1 /*
   2  * Copyright (c) 1997, 2016, 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                           KlassHandle(THREAD, 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   Handle 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   const KlassHandle klass (THREAD, 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());
 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     instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
1001         klass_name, h_loader, CHECK_NULL);
1002     k = ik();
1003   }
1004 #endif
1005   return (k == NULL) ? NULL :
1006             (jclass) JNIHandles::make_local(env, k->java_mirror());
1007 JVM_END
1008 
1009 // Module support //////////////////////////////////////////////////////////////////////////////
1010 
1011 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1012                                  jstring location, jobjectArray packages))
1013   JVMWrapper("JVM_DefineModule");
1014   Modules::define_module(module, version, location, packages, CHECK);
1015 JVM_END
1016 
1017 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1018   JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1019   Modules::set_bootloader_unnamed_module(module, CHECK);
1020 JVM_END
1021 
1022 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1023   JVMWrapper("JVM_AddModuleExports");
1024   Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1025 JVM_END
1026 
1027 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1028   JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1029   Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1030 JVM_END
1031 
1032 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1033   JVMWrapper("JVM_AddModuleExportsToAll");
1034   Modules::add_module_exports(from_module, package, NULL, CHECK);
1035 JVM_END
1036 
1037 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1038   JVMWrapper("JVM_AddReadsModule");
1039   Modules::add_reads_module(from_module, source_module, CHECK);
1040 JVM_END
1041 
1042 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, jstring package))
1043   JVMWrapper("JVM_AddModulePackage");
1044   Modules::add_module_package(module, package, CHECK);
1045 JVM_END
1046 
1047 JVM_ENTRY (jobject, JVM_GetModuleByPackageName(JNIEnv *env, jobject loader, jstring package))
1048   JVMWrapper("JVM_GetModuleByPackageName");
1049   return Modules::get_module_by_package_name(loader, package, THREAD);
1050 JVM_END
1051 
1052 // Reflection support //////////////////////////////////////////////////////////////////////////////
1053 
1054 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1055   assert (cls != NULL, "illegal class");
1056   JVMWrapper("JVM_GetClassName");
1057   JvmtiVMObjectAllocEventCollector oam;
1058   ResourceMark rm(THREAD);
1059   const char* name;
1060   if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1061     name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1062   } else {
1063     // Consider caching interned string in Klass
1064     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1065     assert(k->is_klass(), "just checking");
1066     name = k->external_name();
1067   }
1068   oop result = StringTable::intern((char*) name, CHECK_NULL);
1069   return (jstring) JNIHandles::make_local(env, result);
1070 JVM_END
1071 
1072 
1073 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1074   JVMWrapper("JVM_GetClassInterfaces");
1075   JvmtiVMObjectAllocEventCollector oam;
1076   oop mirror = JNIHandles::resolve_non_null(cls);
1077 
1078   // Special handling for primitive objects
1079   if (java_lang_Class::is_primitive(mirror)) {
1080     // Primitive objects does not have any interfaces
1081     objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1082     return (jobjectArray) JNIHandles::make_local(env, r);
1083   }
1084 
1085   KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1086   // Figure size of result array
1087   int size;
1088   if (klass->is_instance_klass()) {
1089     size = InstanceKlass::cast(klass())->local_interfaces()->length();
1090   } else {
1091     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1092     size = 2;
1093   }
1094 
1095   // Allocate result array
1096   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1097   objArrayHandle result (THREAD, r);
1098   // Fill in result
1099   if (klass->is_instance_klass()) {
1100     // Regular instance klass, fill in all local interfaces
1101     for (int index = 0; index < size; index++) {
1102       Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1103       result->obj_at_put(index, k->java_mirror());
1104     }
1105   } else {
1106     // All arrays implement java.lang.Cloneable and java.io.Serializable
1107     result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1108     result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1109   }
1110   return (jobjectArray) JNIHandles::make_local(env, result());
1111 JVM_END
1112 
1113 
1114 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1115   JVMWrapper("JVM_IsInterface");
1116   oop mirror = JNIHandles::resolve_non_null(cls);
1117   if (java_lang_Class::is_primitive(mirror)) {
1118     return JNI_FALSE;
1119   }
1120   Klass* k = java_lang_Class::as_Klass(mirror);
1121   jboolean result = k->is_interface();
1122   assert(!result || k->is_instance_klass(),
1123          "all interfaces are instance types");
1124   // The compiler intrinsic for isInterface tests the
1125   // Klass::_access_flags bits in the same way.
1126   return result;
1127 JVM_END
1128 
1129 
1130 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1131   JVMWrapper("JVM_GetClassSigners");
1132   JvmtiVMObjectAllocEventCollector oam;
1133   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1134     // There are no signers for primitive types
1135     return NULL;
1136   }
1137 
1138   objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1139 
1140   // If there are no signers set in the class, or if the class
1141   // is an array, return NULL.
1142   if (signers == NULL) return NULL;
1143 
1144   // copy of the signers array
1145   Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1146   objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1147   for (int index = 0; index < signers->length(); index++) {
1148     signers_copy->obj_at_put(index, signers->obj_at(index));
1149   }
1150 
1151   // return the copy
1152   return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1153 JVM_END
1154 
1155 
1156 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1157   JVMWrapper("JVM_SetClassSigners");
1158   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1159     // This call is ignored for primitive types and arrays.
1160     // Signers are only set once, ClassLoader.java, and thus shouldn't
1161     // be called with an array.  Only the bootstrap loader creates arrays.
1162     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1163     if (k->is_instance_klass()) {
1164       java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1165     }
1166   }
1167 JVM_END
1168 
1169 
1170 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1171   JVMWrapper("JVM_GetProtectionDomain");
1172   if (JNIHandles::resolve(cls) == NULL) {
1173     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1174   }
1175 
1176   if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1177     // Primitive types does not have a protection domain.
1178     return NULL;
1179   }
1180 
1181   oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1182   return (jobject) JNIHandles::make_local(env, pd);
1183 JVM_END
1184 
1185 
1186 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1187   // If there is a security manager and protection domain, check the access
1188   // in the protection domain, otherwise it is authorized.
1189   if (java_lang_System::has_security_manager()) {
1190 
1191     // For bootstrapping, if pd implies method isn't in the JDK, allow
1192     // this context to revert to older behavior.
1193     // In this case the isAuthorized field in AccessControlContext is also not
1194     // present.
1195     if (Universe::protection_domain_implies_method() == NULL) {
1196       return true;
1197     }
1198 
1199     // Whitelist certain access control contexts
1200     if (java_security_AccessControlContext::is_authorized(context)) {
1201       return true;
1202     }
1203 
1204     oop prot = klass->protection_domain();
1205     if (prot != NULL) {
1206       // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1207       // in the new wrapper.
1208       methodHandle m(THREAD, Universe::protection_domain_implies_method());
1209       Handle h_prot(THREAD, prot);
1210       JavaValue result(T_BOOLEAN);
1211       JavaCallArguments args(h_prot);
1212       JavaCalls::call(&result, m, &args, CHECK_false);
1213       return (result.get_jboolean() != 0);
1214     }
1215   }
1216   return true;
1217 }
1218 
1219 // Create an AccessControlContext with a protection domain with null codesource
1220 // and null permissions - which gives no permissions.
1221 oop create_dummy_access_control_context(TRAPS) {
1222   InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1223   Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1224   // Call constructor ProtectionDomain(null, null);
1225   JavaValue result(T_VOID);
1226   JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1227                           vmSymbols::object_initializer_name(),
1228                           vmSymbols::codesource_permissioncollection_signature(),
1229                           Handle(), Handle(), CHECK_NULL);
1230 
1231   // new ProtectionDomain[] {pd};
1232   objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1233   context->obj_at_put(0, obj());
1234 
1235   // new AccessControlContext(new ProtectionDomain[] {pd})
1236   objArrayHandle h_context(THREAD, context);
1237   oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1238   return acc;
1239 }
1240 
1241 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1242   JVMWrapper("JVM_DoPrivileged");
1243 
1244   if (action == NULL) {
1245     THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1246   }
1247 
1248   // Compute the frame initiating the do privileged operation and setup the privileged stack
1249   vframeStream vfst(thread);
1250   vfst.security_get_caller_frame(1);
1251 
1252   if (vfst.at_end()) {
1253     THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1254   }
1255 
1256   Method* method        = vfst.method();
1257   instanceKlassHandle klass (THREAD, method->method_holder());
1258 
1259   // Check that action object understands "Object run()"
1260   Handle h_context;
1261   if (context != NULL) {
1262     h_context = Handle(THREAD, JNIHandles::resolve(context));
1263     bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1264     if (!authorized) {
1265       // Create an unprivileged access control object and call it's run function
1266       // instead.
1267       oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1268       h_context = Handle(THREAD, noprivs);
1269     }
1270   }
1271 
1272   // Check that action object understands "Object run()"
1273   Handle object (THREAD, JNIHandles::resolve(action));
1274 
1275   // get run() method
1276   Method* m_oop = object->klass()->uncached_lookup_method(
1277                                            vmSymbols::run_method_name(),
1278                                            vmSymbols::void_object_signature(),
1279                                            Klass::find_overpass);
1280   methodHandle m (THREAD, m_oop);
1281   if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1282     THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1283   }
1284 
1285   // Stack allocated list of privileged stack elements
1286   PrivilegedElement pi;
1287   if (!vfst.at_end()) {
1288     pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1289     thread->set_privileged_stack_top(&pi);
1290   }
1291 
1292 
1293   // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1294   // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1295   Handle pending_exception;
1296   JavaValue result(T_OBJECT);
1297   JavaCallArguments args(object);
1298   JavaCalls::call(&result, m, &args, THREAD);
1299 
1300   // done with action, remove ourselves from the list
1301   if (!vfst.at_end()) {
1302     assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1303     thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1304   }
1305 
1306   if (HAS_PENDING_EXCEPTION) {
1307     pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1308     CLEAR_PENDING_EXCEPTION;
1309     // JVMTI has already reported the pending exception
1310     // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1311     if (THREAD->is_Java_thread()) {
1312       JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1313     }
1314     if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1315         !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1316       // Throw a java.security.PrivilegedActionException(Exception e) exception
1317       JavaCallArguments args(pending_exception);
1318       THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1319                   vmSymbols::exception_void_signature(),
1320                   &args);
1321     }
1322   }
1323 
1324   if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1325   return JNIHandles::make_local(env, (oop) result.get_jobject());
1326 JVM_END
1327 
1328 
1329 // Returns the inherited_access_control_context field of the running thread.
