is to keep the oop declaration BELOW the ctor or function
 118   call that might cause a GC, do another resolve to reassign the oop, or
 119   consider use of a Handle instead of an oop so there is immunity from object
 120   motion. But note that the "QUICK" entries below do not have a handlemark
 121   and thus can only support use of handles passed in.
 122 */
 123 
 124 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
 125   ResourceMark rm;
 126   int line_number = -1;
 127   const char * source_file = NULL;
 128   const char * trace = "explicit";
 129   InstanceKlass* caller = NULL;
 130   JavaThread* jthread = JavaThread::current();
 131   if (jthread->has_last_Java_frame()) {
 132     vframeStream vfst(jthread);
 133 
 134     // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
 135     TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
 136     Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
 137     TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
 138     Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
 139 
 140     Method* last_caller = NULL;
 141 
 142     while (!vfst.at_end()) {
 143       Method* m = vfst.method();
 144       if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
 145           !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
 146           !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
 147         break;
 148       }
 149       last_caller = m;
 150       vfst.next();
 151     }
 152     // if this is called from Class.forName0 and that is called from Class.forName,
 153     // then print the caller of Class.forName.  If this is Class.loadClass, then print
 154     // that caller, otherwise keep quiet since this should be picked up elsewhere.
 155     bool found_it = false;
 156     if (!vfst.at_end() &&
 157         vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 158         vfst.method()->name() == vmSymbols::forName0_name()) {
 159       vfst.next();
 160       if (!vfst.at_end() &&
 161           vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 162           vfst.method()->name() == vmSymbols::forName_name()) {
 163         vfst.next();
 164         found_it = true;
 165       }
 166     } else if (last_caller != NULL &&
 167                last_caller->method_holder()->name() ==
 168                vmSymbols::java_lang_ClassLoader() &&
 169                (last_caller->name() == vmSymbols::loadClassInternal_name() ||
 170                 last_caller->name() == vmSymbols::loadClass_name())) {
 171       found_it = true;
 172     } else if (!vfst.at_end()) {
 173       if (vfst.method()->is_native()) {
 174         // JNI call
 175         found_it = true;
 176       }
 177     }
 178     if (found_it && !vfst.at_end()) {
 179       // found the caller
 180       caller = vfst.method()->method_holder();
 181       line_number = vfst.method()->line_number_from_bci(vfst.bci());
 182       if (line_number == -1) {
 183         // show method name if it's a native method
 184         trace = vfst.method()->name_and_sig_as_C_string();
 185       }
 186       Symbol* s = caller->source_file_name();
 187       if (s != NULL) {
 188         source_file = s->as_C_string();
 189       }
 190     }
 191   }
 192   if (caller != NULL) {
 193     if (to_class != caller) {
 194       const char * from = caller->external_name();
 195       const char * to = to_class->external_name();
 196       // print in a single call to reduce interleaving between threads
 197       if (source_file != NULL) {
 198         log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
 199       } else {
 200         log_debug(class, resolve)("%s %s (%s)", from, to, trace);
 201       }
 202     }
 203   }
 204 }
 205 
 206 void trace_class_resolution(Klass* to_class) {
 207   EXCEPTION_MARK;
 208   trace_class_resolution_impl(to_class, THREAD);
 209   if (HAS_PENDING_EXCEPTION) {
 210     CLEAR_PENDING_EXCEPTION;
 211   }
 212 }
 213 
 214 // Wrapper to trace JVM functions
 215 
 216 #ifdef ASSERT
 217   Histogram* JVMHistogram;
 218   volatile jint JVMHistogram_lock = 0;
 219 
 220   class JVMHistogramElement : public HistogramElement {
 221     public:
 222      JVMHistogramElement(const char* name);
 223   };
 224 
 225   JVMHistogramElement::JVMHistogramElement(const char* elementName) {
 226     _name = elementName;
 227     uintx count = 0;
 228 
 229     while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
 230       while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
 231         count +=1;
 232         if ( (WarnOnStalledSpinLock > 0)
 233           && (count % WarnOnStalledSpinLock == 0)) {
 234           warning("JVMHistogram_lock seems to be stalled");
 235         }
 236       }
 237      }
 238 
 239     if(JVMHistogram == NULL)
 240       JVMHistogram = new Histogram("JVM Call Counts",100);
 241 
 242     JVMHistogram->add_element(this);
 243     Atomic::dec(&JVMHistogram_lock);
 244   }
 245 
 246   #define JVMCountWrapper(arg) \
 247       static JVMHistogramElement* e = new JVMHistogramElement(arg); \
 248       if (e != NULL) e->increment_count();  // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
 249 
 250   #define JVMWrapper(arg) JVMCountWrapper(arg);
 251 #else
 252   #define JVMWrapper(arg)
 253 #endif
 254 
 255 
 256 // Interface version /////////////////////////////////////////////////////////////////////
 257 
 258 
 259 JVM_LEAF(jint, JVM_GetInterfaceVersion())
 260   return JVM_INTERFACE_VERSION;
 261 JVM_END
 262 
 263 
 264 // java.lang.System //////////////////////////////////////////////////////////////////////
 265 
 266 
 267 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
 268   JVMWrapper("JVM_CurrentTimeMillis");
 269   return os::javaTimeMillis();
 270 JVM_END
 271 
 272 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
 273   JVMWrapper("JVM_NanoTime");
 274   return os::javaTimeNanos();
 275 JVM_END
 276 
 277 // The function below is actually exposed by jdk.internal.misc.VM and not
 278 // java.lang.System, but we choose to keep it here so that it stays next
 279 // to JVM_CurrentTimeMillis and JVM_NanoTime
 280 
 281 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); //  2^32
 282 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
 283 
 284 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
 285   JVMWrapper("JVM_GetNanoTimeAdjustment");
 286   jlong seconds;
 287   jlong nanos;
 288 
 289   os::javaTimeSystemUTC(seconds, nanos);
 290 
 291   // We're going to verify that the result can fit in a long.
 292   // For that we need the difference in seconds between 'seconds'
 293   // and 'offset_secs' to be such that:
 294   //     |seconds - offset_secs| < (2^63/10^9)
 295   // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
 296   // which makes |seconds - offset_secs| < 2^33
 297   // and we will prefer +/- 2^32 as the maximum acceptable diff
 298   // as 2^32 has a more natural feel than 2^33...
 299   //
 300   // So if |seconds - offset_secs| >= 2^32 - we return a special
 301   // sentinel value (-1) which the caller should take as an
 302   // exception value indicating that the offset given to us is
 303   // too far from range of the current time - leading to too big
 304   // a nano adjustment. The caller is expected to recover by
 305   // computing a more accurate offset and calling this method
 306   // again. (For the record 2^32 secs is ~136 years, so that
 307   // should rarely happen)
 308   //
 309   jlong diff = seconds - offset_secs;
 310   if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
 311      return -1; // sentinel value: the offset is too far off the target
 312   }
 313 
 314   // return the adjustment. If you compute a time by adding
 315   // this number of nanoseconds along with the number of seconds
 316   // in the offset you should get the current UTC time.
 317   return (diff * (jlong)1000000000) + nanos;
 318 JVM_END
 319 
 320 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
 321                                jobject dst, jint dst_pos, jint length))
 322   JVMWrapper("JVM_ArrayCopy");
 323   // Check if we have null pointers
 324   if (src == NULL || dst == NULL) {
 325     THROW(vmSymbols::java_lang_NullPointerException());
 326   }
 327   arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
 328   arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
 329   assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
 330   assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
 331   // Do copy
 332   s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
 333 JVM_END
 334 
 335 
 336 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
 337   JavaValue r(T_OBJECT);
 338   // public synchronized Object put(Object key, Object value);
 339   HandleMark hm(THREAD);
 340   Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK);
 341   Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
 342   JavaCalls::call_virtual(&r,
 343                           props,
 344                           SystemDictionary::Properties_klass(),
 345                           vmSymbols::put_name(),
 346                           vmSymbols::object_object_object_signature(),
 347                           key_str,
 348                           value_str,
 349                           THREAD);
 350 }
 351 
 352 
 353 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
 354 
 355 
 356 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
 357   JVMWrapper("JVM_InitProperties");
 358   ResourceMark rm;
 359 
 360   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
 361 
 362   // System property list includes both user set via -D option and
 363   // jvm system specific properties.
 364   for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
 365     PUTPROP(props, p->key(), p->value());
 366   }
 367 
 368   // Convert the -XX:MaxDirectMemorySize= command line flag
 369   // to the sun.nio.MaxDirectMemorySize property.
 370   // Do this after setting user properties to prevent people
 371   // from setting the value with a -D option, as requested.
 372   {
 373     if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
 374       PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
 375     } else {
 376       char as_chars[256];
 377       jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
 378       PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
 379     }
 380   }
 381 
 382   // JVM monitoring and management support
 383   // Add the sun.management.compiler property for the compiler's name
 384   {
 385 #undef CSIZE
 386 #if defined(_LP64) || defined(_WIN64)
 387   #define CSIZE "64-Bit "
 388 #else
 389   #define CSIZE
 390 #endif // 64bit
 391 
 392 #ifdef TIERED
 393     const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
 394 #else
 395 #if defined(COMPILER1)
 396     const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
 397 #elif defined(COMPILER2)
 398     const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
 399 #elif INCLUDE_JVMCI
 400     #error "INCLUDE_JVMCI should imply TIERED"
 401 #else
 402     const char* compiler_name = "";
 403 #endif // compilers
 404 #endif // TIERED
 405 
 406     if (*compiler_name != '\0' &&
 407         (Arguments::mode() != Arguments::_int)) {
 408       PUTPROP(props, "sun.management.compiler", compiler_name);
 409     }
 410   }
 411 
 412   return properties;
 413 JVM_END
 414 
 415 
 416 /*
 417  * Return the temporary directory that the VM uses for the attach
 418  * and perf data files.
 419  *
 420  * It is important that this directory is well-known and the
 421  * same for all VM instances. It cannot be affected by configuration
 422  * variables such as java.io.tmpdir.
 423  */
 424 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 425   JVMWrapper("JVM_GetTemporaryDirectory");
 426   HandleMark hm(THREAD);
 427   const char* temp_dir = os::get_temp_directory();
 428   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 429   return (jstring) JNIHandles::make_local(env, h());
 430 JVM_END
 431 
 432 
 433 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 434 
 435 extern volatile jint vm_created;
 436 
 437 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 438   before_exit(thread);
 439   vm_exit(code);
 440 JVM_END
 441 
 442 
 443 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 444   JVMWrapper("JVM_GC");
 445   if (!DisableExplicitGC) {
 446     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 447   }
 448 JVM_END
 449 
 450 
 451 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 452   JVMWrapper("JVM_MaxObjectInspectionAge");
 453   return Universe::heap()->millis_since_last_gc();
 454 JVM_END
 455 
 456 
 457 static inline jlong convert_size_t_to_jlong(size_t val) {
 458   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 459   NOT_LP64 (return (jlong)val;)
 460   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 461 }
 462 
 463 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 464   JVMWrapper("JVM_TotalMemory");
 465   size_t n = Universe::heap()->capacity();
 466   return convert_size_t_to_jlong(n);
 467 JVM_END
 468 
 469 
 470 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 471   JVMWrapper("JVM_FreeMemory");
 472   CollectedHeap* ch = Universe::heap();
 473   size_t n;
 474   {
 475      MutexLocker x(Heap_lock);
 476      n = ch->capacity() - ch->used();
 477   }
 478   return convert_size_t_to_jlong(n);
 479 JVM_END
 480 
 481 
 482 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 483   JVMWrapper("JVM_MaxMemory");
 484   size_t n = Universe::heap()->max_capacity();
 485   return convert_size_t_to_jlong(n);
 486 JVM_END
 487 
 488 
 489 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 490   JVMWrapper("JVM_ActiveProcessorCount");
 491   return os::active_processor_count();
 492 JVM_END
 493 
 494 
 495 
 496 // java.lang.Throwable //////////////////////////////////////////////////////
 497 
 498 
 499 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 500   JVMWrapper("JVM_FillInStackTrace");
 501   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 502   java_lang_Throwable::fill_in_stack_trace(exception);
 503 JVM_END
 504 
 505 
 506 // java.lang.StackTraceElement //////////////////////////////////////////////
 507 
 508 
 509 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
 510   JVMWrapper("JVM_InitStackTraceElementArray");
 511   Handle exception(THREAD, JNIHandles::resolve(throwable));
 512   objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
 513   objArrayHandle stack_trace(THREAD, st);
 514   // Fill in the allocated stack trace
 515   java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
 516 JVM_END
 517 
 518 
 519 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 520   JVMWrapper("JVM_InitStackTraceElement");
 521   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 522   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 523   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
 524 JVM_END
 525 
 526 
 527 // java.lang.StackWalker //////////////////////////////////////////////////////
 528 
 529 
 530 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
 531                                      jint skip_frames, jint frame_count, jint start_index,
 532                                      jobjectArray frames))
 533   JVMWrapper("JVM_CallStackWalk");
 534   JavaThread* jt = (JavaThread*) THREAD;
 535   if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
 536     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
 537   }
 538 
 539   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 540 
 541   // frames array is a Class<?>[] array when only getting caller reference,
 542   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 543   // be null.
 544   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 545   objArrayHandle frames_array_h(THREAD, fa);
 546 
 547   int limit = start_index + frame_count;
 548   if (frames_array_h->length() < limit) {
 549     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
 550   }
 551 
 552   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
 553                                start_index, frames_array_h, CHECK_NULL);
 554   return JNIHandles::make_local(env, result);
 555 JVM_END
 556 
 557 
 558 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
 559                                   jint frame_count, jint start_index,
 560                                   jobjectArray frames))
 561   JVMWrapper("JVM_MoreStackWalk");
 562   JavaThread* jt = (JavaThread*) THREAD;
 563 
 564   // frames array is a Class<?>[] array when only getting caller reference,
 565   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 566   // be null.