1330 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1331   JVMWrapper("JVM_GetInheritedAccessControlContext");
1332   oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1333   return JNIHandles::make_local(env, result);
1334 JVM_END
1335 
1336 class RegisterArrayForGC {
1337  private:
1338   JavaThread *_thread;
1339  public:
1340   RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array)  {
1341     _thread = thread;
1342     _thread->register_array_for_gc(array);
1343   }
1344 
1345   ~RegisterArrayForGC() {
1346     _thread->register_array_for_gc(NULL);
1347   }
1348 };
1349 
1350 
1351 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1352   JVMWrapper("JVM_GetStackAccessControlContext");
1353   if (!UsePrivilegedStack) return NULL;
1354 
1355   ResourceMark rm(THREAD);
1356   GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1357   JvmtiVMObjectAllocEventCollector oam;
1358 
1359   // count the protection domains on the execution stack. We collapse
1360   // duplicate consecutive protection domains into a single one, as
1361   // well as stopping when we hit a privileged frame.
1362 
1363   // Use vframeStream to iterate through Java frames
1364   vframeStream vfst(thread);
1365 
1366   oop previous_protection_domain = NULL;
1367   Handle privileged_context(thread, NULL);
1368   bool is_privileged = false;
1369   oop protection_domain = NULL;
1370 
1371   for(; !vfst.at_end(); vfst.next()) {
1372     // get method of frame
1373     Method* method = vfst.method();
1374     intptr_t* frame_id   = vfst.frame_id();
1375 
1376     // check the privileged frames to see if we have a match
1377     if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1378       // this frame is privileged
1379       is_privileged = true;
1380       privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1381       protection_domain  = thread->privileged_stack_top()->protection_domain();
1382     } else {
1383       protection_domain = method->method_holder()->protection_domain();
1384     }
1385 
1386     if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1387       local_array->push(protection_domain);
1388       previous_protection_domain = protection_domain;
1389     }
1390 
1391     if (is_privileged) break;
1392   }
1393 
1394 
1395   // either all the domains on the stack were system domains, or
1396   // we had a privileged system domain
1397   if (local_array->is_empty()) {
1398     if (is_privileged && privileged_context.is_null()) return NULL;
1399 
1400     oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1401     return JNIHandles::make_local(env, result);
1402   }
1403 
1404   // the resource area must be registered in case of a gc
1405   RegisterArrayForGC ragc(thread, local_array);
1406   objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1407                                                  local_array->length(), CHECK_NULL);
1408   objArrayHandle h_context(thread, context);
1409   for (int index = 0; index < local_array->length(); index++) {
1410     h_context->obj_at_put(index, local_array->at(index));
1411   }
1412 
1413   oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1414 
1415   return JNIHandles::make_local(env, result);
1416 JVM_END
1417 
1418 
1419 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1420   JVMWrapper("JVM_IsArrayClass");
1421   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1422   return (k != NULL) && k->is_array_klass() ? true : false;
1423 JVM_END
1424 
1425 
1426 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1427   JVMWrapper("JVM_IsPrimitiveClass");
1428   oop mirror = JNIHandles::resolve_non_null(cls);
1429   return (jboolean) java_lang_Class::is_primitive(mirror);
1430 JVM_END
1431 
1432 
1433 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1434   JVMWrapper("JVM_GetClassModifiers");
1435   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1436     // Primitive type
1437     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1438   }
1439 
1440   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1441   debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1442   assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1443   return k->modifier_flags();
1444 JVM_END
1445 
1446 
1447 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1448 
1449 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1450   JvmtiVMObjectAllocEventCollector oam;
1451   // ofClass is a reference to a java_lang_Class object. The mirror object
1452   // of an InstanceKlass
1453 
1454   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1455       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1456     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1457     return (jobjectArray)JNIHandles::make_local(env, result);
1458   }
1459 
1460   instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1461   InnerClassesIterator iter(k);
1462 
1463   if (iter.length() == 0) {
1464     // Neither an inner nor outer class
1465     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1466     return (jobjectArray)JNIHandles::make_local(env, result);
1467   }
1468 
1469   // find inner class info
1470   constantPoolHandle cp(thread, k->constants());
1471   int length = iter.length();
1472 
1473   // Allocate temp. result array
1474   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1475   objArrayHandle result (THREAD, r);
1476   int members = 0;
1477 
1478   for (; !iter.done(); iter.next()) {
1479     int ioff = iter.inner_class_info_index();
1480     int ooff = iter.outer_class_info_index();
1481 
1482     if (ioff != 0 && ooff != 0) {
1483       // Check to see if the name matches the class we're looking for
1484       // before attempting to find the class.
1485       if (cp->klass_name_at_matches(k, ooff)) {
1486         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1487         if (outer_klass == k()) {
1488            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1489            instanceKlassHandle inner_klass (THREAD, ik);
1490 
1491            // Throws an exception if outer klass has not declared k as
1492            // an inner klass
1493            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1494 
1495            result->obj_at_put(members, inner_klass->java_mirror());
1496            members++;
1497         }
1498       }
1499     }
1500   }
1501 
1502   if (members != length) {
1503     // Return array of right length
1504     objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1505     for(int i = 0; i < members; i++) {
1506       res->obj_at_put(i, result->obj_at(i));
1507     }
1508     return (jobjectArray)JNIHandles::make_local(env, res);
1509   }
1510 
1511   return (jobjectArray)JNIHandles::make_local(env, result());
1512 JVM_END
1513 
1514 
1515 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1516 {
1517   // ofClass is a reference to a java_lang_Class object.
1518   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1519       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1520     return NULL;
1521   }
1522 
1523   bool inner_is_member = false;
1524   Klass* outer_klass
1525     = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1526                           )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1527   if (outer_klass == NULL)  return NULL;  // already a top-level class
1528   if (!inner_is_member)  return NULL;     // an anonymous class (inside a method)
1529   return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1530 }
1531 JVM_END
1532 
1533 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1534 {
1535   oop mirror = JNIHandles::resolve_non_null(cls);
1536   if (java_lang_Class::is_primitive(mirror) ||
1537       !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1538     return NULL;
1539   }
1540   instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror)));
1541   int ooff = 0, noff = 0;
1542   if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
1543     if (noff != 0) {
1544       constantPoolHandle i_cp(thread, k->constants());
1545       Symbol* name = i_cp->symbol_at(noff);
1546       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1547       return (jstring) JNIHandles::make_local(env, str());
1548     }
1549   }
1550   return NULL;
1551 }
1552 JVM_END
1553 
1554 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1555   assert (cls != NULL, "illegal class");
1556   JVMWrapper("JVM_GetClassSignature");
1557   JvmtiVMObjectAllocEventCollector oam;
1558   ResourceMark rm(THREAD);
1559   // Return null for arrays and primatives
1560   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1561     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1562     if (k->is_instance_klass()) {
1563       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1564       if (sym == NULL) return NULL;
1565       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1566       return (jstring) JNIHandles::make_local(env, str());
1567     }
1568   }
1569   return NULL;
1570 JVM_END
1571 
1572 
1573 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1574   assert (cls != NULL, "illegal class");
1575   JVMWrapper("JVM_GetClassAnnotations");
1576 
1577   // Return null for arrays and primitives
1578   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1579     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1580     if (k->is_instance_klass()) {
1581       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1582       return (jbyteArray) JNIHandles::make_local(env, a);
1583     }
1584   }
1585   return NULL;
1586 JVM_END
1587 
1588 
1589 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1590   // some of this code was adapted from from jni_FromReflectedField
1591 
1592   oop reflected = JNIHandles::resolve_non_null(field);
1593   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1594   Klass* k    = java_lang_Class::as_Klass(mirror);
1595   int slot      = java_lang_reflect_Field::slot(reflected);
1596   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1597 
1598   KlassHandle kh(THREAD, k);
1599   intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1600 
1601   if (modifiers & JVM_ACC_STATIC) {
1602     // for static fields we only look in the current class
1603     if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1604       assert(false, "cannot find static field");
1605       return false;
1606     }
1607   } else {
1608     // for instance fields we start with the current class and work
1609     // our way up through the superclass chain
1610     if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1611       assert(false, "cannot find instance field");
1612       return false;
1613     }
1614   }
1615   return true;
1616 }
1617 
1618 static Method* jvm_get_method_common(jobject method) {
1619   // some of this code was adapted from from jni_FromReflectedMethod
1620 
1621   oop reflected = JNIHandles::resolve_non_null(method);
1622   oop mirror    = NULL;
1623   int slot      = 0;
1624 
1625   if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1626     mirror = java_lang_reflect_Constructor::clazz(reflected);
1627     slot   = java_lang_reflect_Constructor::slot(reflected);
1628   } else {
1629     assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1630            "wrong type");
1631     mirror = java_lang_reflect_Method::clazz(reflected);
1632     slot   = java_lang_reflect_Method::slot(reflected);
1633   }
1634   Klass* k = java_lang_Class::as_Klass(mirror);
1635 
1636   Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1637   assert(m != NULL, "cannot find method");
1638   return m;  // caller has to deal with NULL in product mode
1639 }
1640 
1641 /* Type use annotations support (JDK 1.8) */
1642 
1643 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1644   assert (cls != NULL, "illegal class");
1645   JVMWrapper("JVM_GetClassTypeAnnotations");
1646   ResourceMark rm(THREAD);
1647   // Return null for arrays and primitives
1648   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1649     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1650     if (k->is_instance_klass()) {
1651       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1652       if (type_annotations != NULL) {
1653         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1654         return (jbyteArray) JNIHandles::make_local(env, a);
1655       }
1656     }
1657   }
1658   return NULL;
1659 JVM_END
1660 
1661 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1662   assert (method != NULL, "illegal method");
1663   JVMWrapper("JVM_GetMethodTypeAnnotations");
1664 
1665   // method is a handle to a java.lang.reflect.Method object
1666   Method* m = jvm_get_method_common(method);
1667   if (m == NULL) {
1668     return NULL;
1669   }
1670 
1671   AnnotationArray* type_annotations = m->type_annotations();
1672   if (type_annotations != NULL) {
1673     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1674     return (jbyteArray) JNIHandles::make_local(env, a);
1675   }
1676 
1677   return NULL;
1678 JVM_END
1679 
1680 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1681   assert (field != NULL, "illegal field");
1682   JVMWrapper("JVM_GetFieldTypeAnnotations");
1683 
1684   fieldDescriptor fd;
1685   bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1686   if (!gotFd) {
1687     return NULL;
1688   }
1689 
1690   return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1691 JVM_END
1692 
1693 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1694   if (!cp->is_within_bounds(index)) {
1695     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1696   }
1697 }
1698 
1699 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1700 {
1701   JVMWrapper("JVM_GetMethodParameters");
1702   // method is a handle to a java.lang.reflect.Method object
1703   Method* method_ptr = jvm_get_method_common(method);
1704   methodHandle mh (THREAD, method_ptr);
1705   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1706   const int num_params = mh->method_parameters_length();
1707 
1708   if (num_params < 0) {
1709     // A -1 return value from method_parameters_length means there is no
1710     // parameter data.  Return null to indicate this to the reflection
1711     // API.
1712     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1713     return (jobjectArray)NULL;
1714   } else {
1715     // Otherwise, we return something up to reflection, even if it is
1716     // a zero-length array.  Why?  Because in some cases this can
1717     // trigger a MalformedParametersException.
1718 
1719     // make sure all the symbols are properly formatted
1720     for (int i = 0; i < num_params; i++) {
1721       MethodParametersElement* params = mh->method_parameters_start();
1722       int index = params[i].name_cp_index;
1723       bounds_check(mh->constants(), index, CHECK_NULL);
1724 
1725       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1726         THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1727                     "Wrong type at constant pool index");
1728       }
1729 
1730     }
1731 
1732     objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1733     objArrayHandle result (THREAD, result_oop);
1734 
1735     for (int i = 0; i < num_params; i++) {
1736       MethodParametersElement* params = mh->method_parameters_start();
1737       // For a 0 index, give a NULL symbol
1738       Symbol* sym = 0 != params[i].name_cp_index ?
1739         mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1740       int flags = params[i].flags;
1741       oop param = Reflection::new_parameter(reflected_method, i, sym,
1742                                             flags, CHECK_NULL);
1743       result->obj_at_put(i, param);
1744     }
1745     return (jobjectArray)JNIHandles::make_local(env, result());
1746   }
1747 }
1748 JVM_END
1749 
1750 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1751 
1752 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1753 {
1754   JVMWrapper("JVM_GetClassDeclaredFields");
1755   JvmtiVMObjectAllocEventCollector oam;
1756 
1757   // Exclude primitive types and array types
1758   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1759       java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1760     // Return empty array
1761     oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1762     return (jobjectArray) JNIHandles::make_local(env, res);
1763   }
1764 
1765   instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1766   constantPoolHandle cp(THREAD, k->constants());
1767 
1768   // Ensure class is linked
1769   k->link_class(CHECK_NULL);
1770 
1771   // Allocate result
1772   int num_fields;
1773 
1774   if (publicOnly) {
1775     num_fields = 0;
1776     for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1777       if (fs.access_flags().is_public()) ++num_fields;
1778     }
1779   } else {
1780     num_fields = k->java_fields_count();
1781   }
1782 
1783   objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1784   objArrayHandle result (THREAD, r);
1785 
1786   int out_idx = 0;
1787   fieldDescriptor fd;
1788   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1789     if (!publicOnly || fs.access_flags().is_public()) {
1790       fd.reinitialize(k(), fs.index());
1791       oop field = Reflection::new_field(&fd, CHECK_NULL);
1792       result->obj_at_put(out_idx, field);
1793       ++out_idx;
1794     }
1795   }
1796   assert(out_idx == num_fields, "just checking");
1797   return (jobjectArray) JNIHandles::make_local(env, result());
1798 }
1799 JVM_END
1800 
1801 static bool select_method(methodHandle method, bool want_constructor) {
1802   if (want_constructor) {
1803     return (method->is_initializer() && !method->is_static());
1804   } else {
1805     return  (!method->is_initializer() && !method->is_overpass());
1806   }
1807 }
1808 
1809 static jobjectArray get_class_declared_methods_helper(
1810                                   JNIEnv *env,
1811                                   jclass ofClass, jboolean publicOnly,
1812                                   bool want_constructor,
1813                                   Klass* klass, TRAPS) {
1814 
1815   JvmtiVMObjectAllocEventCollector oam;
1816 
1817   // Exclude primitive types and array types
1818   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1819       || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1820     // Return empty array
1821     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1822     return (jobjectArray) JNIHandles::make_local(env, res);
1823   }
1824 
1825   instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1826 
1827   // Ensure class is linked
1828   k->link_class(CHECK_NULL);
1829 
1830   Array<Method*>* methods = k->methods();
1831   int methods_length = methods->length();
1832 
1833   // Save original method_idnum in case of redefinition, which can change
1834   // the idnum of obsolete methods.  The new method will have the same idnum
1835   // but if we refresh the methods array, the counts will be wrong.
1836   ResourceMark rm(THREAD);
1837   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1838   int num_methods = 0;
1839 
1840   for (int i = 0; i < methods_length; i++) {
1841     methodHandle method(THREAD, methods->at(i));
1842     if (select_method(method, want_constructor)) {
1843       if (!publicOnly || method->is_public()) {
1844         idnums->push(method->method_idnum());
1845         ++num_methods;
1846       }
1847     }
1848   }
1849 
1850   // Allocate result
1851   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1852   objArrayHandle result (THREAD, r);
1853 
1854   // Now just put the methods that we selected above, but go by their idnum
1855   // in case of redefinition.  The methods can be redefined at any safepoint,
1856   // so above when allocating the oop array and below when creating reflect
1857   // objects.
1858   for (int i = 0; i < num_methods; i++) {
1859     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1860     if (method.is_null()) {
1861       // Method may have been deleted and seems this API can handle null
1862       // Otherwise should probably put a method that throws NSME
1863       result->obj_at_put(i, NULL);
1864     } else {
1865       oop m;
1866       if (want_constructor) {
1867         m = Reflection::new_constructor(method, CHECK_NULL);
1868       } else {
1869         m = Reflection::new_method(method, false, CHECK_NULL);
1870       }
1871       result->obj_at_put(i, m);
1872     }
1873   }
1874 
1875   return (jobjectArray) JNIHandles::make_local(env, result());
1876 }
1877 
1878 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1879 {
1880   JVMWrapper("JVM_GetClassDeclaredMethods");
1881   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1882                                            /*want_constructor*/ false,
1883                                            SystemDictionary::reflect_Method_klass(), THREAD);
1884 }
1885 JVM_END
1886 
1887 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1888 {
1889   JVMWrapper("JVM_GetClassDeclaredConstructors");
1890   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1891                                            /*want_constructor*/ true,
1892                                            SystemDictionary::reflect_Constructor_klass(), THREAD);
1893 }
1894 JVM_END
1895 
1896 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1897 {
1898   JVMWrapper("JVM_GetClassAccessFlags");
1899   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1900     // Primitive type
1901     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1902   }
1903 
1904   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1905   return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1906 }
1907 JVM_END
1908 
1909 
1910 // Constant pool access //////////////////////////////////////////////////////////
1911 
1912 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1913 {
1914   JVMWrapper("JVM_GetClassConstantPool");
1915   JvmtiVMObjectAllocEventCollector oam;
1916 
1917   // Return null for primitives and arrays
1918   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1919     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1920     if (k->is_instance_klass()) {
1921       instanceKlassHandle k_h(THREAD, k);
1922       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1923       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1924       return JNIHandles::make_local(jcp());
1925     }
1926   }
1927   return NULL;
1928 }
1929 JVM_END
1930 
1931 
1932 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1933 {
1934   JVMWrapper("JVM_ConstantPoolGetSize");
1935   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1936   return cp->length();
1937 }
1938 JVM_END
1939 
1940 
1941 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1942 {
1943   JVMWrapper("JVM_ConstantPoolGetClassAt");
1944   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1945   bounds_check(cp, index, CHECK_NULL);
1946   constantTag tag = cp->tag_at(index);
1947   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1948     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1949   }
1950   Klass* k = cp->klass_at(index, CHECK_NULL);
1951   return (jclass) JNIHandles::make_local(k->java_mirror());
1952 }
1953 JVM_END
1954 
1955 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1956 {
1957   JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1958   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1959   bounds_check(cp, index, CHECK_NULL);
1960   constantTag tag = cp->tag_at(index);
1961   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1962     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1963   }
1964   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1965   if (k == NULL) return NULL;
1966   return (jclass) JNIHandles::make_local(k->java_mirror());
1967 }
1968 JVM_END
1969 
1970 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1971   constantTag tag = cp->tag_at(index);
1972   if (!tag.is_method() && !tag.is_interface_method()) {
1973     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1974   }
1975   int klass_ref  = cp->uncached_klass_ref_index_at(index);
1976   Klass* k_o;
1977   if (force_resolution) {
1978     k_o = cp->klass_at(klass_ref, CHECK_NULL);
1979   } else {
1980     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1981     if (k_o == NULL) return NULL;
1982   }
1983   instanceKlassHandle k(THREAD, k_o);
1984   Symbol* name = cp->uncached_name_ref_at(index);
1985   Symbol* sig  = cp->uncached_signature_ref_at(index);
1986   methodHandle m (THREAD, k->find_method(name, sig));
1987   if (m.is_null()) {
1988     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1989   }
1990   oop method;
1991   if (!m->is_initializer() || m->is_static()) {
1992     method = Reflection::new_method(m, true, CHECK_NULL);
1993   } else {
1994     method = Reflection::new_constructor(m, CHECK_NULL);
1995   }
1996   return JNIHandles::make_local(method);
1997 }
1998 
1999 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2000 {
2001   JVMWrapper("JVM_ConstantPoolGetMethodAt");
2002   JvmtiVMObjectAllocEventCollector oam;
2003   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2004   bounds_check(cp, index, CHECK_NULL);
2005   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2006   return res;
2007 }
2008 JVM_END
2009 
2010 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2011 {
2012   JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2013   JvmtiVMObjectAllocEventCollector oam;
2014   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2015   bounds_check(cp, index, CHECK_NULL);
2016   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2017   return res;
2018 }
2019 JVM_END
2020 
2021 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2022   constantTag tag = cp->tag_at(index);
2023   if (!tag.is_field()) {
2024     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2025   }
2026   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2027   Klass* k_o;
2028   if (force_resolution) {
2029     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2030   } else {
2031     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2032     if (k_o == NULL) return NULL;
2033   }
2034   instanceKlassHandle k(THREAD, k_o);