 567   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 568   objArrayHandle frames_array_h(THREAD, fa);
 569 
 570   int limit = start_index+frame_count;
 571   if (frames_array_h->length() < limit) {
 572     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 573   }
 574 
 575   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 576   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
 577                                    start_index, frames_array_h, THREAD);
 578 JVM_END
 579 
 580 // java.lang.Object ///////////////////////////////////////////////
 581 
 582 
 583 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 584   JVMWrapper("JVM_IHashCode");
 585   // as implemented in the classic virtual machine; return 0 if object is NULL
 586   return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
 587 JVM_END
 588 
 589 
 590 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 591   JVMWrapper("JVM_MonitorWait");
 592   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 593   JavaThreadInObjectWaitState jtiows(thread, ms != 0);
 594   if (JvmtiExport::should_post_monitor_wait()) {
 595     JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
 596 
 597     // The current thread already owns the monitor and it has not yet
 598     // been added to the wait queue so the current thread cannot be
 599     // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
 600     // event handler cannot accidentally consume an unpark() meant for
 601     // the ParkEvent associated with this ObjectMonitor.
 602   }
 603   ObjectSynchronizer::wait(obj, ms, CHECK);
 604 JVM_END
 605 
 606 
 607 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 608   JVMWrapper("JVM_MonitorNotify");
 609   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 610   ObjectSynchronizer::notify(obj, CHECK);
 611 JVM_END
 612 
 613 
 614 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 615   JVMWrapper("JVM_MonitorNotifyAll");
 616   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 617   ObjectSynchronizer::notifyall(obj, CHECK);
 618 JVM_END
 619 
 620 
 621 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 622   JVMWrapper("JVM_Clone");
 623   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 624   Klass* klass = obj->klass();
 625   JvmtiVMObjectAllocEventCollector oam;
 626 
 627 #ifdef ASSERT
 628   // Just checking that the cloneable flag is set correct
 629   if (obj->is_array()) {
 630     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 631   } else {
 632     guarantee(obj->is_instance(), "should be instanceOop");
 633     bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
 634     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 635   }
 636 #endif
 637 
 638   // Check if class of obj supports the Cloneable interface.
 639   // All arrays are considered to be cloneable (See JLS 20.1.5)
 640   if (!klass->is_cloneable()) {
 641     ResourceMark rm(THREAD);
 642     THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 643   }
 644 
 645   // Make shallow object copy
 646   const int size = obj->size();
 647   oop new_obj_oop = NULL;
 648   if (obj->is_array()) {
 649     const int length = ((arrayOop)obj())->length();
 650     new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
 651   } else {
 652     new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
 653   }
 654 
 655   // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
 656   // is modifying a reference field in the clonee, a non-oop-atomic copy might
 657   // be suspended in the middle of copying the pointer and end up with parts
 658   // of two different pointers in the field.  Subsequent dereferences will crash.
 659   // 4846409: an oop-copy of objects with long or double fields or arrays of same
 660   // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
 661   // of oops.  We know objects are aligned on a minimum of an jlong boundary.
 662   // The same is true of StubRoutines::object_copy and the various oop_copy
 663   // variants, and of the code generated by the inline_native_clone intrinsic.
 664   assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
 665   Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
 666                                (size_t)align_object_size(size) / HeapWordsPerLong);
 667   // Clear the header
 668   new_obj_oop->init_mark();
 669 
 670   // Store check (mark entire object and let gc sort it out)
 671   BarrierSet* bs = Universe::heap()->barrier_set();
 672   assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
 673   bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
 674 
 675   Handle new_obj(THREAD, new_obj_oop);
 676   // Special handling for MemberNames.  Since they contain Method* metadata, they
 677   // must be registered so that RedefineClasses can fix metadata contained in them.
 678   if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
 679       java_lang_invoke_MemberName::is_method(new_obj())) {
 680     Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
 681     // MemberName may be unresolved, so doesn't need registration until resolved.
 682     if (method != NULL) {
 683       methodHandle m(THREAD, method);
 684       // This can safepoint and redefine method, so need both new_obj and method
 685       // in a handle, for two different reasons.  new_obj can move, method can be
 686       // deleted if nothing is using it on the stack.
 687       m->method_holder()->add_member_name(new_obj, false);
 688     }
 689   }
 690 
 691   // Caution: this involves a java upcall, so the clone should be
 692   // "gc-robust" by this stage.
 693   if (klass->has_finalizer()) {
 694     assert(obj->is_instance(), "should be instanceOop");
 695     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 696     new_obj = Handle(THREAD, new_obj_oop);
 697   }
 698 
 699   return JNIHandles::make_local(env, new_obj());
 700 JVM_END
 701 
 702 // java.io.File ///////////////////////////////////////////////////////////////
 703 
 704 JVM_LEAF(char*, JVM_NativePath(char* path))
 705   JVMWrapper("JVM_NativePath");
 706   return os::native_path(path);
 707 JVM_END
 708 
 709 
 710 // Misc. class handling ///////////////////////////////////////////////////////////
 711 
 712 
 713 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
 714   JVMWrapper("JVM_GetCallerClass");
 715 
 716   // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
 717   // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
 718   // temporarily for existing code to use until a replacement API is defined.
 719   if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
 720     Klass* k = thread->security_get_caller_class(depth);
 721     return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
 722   }
 723 
 724   // Getting the class of the caller frame.
 725   //
 726   // The call stack at this point looks something like this:
 727   //
 728   // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
 729   // [1] [ @CallerSensitive API.method                                   ]
 730   // [.] [ (skipped intermediate frames)                                 ]
 731   // [n] [ caller                                                        ]
 732   vframeStream vfst(thread);
 733   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 734   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 735     Method* m = vfst.method();
 736     assert(m != NULL, "sanity");
 737     switch (n) {
 738     case 0:
 739       // This must only be called from Reflection.getCallerClass
 740       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 741         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 742       }
 743       // fall-through
 744     case 1:
 745       // Frame 0 and 1 must be caller sensitive.
 746       if (!m->caller_sensitive()) {
 747         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 748       }
 749       break;
 750     default:
 751       if (!m->is_ignored_by_security_stack_walk()) {
 752         // We have reached the desired frame; return the holder class.
 753         return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
 754       }
 755       break;
 756     }
 757   }
 758   return NULL;
 759 JVM_END
 760 
 761 
 762 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 763   JVMWrapper("JVM_FindPrimitiveClass");
 764   oop mirror = NULL;
 765   BasicType t = name2type(utf);
 766   if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
 767     mirror = Universe::java_mirror(t);
 768   }
 769   if (mirror == NULL) {
 770     THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 771   } else {
 772     return (jclass) JNIHandles::make_local(env, mirror);
 773   }
 774 JVM_END
 775 
 776 
 777 // Returns a class loaded by the bootstrap class loader; or null
 778 // if not found.  ClassNotFoundException is not thrown.
 779 // FindClassFromBootLoader is exported to the launcher for windows.
 780 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 781                                               const char* name))
 782   JVMWrapper("JVM_FindClassFromBootLoader");
 783 
 784   // Java libraries should ensure that name is never null...
 785   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 786     // It's impossible to create this class;  the name cannot fit
 787     // into the constant pool.
 788     return NULL;
 789   }
 790 
 791   TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
 792   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 793   if (k == NULL) {
 794     return NULL;
 795   }
 796 
 797   if (log_is_enabled(Debug, class, resolve)) {
 798     trace_class_resolution(k);
 799   }
 800   return (jclass) JNIHandles::make_local(env, k->java_mirror());
 801 JVM_END
 802 
 803 // Find a class with this name in this loader, using the caller's protection domain.
 804 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
 805                                           jboolean init, jobject loader,
 806                                           jclass caller))
 807   JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
 808   // Java libraries should ensure that name is never null...
 809   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 810     // It's impossible to create this class;  the name cannot fit
 811     // into the constant pool.
 812     THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
 813   }
 814 
 815   TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
 816 
 817   oop loader_oop = JNIHandles::resolve(loader);
 818   oop from_class = JNIHandles::resolve(caller);
 819   oop protection_domain = NULL;
 820   // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
 821   // NPE. Put it in another way, the bootstrap class loader has all permission and
 822   // thus no checkPackageAccess equivalence in the VM class loader.
 823   // The caller is also passed as NULL by the java code if there is no security
 824   // manager to avoid the performance cost of getting the calling class.
 825   if (from_class != NULL && loader_oop != NULL) {
 826     protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
 827   }
 828 
 829   Handle h_loader(THREAD, loader_oop);
 830   Handle h_prot(THREAD, protection_domain);
 831   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 832                                                h_prot, false, THREAD);
 833 
 834   if (log_is_enabled(Debug, class, resolve) && result != NULL) {
 835     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 836   }
 837   return result;
 838 JVM_END
 839 
 840 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 841                                          jboolean init, jclass from))
 842   JVMWrapper("JVM_FindClassFromClass");
 843   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 844     // It's impossible to create this class;  the name cannot fit
 845     // into the constant pool.
 846     THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
 847   }
 848   TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
 849   oop from_class_oop = JNIHandles::resolve(from);
 850   Klass* from_class = (from_class_oop == NULL)
 851                            ? (Klass*)NULL
 852                            : java_lang_Class::as_Klass(from_class_oop);
 853   oop class_loader = NULL;
 854   oop protection_domain = NULL;
 855   if (from_class != NULL) {
 856     class_loader = from_class->class_loader();
 857     protection_domain = from_class->protection_domain();
 858   }
 859   Handle h_loader(THREAD, class_loader);
 860   Handle h_prot  (THREAD, protection_domain);
 861   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 862                                                h_prot, true, thread);
 863 
 864   if (log_is_enabled(Debug, class, resolve) && result != NULL) {
 865     // this function is generally only used for class loading during verification.
 866     ResourceMark rm;
 867     oop from_mirror = JNIHandles::resolve_non_null(from);
 868     Klass* from_class = java_lang_Class::as_Klass(from_mirror);
 869     const char * from_name = from_class->external_name();
 870 
 871     oop mirror = JNIHandles::resolve_non_null(result);
 872     Klass* to_class = java_lang_Class::as_Klass(mirror);
 873     const char * to = to_class->external_name();
 874     log_debug(class, resolve)("%s %s (verification)", from_name, to);
 875   }
 876 
 877   return result;
 878 JVM_END
 879 
 880 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
 881   if (loader.is_null()) {
 882     return;
 883   }
 884 
 885   // check whether the current caller thread holds the lock or not.
 886   // If not, increment the corresponding counter
 887   if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
 888       ObjectSynchronizer::owner_self) {
 889     counter->inc();
 890   }
 891 }
 892 
 893 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
 894 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
 895                                       jobject loader, const jbyte *buf,
 896                                       jsize len, jobject pd, const char *source,
 897                                       TRAPS) {
 898   if (source == NULL)  source = "__JVM_DefineClass__";
 899 
 900   assert(THREAD->is_Java_thread(), "must be a JavaThread");
 901   JavaThread* jt = (JavaThread*) THREAD;
 902 
 903   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
 904                              ClassLoader::perf_define_appclass_selftime(),
 905                              ClassLoader::perf_define_appclasses(),
 906                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 907                              jt->get_thread_stat()->perf_timers_addr(),
 908                              PerfClassTraceTime::DEFINE_CLASS);
 909 
 910   if (UsePerfData) {
 911     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
 912   }
 913 
 914   // Since exceptions can be thrown, class initialization can take place
 915   // if name is NULL no check for class name in .class stream has to be made.
 916   TempNewSymbol class_name = NULL;
 917   if (name != NULL) {
 918     const int str_len = (int)strlen(name);
 919     if (str_len > Symbol::max_length()) {
 920       // It's impossible to create this class;  the name cannot fit
 921       // into the constant pool.
 922       THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
 923     }
 924     class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
 925   }
 926 
 927   ResourceMark rm(THREAD);
 928   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
 929   Handle class_loader (THREAD, JNIHandles::resolve(loader));
 930   if (UsePerfData) {
 931     is_lock_held_by_thread(class_loader,
 932                            ClassLoader::sync_JVMDefineClassLockFreeCounter(),
 933                            THREAD);
 934   }
 935   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
 936   Klass* k = SystemDictionary::resolve_from_stream(class_name,
 937                                                    class_loader,
 938                                                    protection_domain,
 939                                                    &st,
 940                                                    CHECK_NULL);
 941 
 942   if (log_is_enabled(Debug, class, resolve) && k != NULL) {
 943     trace_class_resolution(k);
 944   }
 945 
 946   return (jclass) JNIHandles::make_local(env, k->java_mirror());
 947 }
 948 
 949 
 950 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
 951   JVMWrapper("JVM_DefineClass");
 952 
 953   return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
 954 JVM_END
 955 
 956 
 957 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
 958   JVMWrapper("JVM_DefineClassWithSource");
 959 
 960   return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
 961 JVM_END
 962 
 963 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
 964   JVMWrapper("JVM_FindLoadedClass");
 965   ResourceMark rm(THREAD);
 966 
 967   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
 968   Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
 969 
 970   const char* str   = java_lang_String::as_utf8_string(string());
 971   // Sanity check, don't expect null
 972   if (str == NULL) return NULL;
 973 
 974   const int str_len = (int)strlen(str);
 975   if (str_len > Symbol::max_length()) {
 976     // It's impossible to create this class;  the name cannot fit
 977     // into the constant pool.
 978     return NULL;
 979   }
 980   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
 981 
 982   // Security Note:
 983   //   The Java level wrapper will perform the necessary security check allowing
 984   //   us to pass the NULL as the initiating class loader.
 985   Handle h_loader(THREAD, JNIHandles::resolve(loader));
 986   if (UsePerfData) {
 987     is_lock_held_by_thread(h_loader,
 988                            ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
 989                            THREAD);
 990   }
 991 
 992   Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
 993                                                               h_loader,
 994                                                               Handle(),
 995                                                               CHECK_NULL);
 996 #if INCLUDE_CDS
 997   if (k == NULL) {
 998     // If the class is not already loaded, try to see if it's in the shared
 999     // archive for the current classloader (h_loader).