2035   Symbol* name = cp->uncached_name_ref_at(index);
2036   Symbol* sig  = cp->uncached_signature_ref_at(index);
2037   fieldDescriptor fd;
2038   Klass* target_klass = k->find_field(name, sig, &fd);
2039   if (target_klass == NULL) {
2040     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2041   }
2042   oop field = Reflection::new_field(&fd, CHECK_NULL);
2043   return JNIHandles::make_local(field);
2044 }
2045 
2046 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2047 {
2048   JVMWrapper("JVM_ConstantPoolGetFieldAt");
2049   JvmtiVMObjectAllocEventCollector oam;
2050   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2051   bounds_check(cp, index, CHECK_NULL);
2052   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2053   return res;
2054 }
2055 JVM_END
2056 
2057 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2058 {
2059   JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2060   JvmtiVMObjectAllocEventCollector oam;
2061   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2062   bounds_check(cp, index, CHECK_NULL);
2063   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2064   return res;
2065 }
2066 JVM_END
2067 
2068 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2069 {
2070   JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2071   JvmtiVMObjectAllocEventCollector oam;
2072   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2073   bounds_check(cp, index, CHECK_NULL);
2074   constantTag tag = cp->tag_at(index);
2075   if (!tag.is_field_or_method()) {
2076     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2077   }
2078   int klass_ref = cp->uncached_klass_ref_index_at(index);
2079   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2080   Symbol*  member_name = cp->uncached_name_ref_at(index);
2081   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2082   objArrayOop  dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2083   objArrayHandle dest(THREAD, dest_o);
2084   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2085   dest->obj_at_put(0, str());
2086   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2087   dest->obj_at_put(1, str());
2088   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2089   dest->obj_at_put(2, str());
2090   return (jobjectArray) JNIHandles::make_local(dest());
2091 }
2092 JVM_END
2093 
2094 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2095 {
2096   JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2097   JvmtiVMObjectAllocEventCollector oam;
2098   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2099   bounds_check(cp, index, CHECK_0);
2100   constantTag tag = cp->tag_at(index);
2101   if (!tag.is_field_or_method()) {
2102     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2103   }
2104   return (jint) cp->uncached_klass_ref_index_at(index);
2105 }
2106 JVM_END
2107 
2108 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2109 {
2110   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2111   JvmtiVMObjectAllocEventCollector oam;
2112   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2113   bounds_check(cp, index, CHECK_0);
2114   constantTag tag = cp->tag_at(index);
2115   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2116     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2117   }
2118   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2119 }
2120 JVM_END
2121 
2122 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2123 {
2124   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2125   JvmtiVMObjectAllocEventCollector oam;
2126   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2127   bounds_check(cp, index, CHECK_NULL);
2128   constantTag tag = cp->tag_at(index);
2129   if (!tag.is_name_and_type()) {
2130     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2131   }
2132   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2133   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2134   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2135   objArrayHandle dest(THREAD, dest_o);
2136   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2137   dest->obj_at_put(0, str());
2138   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2139   dest->obj_at_put(1, str());
2140   return (jobjectArray) JNIHandles::make_local(dest());
2141 }
2142 JVM_END
2143 
2144 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2145 {
2146   JVMWrapper("JVM_ConstantPoolGetIntAt");
2147   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2148   bounds_check(cp, index, CHECK_0);
2149   constantTag tag = cp->tag_at(index);
2150   if (!tag.is_int()) {
2151     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2152   }
2153   return cp->int_at(index);
2154 }
2155 JVM_END
2156 
2157 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2158 {
2159   JVMWrapper("JVM_ConstantPoolGetLongAt");
2160   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2161   bounds_check(cp, index, CHECK_(0L));
2162   constantTag tag = cp->tag_at(index);
2163   if (!tag.is_long()) {
2164     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2165   }
2166   return cp->long_at(index);
2167 }
2168 JVM_END
2169 
2170 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2171 {
2172   JVMWrapper("JVM_ConstantPoolGetFloatAt");
2173   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2174   bounds_check(cp, index, CHECK_(0.0f));
2175   constantTag tag = cp->tag_at(index);
2176   if (!tag.is_float()) {
2177     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2178   }
2179   return cp->float_at(index);
2180 }
2181 JVM_END
2182 
2183 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2184 {
2185   JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2186   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2187   bounds_check(cp, index, CHECK_(0.0));
2188   constantTag tag = cp->tag_at(index);
2189   if (!tag.is_double()) {
2190     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2191   }
2192   return cp->double_at(index);
2193 }
2194 JVM_END
2195 
2196 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2197 {
2198   JVMWrapper("JVM_ConstantPoolGetStringAt");
2199   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2200   bounds_check(cp, index, CHECK_NULL);
2201   constantTag tag = cp->tag_at(index);
2202   if (!tag.is_string()) {
2203     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2204   }
2205   oop str = cp->string_at(index, CHECK_NULL);
2206   return (jstring) JNIHandles::make_local(str);
2207 }
2208 JVM_END
2209 
2210 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2211 {
2212   JVMWrapper("JVM_ConstantPoolGetUTF8At");
2213   JvmtiVMObjectAllocEventCollector oam;
2214   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2215   bounds_check(cp, index, CHECK_NULL);
2216   constantTag tag = cp->tag_at(index);
2217   if (!tag.is_symbol()) {
2218     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2219   }
2220   Symbol* sym = cp->symbol_at(index);
2221   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2222   return (jstring) JNIHandles::make_local(str());
2223 }
2224 JVM_END
2225 
2226 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2227 {
2228   JVMWrapper("JVM_ConstantPoolGetTagAt");
2229   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2230   bounds_check(cp, index, CHECK_0);
2231   constantTag tag = cp->tag_at(index);
2232   jbyte result = tag.value();
2233   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2234   // they are changed to the corresponding tags from the JVM spec, so that java code in
2235   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2236   if (tag.is_klass_or_reference()) {
2237       result = JVM_CONSTANT_Class;
2238   } else if (tag.is_string_index()) {
2239       result = JVM_CONSTANT_String;
2240   } else if (tag.is_method_type_in_error()) {
2241       result = JVM_CONSTANT_MethodType;
2242   } else if (tag.is_method_handle_in_error()) {
2243       result = JVM_CONSTANT_MethodHandle;
2244   }
2245   return result;
2246 }
2247 JVM_END
2248 
2249 // Assertion support. //////////////////////////////////////////////////////////
2250 
2251 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2252   JVMWrapper("JVM_DesiredAssertionStatus");
2253   assert(cls != NULL, "bad class");
2254 
2255   oop r = JNIHandles::resolve(cls);
2256   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2257   if (java_lang_Class::is_primitive(r)) return false;
2258 
2259   Klass* k = java_lang_Class::as_Klass(r);
2260   assert(k->is_instance_klass(), "must be an instance klass");
2261   if (!k->is_instance_klass()) return false;
2262 
2263   ResourceMark rm(THREAD);
2264   const char* name = k->name()->as_C_string();
2265   bool system_class = k->class_loader() == NULL;
2266   return JavaAssertions::enabled(name, system_class);
2267 
2268 JVM_END
2269 
2270 
2271 // Return a new AssertionStatusDirectives object with the fields filled in with
2272 // command-line assertion arguments (i.e., -ea, -da).
2273 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2274   JVMWrapper("JVM_AssertionStatusDirectives");
2275   JvmtiVMObjectAllocEventCollector oam;
2276   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2277   return JNIHandles::make_local(env, asd);
2278 JVM_END
2279 
2280 // Verification ////////////////////////////////////////////////////////////////////////////////
2281 
2282 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2283 
2284 // RedefineClasses support: bug 6214132 caused verification to fail.
2285 // All functions from this section should call the jvmtiThreadSate function:
2286 //   Klass* class_to_verify_considering_redefinition(Klass* klass).
2287 // The function returns a Klass* of the _scratch_class if the verifier
2288 // was invoked in the middle of the class redefinition.
2289 // Otherwise it returns its argument value which is the _the_class Klass*.
2290 // Please, refer to the description in the jvmtiThreadSate.hpp.
2291 
2292 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2293   JVMWrapper("JVM_GetClassNameUTF");
2294   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2295   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2296   return k->name()->as_utf8();
2297 JVM_END
2298 
2299 
2300 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2301   JVMWrapper("JVM_GetClassCPTypes");
2302   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2303   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2304   // types will have length zero if this is not an InstanceKlass
2305   // (length is determined by call to JVM_GetClassCPEntriesCount)
2306   if (k->is_instance_klass()) {
2307     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2308     for (int index = cp->length() - 1; index >= 0; index--) {
2309       constantTag tag = cp->tag_at(index);
2310       types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2311     }
2312   }
2313 JVM_END
2314 
2315 
2316 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2317   JVMWrapper("JVM_GetClassCPEntriesCount");
2318   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2319   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2320   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2321 JVM_END
2322 
2323 
2324 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2325   JVMWrapper("JVM_GetClassFieldsCount");
2326   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2327   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2328   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2329 JVM_END
2330 
2331 
2332 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2333   JVMWrapper("JVM_GetClassMethodsCount");
2334   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2335   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2336   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2337 JVM_END
2338 
2339 
2340 // The following methods, used for the verifier, are never called with
2341 // array klasses, so a direct cast to InstanceKlass is safe.
2342 // Typically, these methods are called in a loop with bounds determined
2343 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2344 // zero for arrays.