1000     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1001   }
1002 #endif
1003   return (k == NULL) ? NULL :
1004             (jclass) JNIHandles::make_local(env, k->java_mirror());
1005 JVM_END
1006 
1007 // Module support //////////////////////////////////////////////////////////////////////////////
1008 
1009 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1010                                  jstring location, const char* const* packages, jsize num_packages))
1011   JVMWrapper("JVM_DefineModule");
1012   Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1013 JVM_END
1014 
1015 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1016   JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1017   Modules::set_bootloader_unnamed_module(module, CHECK);
1018 JVM_END
1019 
1020 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1021   JVMWrapper("JVM_AddModuleExports");
1022   Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1023 JVM_END
1024 
1025 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1026   JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1027   Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1028 JVM_END
1029 
1030 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1031   JVMWrapper("JVM_AddModuleExportsToAll");
1032   Modules::add_module_exports(from_module, package, NULL, CHECK);
1033 JVM_END
1034 
1035 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1036   JVMWrapper("JVM_AddReadsModule");
1037   Modules::add_reads_module(from_module, source_module, CHECK);
1038 JVM_END
1039 
1040 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, const char* package))
1041   JVMWrapper("JVM_AddModulePackage");
1042   Modules::add_module_package(module, package, CHECK);
1043 JVM_END
1044 
1045 // Reflection support //////////////////////////////////////////////////////////////////////////////
1046 
1047 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1048   assert (cls != NULL, "illegal class");
1049   JVMWrapper("JVM_GetClassName");
1050   JvmtiVMObjectAllocEventCollector oam;
1051   ResourceMark rm(THREAD);
1052   const char* name;
1053   if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1054     name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1055   } else {
1056     // Consider caching interned string in Klass
1057     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1058     assert(k->is_klass(), "just checking");
1059     name = k->external_name();
1060   }
1061   oop result = StringTable::intern((char*) name, CHECK_NULL);
1062   return (jstring) JNIHandles::make_local(env, result);
1063 JVM_END
1064 
1065 
1066 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1067   JVMWrapper("JVM_GetClassInterfaces");
1068   JvmtiVMObjectAllocEventCollector oam;
1069   oop mirror = JNIHandles::resolve_non_null(cls);
1070 
1071   // Special handling for primitive objects
1072   if (java_lang_Class::is_primitive(mirror)) {
1073     // Primitive objects does not have any interfaces
1074     objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1075     return (jobjectArray) JNIHandles::make_local(env, r);
1076   }
1077 
1078   Klass* klass = java_lang_Class::as_Klass(mirror);
1079   // Figure size of result array
1080   int size;
1081   if (klass->is_instance_klass()) {
1082     size = InstanceKlass::cast(klass)->local_interfaces()->length();
1083   } else {
1084     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1085     size = 2;
1086   }
1087 
1088   // Allocate result array
1089   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1090   objArrayHandle result (THREAD, r);
1091   // Fill in result
1092   if (klass->is_instance_klass()) {
1093     // Regular instance klass, fill in all local interfaces
1094     for (int index = 0; index < size; index++) {
1095       Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1096       result->obj_at_put(index, k->java_mirror());
1097     }
1098   } else {
1099     // All arrays implement java.lang.Cloneable and java.io.Serializable
1100     result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1101     result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1102   }
1103   return (jobjectArray) JNIHandles::make_local(env, result());
1104 JVM_END
1105 
1106 
1107 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1108   JVMWrapper("JVM_IsInterface");
1109   oop mirror = JNIHandles::resolve_non_null(cls);
1110   if (java_lang_Class::is_primitive(mirror)) {
1111     return JNI_FALSE;
1112   }
1113   Klass* k = java_lang_Class::as_Klass(mirror);
1114   jboolean result = k->is_interface();
1115   assert(!result || k->is_instance_klass(),
1116          "all interfaces are instance types");
1117   // The compiler intrinsic for isInterface tests the
1118   // Klass::_access_flags bits in the same way.
1119   return result;
1120 JVM_END
1121 
1122 
1123 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1124   JVMWrapper("JVM_GetClassSigners");
1125   JvmtiVMObjectAllocEventCollector oam;
1126   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1127     // There are no signers for primitive types
1128     return NULL;
1129   }
1130 
1131   objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1132 
1133   // If there are no signers set in the class, or if the class
1134   // is an array, return NULL.
1135   if (signers == NULL) return NULL;
1136 
1137   // copy of the signers array
1138   Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1139   objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1140   for (int index = 0; index < signers->length(); index++) {
1141     signers_copy->obj_at_put(index, signers->obj_at(index));
1142   }
1143 
1144   // return the copy
1145   return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1146 JVM_END
1147 
1148 
1149 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1150   JVMWrapper("JVM_SetClassSigners");
1151   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1152     // This call is ignored for primitive types and arrays.
1153     // Signers are only set once, ClassLoader.java, and thus shouldn't
1154     // be called with an array.  Only the bootstrap loader creates arrays.
1155     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1156     if (k->is_instance_klass()) {
1157       java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1158     }
1159   }
1160 JVM_END
1161 
1162 
1163 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1164   JVMWrapper("JVM_GetProtectionDomain");
1165   if (JNIHandles::resolve(cls) == NULL) {
1166     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1167   }
1168 
1169   if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1170     // Primitive types does not have a protection domain.
1171     return NULL;
1172   }
1173 
1174   oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1175   return (jobject) JNIHandles::make_local(env, pd);
1176 JVM_END
1177 
1178 
1179 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1180   // If there is a security manager and protection domain, check the access
1181   // in the protection domain, otherwise it is authorized.
1182   if (java_lang_System::has_security_manager()) {
1183 
1184     // For bootstrapping, if pd implies method isn't in the JDK, allow
1185     // this context to revert to older behavior.
1186     // In this case the isAuthorized field in AccessControlContext is also not
1187     // present.
1188     if (Universe::protection_domain_implies_method() == NULL) {
1189       return true;
1190     }
1191 
1192     // Whitelist certain access control contexts
1193     if (java_security_AccessControlContext::is_authorized(context)) {
1194       return true;
1195     }
1196 
1197     oop prot = klass->protection_domain();
1198     if (prot != NULL) {
1199       // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1200       // in the new wrapper.
1201       methodHandle m(THREAD, Universe::protection_domain_implies_method());
1202       Handle h_prot(THREAD, prot);
1203       JavaValue result(T_BOOLEAN);
1204       JavaCallArguments args(h_prot);
1205       JavaCalls::call(&result, m, &args, CHECK_false);
1206       return (result.get_jboolean() != 0);
1207     }
1208   }
1209   return true;
1210 }
1211 
1212 // Create an AccessControlContext with a protection domain with null codesource
1213 // and null permissions - which gives no permissions.
1214 oop create_dummy_access_control_context(TRAPS) {
1215   InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1216   Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1217   // Call constructor ProtectionDomain(null, null);
1218   JavaValue result(T_VOID);
1219   JavaCalls::call_special(&result, obj, pd_klass,
1220                           vmSymbols::object_initializer_name(),
1221                           vmSymbols::codesource_permissioncollection_signature(),
1222                           Handle(), Handle(), CHECK_NULL);
1223 
1224   // new ProtectionDomain[] {pd};
1225   objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1226   context->obj_at_put(0, obj());
1227 
1228   // new AccessControlContext(new ProtectionDomain[] {pd})
1229   objArrayHandle h_context(THREAD, context);
1230   oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1231   return acc;
1232 }
1233 
1234 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1235   JVMWrapper("JVM_DoPrivileged");
1236 
1237   if (action == NULL) {
1238     THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1239   }
1240 
1241   // Compute the frame initiating the do privileged operation and setup the privileged stack
1242   vframeStream vfst(thread);
1243   vfst.security_get_caller_frame(1);
1244 
1245   if (vfst.at_end()) {
1246     THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1247   }
1248 
1249   Method* method        = vfst.method();
1250   InstanceKlass* klass  = method->method_holder();
1251 
1252   // Check that action object understands "Object run()"
1253   Handle h_context;
1254   if (context != NULL) {
1255     h_context = Handle(THREAD, JNIHandles::resolve(context));
1256     bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1257     if (!authorized) {
1258       // Create an unprivileged access control object and call it's run function
1259       // instead.
1260       oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1261       h_context = Handle(THREAD, noprivs);
1262     }
1263   }
1264 
1265   // Check that action object understands "Object run()"
1266   Handle object (THREAD, JNIHandles::resolve(action));
1267 
1268   // get run() method
1269   Method* m_oop = object->klass()->uncached_lookup_method(
1270                                            vmSymbols::run_method_name(),
1271                                            vmSymbols::void_object_signature(),
1272                                            Klass::find_overpass);
1273   methodHandle m (THREAD, m_oop);
1274   if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1275     THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1276   }
1277 
1278   // Stack allocated list of privileged stack elements
1279   PrivilegedElement pi;
1280   if (!vfst.at_end()) {
1281     pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1282     thread->set_privileged_stack_top(&pi);
1283   }
1284 
1285 
1286   // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1287   // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1288   Handle pending_exception;
1289   JavaValue result(T_OBJECT);
1290   JavaCallArguments args(object);
1291   JavaCalls::call(&result, m, &args, THREAD);
1292 
1293   // done with action, remove ourselves from the list
1294   if (!vfst.at_end()) {
1295     assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1296     thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1297   }
1298 
1299   if (HAS_PENDING_EXCEPTION) {
1300     pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1301     CLEAR_PENDING_EXCEPTION;
1302     // JVMTI has already reported the pending exception
1303     // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1304     if (THREAD->is_Java_thread()) {
1305       JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1306     }
1307     if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1308         !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1309       // Throw a java.security.PrivilegedActionException(Exception e) exception
1310       JavaCallArguments args(pending_exception);
1311       THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1312                   vmSymbols::exception_void_signature(),
1313                   &args);
1314     }
1315   }
1316 
1317   if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1318   return JNIHandles::make_local(env, (oop) result.get_jobject());
1319 JVM_END
1320 
1321 
1322 // Returns the inherited_access_control_context field of the running thread.
1323 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1324   JVMWrapper("JVM_GetInheritedAccessControlContext");
1325   oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1326   return JNIHandles::make_local(env, result);
1327 JVM_END
1328 
1329 class RegisterArrayForGC {
1330  private:
1331   JavaThread *_thread;
1332  public:
1333   RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array)  {
1334     _thread = thread;
1335     _thread->register_array_for_gc(array);
1336   }
1337 
1338   ~RegisterArrayForGC() {
1339     _thread->register_array_for_gc(NULL);
1340   }
1341 };
1342 
1343 
1344 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1345   JVMWrapper("JVM_GetStackAccessControlContext");
1346   if (!UsePrivilegedStack) return NULL;
1347 
1348   ResourceMark rm(THREAD);
1349   GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1350   JvmtiVMObjectAllocEventCollector oam;
1351 
1352   // count the protection domains on the execution stack. We collapse
1353   // duplicate consecutive protection domains into a single one, as
1354   // well as stopping when we hit a privileged frame.
1355 
1356   // Use vframeStream to iterate through Java frames
1357   vframeStream vfst(thread);
1358 
1359   oop previous_protection_domain = NULL;
1360   Handle privileged_context(thread, NULL);
1361   bool is_privileged = false;
1362   oop protection_domain = NULL;
1363 
1364   for(; !vfst.at_end(); vfst.next()) {
1365     // get method of frame
1366     Method* method = vfst.method();
1367     intptr_t* frame_id   = vfst.frame_id();
1368 
1369     // check the privileged frames to see if we have a match
1370     if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1371       // this frame is privileged
1372       is_privileged = true;
1373       privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1374       protection_domain  = thread->privileged_stack_top()->protection_domain();
1375     } else {
1376       protection_domain = method->method_holder()->protection_domain();
1377     }
1378 
1379     if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1380       local_array->push(protection_domain);
1381       previous_protection_domain = protection_domain;
1382     }
1383 
1384     if (is_privileged) break;
1385   }
1386 
1387 
1388   // either all the domains on the stack were system domains, or
1389   // we had a privileged system domain
1390   if (local_array->is_empty()) {
1391     if (is_privileged && privileged_context.is_null()) return NULL;
1392 
1393     oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1394     return JNIHandles::make_local(env, result);
1395   }
1396 
1397   // the resource area must be registered in case of a gc
1398   RegisterArrayForGC ragc(thread, local_array);
1399   objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1400                                                  local_array->length(), CHECK_NULL);
1401   objArrayHandle h_context(thread, context);
1402   for (int index = 0; index < local_array->length(); index++) {
1403     h_context->obj_at_put(index, local_array->at(index));
1404   }
1405 
1406   oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1407 
1408   return JNIHandles::make_local(env, result);
1409 JVM_END
1410 
1411 
1412 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1413   JVMWrapper("JVM_IsArrayClass");
1414   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1415   return (k != NULL) && k->is_array_klass() ? true : false;
1416 JVM_END
1417 
1418 
1419 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1420   JVMWrapper("JVM_IsPrimitiveClass");
1421   oop mirror = JNIHandles::resolve_non_null(cls);
1422   return (jboolean) java_lang_Class::is_primitive(mirror);
1423 JVM_END
1424 
1425 
1426 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1427   JVMWrapper("JVM_GetClassModifiers");
1428   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1429     // Primitive type
1430     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1431   }
1432 
1433   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1434   debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1435   assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1436   return k->modifier_flags();
1437 JVM_END
1438 
1439 
1440 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1441 
1442 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1443   JvmtiVMObjectAllocEventCollector oam;
1444   // ofClass is a reference to a java_lang_Class object. The mirror object
1445   // of an InstanceKlass
1446 
1447   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1448       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1449     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1450     return (jobjectArray)JNIHandles::make_local(env, result);
1451   }
1452 
1453   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1454   InnerClassesIterator iter(k);
1455 
1456   if (iter.length() == 0) {
1457     // Neither an inner nor outer class
1458     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1459     return (jobjectArray)JNIHandles::make_local(env, result);
1460   }
1461 
1462   // find inner class info
1463   constantPoolHandle cp(thread, k->constants());
1464   int length = iter.length();
1465 
1466   // Allocate temp. result array
1467   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1468   objArrayHandle result (THREAD, r);
1469   int members = 0;
1470 
1471   for (; !iter.done(); iter.next()) {
1472     int ioff = iter.inner_class_info_index();
1473     int ooff = iter.outer_class_info_index();
1474 
1475     if (ioff != 0 && ooff != 0) {
1476       // Check to see if the name matches the class we're looking for
1477       // before attempting to find the class.
1478       if (cp->klass_name_at_matches(k, ooff)) {
1479         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1480         if (outer_klass == k) {
1481            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1482            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1483 
1484            // Throws an exception if outer klass has not declared k as
1485            // an inner klass
1486            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1487 
1488            result->obj_at_put(members, inner_klass->java_mirror());
1489            members++;
1490         }
1491       }
1492     }
1493   }
1494 
1495   if (members != length) {
1496     // Return array of right length
1497     objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1498     for(int i = 0; i < members; i++) {
1499       res->obj_at_put(i, result->obj_at(i));
1500     }
1501     return (jobjectArray)JNIHandles::make_local(env, res);
1502   }
1503 
1504   return (jobjectArray)JNIHandles::make_local(env, result());
1505 JVM_END
1506 
1507 
1508 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1509 {
1510   // ofClass is a reference to a java_lang_Class object.
1511   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1512       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1513     return NULL;
1514   }
1515 
1516   bool inner_is_member = false;
1517   Klass* outer_klass
1518     = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1519                           )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1520   if (outer_klass == NULL)  return NULL;  // already a top-level class
1521   if (!inner_is_member)  return NULL;     // an anonymous class (inside a method)
1522   return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1523 }
1524 JVM_END
1525 
1526 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1527 {
1528   oop mirror = JNIHandles::resolve_non_null(cls);
1529   if (java_lang_Class::is_primitive(mirror) ||
1530       !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1531     return NULL;
1532   }
1533   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1534   int ooff = 0, noff = 0;
1535   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1536     if (noff != 0) {
1537       constantPoolHandle i_cp(thread, k->constants());
1538       Symbol* name = i_cp->symbol_at(noff);
1539       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1540       return (jstring) JNIHandles::make_local(env, str());
1541     }
1542   }
1543   return NULL;
1544 }
1545 JVM_END
1546 
1547 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1548   assert (cls != NULL, "illegal class");
1549   JVMWrapper("JVM_GetClassSignature");
1550   JvmtiVMObjectAllocEventCollector oam;
1551   ResourceMark rm(THREAD);
1552   // Return null for arrays and primatives
1553   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1554     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1555     if (k->is_instance_klass()) {
1556       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1557       if (sym == NULL) return NULL;
1558       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1559       return (jstring) JNIHandles::make_local(env, str());
1560     }
1561   }
1562   return NULL;
1563 JVM_END
1564 
1565 
1566 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1567   assert (cls != NULL, "illegal class");
1568   JVMWrapper("JVM_GetClassAnnotations");
1569 
1570   // Return null for arrays and primitives
1571   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1572     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1573     if (k->is_instance_klass()) {
1574       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1575       return (jbyteArray) JNIHandles::make_local(env, a);
1576     }
1577   }
1578   return NULL;
1579 JVM_END
1580 
1581 
1582 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1583   // some of this code was adapted from from jni_FromReflectedField
1584 
1585   oop reflected = JNIHandles::resolve_non_null(field);
1586   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1587   Klass* k    = java_lang_Class::as_Klass(mirror);
1588   int slot      = java_lang_reflect_Field::slot(reflected);
1589   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1590 
1591   InstanceKlass* ik = InstanceKlass::cast(k);
1592   intptr_t offset = ik->field_offset(slot);
1593 
1594   if (modifiers & JVM_ACC_STATIC) {
1595     // for static fields we only look in the current class
1596     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1597       assert(false, "cannot find static field");
1598       return false;
1599     }
1600   } else {
1601     // for instance fields we start with the current class and work
1602     // our way up through the superclass chain
1603     if (!ik->find_field_from_offset(offset, false, &fd)) {
1604       assert(false, "cannot find instance field");
1605       return false;
1606     }
1607   }
1608   return true;
1609 }
1610 
1611 static Method* jvm_get_method_common(jobject method) {
1612   // some of this code was adapted from from jni_FromReflectedMethod
1613 
1614   oop reflected = JNIHandles::resolve_non_null(method);
1615   oop mirror    = NULL;
1616   int slot      = 0;
1617 
1618   if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1619     mirror = java_lang_reflect_Constructor::clazz(reflected);
1620     slot   = java_lang_reflect_Constructor::slot(reflected);
1621   } else {
1622     assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1623            "wrong type");
1624     mirror = java_lang_reflect_Method::clazz(reflected);
1625     slot   = java_lang_reflect_Method::slot(reflected);
1626   }
1627   Klass* k = java_lang_Class::as_Klass(mirror);
1628 
1629   Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1630   assert(m != NULL, "cannot find method");
1631   return m;  // caller has to deal with NULL in product mode
1632 }
1633 
1634 /* Type use annotations support (JDK 1.8) */
1635 
1636 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1637   assert (cls != NULL, "illegal class");
1638   JVMWrapper("JVM_GetClassTypeAnnotations");
1639   ResourceMark rm(THREAD);
1640   // Return null for arrays and primitives
1641   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1642     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1643     if (k->is_instance_klass()) {
1644       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1645       if (type_annotations != NULL) {
1646         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1647         return (jbyteArray) JNIHandles::make_local(env, a);
1648       }
1649     }
1650   }
1651   return NULL;
1652 JVM_END
1653 
1654 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1655   assert (method != NULL, "illegal method");
1656   JVMWrapper("JVM_GetMethodTypeAnnotations");
1657 
1658   // method is a handle to a java.lang.reflect.Method object
1659   Method* m = jvm_get_method_common(method);
1660   if (m == NULL) {
1661     return NULL;
1662   }
1663 
1664   AnnotationArray* type_annotations = m->type_annotations();
1665   if (type_annotations != NULL) {
1666     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1667     return (jbyteArray) JNIHandles::make_local(env, a);
1668   }
1669 
1670   return NULL;
1671 JVM_END
1672 
1673 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1674   assert (field != NULL, "illegal field");
1675   JVMWrapper("JVM_GetFieldTypeAnnotations");
1676 
1677   fieldDescriptor fd;
1678   bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1679   if (!gotFd) {
1680     return NULL;
1681   }
1682 
1683   return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1684 JVM_END
1685 
1686 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1687   if (!cp->is_within_bounds(index)) {
1688     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1689   }
1690 }
1691 
1692 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1693 {
1694   JVMWrapper("JVM_GetMethodParameters");
1695   // method is a handle to a java.lang.reflect.Method object
1696   Method* method_ptr = jvm_get_method_common(method);
1697   methodHandle mh (THREAD, method_ptr);
1698   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1699   const int num_params = mh->method_parameters_length();
1700 
1701   if (num_params < 0) {
1702     // A -1 return value from method_parameters_length means there is no
1703     // parameter data.  Return null to indicate this to the reflection
1704     // API.
1705     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1706     return (jobjectArray)NULL;
1707   } else {
1708     // Otherwise, we return something up to reflection, even if it is
1709     // a zero-length array.  Why?  Because in some cases this can
1710     // trigger a MalformedParametersException.
1711 
1712     // make sure all the symbols are properly formatted
1713     for (int i = 0; i < num_params; i++) {
1714       MethodParametersElement* params = mh->method_parameters_start();
1715       int index = params[i].name_cp_index;
1716       bounds_check(mh->constants(), index, CHECK_NULL);
1717 
1718       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1719         THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1720                     "Wrong type at constant pool index");
1721       }
1722 
1723     }
1724 
1725     objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1726     objArrayHandle result (THREAD, result_oop);
1727 
1728     for (int i = 0; i < num_params; i++) {
1729       MethodParametersElement* params = mh->method_parameters_start();
1730       // For a 0 index, give a NULL symbol
1731       Symbol* sym = 0 != params[i].name_cp_index ?
1732         mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1733       int flags = params[i].flags;
1734       oop param = Reflection::new_parameter(reflected_method, i, sym,
1735                                             flags, CHECK_NULL);
1736       result->obj_at_put(i, param);
1737     }
1738     return (jobjectArray)JNIHandles::make_local(env, result());
1739   }
1740 }
1741 JVM_END
1742 
1743 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1744 
1745 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1746 {
1747   JVMWrapper("JVM_GetClassDeclaredFields");
1748   JvmtiVMObjectAllocEventCollector oam;
1749 
1750   // Exclude primitive types and array types
1751   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1752       java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1753     // Return empty array
1754     oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1755     return (jobjectArray) JNIHandles::make_local(env, res);
1756   }
1757 
1758   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1759   constantPoolHandle cp(THREAD, k->constants());
1760 
1761   // Ensure class is linked
1762   k->link_class(CHECK_NULL);
1763 
1764   // Allocate result
1765   int num_fields;
1766 
1767   if (publicOnly) {
1768     num_fields = 0;
1769     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1770       if (fs.access_flags().is_public()) ++num_fields;
1771     }
1772   } else {
1773     num_fields = k->java_fields_count();
1774   }
1775 
1776   objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1777   objArrayHandle result (THREAD, r);
1778 
1779   int out_idx = 0;
1780   fieldDescriptor fd;
1781   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1782     if (!publicOnly || fs.access_flags().is_public()) {
1783       fd.reinitialize(k, fs.index());
1784       oop field = Reflection::new_field(&fd, CHECK_NULL);
1785       result->obj_at_put(out_idx, field);
1786       ++out_idx;
1787     }
1788   }
1789   assert(out_idx == num_fields, "just checking");
1790   return (jobjectArray) JNIHandles::make_local(env, result());
1791 }
1792 JVM_END
1793 
1794 static bool select_method(methodHandle method, bool want_constructor) {
1795   if (want_constructor) {
1796     return (method->is_initializer() && !method->is_static());
1797   } else {
1798     return  (!method->is_initializer() && !method->is_overpass());
1799   }
1800 }
1801 
1802 static jobjectArray get_class_declared_methods_helper(
1803                                   JNIEnv *env,
1804                                   jclass ofClass, jboolean publicOnly,
1805                                   bool want_constructor,
1806                                   Klass* klass, TRAPS) {
1807 
1808   JvmtiVMObjectAllocEventCollector oam;
1809 
1810   // Exclude primitive types and array types
1811   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1812       || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1813     // Return empty array
1814     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1815     return (jobjectArray) JNIHandles::make_local(env, res);
1816   }
1817 
1818   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1819 
1820   // Ensure class is linked
1821   k->link_class(CHECK_NULL);
1822 
1823   Array<Method*>* methods = k->methods();
1824   int methods_length = methods->length();
1825 
1826   // Save original method_idnum in case of redefinition, which can change
1827   // the idnum of obsolete methods.  The new method will have the same idnum
1828   // but if we refresh the methods array, the counts will be wrong.
1829   ResourceMark rm(THREAD);
1830   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1831   int num_methods = 0;
1832 
1833   for (int i = 0; i < methods_length; i++) {
1834     methodHandle method(THREAD, methods->at(i));
1835     if (select_method(method, want_constructor)) {
1836       if (!publicOnly || method->is_public()) {
1837         idnums->push(method->method_idnum());
1838         ++num_methods;
1839       }
1840     }
1841   }
1842 
1843   // Allocate result
1844   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1845   objArrayHandle result (THREAD, r);
1846 
1847   // Now just put the methods that we selected above, but go by their idnum
1848   // in case of redefinition.  The methods can be redefined at any safepoint,
1849   // so above when allocating the oop array and below when creating reflect
1850   // objects.