2345 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2346   JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2347   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2348   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2349   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2350   int length = method->checked_exceptions_length();
2351   if (length > 0) {
2352     CheckedExceptionElement* table= method->checked_exceptions_start();
2353     for (int i = 0; i < length; i++) {
2354       exceptions[i] = table[i].class_cp_index;
2355     }
2356   }
2357 JVM_END
2358 
2359 
2360 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2361   JVMWrapper("JVM_GetMethodIxExceptionsCount");
2362   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2363   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2364   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2365   return method->checked_exceptions_length();
2366 JVM_END
2367 
2368 
2369 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2370   JVMWrapper("JVM_GetMethodIxByteCode");
2371   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2372   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2373   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2374   memcpy(code, method->code_base(), method->code_size());
2375 JVM_END
2376 
2377 
2378 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2379   JVMWrapper("JVM_GetMethodIxByteCodeLength");
2380   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2381   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2382   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2383   return method->code_size();
2384 JVM_END
2385 
2386 
2387 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2388   JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2389   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2390   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2391   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2392   ExceptionTable extable(method);
2393   entry->start_pc   = extable.start_pc(entry_index);
2394   entry->end_pc     = extable.end_pc(entry_index);
2395   entry->handler_pc = extable.handler_pc(entry_index);
2396   entry->catchType  = extable.catch_type_index(entry_index);
2397 JVM_END
2398 
2399 
2400 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2401   JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2402   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2403   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2404   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2405   return method->exception_table_length();
2406 JVM_END
2407 
2408 
2409 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2410   JVMWrapper("JVM_GetMethodIxModifiers");
2411   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2412   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2413   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2414   return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2415 JVM_END
2416 
2417 
2418 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2419   JVMWrapper("JVM_GetFieldIxModifiers");
2420   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2421   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2422   return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2423 JVM_END
2424 
2425 
2426 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2427   JVMWrapper("JVM_GetMethodIxLocalsCount");
2428   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2429   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2430   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2431   return method->max_locals();
2432 JVM_END
2433 
2434 
2435 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2436   JVMWrapper("JVM_GetMethodIxArgsSize");
2437   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2438   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2439   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2440   return method->size_of_parameters();
2441 JVM_END
2442 
2443 
2444 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2445   JVMWrapper("JVM_GetMethodIxMaxStack");
2446   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2447   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2448   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2449   return method->verifier_max_stack();
2450 JVM_END
2451 
2452 
2453 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2454   JVMWrapper("JVM_IsConstructorIx");
2455   ResourceMark rm(THREAD);
2456   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2457   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2458   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2459   return method->name() == vmSymbols::object_initializer_name();
2460 JVM_END
2461 
2462 
2463 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2464   JVMWrapper("JVM_IsVMGeneratedMethodIx");
2465   ResourceMark rm(THREAD);
2466   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2467   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2468   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2469   return method->is_overpass();
2470 JVM_END
2471 
2472 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2473   JVMWrapper("JVM_GetMethodIxIxUTF");
2474   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2475   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2476   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2477   return method->name()->as_utf8();
2478 JVM_END
2479 
2480 
2481 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2482   JVMWrapper("JVM_GetMethodIxSignatureUTF");
2483   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2484   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2485   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2486   return method->signature()->as_utf8();
2487 JVM_END
2488 
2489 /**
2490  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2491  * read entries in the constant pool.  Since the old verifier always
2492  * works on a copy of the code, it will not see any rewriting that
2493  * may possibly occur in the middle of verification.  So it is important
2494  * that nothing it calls tries to use the cpCache instead of the raw
2495  * constant pool, so we must use cp->uncached_x methods when appropriate.
2496  */
2497 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2498   JVMWrapper("JVM_GetCPFieldNameUTF");
2499   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2500   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2501   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2502   switch (cp->tag_at(cp_index).value()) {
2503     case JVM_CONSTANT_Fieldref:
2504       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2505     default:
2506       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2507   }
2508   ShouldNotReachHere();
2509   return NULL;
2510 JVM_END
2511 
2512 
2513 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2514   JVMWrapper("JVM_GetCPMethodNameUTF");
2515   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2516   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2517   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2518   switch (cp->tag_at(cp_index).value()) {
2519     case JVM_CONSTANT_InterfaceMethodref:
2520     case JVM_CONSTANT_Methodref:
2521       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2522     default:
2523       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2524   }
2525   ShouldNotReachHere();
2526   return NULL;
2527 JVM_END
2528 
2529 
2530 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2531   JVMWrapper("JVM_GetCPMethodSignatureUTF");
2532   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2533   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2534   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2535   switch (cp->tag_at(cp_index).value()) {
2536     case JVM_CONSTANT_InterfaceMethodref:
2537     case JVM_CONSTANT_Methodref:
2538       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2539     default:
2540       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2541   }
2542   ShouldNotReachHere();
2543   return NULL;
2544 JVM_END
2545 
2546 
2547 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2548   JVMWrapper("JVM_GetCPFieldSignatureUTF");
2549   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2550   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2551   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2552   switch (cp->tag_at(cp_index).value()) {
2553     case JVM_CONSTANT_Fieldref:
2554       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2555     default:
2556       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2557   }
2558   ShouldNotReachHere();
2559   return NULL;
2560 JVM_END
2561 
2562 
2563 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2564   JVMWrapper("JVM_GetCPClassNameUTF");
2565   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2566   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2567   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2568   Symbol* classname = cp->klass_name_at(cp_index);
2569   return classname->as_utf8();
2570 JVM_END
2571 
2572 
2573 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2574   JVMWrapper("JVM_GetCPFieldClassNameUTF");
2575   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2576   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2577   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2578   switch (cp->tag_at(cp_index).value()) {
2579     case JVM_CONSTANT_Fieldref: {
2580       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2581       Symbol* classname = cp->klass_name_at(class_index);
2582       return classname->as_utf8();
2583     }
2584     default:
2585       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2586   }
2587   ShouldNotReachHere();
2588   return NULL;
2589 JVM_END
2590 
2591 
2592 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2593   JVMWrapper("JVM_GetCPMethodClassNameUTF");
2594   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2595   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2596   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2597   switch (cp->tag_at(cp_index).value()) {
2598     case JVM_CONSTANT_Methodref:
2599     case JVM_CONSTANT_InterfaceMethodref: {
2600       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2601       Symbol* classname = cp->klass_name_at(class_index);
2602       return classname->as_utf8();
2603     }
2604     default:
2605       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2606   }
2607   ShouldNotReachHere();
2608   return NULL;
2609 JVM_END
2610 
2611 
2612 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2613   JVMWrapper("JVM_GetCPFieldModifiers");
2614   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2615   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2616   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2617   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2618   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2619   ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2620   switch (cp->tag_at(cp_index).value()) {
2621     case JVM_CONSTANT_Fieldref: {
2622       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2623       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2624       for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2625         if (fs.name() == name && fs.signature() == signature) {
2626           return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2627         }
2628       }
2629       return -1;
2630     }
2631     default:
2632       fatal("JVM_GetCPFieldModifiers: illegal constant");
2633   }
2634   ShouldNotReachHere();
2635   return 0;
2636 JVM_END
2637 
2638 
2639 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2640   JVMWrapper("JVM_GetCPMethodModifiers");
2641   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2642   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2643   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2644   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2645   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2646   switch (cp->tag_at(cp_index).value()) {
2647     case JVM_CONSTANT_Methodref:
2648     case JVM_CONSTANT_InterfaceMethodref: {
2649       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2650       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2651       Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2652       int methods_count = methods->length();
2653       for (int i = 0; i < methods_count; i++) {
2654         Method* method = methods->at(i);
2655         if (method->name() == name && method->signature() == signature) {
2656             return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2657         }
2658       }
2659       return -1;
2660     }
2661     default:
2662       fatal("JVM_GetCPMethodModifiers: illegal constant");
2663   }
2664   ShouldNotReachHere();
2665   return 0;
2666 JVM_END
2667 
2668 
2669 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2670 
2671 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2672   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2673 JVM_END
2674 
2675 
2676 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2677   JVMWrapper("JVM_IsSameClassPackage");
2678   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2679   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2680   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2681   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2682   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2683 JVM_END
2684 
2685 // Printing support //////////////////////////////////////////////////
2686 extern "C" {
2687 
2688 ATTRIBUTE_PRINTF(3, 0)
2689 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2690   // see bug 4399518, 4417214
2691   if ((intptr_t)count <= 0) return -1;
2692 
2693   int result = vsnprintf(str, count, fmt, args);
2694   // Note: on truncation vsnprintf(3) on Unix returns numbers of
2695   // characters which would have been written had the buffer been large
2696   // enough; on Windows, it returns -1. We handle both cases here and
2697   // always return -1, and perform null termination.
2698   if ((result > 0 && (size_t)result >= count) || result == -1) {
2699     str[count - 1] = '\0';
2700     result = -1;
2701   }
2702 
2703   return result;
2704 }
2705 
2706 ATTRIBUTE_PRINTF(3, 0)
2707 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2708   va_list args;
2709   int len;
2710   va_start(args, fmt);
2711   len = jio_vsnprintf(str, count, fmt, args);
2712   va_end(args);
2713   return len;
2714 }
2715 
2716 ATTRIBUTE_PRINTF(2,3)
2717 int jio_fprintf(FILE* f, const char *fmt, ...) {
2718   int len;
2719   va_list args;
2720   va_start(args, fmt);
2721   len = jio_vfprintf(f, fmt, args);
2722   va_end(args);
2723   return len;
2724 }
2725 
2726 ATTRIBUTE_PRINTF(2, 0)
2727 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2728   if (Arguments::vfprintf_hook() != NULL) {
2729      return Arguments::vfprintf_hook()(f, fmt, args);
2730   } else {
2731     return vfprintf(f, fmt, args);
2732   }
2733 }
2734 
2735 ATTRIBUTE_PRINTF(1, 2)
2736 JNIEXPORT int jio_printf(const char *fmt, ...) {
2737   int len;
2738   va_list args;
2739   va_start(args, fmt);
2740   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2741   va_end(args);
2742   return len;
2743 }
2744 
2745 
2746 // HotSpot specific jio method
2747 void jio_print(const char* s) {
2748   // Try to make this function as atomic as possible.