1851   for (int i = 0; i < num_methods; i++) {
1852     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1853     if (method.is_null()) {
1854       // Method may have been deleted and seems this API can handle null
1855       // Otherwise should probably put a method that throws NSME
1856       result->obj_at_put(i, NULL);
1857     } else {
1858       oop m;
1859       if (want_constructor) {
1860         m = Reflection::new_constructor(method, CHECK_NULL);
1861       } else {
1862         m = Reflection::new_method(method, false, CHECK_NULL);
1863       }
1864       result->obj_at_put(i, m);
1865     }
1866   }
1867 
1868   return (jobjectArray) JNIHandles::make_local(env, result());
1869 }
1870 
1871 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1872 {
1873   JVMWrapper("JVM_GetClassDeclaredMethods");
1874   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1875                                            /*want_constructor*/ false,
1876                                            SystemDictionary::reflect_Method_klass(), THREAD);
1877 }
1878 JVM_END
1879 
1880 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1881 {
1882   JVMWrapper("JVM_GetClassDeclaredConstructors");
1883   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1884                                            /*want_constructor*/ true,
1885                                            SystemDictionary::reflect_Constructor_klass(), THREAD);
1886 }
1887 JVM_END
1888 
1889 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1890 {
1891   JVMWrapper("JVM_GetClassAccessFlags");
1892   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1893     // Primitive type
1894     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1895   }
1896 
1897   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1898   return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1899 }
1900 JVM_END
1901 
1902 
1903 // Constant pool access //////////////////////////////////////////////////////////
1904 
1905 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1906 {
1907   JVMWrapper("JVM_GetClassConstantPool");
1908   JvmtiVMObjectAllocEventCollector oam;
1909 
1910   // Return null for primitives and arrays
1911   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1912     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1913     if (k->is_instance_klass()) {
1914       InstanceKlass* k_h = InstanceKlass::cast(k);
1915       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1916       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1917       return JNIHandles::make_local(jcp());
1918     }
1919   }
1920   return NULL;
1921 }
1922 JVM_END
1923 
1924 
1925 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1926 {
1927   JVMWrapper("JVM_ConstantPoolGetSize");
1928   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1929   return cp->length();
1930 }
1931 JVM_END
1932 
1933 
1934 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1935 {
1936   JVMWrapper("JVM_ConstantPoolGetClassAt");
1937   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1938   bounds_check(cp, index, CHECK_NULL);
1939   constantTag tag = cp->tag_at(index);
1940   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1941     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1942   }
1943   Klass* k = cp->klass_at(index, CHECK_NULL);
1944   return (jclass) JNIHandles::make_local(k->java_mirror());
1945 }
1946 JVM_END
1947 
1948 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1949 {
1950   JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1951   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1952   bounds_check(cp, index, CHECK_NULL);
1953   constantTag tag = cp->tag_at(index);
1954   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1955     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1956   }
1957   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1958   if (k == NULL) return NULL;
1959   return (jclass) JNIHandles::make_local(k->java_mirror());
1960 }
1961 JVM_END
1962 
1963 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1964   constantTag tag = cp->tag_at(index);
1965   if (!tag.is_method() && !tag.is_interface_method()) {
1966     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1967   }
1968   int klass_ref  = cp->uncached_klass_ref_index_at(index);
1969   Klass* k_o;
1970   if (force_resolution) {
1971     k_o = cp->klass_at(klass_ref, CHECK_NULL);
1972   } else {
1973     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1974     if (k_o == NULL) return NULL;
1975   }
1976   InstanceKlass* k = InstanceKlass::cast(k_o);
1977   Symbol* name = cp->uncached_name_ref_at(index);
1978   Symbol* sig  = cp->uncached_signature_ref_at(index);
1979   methodHandle m (THREAD, k->find_method(name, sig));
1980   if (m.is_null()) {
1981     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1982   }
1983   oop method;
1984   if (!m->is_initializer() || m->is_static()) {
1985     method = Reflection::new_method(m, true, CHECK_NULL);
1986   } else {
1987     method = Reflection::new_constructor(m, CHECK_NULL);
1988   }
1989   return JNIHandles::make_local(method);
1990 }
1991 
1992 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1993 {
1994   JVMWrapper("JVM_ConstantPoolGetMethodAt");
1995   JvmtiVMObjectAllocEventCollector oam;
1996   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1997   bounds_check(cp, index, CHECK_NULL);
1998   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1999   return res;
2000 }
2001 JVM_END
2002 
2003 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2004 {
2005   JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2006   JvmtiVMObjectAllocEventCollector oam;
2007   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2008   bounds_check(cp, index, CHECK_NULL);
2009   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2010   return res;
2011 }
2012 JVM_END
2013 
2014 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2015   constantTag tag = cp->tag_at(index);
2016   if (!tag.is_field()) {
2017     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2018   }
2019   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2020   Klass* k_o;
2021   if (force_resolution) {
2022     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2023   } else {
2024     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2025     if (k_o == NULL) return NULL;
2026   }
2027   InstanceKlass* k = InstanceKlass::cast(k_o);
2028   Symbol* name = cp->uncached_name_ref_at(index);
2029   Symbol* sig  = cp->uncached_signature_ref_at(index);
2030   fieldDescriptor fd;
2031   Klass* target_klass = k->find_field(name, sig, &fd);
2032   if (target_klass == NULL) {
2033     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2034   }
2035   oop field = Reflection::new_field(&fd, CHECK_NULL);
2036   return JNIHandles::make_local(field);
2037 }
2038 
2039 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2040 {
2041   JVMWrapper("JVM_ConstantPoolGetFieldAt");
2042   JvmtiVMObjectAllocEventCollector oam;
2043   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2044   bounds_check(cp, index, CHECK_NULL);
2045   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2046   return res;
2047 }
2048 JVM_END
2049 
2050 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2051 {
2052   JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2053   JvmtiVMObjectAllocEventCollector oam;
2054   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2055   bounds_check(cp, index, CHECK_NULL);
2056   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2057   return res;
2058 }
2059 JVM_END
2060 
2061 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2062 {
2063   JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2064   JvmtiVMObjectAllocEventCollector oam;
2065   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2066   bounds_check(cp, index, CHECK_NULL);
2067   constantTag tag = cp->tag_at(index);
2068   if (!tag.is_field_or_method()) {
2069     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2070   }
2071   int klass_ref = cp->uncached_klass_ref_index_at(index);
2072   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2073   Symbol*  member_name = cp->uncached_name_ref_at(index);
2074   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2075   objArrayOop  dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2076   objArrayHandle dest(THREAD, dest_o);
2077   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2078   dest->obj_at_put(0, str());
2079   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2080   dest->obj_at_put(1, str());
2081   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2082   dest->obj_at_put(2, str());
2083   return (jobjectArray) JNIHandles::make_local(dest());
2084 }
2085 JVM_END
2086 
2087 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2088 {
2089   JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2090   JvmtiVMObjectAllocEventCollector oam;
2091   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2092   bounds_check(cp, index, CHECK_0);
2093   constantTag tag = cp->tag_at(index);
2094   if (!tag.is_field_or_method()) {
2095     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2096   }
2097   return (jint) cp->uncached_klass_ref_index_at(index);
2098 }
2099 JVM_END
2100 
2101 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2102 {
2103   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2104   JvmtiVMObjectAllocEventCollector oam;
2105   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2106   bounds_check(cp, index, CHECK_0);
2107   constantTag tag = cp->tag_at(index);
2108   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2109     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2110   }
2111   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2112 }
2113 JVM_END
2114 
2115 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2116 {
2117   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2118   JvmtiVMObjectAllocEventCollector oam;
2119   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2120   bounds_check(cp, index, CHECK_NULL);
2121   constantTag tag = cp->tag_at(index);
2122   if (!tag.is_name_and_type()) {
2123     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2124   }
2125   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2126   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2127   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2128   objArrayHandle dest(THREAD, dest_o);
2129   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2130   dest->obj_at_put(0, str());
2131   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2132   dest->obj_at_put(1, str());
2133   return (jobjectArray) JNIHandles::make_local(dest());
2134 }
2135 JVM_END
2136 
2137 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2138 {
2139   JVMWrapper("JVM_ConstantPoolGetIntAt");
2140   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141   bounds_check(cp, index, CHECK_0);
2142   constantTag tag = cp->tag_at(index);
2143   if (!tag.is_int()) {
2144     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145   }
2146   return cp->int_at(index);
2147 }
2148 JVM_END
2149 
2150 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2151 {
2152   JVMWrapper("JVM_ConstantPoolGetLongAt");
2153   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154   bounds_check(cp, index, CHECK_(0L));
2155   constantTag tag = cp->tag_at(index);
2156   if (!tag.is_long()) {
2157     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158   }
2159   return cp->long_at(index);
2160 }
2161 JVM_END
2162 
2163 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2164 {
2165   JVMWrapper("JVM_ConstantPoolGetFloatAt");
2166   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2167   bounds_check(cp, index, CHECK_(0.0f));
2168   constantTag tag = cp->tag_at(index);
2169   if (!tag.is_float()) {
2170     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2171   }
2172   return cp->float_at(index);
2173 }
2174 JVM_END
2175 
2176 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2177 {
2178   JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2179   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2180   bounds_check(cp, index, CHECK_(0.0));
2181   constantTag tag = cp->tag_at(index);
2182   if (!tag.is_double()) {
2183     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2184   }
2185   return cp->double_at(index);
2186 }
2187 JVM_END
2188 
2189 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2190 {
2191   JVMWrapper("JVM_ConstantPoolGetStringAt");
2192   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2193   bounds_check(cp, index, CHECK_NULL);
2194   constantTag tag = cp->tag_at(index);
2195   if (!tag.is_string()) {
2196     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2197   }
2198   oop str = cp->string_at(index, CHECK_NULL);
2199   return (jstring) JNIHandles::make_local(str);
2200 }
2201 JVM_END
2202 
2203 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2204 {
2205   JVMWrapper("JVM_ConstantPoolGetUTF8At");
2206   JvmtiVMObjectAllocEventCollector oam;
2207   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2208   bounds_check(cp, index, CHECK_NULL);
2209   constantTag tag = cp->tag_at(index);
2210   if (!tag.is_symbol()) {
2211     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2212   }
2213   Symbol* sym = cp->symbol_at(index);
2214   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2215   return (jstring) JNIHandles::make_local(str());
2216 }
2217 JVM_END
2218 
2219 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2220 {
2221   JVMWrapper("JVM_ConstantPoolGetTagAt");
2222   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2223   bounds_check(cp, index, CHECK_0);
2224   constantTag tag = cp->tag_at(index);
2225   jbyte result = tag.value();
2226   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2227   // they are changed to the corresponding tags from the JVM spec, so that java code in
2228   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2229   if (tag.is_klass_or_reference()) {
2230       result = JVM_CONSTANT_Class;
2231   } else if (tag.is_string_index()) {
2232       result = JVM_CONSTANT_String;
2233   } else if (tag.is_method_type_in_error()) {
2234       result = JVM_CONSTANT_MethodType;
2235   } else if (tag.is_method_handle_in_error()) {
2236       result = JVM_CONSTANT_MethodHandle;
2237   }
2238   return result;
2239 }
2240 JVM_END
2241 
2242 // Assertion support. //////////////////////////////////////////////////////////
2243 
2244 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2245   JVMWrapper("JVM_DesiredAssertionStatus");
2246   assert(cls != NULL, "bad class");
2247 
2248   oop r = JNIHandles::resolve(cls);
2249   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2250   if (java_lang_Class::is_primitive(r)) return false;
2251 
2252   Klass* k = java_lang_Class::as_Klass(r);
2253   assert(k->is_instance_klass(), "must be an instance klass");
2254   if (!k->is_instance_klass()) return false;
2255 
2256   ResourceMark rm(THREAD);
2257   const char* name = k->name()->as_C_string();
2258   bool system_class = k->class_loader() == NULL;
2259   return JavaAssertions::enabled(name, system_class);
2260 
2261 JVM_END
2262 
2263 
2264 // Return a new AssertionStatusDirectives object with the fields filled in with
2265 // command-line assertion arguments (i.e., -ea, -da).
2266 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2267   JVMWrapper("JVM_AssertionStatusDirectives");
2268   JvmtiVMObjectAllocEventCollector oam;
2269   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2270   return JNIHandles::make_local(env, asd);
2271 JVM_END
2272 
2273 // Verification ////////////////////////////////////////////////////////////////////////////////
2274 
2275 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2276 
2277 // RedefineClasses support: bug 6214132 caused verification to fail.
2278 // All functions from this section should call the jvmtiThreadSate function:
2279 //   Klass* class_to_verify_considering_redefinition(Klass* klass).
2280 // The function returns a Klass* of the _scratch_class if the verifier
2281 // was invoked in the middle of the class redefinition.
2282 // Otherwise it returns its argument value which is the _the_class Klass*.
2283 // Please, refer to the description in the jvmtiThreadSate.hpp.
2284 
2285 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2286   JVMWrapper("JVM_GetClassNameUTF");
2287   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2288   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2289   return k->name()->as_utf8();
2290 JVM_END
2291 
2292 
2293 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2294   JVMWrapper("JVM_GetClassCPTypes");
2295   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2296   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2297   // types will have length zero if this is not an InstanceKlass
2298   // (length is determined by call to JVM_GetClassCPEntriesCount)
2299   if (k->is_instance_klass()) {
2300     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2301     for (int index = cp->length() - 1; index >= 0; index--) {
2302       constantTag tag = cp->tag_at(index);
2303       types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2304     }
2305   }
2306 JVM_END
2307 
2308 
2309 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2310   JVMWrapper("JVM_GetClassCPEntriesCount");
2311   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2312   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2313   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2314 JVM_END
2315 
2316 
2317 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2318   JVMWrapper("JVM_GetClassFieldsCount");
2319   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2320   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2321   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2322 JVM_END
2323 
2324 
2325 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2326   JVMWrapper("JVM_GetClassMethodsCount");
2327   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2328   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2329   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2330 JVM_END
2331 
2332 
2333 // The following methods, used for the verifier, are never called with
2334 // array klasses, so a direct cast to InstanceKlass is safe.
2335 // Typically, these methods are called in a loop with bounds determined
2336 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2337 // zero for arrays.
2338 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2339   JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2340   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2341   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2342   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2343   int length = method->checked_exceptions_length();
2344   if (length > 0) {
2345     CheckedExceptionElement* table= method->checked_exceptions_start();
2346     for (int i = 0; i < length; i++) {
2347       exceptions[i] = table[i].class_cp_index;
2348     }
2349   }
2350 JVM_END
2351 
2352 
2353 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2354   JVMWrapper("JVM_GetMethodIxExceptionsCount");
2355   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2356   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2357   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2358   return method->checked_exceptions_length();
2359 JVM_END
2360 
2361 
2362 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2363   JVMWrapper("JVM_GetMethodIxByteCode");
2364   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2365   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2366   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2367   memcpy(code, method->code_base(), method->code_size());
2368 JVM_END
2369 
2370 
2371 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2372   JVMWrapper("JVM_GetMethodIxByteCodeLength");
2373   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2374   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2375   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2376   return method->code_size();
2377 JVM_END
2378 
2379 
2380 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2381   JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2382   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2383   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2384   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2385   ExceptionTable extable(method);
2386   entry->start_pc   = extable.start_pc(entry_index);
2387   entry->end_pc     = extable.end_pc(entry_index);
2388   entry->handler_pc = extable.handler_pc(entry_index);
2389   entry->catchType  = extable.catch_type_index(entry_index);
2390 JVM_END
2391 
2392 
2393 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2394   JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2395   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2396   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2397   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2398   return method->exception_table_length();
2399 JVM_END
2400 
2401 
2402 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2403   JVMWrapper("JVM_GetMethodIxModifiers");
2404   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2405   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2406   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2407   return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2408 JVM_END
2409 
2410 
2411 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2412   JVMWrapper("JVM_GetFieldIxModifiers");
2413   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2414   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2415   return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2416 JVM_END
2417 
2418 
2419 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2420   JVMWrapper("JVM_GetMethodIxLocalsCount");
2421   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2422   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2423   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2424   return method->max_locals();
2425 JVM_END
2426 
2427 
2428 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2429   JVMWrapper("JVM_GetMethodIxArgsSize");
2430   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2431   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2432   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2433   return method->size_of_parameters();
2434 JVM_END
2435 
2436 
2437 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2438   JVMWrapper("JVM_GetMethodIxMaxStack");
2439   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2440   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2441   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2442   return method->verifier_max_stack();
2443 JVM_END
2444 
2445 
2446 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2447   JVMWrapper("JVM_IsConstructorIx");
2448   ResourceMark rm(THREAD);
2449   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2450   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2451   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2452   return method->name() == vmSymbols::object_initializer_name();
2453 JVM_END
2454 
2455 
2456 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2457   JVMWrapper("JVM_IsVMGeneratedMethodIx");
2458   ResourceMark rm(THREAD);
2459   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2460   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2461   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2462   return method->is_overpass();
2463 JVM_END
2464 
2465 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2466   JVMWrapper("JVM_GetMethodIxIxUTF");
2467   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2468   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2469   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2470   return method->name()->as_utf8();
2471 JVM_END
2472 
2473 
2474 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2475   JVMWrapper("JVM_GetMethodIxSignatureUTF");
2476   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2477   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2478   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2479   return method->signature()->as_utf8();
2480 JVM_END
2481 
2482 /**
2483  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2484  * read entries in the constant pool.  Since the old verifier always
2485  * works on a copy of the code, it will not see any rewriting that
2486  * may possibly occur in the middle of verification.  So it is important
2487  * that nothing it calls tries to use the cpCache instead of the raw
2488  * constant pool, so we must use cp->uncached_x methods when appropriate.