2749   if (Arguments::vfprintf_hook() != NULL) {
2750     jio_fprintf(defaultStream::output_stream(), "%s", s);
2751   } else {
2752     // Make an unused local variable to avoid warning from gcc 4.x compiler.
2753     size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2754   }
2755 }
2756 
2757 } // Extern C
2758 
2759 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2760 
2761 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2762 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2763 // OSThread objects.  The exception to this rule is when the target object is the thread
2764 // doing the operation, in which case we know that the thread won't exit until the
2765 // operation is done (all exits being voluntary).  There are a few cases where it is
2766 // rather silly to do operations on yourself, like resuming yourself or asking whether
2767 // you are alive.  While these can still happen, they are not subject to deadlocks if
2768 // the lock is held while the operation occurs (this is not the case for suspend, for
2769 // instance), and are very unlikely.  Because IsAlive needs to be fast and its
2770 // implementation is local to this file, we always lock Threads_lock for that one.
2771 
2772 static void thread_entry(JavaThread* thread, TRAPS) {
2773   HandleMark hm(THREAD);
2774   Handle obj(THREAD, thread->threadObj());
2775   JavaValue result(T_VOID);
2776   JavaCalls::call_virtual(&result,
2777                           obj,
2778                           KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2779                           vmSymbols::run_method_name(),
2780                           vmSymbols::void_method_signature(),
2781                           THREAD);
2782 }
2783 
2784 
2785 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2786   JVMWrapper("JVM_StartThread");
2787   JavaThread *native_thread = NULL;
2788 
2789   // We cannot hold the Threads_lock when we throw an exception,
2790   // due to rank ordering issues. Example:  we might need to grab the
2791   // Heap_lock while we construct the exception.
2792   bool throw_illegal_thread_state = false;
2793 
2794   // We must release the Threads_lock before we can post a jvmti event
2795   // in Thread::start.
2796   {
2797     // Ensure that the C++ Thread and OSThread structures aren't freed before
2798     // we operate.
2799     MutexLocker mu(Threads_lock);
2800 
2801     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2802     // re-starting an already started thread, so we should usually find
2803     // that the JavaThread is null. However for a JNI attached thread
2804     // there is a small window between the Thread object being created
2805     // (with its JavaThread set) and the update to its threadStatus, so we
2806     // have to check for this
2807     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2808       throw_illegal_thread_state = true;
2809     } else {
2810       // We could also check the stillborn flag to see if this thread was already stopped, but
2811       // for historical reasons we let the thread detect that itself when it starts running
2812 
2813       jlong size =
2814              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2815       // Allocate the C++ Thread structure and create the native thread.  The
2816       // stack size retrieved from java is signed, but the constructor takes
2817       // size_t (an unsigned type), so avoid passing negative values which would
2818       // result in really large stacks.
2819       size_t sz = size > 0 ? (size_t) size : 0;
2820       native_thread = new JavaThread(&thread_entry, sz);
2821 
2822       // At this point it may be possible that no osthread was created for the
2823       // JavaThread due to lack of memory. Check for this situation and throw
2824       // an exception if necessary. Eventually we may want to change this so
2825       // that we only grab the lock if the thread was created successfully -
2826       // then we can also do this check and throw the exception in the
2827       // JavaThread constructor.
2828       if (native_thread->osthread() != NULL) {
2829         // Note: the current thread is not being used within "prepare".
2830         native_thread->prepare(jthread);
2831       }
2832     }
2833   }
2834 
2835   if (throw_illegal_thread_state) {
2836     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2837   }
2838 
2839   assert(native_thread != NULL, "Starting null thread?");
2840 
2841   if (native_thread->osthread() == NULL) {
2842     // No one should hold a reference to the 'native_thread'.
2843     delete native_thread;
2844     if (JvmtiExport::should_post_resource_exhausted()) {
2845       JvmtiExport::post_resource_exhausted(
2846         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2847         os::native_thread_creation_failed_msg());
2848     }
2849     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2850               os::native_thread_creation_failed_msg());
2851   }
2852 
2853   Thread::start(native_thread);
2854 
2855 JVM_END
2856 
2857 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2858 // before the quasi-asynchronous exception is delivered.  This is a little obtrusive,
2859 // but is thought to be reliable and simple. In the case, where the receiver is the
2860 // same thread as the sender, no safepoint is needed.
2861 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2862   JVMWrapper("JVM_StopThread");
2863 
2864   oop java_throwable = JNIHandles::resolve(throwable);
2865   if (java_throwable == NULL) {
2866     THROW(vmSymbols::java_lang_NullPointerException());
2867   }
2868   oop java_thread = JNIHandles::resolve_non_null(jthread);
2869   JavaThread* receiver = java_lang_Thread::thread(java_thread);
2870   Events::log_exception(JavaThread::current(),
2871                         "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2872                         p2i(receiver), p2i((address)java_thread), p2i(throwable));
2873   // First check if thread is alive
2874   if (receiver != NULL) {
2875     // Check if exception is getting thrown at self (use oop equality, since the
2876     // target object might exit)
2877     if (java_thread == thread->threadObj()) {
2878       THROW_OOP(java_throwable);
2879     } else {
2880       // Enques a VM_Operation to stop all threads and then deliver the exception...
2881       Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2882     }
2883   }
2884   else {
2885     // Either:
2886     // - target thread has not been started before being stopped, or
2887     // - target thread already terminated
2888     // We could read the threadStatus to determine which case it is
2889     // but that is overkill as it doesn't matter. We must set the
2890     // stillborn flag for the first case, and if the thread has already
2891     // exited setting this flag has no affect
2892     java_lang_Thread::set_stillborn(java_thread);
2893   }
2894 JVM_END
2895 
2896 
2897 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2898   JVMWrapper("JVM_IsThreadAlive");
2899 
2900   oop thread_oop = JNIHandles::resolve_non_null(jthread);
2901   return java_lang_Thread::is_alive(thread_oop);
2902 JVM_END
2903 
2904 
2905 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2906   JVMWrapper("JVM_SuspendThread");
2907   oop java_thread = JNIHandles::resolve_non_null(jthread);
2908   JavaThread* receiver = java_lang_Thread::thread(java_thread);
2909 
2910   if (receiver != NULL) {
2911     // thread has run and has not exited (still on threads list)
2912 
2913     {
2914       MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2915       if (receiver->is_external_suspend()) {
2916         // Don't allow nested external suspend requests. We can't return
2917         // an error from this interface so just ignore the problem.
2918         return;
2919       }
2920       if (receiver->is_exiting()) { // thread is in the process of exiting
2921         return;
2922       }
2923       receiver->set_external_suspend();
2924     }
2925 
2926     // java_suspend() will catch threads in the process of exiting
2927     // and will ignore them.
2928     receiver->java_suspend();
2929 
2930     // It would be nice to have the following assertion in all the
2931     // time, but it is possible for a racing resume request to have
2932     // resumed this thread right after we suspended it. Temporarily
2933     // enable this assertion if you are chasing a different kind of
2934     // bug.
2935     //
2936     // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2937     //   receiver->is_being_ext_suspended(), "thread is not suspended");
2938   }
2939 JVM_END
2940 
2941 
2942 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2943   JVMWrapper("JVM_ResumeThread");
2944   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2945   // We need to *always* get the threads lock here, since this operation cannot be allowed during
2946   // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2947   // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2948   // looks at it.
2949   MutexLocker ml(Threads_lock);
2950   JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2951   if (thr != NULL) {
2952     // the thread has run and is not in the process of exiting
2953     thr->java_resume();
2954   }
2955 JVM_END
2956 
2957 
2958 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2959   JVMWrapper("JVM_SetThreadPriority");
2960   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2961   MutexLocker ml(Threads_lock);
2962   oop java_thread = JNIHandles::resolve_non_null(jthread);
2963   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2964   JavaThread* thr = java_lang_Thread::thread(java_thread);
2965   if (thr != NULL) {                  // Thread not yet started; priority pushed down when it is
2966     Thread::set_priority(thr, (ThreadPriority)prio);
2967   }
2968 JVM_END
2969 
2970 
2971 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2972   JVMWrapper("JVM_Yield");
2973   if (os::dont_yield()) return;
2974   HOTSPOT_THREAD_YIELD();
2975 
2976   // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2977   // Critical for similar threading behaviour
2978   if (ConvertYieldToSleep) {
2979     os::sleep(thread, MinSleepInterval, false);
2980   } else {
2981     os::naked_yield();
2982   }
2983 JVM_END
2984 
2985 
2986 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2987   JVMWrapper("JVM_Sleep");
2988 
2989   if (millis < 0) {
2990     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2991   }
2992 
2993   if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2994     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2995   }
2996 
2997   // Save current thread state and restore it at the end of this block.
2998   // And set new thread state to SLEEPING.
2999   JavaThreadSleepState jtss(thread);
3000 
3001   HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3002 
3003   EventThreadSleep event;
3004 
3005   if (millis == 0) {
3006     // When ConvertSleepToYield is on, this matches the classic VM implementation of
3007     // JVM_Sleep. Critical for similar threading behaviour (Win32)
3008     // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
3009     // for SOLARIS
3010     if (ConvertSleepToYield) {
3011       os::naked_yield();
3012     } else {
3013       ThreadState old_state = thread->osthread()->get_state();
3014       thread->osthread()->set_state(SLEEPING);
3015       os::sleep(thread, MinSleepInterval, false);
3016       thread->osthread()->set_state(old_state);
3017     }
3018   } else {
3019     ThreadState old_state = thread->osthread()->get_state();
3020     thread->osthread()->set_state(SLEEPING);
3021     if (os::sleep(thread, millis, true) == OS_INTRPT) {
3022       // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3023       // us while we were sleeping. We do not overwrite those.
3024       if (!HAS_PENDING_EXCEPTION) {
3025         if (event.should_commit()) {
3026           event.set_time(millis);
3027           event.commit();
3028         }
3029         HOTSPOT_THREAD_SLEEP_END(1);
3030 
3031         // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3032         // to properly restore the thread state.  That's likely wrong.