2489  */
2490 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2491   JVMWrapper("JVM_GetCPFieldNameUTF");
2492   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2493   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2494   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2495   switch (cp->tag_at(cp_index).value()) {
2496     case JVM_CONSTANT_Fieldref:
2497       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2498     default:
2499       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2500   }
2501   ShouldNotReachHere();
2502   return NULL;
2503 JVM_END
2504 
2505 
2506 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2507   JVMWrapper("JVM_GetCPMethodNameUTF");
2508   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2509   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2510   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2511   switch (cp->tag_at(cp_index).value()) {
2512     case JVM_CONSTANT_InterfaceMethodref:
2513     case JVM_CONSTANT_Methodref:
2514       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2515     default:
2516       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2517   }
2518   ShouldNotReachHere();
2519   return NULL;
2520 JVM_END
2521 
2522 
2523 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2524   JVMWrapper("JVM_GetCPMethodSignatureUTF");
2525   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2526   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2527   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2528   switch (cp->tag_at(cp_index).value()) {
2529     case JVM_CONSTANT_InterfaceMethodref:
2530     case JVM_CONSTANT_Methodref:
2531       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2532     default:
2533       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2534   }
2535   ShouldNotReachHere();
2536   return NULL;
2537 JVM_END
2538 
2539 
2540 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2541   JVMWrapper("JVM_GetCPFieldSignatureUTF");
2542   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2543   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2544   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2545   switch (cp->tag_at(cp_index).value()) {
2546     case JVM_CONSTANT_Fieldref:
2547       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2548     default:
2549       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2550   }
2551   ShouldNotReachHere();
2552   return NULL;
2553 JVM_END
2554 
2555 
2556 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2557   JVMWrapper("JVM_GetCPClassNameUTF");
2558   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2559   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2560   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2561   Symbol* classname = cp->klass_name_at(cp_index);
2562   return classname->as_utf8();
2563 JVM_END
2564 
2565 
2566 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2567   JVMWrapper("JVM_GetCPFieldClassNameUTF");
2568   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2569   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2570   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2571   switch (cp->tag_at(cp_index).value()) {
2572     case JVM_CONSTANT_Fieldref: {
2573       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2574       Symbol* classname = cp->klass_name_at(class_index);
2575       return classname->as_utf8();
2576     }
2577     default:
2578       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2579   }
2580   ShouldNotReachHere();
2581   return NULL;
2582 JVM_END
2583 
2584 
2585 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2586   JVMWrapper("JVM_GetCPMethodClassNameUTF");
2587   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2588   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2589   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2590   switch (cp->tag_at(cp_index).value()) {
2591     case JVM_CONSTANT_Methodref:
2592     case JVM_CONSTANT_InterfaceMethodref: {
2593       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2594       Symbol* classname = cp->klass_name_at(class_index);
2595       return classname->as_utf8();
2596     }
2597     default:
2598       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2599   }
2600   ShouldNotReachHere();
2601   return NULL;
2602 JVM_END
2603 
2604 
2605 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2606   JVMWrapper("JVM_GetCPFieldModifiers");
2607   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2608   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2609   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2610   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2611   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2612   ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2613   switch (cp->tag_at(cp_index).value()) {
2614     case JVM_CONSTANT_Fieldref: {
2615       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2616       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2617       InstanceKlass* ik = InstanceKlass::cast(k_called);
2618       for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2619         if (fs.name() == name && fs.signature() == signature) {
2620           return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2621         }
2622       }
2623       return -1;
2624     }
2625     default:
2626       fatal("JVM_GetCPFieldModifiers: illegal constant");
2627   }
2628   ShouldNotReachHere();
2629   return 0;
2630 JVM_END
2631 
2632 
2633 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2634   JVMWrapper("JVM_GetCPMethodModifiers");
2635   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2637   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2638   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2639   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2640   switch (cp->tag_at(cp_index).value()) {
2641     case JVM_CONSTANT_Methodref:
2642     case JVM_CONSTANT_InterfaceMethodref: {
2643       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2644       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2645       Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2646       int methods_count = methods->length();
2647       for (int i = 0; i < methods_count; i++) {
2648         Method* method = methods->at(i);
2649         if (method->name() == name && method->signature() == signature) {
2650             return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2651         }
2652       }
2653       return -1;
2654     }
2655     default:
2656       fatal("JVM_GetCPMethodModifiers: illegal constant");
2657   }
2658   ShouldNotReachHere();
2659   return 0;
2660 JVM_END
2661 
2662 
2663 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2664 
2665 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2666   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2667 JVM_END
2668 
2669 
2670 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2671   JVMWrapper("JVM_IsSameClassPackage");
2672   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2673   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2674   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2675   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2676   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2677 JVM_END
2678 
2679 // Printing support //////////////////////////////////////////////////
2680 extern "C" {
2681 
2682 ATTRIBUTE_PRINTF(3, 0)
2683 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2684   // see bug 4399518, 4417214
2685   if ((intptr_t)count <= 0) return -1;
2686 
2687   int result = vsnprintf(str, count, fmt, args);
2688   // Note: on truncation vsnprintf(3) on Unix returns numbers of
2689   // characters which would have been written had the buffer been large
2690   // enough; on Windows, it returns -1. We handle both cases here and
2691   // always return -1, and perform null termination.
2692   if ((result > 0 && (size_t)result >= count) || result == -1) {
2693     str[count - 1] = '\0';
2694     result = -1;
2695   }
2696 
2697   return result;
2698 }
2699 
2700 ATTRIBUTE_PRINTF(3, 0)
2701 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2702   va_list args;
2703   int len;
2704   va_start(args, fmt);
2705   len = jio_vsnprintf(str, count, fmt, args);
2706   va_end(args);
2707   return len;
2708 }
2709 
2710 ATTRIBUTE_PRINTF(2,3)
2711 int jio_fprintf(FILE* f, const char *fmt, ...) {
2712   int len;
2713   va_list args;
2714   va_start(args, fmt);
2715   len = jio_vfprintf(f, fmt, args);
2716   va_end(args);
2717   return len;
2718 }
2719 
2720 ATTRIBUTE_PRINTF(2, 0)
2721 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2722   if (Arguments::vfprintf_hook() != NULL) {
2723      return Arguments::vfprintf_hook()(f, fmt, args);
2724   } else {
2725     return vfprintf(f, fmt, args);
2726   }
2727 }
2728 
2729 ATTRIBUTE_PRINTF(1, 2)
2730 JNIEXPORT int jio_printf(const char *fmt, ...) {
2731   int len;
2732   va_list args;
2733   va_start(args, fmt);
2734   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2735   va_end(args);
2736   return len;
2737 }
2738 
2739 
2740 // HotSpot specific jio method
2741 void jio_print(const char* s) {
2742   // Try to make this function as atomic as possible.
2743   if (Arguments::vfprintf_hook() != NULL) {
2744     jio_fprintf(defaultStream::output_stream(), "%s", s);
2745   } else {
2746     // Make an unused local variable to avoid warning from gcc 4.x compiler.
2747     size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2748   }
2749 }
2750 
2751 } // Extern C
2752 
2753 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2754 
2755 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2756 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2757 // OSThread objects.  The exception to this rule is when the target object is the thread
2758 // doing the operation, in which case we know that the thread won't exit until the
2759 // operation is done (all exits being voluntary).  There are a few cases where it is
2760 // rather silly to do operations on yourself, like resuming yourself or asking whether
2761 // you are alive.  While these can still happen, they are not subject to deadlocks if
2762 // the lock is held while the operation occurs (this is not the case for suspend, for
2763 // instance), and are very unlikely.  Because IsAlive needs to be fast and its
2764 // implementation is local to this file, we always lock Threads_lock for that one.
2765 
2766 static void thread_entry(JavaThread* thread, TRAPS) {
2767   HandleMark hm(THREAD);
2768   Handle obj(THREAD, thread->threadObj());
2769   JavaValue result(T_VOID);
2770   JavaCalls::call_virtual(&result,
2771                           obj,
2772                           SystemDictionary::Thread_klass(),
2773                           vmSymbols::run_method_name(),
2774                           vmSymbols::void_method_signature(),
2775                           THREAD);
2776 }
2777 
2778 
2779 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2780   JVMWrapper("JVM_StartThread");
2781   JavaThread *native_thread = NULL;
2782 
2783   // We cannot hold the Threads_lock when we throw an exception,
2784   // due to rank ordering issues. Example:  we might need to grab the
2785   // Heap_lock while we construct the exception.
2786   bool throw_illegal_thread_state = false;
2787 
2788   // We must release the Threads_lock before we can post a jvmti event
2789   // in Thread::start.
2790   {
2791     // Ensure that the C++ Thread and OSThread structures aren't freed before
2792     // we operate.
2793     MutexLocker mu(Threads_lock);
2794 
2795     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2796     // re-starting an already started thread, so we should usually find
2797     // that the JavaThread is null. However for a JNI attached thread
2798     // there is a small window between the Thread object being created
2799     // (with its JavaThread set) and the update to its threadStatus, so we
2800     // have to check for this
2801     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2802       throw_illegal_thread_state = true;
2803     } else {
2804       // We could also check the stillborn flag to see if this thread was already stopped, but
2805       // for historical reasons we let the thread detect that itself when it starts running
2806 
2807       jlong size =
2808              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2809       // Allocate the C++ Thread structure and create the native thread.  The
2810       // stack size retrieved from java is 64-bit signed, but the constructor takes
2811       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2812       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2813       //  - Avoid passing negative values which would result in really large stacks.
2814       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2815       size_t sz = size > 0 ? (size_t) size : 0;
2816       native_thread = new JavaThread(&thread_entry, sz);
2817 
2818       // At this point it may be possible that no osthread was created for the
2819       // JavaThread due to lack of memory. Check for this situation and throw
2820       // an exception if necessary. Eventually we may want to change this so
2821       // that we only grab the lock if the thread was created successfully -
2822       // then we can also do this check and throw the exception in the
2823       // JavaThread constructor.
2824       if (native_thread->osthread() != NULL) {
2825         // Note: the current thread is not being used within "prepare".
2826         native_thread->prepare(jthread);
2827       }
2828     }
2829   }
2830 
2831   if (throw_illegal_thread_state) {
2832     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2833   }
2834 
2835   assert(native_thread != NULL, "Starting null thread?");
2836 
2837   if (native_thread->osthread() == NULL) {
2838     // No one should hold a reference to the 'native_thread'.
2839     delete native_thread;
2840     if (JvmtiExport::should_post_resource_exhausted()) {
2841       JvmtiExport::post_resource_exhausted(
2842         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2843         os::native_thread_creation_failed_msg());
2844     }
2845     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2846               os::native_thread_creation_failed_msg());
2847   }
2848 
2849   Thread::start(native_thread);
2850 
2851 JVM_END
2852 
2853 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2854 // before the quasi-asynchronous exception is delivered.  This is a little obtrusive,
2855 // but is thought to be reliable and simple. In the case, where the receiver is the
2856 // same thread as the sender, no safepoint is needed.
2857 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2858   JVMWrapper("JVM_StopThread");
2859 
2860   oop java_throwable = JNIHandles::resolve(throwable);
2861   if (java_throwable == NULL) {
2862     THROW(vmSymbols::java_lang_NullPointerException());
2863   }
2864   oop java_thread = JNIHandles::resolve_non_null(jthread);
2865   JavaThread* receiver = java_lang_Thread::thread(java_thread);
2866   Events::log_exception(JavaThread::current(),
2867                         "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2868                         p2i(receiver), p2i((address)java_thread), p2i(throwable));
2869   // First check if thread is alive
2870   if (receiver != NULL) {
2871     // Check if exception is getting thrown at self (use oop equality, since the
2872     // target object might exit)
2873     if (java_thread == thread->threadObj()) {
2874       THROW_OOP(java_throwable);
2875     } else {
2876       // Enques a VM_Operation to stop all threads and then deliver the exception...
2877       Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2878     }
2879   }
2880   else {
2881     // Either:
2882     // - target thread has not been started before being stopped, or
2883     // - target thread already terminated
2884     // We could read the threadStatus to determine which case it is
2885     // but that is overkill as it doesn't matter. We must set the
2886     // stillborn flag for the first case, and if the thread has already
2887     // exited setting this flag has no affect
2888     java_lang_Thread::set_stillborn(java_thread);
2889   }
2890 JVM_END
2891 
2892 
2893 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2894   JVMWrapper("JVM_IsThreadAlive");
2895 
2896   oop thread_oop = JNIHandles::resolve_non_null(jthread);
2897   return java_lang_Thread::is_alive(thread_oop);
2898 JVM_END
2899 
2900 
2901 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2902   JVMWrapper("JVM_SuspendThread");
2903   oop java_thread = JNIHandles::resolve_non_null(jthread);
2904   JavaThread* receiver = java_lang_Thread::thread(java_thread);
2905 
2906   if (receiver != NULL) {
2907     // thread has run and has not exited (still on threads list)
2908 
2909     {
2910       MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2911       if (receiver->is_external_suspend()) {
2912         // Don't allow nested external suspend requests. We can't return
2913         // an error from this interface so just ignore the problem.