3033         THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3034       }
3035     }
3036     thread->osthread()->set_state(old_state);
3037   }
3038   if (event.should_commit()) {
3039     event.set_time(millis);
3040     event.commit();
3041   }
3042   HOTSPOT_THREAD_SLEEP_END(0);
3043 JVM_END
3044 
3045 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3046   JVMWrapper("JVM_CurrentThread");
3047   oop jthread = thread->threadObj();
3048   assert (thread != NULL, "no current thread!");
3049   return JNIHandles::make_local(env, jthread);
3050 JVM_END
3051 
3052 
3053 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3054   JVMWrapper("JVM_CountStackFrames");
3055 
3056   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3057   oop java_thread = JNIHandles::resolve_non_null(jthread);
3058   bool throw_illegal_thread_state = false;
3059   int count = 0;
3060 
3061   {
3062     MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3063     // We need to re-resolve the java_thread, since a GC might have happened during the
3064     // acquire of the lock
3065     JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3066 
3067     if (thr == NULL) {
3068       // do nothing
3069     } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3070       // Check whether this java thread has been suspended already. If not, throws
3071       // IllegalThreadStateException. We defer to throw that exception until
3072       // Threads_lock is released since loading exception class has to leave VM.
3073       // The correct way to test a thread is actually suspended is
3074       // wait_for_ext_suspend_completion(), but we can't call that while holding
3075       // the Threads_lock. The above tests are sufficient for our purposes
3076       // provided the walkability of the stack is stable - which it isn't
3077       // 100% but close enough for most practical purposes.
3078       throw_illegal_thread_state = true;
3079     } else {
3080       // Count all java activation, i.e., number of vframes
3081       for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3082         // Native frames are not counted
3083         if (!vfst.method()->is_native()) count++;
3084        }
3085     }
3086   }
3087 
3088   if (throw_illegal_thread_state) {
3089     THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3090                 "this thread is not suspended");
3091   }
3092   return count;
3093 JVM_END
3094 
3095 // Consider: A better way to implement JVM_Interrupt() is to acquire
3096 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3097 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3098 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3099 // outside the critical section.  Threads_lock is hot so we want to minimize
3100 // the hold-time.  A cleaner interface would be to decompose interrupt into
3101 // two steps.  The 1st phase, performed under Threads_lock, would return
3102 // a closure that'd be invoked after Threads_lock was dropped.
3103 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3104 // admit spurious wakeups.
3105 
3106 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3107   JVMWrapper("JVM_Interrupt");
3108 
3109   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3110   oop java_thread = JNIHandles::resolve_non_null(jthread);
3111   MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3112   // We need to re-resolve the java_thread, since a GC might have happened during the
3113   // acquire of the lock
3114   JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3115   if (thr != NULL) {
3116     Thread::interrupt(thr);
3117   }
3118 JVM_END
3119 
3120 
3121 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3122   JVMWrapper("JVM_IsInterrupted");
3123 
3124   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3125   oop java_thread = JNIHandles::resolve_non_null(jthread);
3126   MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3127   // We need to re-resolve the java_thread, since a GC might have happened during the
3128   // acquire of the lock
3129   JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3130   if (thr == NULL) {
3131     return JNI_FALSE;
3132   } else {
3133     return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3134   }
3135 JVM_END
3136 
3137 
3138 // Return true iff the current thread has locked the object passed in
3139 
3140 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3141   JVMWrapper("JVM_HoldsLock");
3142   assert(THREAD->is_Java_thread(), "sanity check");
3143   if (obj == NULL) {
3144     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3145   }
3146   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3147   return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3148 JVM_END
3149 
3150 
3151 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3152   JVMWrapper("JVM_DumpAllStacks");
3153   VM_PrintThreads op;
3154   VMThread::execute(&op);
3155   if (JvmtiExport::should_post_data_dump()) {
3156     JvmtiExport::post_data_dump();
3157   }
3158 JVM_END
3159 
3160 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3161   JVMWrapper("JVM_SetNativeThreadName");
3162   ResourceMark rm(THREAD);
3163   oop java_thread = JNIHandles::resolve_non_null(jthread);
3164   JavaThread* thr = java_lang_Thread::thread(java_thread);
3165   // Thread naming only supported for the current thread, doesn't work for
3166   // target threads.
3167   if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3168     // we don't set the name of an attached thread to avoid stepping
3169     // on other programs
3170     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3171     os::set_native_thread_name(thread_name);
3172   }
3173 JVM_END
3174 
3175 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3176 
3177 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3178   assert(jthread->is_Java_thread(), "must be a Java thread");
3179   if (jthread->privileged_stack_top() == NULL) return false;
3180   if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3181     oop loader = jthread->privileged_stack_top()->class_loader();
3182     if (loader == NULL) return true;
3183     bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3184     if (trusted) return true;
3185   }
3186   return false;
3187 }
3188 
3189 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3190   JVMWrapper("JVM_CurrentLoadedClass");
3191   ResourceMark rm(THREAD);
3192 
3193   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3194     // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3195     bool trusted = is_trusted_frame(thread, &vfst);
3196     if (trusted) return NULL;
3197 
3198     Method* m = vfst.method();
3199     if (!m->is_native()) {
3200       InstanceKlass* holder = m->method_holder();
3201       oop loader = holder->class_loader();
3202       if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3203         return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3204       }
3205     }
3206   }
3207   return NULL;
3208 JVM_END
3209 
3210 
3211 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3212   JVMWrapper("JVM_CurrentClassLoader");
3213   ResourceMark rm(THREAD);
3214 
3215   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3216 
3217     // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3218     bool trusted = is_trusted_frame(thread, &vfst);
3219     if (trusted) return NULL;
3220 
3221     Method* m = vfst.method();
3222     if (!m->is_native()) {
3223       InstanceKlass* holder = m->method_holder();
3224       assert(holder->is_klass(), "just checking");
3225       oop loader = holder->class_loader();
3226       if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3227         return JNIHandles::make_local(env, loader);
3228       }
3229     }
3230   }
3231   return NULL;
3232 JVM_END
3233 
3234 
3235 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3236   JVMWrapper("JVM_GetClassContext");
3237   ResourceMark rm(THREAD);
3238   JvmtiVMObjectAllocEventCollector oam;
3239   vframeStream vfst(thread);
3240 
3241   if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3242     // This must only be called from SecurityManager.getClassContext
3243     Method* m = vfst.method();
3244     if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3245           m->name()          == vmSymbols::getClassContext_name() &&
3246           m->signature()     == vmSymbols::void_class_array_signature())) {
3247       THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3248     }
3249   }
3250 
3251   // Collect method holders
3252   GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3253   for (; !vfst.at_end(); vfst.security_next()) {
3254     Method* m = vfst.method();
3255     // Native frames are not returned
3256     if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3257       Klass* holder = m->method_holder();
3258       assert(holder->is_klass(), "just checking");
3259       klass_array->append(holder);
3260     }
3261   }
3262 
3263   // Create result array of type [Ljava/lang/Class;
3264   objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3265   // Fill in mirrors corresponding to method holders
3266   for (int i = 0; i < klass_array->length(); i++) {
3267     result->obj_at_put(i, klass_array->at(i)->java_mirror());
3268   }
3269 
3270   return (jobjectArray) JNIHandles::make_local(env, result);
3271 JVM_END
3272 
3273 
3274 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3275   JVMWrapper("JVM_ClassDepth");
3276   ResourceMark rm(THREAD);
3277   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3278   Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3279 
3280   const char* str = java_lang_String::as_utf8_string(class_name_str());
3281   TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3282   if (class_name_sym == NULL) {
3283     return -1;
3284   }
3285 
3286   int depth = 0;
3287 
3288   for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3289     if (!vfst.method()->is_native()) {
3290       InstanceKlass* holder = vfst.method()->method_holder();
3291       assert(holder->is_klass(), "just checking");
3292       if (holder->name() == class_name_sym) {
3293         return depth;
3294       }
3295       depth++;
3296     }
3297   }
3298   return -1;
3299 JVM_END
3300 
3301 
3302 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3303   JVMWrapper("JVM_ClassLoaderDepth");
3304   ResourceMark rm(THREAD);
3305   int depth = 0;
3306   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3307     // if a method in a class in a trusted loader is in a doPrivileged, return -1
3308     bool trusted = is_trusted_frame(thread, &vfst);
3309     if (trusted) return -1;
3310 
3311     Method* m = vfst.method();
3312     if (!m->is_native()) {
3313       InstanceKlass* holder = m->method_holder();
3314       assert(holder->is_klass(), "just checking");
3315       oop loader = holder->class_loader();
3316       if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3317         return depth;
3318       }
3319       depth++;
3320     }
3321   }
3322   return -1;
3323 JVM_END
3324 
3325 
3326 // java.lang.Package ////////////////////////////////////////////////////////////////
3327 
3328 
3329 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3330   JVMWrapper("JVM_GetSystemPackage");
3331   ResourceMark rm(THREAD);
3332   JvmtiVMObjectAllocEventCollector oam;
3333   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3334   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3335   return (jstring) JNIHandles::make_local(result);
3336 JVM_END
3337 
3338 
3339 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3340   JVMWrapper("JVM_GetSystemPackages");
3341   JvmtiVMObjectAllocEventCollector oam;
3342   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3343   return (jobjectArray) JNIHandles::make_local(result);
3344 JVM_END
3345 
3346 
3347 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3348 
3349 
3350 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3351   JVMWrapper("JVM_GetAndClearReferencePendingList");
3352 
3353   MonitorLockerEx ml(Heap_lock);
3354   oop ref = Universe::reference_pending_list();
3355   if (ref != NULL) {
3356     Universe::set_reference_pending_list(NULL);
3357   }
3358   return JNIHandles::make_local(env, ref);
3359 JVM_END
3360 
3361 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3362   JVMWrapper("JVM_HasReferencePendingList");
3363   MonitorLockerEx ml(Heap_lock);
3364   return Universe::has_reference_pending_list();
3365 JVM_END
3366 
3367 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3368   JVMWrapper("JVM_WaitForReferencePendingList");
3369   MonitorLockerEx ml(Heap_lock);
3370   while (!Universe::has_reference_pending_list()) {
3371     ml.wait();
3372   }
3373 JVM_END
3374 
3375 
3376 // ObjectInputStream ///////////////////////////////////////////////////////////////
3377 
3378 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3379   if (current_class == NULL) {
3380     return true;
3381   }
3382   if ((current_class == field_class) || access.is_public()) {
3383     return true;
3384   }
3385 
3386   if (access.is_protected()) {
3387     // See if current_class is a subclass of field_class
3388     if (current_class->is_subclass_of(field_class)) {
3389       return true;
3390     }
3391   }
3392 
3393   return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3394 }
3395 
3396 // Return the first user-defined class loader up the execution stack, or null
3397 // if only code from the bootstrap or platform class loader is on the stack.