2914         return;
2915       }
2916       if (receiver->is_exiting()) { // thread is in the process of exiting
2917         return;
2918       }
2919       receiver->set_external_suspend();
2920     }
2921 
2922     // java_suspend() will catch threads in the process of exiting
2923     // and will ignore them.
2924     receiver->java_suspend();
2925 
2926     // It would be nice to have the following assertion in all the
2927     // time, but it is possible for a racing resume request to have
2928     // resumed this thread right after we suspended it. Temporarily
2929     // enable this assertion if you are chasing a different kind of
2930     // bug.
2931     //
2932     // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2933     //   receiver->is_being_ext_suspended(), "thread is not suspended");
2934   }
2935 JVM_END
2936 
2937 
2938 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2939   JVMWrapper("JVM_ResumeThread");
2940   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2941   // We need to *always* get the threads lock here, since this operation cannot be allowed during
2942   // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2943   // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2944   // looks at it.
2945   MutexLocker ml(Threads_lock);
2946   JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2947   if (thr != NULL) {
2948     // the thread has run and is not in the process of exiting
2949     thr->java_resume();
2950   }
2951 JVM_END
2952 
2953 
2954 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2955   JVMWrapper("JVM_SetThreadPriority");
2956   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2957   MutexLocker ml(Threads_lock);
2958   oop java_thread = JNIHandles::resolve_non_null(jthread);
2959   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2960   JavaThread* thr = java_lang_Thread::thread(java_thread);
2961   if (thr != NULL) {                  // Thread not yet started; priority pushed down when it is
2962     Thread::set_priority(thr, (ThreadPriority)prio);
2963   }
2964 JVM_END
2965 
2966 
2967 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2968   JVMWrapper("JVM_Yield");
2969   if (os::dont_yield()) return;
2970   HOTSPOT_THREAD_YIELD();
2971   os::naked_yield();
2972 JVM_END
2973 
2974 
2975 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2976   JVMWrapper("JVM_Sleep");
2977 
2978   if (millis < 0) {
2979     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2980   }
2981 
2982   if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2983     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2984   }
2985 
2986   // Save current thread state and restore it at the end of this block.
2987   // And set new thread state to SLEEPING.
2988   JavaThreadSleepState jtss(thread);
2989 
2990   HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2991 
2992   EventThreadSleep event;
2993 
2994   if (millis == 0) {
2995     os::naked_yield();
2996   } else {
2997     ThreadState old_state = thread->osthread()->get_state();
2998     thread->osthread()->set_state(SLEEPING);
2999     if (os::sleep(thread, millis, true) == OS_INTRPT) {
3000       // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3001       // us while we were sleeping. We do not overwrite those.
3002       if (!HAS_PENDING_EXCEPTION) {
3003         if (event.should_commit()) {
3004           event.set_time(millis);
3005           event.commit();
3006         }
3007         HOTSPOT_THREAD_SLEEP_END(1);
3008 
3009         // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3010         // to properly restore the thread state.  That's likely wrong.
3011         THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3012       }
3013     }
3014     thread->osthread()->set_state(old_state);
3015   }
3016   if (event.should_commit()) {
3017     event.set_time(millis);
3018     event.commit();
3019   }
3020   HOTSPOT_THREAD_SLEEP_END(0);
3021 JVM_END
3022 
3023 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3024   JVMWrapper("JVM_CurrentThread");
3025   oop jthread = thread->threadObj();
3026   assert (thread != NULL, "no current thread!");
3027   return JNIHandles::make_local(env, jthread);
3028 JVM_END
3029 
3030 
3031 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3032   JVMWrapper("JVM_CountStackFrames");
3033 
3034   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3035   oop java_thread = JNIHandles::resolve_non_null(jthread);
3036   bool throw_illegal_thread_state = false;
3037   int count = 0;
3038 
3039   {
3040     MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3041     // We need to re-resolve the java_thread, since a GC might have happened during the
3042     // acquire of the lock
3043     JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3044 
3045     if (thr == NULL) {
3046       // do nothing
3047     } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3048       // Check whether this java thread has been suspended already. If not, throws
3049       // IllegalThreadStateException. We defer to throw that exception until
3050       // Threads_lock is released since loading exception class has to leave VM.
3051       // The correct way to test a thread is actually suspended is
3052       // wait_for_ext_suspend_completion(), but we can't call that while holding
3053       // the Threads_lock. The above tests are sufficient for our purposes
3054       // provided the walkability of the stack is stable - which it isn't
3055       // 100% but close enough for most practical purposes.
3056       throw_illegal_thread_state = true;
3057     } else {
3058       // Count all java activation, i.e., number of vframes
3059       for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3060         // Native frames are not counted
3061         if (!vfst.method()->is_native()) count++;
3062        }
3063     }
3064   }
3065 
3066   if (throw_illegal_thread_state) {
3067     THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3068                 "this thread is not suspended");
3069   }
3070   return count;
3071 JVM_END
3072 
3073 // Consider: A better way to implement JVM_Interrupt() is to acquire
3074 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3075 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3076 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3077 // outside the critical section.  Threads_lock is hot so we want to minimize
3078 // the hold-time.  A cleaner interface would be to decompose interrupt into
3079 // two steps.  The 1st phase, performed under Threads_lock, would return
3080 // a closure that'd be invoked after Threads_lock was dropped.
3081 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3082 // admit spurious wakeups.
3083 
3084 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3085   JVMWrapper("JVM_Interrupt");
3086 
3087   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3088   oop java_thread = JNIHandles::resolve_non_null(jthread);
3089   MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3090   // We need to re-resolve the java_thread, since a GC might have happened during the
3091   // acquire of the lock
3092   JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3093   if (thr != NULL) {
3094     Thread::interrupt(thr);
3095   }
3096 JVM_END
3097 
3098 
3099 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3100   JVMWrapper("JVM_IsInterrupted");
3101 
3102   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3103   oop java_thread = JNIHandles::resolve_non_null(jthread);
3104   MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3105   // We need to re-resolve the java_thread, since a GC might have happened during the
3106   // acquire of the lock
3107   JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3108   if (thr == NULL) {
3109     return JNI_FALSE;
3110   } else {
3111     return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3112   }
3113 JVM_END
3114 
3115 
3116 // Return true iff the current thread has locked the object passed in
3117 
3118 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3119   JVMWrapper("JVM_HoldsLock");
3120   assert(THREAD->is_Java_thread(), "sanity check");
3121   if (obj == NULL) {
3122     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3123   }
3124   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3125   return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3126 JVM_END
3127 
3128 
3129 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3130   JVMWrapper("JVM_DumpAllStacks");
3131   VM_PrintThreads op;
3132   VMThread::execute(&op);
3133   if (JvmtiExport::should_post_data_dump()) {
3134     JvmtiExport::post_data_dump();
3135   }
3136 JVM_END
3137 
3138 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3139   JVMWrapper("JVM_SetNativeThreadName");
3140   ResourceMark rm(THREAD);
3141   oop java_thread = JNIHandles::resolve_non_null(jthread);
3142   JavaThread* thr = java_lang_Thread::thread(java_thread);
3143   // Thread naming only supported for the current thread, doesn't work for
3144   // target threads.
3145   if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3146     // we don't set the name of an attached thread to avoid stepping
3147     // on other programs
3148     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3149     os::set_native_thread_name(thread_name);
3150   }
3151 JVM_END
3152 
3153 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3154 
3155 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3156   assert(jthread->is_Java_thread(), "must be a Java thread");
3157   if (jthread->privileged_stack_top() == NULL) return false;
3158   if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3159     oop loader = jthread->privileged_stack_top()->class_loader();
3160     if (loader == NULL) return true;
3161     bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3162     if (trusted) return true;
3163   }
3164   return false;
3165 }
3166 
3167 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3168   JVMWrapper("JVM_CurrentLoadedClass");
3169   ResourceMark rm(THREAD);
3170 
3171   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3172     // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3173     bool trusted = is_trusted_frame(thread, &vfst);
3174     if (trusted) return NULL;
3175 
3176     Method* m = vfst.method();
3177     if (!m->is_native()) {
3178       InstanceKlass* holder = m->method_holder();
3179       oop loader = holder->class_loader();
3180       if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3181         return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3182       }
3183     }
3184   }
3185   return NULL;
3186 JVM_END
3187 
3188 
3189 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3190   JVMWrapper("JVM_CurrentClassLoader");
3191   ResourceMark rm(THREAD);
3192 
3193   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3194 
3195     // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3196     bool trusted = is_trusted_frame(thread, &vfst);
3197     if (trusted) return NULL;
3198 
3199     Method* m = vfst.method();
3200     if (!m->is_native()) {
3201       InstanceKlass* holder = m->method_holder();
3202       assert(holder->is_klass(), "just checking");
3203       oop loader = holder->class_loader();
3204       if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3205         return JNIHandles::make_local(env, loader);
3206       }
3207     }
3208   }
3209   return NULL;
3210 JVM_END
3211 
3212 
3213 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3214   JVMWrapper("JVM_GetClassContext");
3215   ResourceMark rm(THREAD);
3216   JvmtiVMObjectAllocEventCollector oam;
3217   vframeStream vfst(thread);
3218 
3219   if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3220     // This must only be called from SecurityManager.getClassContext
3221     Method* m = vfst.method();
3222     if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3223           m->name()          == vmSymbols::getClassContext_name() &&
3224           m->signature()     == vmSymbols::void_class_array_signature())) {
3225       THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3226     }
3227   }
3228 
3229   // Collect method holders
3230   GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3231   for (; !vfst.at_end(); vfst.security_next()) {
3232     Method* m = vfst.method();
3233     // Native frames are not returned
3234     if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3235       Klass* holder = m->method_holder();
3236       assert(holder->is_klass(), "just checking");
3237       klass_array->append(holder);
3238     }
3239   }
3240 
3241   // Create result array of type [Ljava/lang/Class;
3242   objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3243   // Fill in mirrors corresponding to method holders
3244   for (int i = 0; i < klass_array->length(); i++) {
3245     result->obj_at_put(i, klass_array->at(i)->java_mirror());
3246   }
3247 
3248   return (jobjectArray) JNIHandles::make_local(env, result);
3249 JVM_END
3250 
3251 
3252 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3253   JVMWrapper("JVM_ClassDepth");
3254   ResourceMark rm(THREAD);
3255   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3256   Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3257 
3258   const char* str = java_lang_String::as_utf8_string(class_name_str());
3259   TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3260   if (class_name_sym == NULL) {
3261     return -1;
3262   }
3263 
3264   int depth = 0;
3265 
3266   for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3267     if (!vfst.method()->is_native()) {
3268       InstanceKlass* holder = vfst.method()->method_holder();
3269       assert(holder->is_klass(), "just checking");
3270       if (holder->name() == class_name_sym) {
3271         return depth;
3272       }
3273       depth++;
3274     }
3275   }
3276   return -1;
3277 JVM_END
3278 
3279 
3280 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3281   JVMWrapper("JVM_ClassLoaderDepth");
3282   ResourceMark rm(THREAD);
3283   int depth = 0;
3284   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3285     // if a method in a class in a trusted loader is in a doPrivileged, return -1
3286     bool trusted = is_trusted_frame(thread, &vfst);
3287     if (trusted) return -1;
3288 
3289     Method* m = vfst.method();
3290     if (!m->is_native()) {
3291       InstanceKlass* holder = m->method_holder();
3292       assert(holder->is_klass(), "just checking");
3293       oop loader = holder->class_loader();
3294       if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3295         return depth;
3296       }
3297       depth++;
3298     }
3299   }
3300   return -1;
3301 JVM_END
3302 
3303 
3304 // java.lang.Package ////////////////////////////////////////////////////////////////
3305 
3306 
3307 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3308   JVMWrapper("JVM_GetSystemPackage");
3309   ResourceMark rm(THREAD);
3310   JvmtiVMObjectAllocEventCollector oam;
3311   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3312   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3313   return (jstring) JNIHandles::make_local(result);
3314 JVM_END
3315 
3316 
3317 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3318   JVMWrapper("JVM_GetSystemPackages");
3319   JvmtiVMObjectAllocEventCollector oam;
3320   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3321   return (jobjectArray) JNIHandles::make_local(result);
3322 JVM_END
3323 
3324 
3325 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3326 
3327 
3328 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3329   JVMWrapper("JVM_GetAndClearReferencePendingList");
3330 
3331   MonitorLockerEx ml(Heap_lock);
3332   oop ref = Universe::reference_pending_list();
3333   if (ref != NULL) {
3334     Universe::set_reference_pending_list(NULL);
3335   }
3336   return JNIHandles::make_local(env, ref);
3337 JVM_END
3338 
3339 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3340   JVMWrapper("JVM_HasReferencePendingList");
3341   MonitorLockerEx ml(Heap_lock);
3342   return Universe::has_reference_pending_list();
3343 JVM_END
3344 
3345 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3346   JVMWrapper("JVM_WaitForReferencePendingList");
3347   MonitorLockerEx ml(Heap_lock);
3348   while (!Universe::has_reference_pending_list()) {
3349     ml.wait();
3350   }
3351 JVM_END
3352 
3353 
3354 // ObjectInputStream ///////////////////////////////////////////////////////////////
3355 
3356 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3357   if (current_class == NULL) {
3358     return true;
3359   }
3360   if ((current_class == field_class) || access.is_public()) {
3361     return true;
3362   }
3363 
3364   if (access.is_protected()) {
3365     // See if current_class is a subclass of field_class
3366     if (current_class->is_subclass_of(field_class)) {
3367       return true;
3368     }
3369   }
3370 
3371   return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3372 }
3373 
3374 // Return the first user-defined class loader up the execution stack, or null
3375 // if only code from the bootstrap or platform class loader is on the stack.
3376 
3377 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3378   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3379     vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3380     oop loader = vfst.method()->method_holder()->class_loader();
3381     if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3382       return JNIHandles::make_local(env, loader);
3383     }
3384   }
3385   return NULL;
3386 JVM_END
3387 
3388 
3389 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3390 
3391 
3392 // resolve array handle and check arguments
3393 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3394   if (arr == NULL) {
3395     THROW_0(vmSymbols::java_lang_NullPointerException());
3396   }
3397   oop a = JNIHandles::resolve_non_null(arr);
3398   if (!a->is_array()) {
3399     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3400   } else if (type_array_only && !a->is_typeArray()) {
3401     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3402   }
3403   return arrayOop(a);
3404 }
3405 
3406 
3407 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3408   JVMWrapper("JVM_GetArrayLength");
3409   arrayOop a = check_array(env, arr, false, CHECK_0);
3410   return a->length();
3411 JVM_END
3412 
3413 
3414 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3415   JVMWrapper("JVM_Array_Get");
3416   JvmtiVMObjectAllocEventCollector oam;
3417   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3418   jvalue value;
3419   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3420   oop box = Reflection::box(&value, type, CHECK_NULL);
3421   return JNIHandles::make_local(env, box);
3422 JVM_END
3423 
3424 
3425 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3426   JVMWrapper("JVM_GetPrimitiveArrayElement");
3427   jvalue value;
3428   value.i = 0; // to initialize value before getting used in CHECK
3429   arrayOop a = check_array(env, arr, true, CHECK_(value));
3430   assert(a->is_typeArray(), "just checking");
3431   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3432   BasicType wide_type = (BasicType) wCode;
3433   if (type != wide_type) {
3434     Reflection::widen(&value, type, wide_type, CHECK_(value));
3435   }
3436   return value;
3437 JVM_END
3438 
3439 
3440 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3441   JVMWrapper("JVM_SetArrayElement");
3442   arrayOop a = check_array(env, arr, false, CHECK);
3443   oop box = JNIHandles::resolve(val);
3444   jvalue value;
3445   value.i = 0; // to initialize value before getting used in CHECK
3446   BasicType value_type;
3447   if (a->is_objArray()) {
3448     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3449     value_type = Reflection::unbox_for_regular_object(box, &value);
3450   } else {
3451     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3452   }
3453   Reflection::array_set(&value, a, index, value_type, CHECK);
3454 JVM_END
3455 
3456 
3457 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3458   JVMWrapper("JVM_SetPrimitiveArrayElement");
3459   arrayOop a = check_array(env, arr, true, CHECK);
3460   assert(a->is_typeArray(), "just checking");
3461   BasicType value_type = (BasicType) vCode;
3462   Reflection::array_set(&v, a, index, value_type, CHECK);
3463 JVM_END
3464 
3465 
3466 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3467   JVMWrapper("JVM_NewArray");
3468   JvmtiVMObjectAllocEventCollector oam;
3469   oop element_mirror = JNIHandles::resolve(eltClass);
3470   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3471   return JNIHandles::make_local(env, result);
3472 JVM_END
3473 
3474 
3475 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3476   JVMWrapper("JVM_NewMultiArray");
3477   JvmtiVMObjectAllocEventCollector oam;
3478   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3479   oop element_mirror = JNIHandles::resolve(eltClass);
3480   assert(dim_array->is_typeArray(), "just checking");
3481   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3482   return JNIHandles::make_local(env, result);
3483 JVM_END
3484 
3485 
3486 // Library support ///////////////////////////////////////////////////////////////////////////
3487 
3488 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3489   //%note jvm_ct
3490   JVMWrapper("JVM_LoadLibrary");
3491   char ebuf[1024];
3492   void *load_result;
3493   {
3494     ThreadToNativeFromVM ttnfvm(thread);
3495     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3496   }
3497   if (load_result == NULL) {
3498     char msg[1024];
3499     jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3500     // Since 'ebuf' may contain a string encoded using
3501     // platform encoding scheme, we need to pass
3502     // Exceptions::unsafe_to_utf8 to the new_exception method
3503     // as the last argument. See bug 6367357.
3504     Handle h_exception =
3505       Exceptions::new_exception(thread,
3506                                 vmSymbols::java_lang_UnsatisfiedLinkError(),
3507                                 msg, Exceptions::unsafe_to_utf8);
3508 
3509     THROW_HANDLE_0(h_exception);
3510   }
3511   return load_result;
3512 JVM_END
3513 
3514 
3515 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3516   JVMWrapper("JVM_UnloadLibrary");
3517   os::dll_unload(handle);
3518 JVM_END
3519 
3520 
3521 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3522   JVMWrapper("JVM_FindLibraryEntry");
3523   return os::dll_lookup(handle, name);
3524 JVM_END
3525 
3526 
3527 // JNI version ///////////////////////////////////////////////////////////////////////////////
3528 
3529 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3530   JVMWrapper("JVM_IsSupportedJNIVersion");
3531   return Threads::is_supported_jni_version_including_1_1(version);
3532 JVM_END
3533 
3534 
3535 // String support ///////////////////////////////////////////////////////////////////////////
3536 
3537 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3538   JVMWrapper("JVM_InternString");
3539   JvmtiVMObjectAllocEventCollector oam;
3540   if (str == NULL) return NULL;
3541   oop string = JNIHandles::resolve_non_null(str);
3542   oop result = StringTable::intern(string, CHECK_NULL);
3543   return (jstring) JNIHandles::make_local(env, result);
3544 JVM_END
3545 
3546 
3547 // Raw monitor support //////////////////////////////////////////////////////////////////////
3548 
3549 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3550 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3551 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3552 // that only works with java threads.
3553 
3554 
3555 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3556   VM_Exit::block_if_vm_exited();
3557   JVMWrapper("JVM_RawMonitorCreate");
3558   return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3559 }
3560 
3561 
3562 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3563   VM_Exit::block_if_vm_exited();
3564   JVMWrapper("JVM_RawMonitorDestroy");
3565   delete ((Mutex*) mon);
3566 }
3567 
3568 
3569 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3570   VM_Exit::block_if_vm_exited();
3571   JVMWrapper("JVM_RawMonitorEnter");
3572   ((Mutex*) mon)->jvm_raw_lock();
3573   return 0;
3574 }
3575 
3576 
3577 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3578   VM_Exit::block_if_vm_exited();
3579   JVMWrapper("JVM_RawMonitorExit");
3580   ((Mutex*) mon)->jvm_raw_unlock();
3581 }
3582 
3583 
3584 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3585 
3586 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3587                                     Handle loader, Handle protection_domain,
3588                                     jboolean throwError, TRAPS) {
3589   // Security Note:
3590   //   The Java level wrapper will perform the necessary security check allowing
3591   //   us to pass the NULL as the initiating class loader.  The VM is responsible for
3592   //   the checkPackageAccess relative to the initiating class loader via the
3593   //   protection_domain. The protection_domain is passed as NULL by the java code
3594   //   if there is no security manager in 3-arg Class.forName().
3595   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3596 
3597   // Check if we should initialize the class
3598   if (init && klass->is_instance_klass()) {
3599     klass->initialize(CHECK_NULL);
3600   }
3601   return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3602 }
3603 
3604 
3605 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3606 
3607 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3608   JVMWrapper("JVM_InvokeMethod");
3609   Handle method_handle;
3610   if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3611     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3612     Handle receiver(THREAD, JNIHandles::resolve(obj));
3613     objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3614     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3615     jobject res = JNIHandles::make_local(env, result);
3616     if (JvmtiExport::should_post_vm_object_alloc()) {
3617       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3618       assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3619       if (java_lang_Class::is_primitive(ret_type)) {
3620         // Only for primitive type vm allocates memory for java object.
3621         // See box() method.
3622         JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3623       }
3624     }
3625     return res;
3626   } else {
3627     THROW_0(vmSymbols::java_lang_StackOverflowError());
3628   }
3629 JVM_END
3630 
3631 
3632 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3633   JVMWrapper("JVM_NewInstanceFromConstructor");
3634   oop constructor_mirror = JNIHandles::resolve(c);
3635   objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3636   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3637   jobject res = JNIHandles::make_local(env, result);
3638   if (JvmtiExport::should_post_vm_object_alloc()) {
3639     JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3640   }
3641   return res;
3642 JVM_END
3643 
3644 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3645 
3646 JVM_LEAF(jboolean, JVM_SupportsCX8())
3647   JVMWrapper("JVM_SupportsCX8");
3648   return VM_Version::supports_cx8();
3649 JVM_END
3650 
3651 // Returns an array of all live Thread objects (VM internal JavaThreads,
3652 // jvmti agent threads, and JNI attaching threads  are skipped)
3653 // See CR 6404306 regarding JNI attaching threads
3654 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3655   ResourceMark rm(THREAD);
3656   ThreadsListEnumerator tle(THREAD, false, false);
3657   JvmtiVMObjectAllocEventCollector oam;
3658 
3659   int num_threads = tle.num_threads();
3660   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3661   objArrayHandle threads_ah(THREAD, r);
3662 
3663   for (int i = 0; i < num_threads; i++) {
3664     Handle h = tle.get_threadObj(i);
3665     threads_ah->obj_at_put(i, h());
3666   }
3667 
3668   return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3669 JVM_END
3670 
3671 
3672 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3673 // Return StackTraceElement[][], each element is the stack trace of a thread in
3674 // the corresponding entry in the given threads array
3675 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3676   JVMWrapper("JVM_DumpThreads");
3677   JvmtiVMObjectAllocEventCollector oam;
3678 
3679   // Check if threads is null
3680   if (threads == NULL) {
3681     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3682   }
3683 
3684   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3685   objArrayHandle ah(THREAD, a);
3686   int num_threads = ah->length();
3687   // check if threads is non-empty array
3688   if (num_threads == 0) {
3689     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3690   }
3691 
3692   // check if threads is not an array of objects of Thread class
3693   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3694   if (k != SystemDictionary::Thread_klass()) {
3695     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3696   }
3697 
3698   ResourceMark rm(THREAD);
3699 
3700   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3701   for (int i = 0; i < num_threads; i++) {
3702     oop thread_obj = ah->obj_at(i);
3703     instanceHandle h(THREAD, (instanceOop) thread_obj);
3704     thread_handle_array->append(h);
3705   }
3706 
3707   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3708   return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3709 
3710 JVM_END
3711 
3712 // JVM monitoring and management support
3713 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3714   return Management::get_jmm_interface(version);
3715 JVM_END
3716 
3717 // com.sun.tools.attach.VirtualMachine agent properties support
3718 //
3719 // Initialize the agent properties with the properties maintained in the VM
3720 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3721   JVMWrapper("JVM_InitAgentProperties");
3722   ResourceMark rm;
3723 
3724   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3725 
3726   PUTPROP(props, "sun.java.command", Arguments::java_command());
3727   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3728   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3729   return properties;
3730 JVM_END
3731 
3732 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3733 {
3734   JVMWrapper("JVM_GetEnclosingMethodInfo");
3735   JvmtiVMObjectAllocEventCollector oam;
3736 
3737   if (ofClass == NULL) {
3738     return NULL;
3739   }
3740   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3741   // Special handling for primitive objects
3742   if (java_lang_Class::is_primitive(mirror())) {
3743     return NULL;
3744   }
3745   Klass* k = java_lang_Class::as_Klass(mirror());
3746   if (!k->is_instance_klass()) {
3747     return NULL;
3748   }
3749   InstanceKlass* ik = InstanceKlass::cast(k);
3750   int encl_method_class_idx = ik->enclosing_method_class_index();
3751   if (encl_method_class_idx == 0) {
3752     return NULL;
3753   }
3754   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3755   objArrayHandle dest(THREAD, dest_o);
3756   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3757   dest->obj_at_put(0, enc_k->java_mirror());
3758   int encl_method_method_idx = ik->enclosing_method_method_index();
3759   if (encl_method_method_idx != 0) {
3760     Symbol* sym = ik->constants()->symbol_at(
3761                         extract_low_short_from_int(
3762                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3763     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3764     dest->obj_at_put(1, str());
3765     sym = ik->constants()->symbol_at(
3766               extract_high_short_from_int(
3767                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3768     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3769     dest->obj_at_put(2, str());
3770   }
3771   return (jobjectArray) JNIHandles::make_local(dest());
3772 }
3773 JVM_END
3774 
3775 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3776 {
3777   memset(info, 0, info_size);
3778 
3779   info->jvm_version = Abstract_VM_Version::jvm_version();
3780   info->patch_version = Abstract_VM_Version::vm_patch_version();
3781 
3782   // when we add a new capability in the jvm_version_info struct, we should also
3783   // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3784   // counter defined in runtimeService.cpp.
3785   info->is_attachable = AttachListener::is_attach_supported();
3786 }
3787 JVM_END
3788 
3789 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3790 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3791   ResourceMark rm(THREAD);
3792 
3793   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3794     return NULL;
3795   }
3796 
3797   char** vm_flags = Arguments::jvm_flags_array();
3798   char** vm_args = Arguments::jvm_args_array();
3799   int num_flags = Arguments::num_jvm_flags();
3800   int num_args = Arguments::num_jvm_args();
3801 
3802   InstanceKlass* ik = SystemDictionary::String_klass();
3803   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3804   objArrayHandle result_h(THREAD, r);
3805 
3806   int index = 0;
3807   for (int j = 0; j < num_flags; j++, index++) {
3808     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3809     result_h->obj_at_put(index, h());
3810   }
3811   for (int i = 0; i < num_args; i++, index++) {
3812     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3813     result_h->obj_at_put(index, h());
3814   }
3815   return (jobjectArray) JNIHandles::make_local(env, result_h());
3816 JVM_END
3817 
3818 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3819   return os::get_signal_number(name);
3820 JVM_END