3398 
3399 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3400   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3401     vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3402     oop loader = vfst.method()->method_holder()->class_loader();
3403     if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3404       return JNIHandles::make_local(env, loader);
3405     }
3406   }
3407   return NULL;
3408 JVM_END
3409 
3410 
3411 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3412 
3413 
3414 // resolve array handle and check arguments
3415 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3416   if (arr == NULL) {
3417     THROW_0(vmSymbols::java_lang_NullPointerException());
3418   }
3419   oop a = JNIHandles::resolve_non_null(arr);
3420   if (!a->is_array()) {
3421     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3422   } else if (type_array_only && !a->is_typeArray()) {
3423     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3424   }
3425   return arrayOop(a);
3426 }
3427 
3428 
3429 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3430   JVMWrapper("JVM_GetArrayLength");
3431   arrayOop a = check_array(env, arr, false, CHECK_0);
3432   return a->length();
3433 JVM_END
3434 
3435 
3436 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3437   JVMWrapper("JVM_Array_Get");
3438   JvmtiVMObjectAllocEventCollector oam;
3439   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3440   jvalue value;
3441   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3442   oop box = Reflection::box(&value, type, CHECK_NULL);
3443   return JNIHandles::make_local(env, box);
3444 JVM_END
3445 
3446 
3447 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3448   JVMWrapper("JVM_GetPrimitiveArrayElement");
3449   jvalue value;
3450   value.i = 0; // to initialize value before getting used in CHECK
3451   arrayOop a = check_array(env, arr, true, CHECK_(value));
3452   assert(a->is_typeArray(), "just checking");
3453   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3454   BasicType wide_type = (BasicType) wCode;
3455   if (type != wide_type) {
3456     Reflection::widen(&value, type, wide_type, CHECK_(value));
3457   }
3458   return value;
3459 JVM_END
3460 
3461 
3462 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3463   JVMWrapper("JVM_SetArrayElement");
3464   arrayOop a = check_array(env, arr, false, CHECK);
3465   oop box = JNIHandles::resolve(val);
3466   jvalue value;
3467   value.i = 0; // to initialize value before getting used in CHECK
3468   BasicType value_type;
3469   if (a->is_objArray()) {
3470     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3471     value_type = Reflection::unbox_for_regular_object(box, &value);
3472   } else {
3473     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3474   }
3475   Reflection::array_set(&value, a, index, value_type, CHECK);
3476 JVM_END
3477 
3478 
3479 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3480   JVMWrapper("JVM_SetPrimitiveArrayElement");
3481   arrayOop a = check_array(env, arr, true, CHECK);
3482   assert(a->is_typeArray(), "just checking");
3483   BasicType value_type = (BasicType) vCode;
3484   Reflection::array_set(&v, a, index, value_type, CHECK);
3485 JVM_END
3486 
3487 
3488 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3489   JVMWrapper("JVM_NewArray");
3490   JvmtiVMObjectAllocEventCollector oam;
3491   oop element_mirror = JNIHandles::resolve(eltClass);
3492   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3493   return JNIHandles::make_local(env, result);
3494 JVM_END
3495 
3496 
3497 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3498   JVMWrapper("JVM_NewMultiArray");
3499   JvmtiVMObjectAllocEventCollector oam;
3500   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3501   oop element_mirror = JNIHandles::resolve(eltClass);
3502   assert(dim_array->is_typeArray(), "just checking");
3503   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3504   return JNIHandles::make_local(env, result);
3505 JVM_END
3506 
3507 
3508 // Library support ///////////////////////////////////////////////////////////////////////////
3509 
3510 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3511   //%note jvm_ct
3512   JVMWrapper("JVM_LoadLibrary");
3513   char ebuf[1024];
3514   void *load_result;
3515   {
3516     ThreadToNativeFromVM ttnfvm(thread);
3517     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3518   }
3519   if (load_result == NULL) {
3520     char msg[1024];
3521     jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3522     // Since 'ebuf' may contain a string encoded using
3523     // platform encoding scheme, we need to pass
3524     // Exceptions::unsafe_to_utf8 to the new_exception method
3525     // as the last argument. See bug 6367357.
3526     Handle h_exception =
3527       Exceptions::new_exception(thread,
3528                                 vmSymbols::java_lang_UnsatisfiedLinkError(),
3529                                 msg, Exceptions::unsafe_to_utf8);
3530 
3531     THROW_HANDLE_0(h_exception);
3532   }
3533   return load_result;
3534 JVM_END
3535 
3536 
3537 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3538   JVMWrapper("JVM_UnloadLibrary");
3539   os::dll_unload(handle);
3540 JVM_END
3541 
3542 
3543 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3544   JVMWrapper("JVM_FindLibraryEntry");
3545   return os::dll_lookup(handle, name);
3546 JVM_END
3547 
3548 
3549 // JNI version ///////////////////////////////////////////////////////////////////////////////
3550 
3551 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3552   JVMWrapper("JVM_IsSupportedJNIVersion");
3553   return Threads::is_supported_jni_version_including_1_1(version);
3554 JVM_END
3555 
3556 
3557 // String support ///////////////////////////////////////////////////////////////////////////
3558 
3559 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3560   JVMWrapper("JVM_InternString");
3561   JvmtiVMObjectAllocEventCollector oam;
3562   if (str == NULL) return NULL;
3563   oop string = JNIHandles::resolve_non_null(str);
3564   oop result = StringTable::intern(string, CHECK_NULL);
3565   return (jstring) JNIHandles::make_local(env, result);
3566 JVM_END
3567 
3568 
3569 // Raw monitor support //////////////////////////////////////////////////////////////////////
3570 
3571 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3572 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3573 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3574 // that only works with java threads.
3575 
3576 
3577 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3578   VM_Exit::block_if_vm_exited();
3579   JVMWrapper("JVM_RawMonitorCreate");
3580   return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3581 }
3582 
3583 
3584 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3585   VM_Exit::block_if_vm_exited();
3586   JVMWrapper("JVM_RawMonitorDestroy");
3587   delete ((Mutex*) mon);
3588 }
3589 
3590 
3591 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3592   VM_Exit::block_if_vm_exited();
3593   JVMWrapper("JVM_RawMonitorEnter");
3594   ((Mutex*) mon)->jvm_raw_lock();
3595   return 0;
3596 }
3597 
3598 
3599 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3600   VM_Exit::block_if_vm_exited();
3601   JVMWrapper("JVM_RawMonitorExit");
3602   ((Mutex*) mon)->jvm_raw_unlock();
3603 }
3604 
3605 
3606 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3607 
3608 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3609                                     Handle loader, Handle protection_domain,
3610                                     jboolean throwError, TRAPS) {
3611   // Security Note:
3612   //   The Java level wrapper will perform the necessary security check allowing
3613   //   us to pass the NULL as the initiating class loader.  The VM is responsible for
3614   //   the checkPackageAccess relative to the initiating class loader via the
3615   //   protection_domain. The protection_domain is passed as NULL by the java code
3616   //   if there is no security manager in 3-arg Class.forName().
3617   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3618 
3619   KlassHandle klass_handle(THREAD, klass);
3620   // Check if we should initialize the class
3621   if (init && klass_handle->is_instance_klass()) {
3622     klass_handle->initialize(CHECK_NULL);
3623   }
3624   return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3625 }
3626 
3627 
3628 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3629 
3630 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3631   JVMWrapper("JVM_InvokeMethod");
3632   Handle method_handle;
3633   if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3634     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3635     Handle receiver(THREAD, JNIHandles::resolve(obj));
3636     objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3637     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3638     jobject res = JNIHandles::make_local(env, result);
3639     if (JvmtiExport::should_post_vm_object_alloc()) {
3640       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3641       assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3642       if (java_lang_Class::is_primitive(ret_type)) {
3643         // Only for primitive type vm allocates memory for java object.
3644         // See box() method.
3645         JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3646       }
3647     }
3648     return res;
3649   } else {
3650     THROW_0(vmSymbols::java_lang_StackOverflowError());
3651   }
3652 JVM_END
3653 
3654 
3655 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3656   JVMWrapper("JVM_NewInstanceFromConstructor");
3657   oop constructor_mirror = JNIHandles::resolve(c);
3658   objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3659   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3660   jobject res = JNIHandles::make_local(env, result);
3661   if (JvmtiExport::should_post_vm_object_alloc()) {
3662     JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3663   }
3664   return res;
3665 JVM_END
3666 
3667 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3668 
3669 JVM_LEAF(jboolean, JVM_SupportsCX8())
3670   JVMWrapper("JVM_SupportsCX8");
3671   return VM_Version::supports_cx8();
3672 JVM_END
3673 
3674 // Returns an array of all live Thread objects (VM internal JavaThreads,
3675 // jvmti agent threads, and JNI attaching threads  are skipped)
3676 // See CR 6404306 regarding JNI attaching threads
3677 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3678   ResourceMark rm(THREAD);
3679   ThreadsListEnumerator tle(THREAD, false, false);
3680   JvmtiVMObjectAllocEventCollector oam;
3681 
3682   int num_threads = tle.num_threads();
3683   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3684   objArrayHandle threads_ah(THREAD, r);
3685 
3686   for (int i = 0; i < num_threads; i++) {
3687     Handle h = tle.get_threadObj(i);
3688     threads_ah->obj_at_put(i, h());
3689   }
3690 
3691   return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3692 JVM_END
3693 
3694 
3695 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3696 // Return StackTraceElement[][], each element is the stack trace of a thread in
3697 // the corresponding entry in the given threads array
3698 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3699   JVMWrapper("JVM_DumpThreads");
3700   JvmtiVMObjectAllocEventCollector oam;
3701 
3702   // Check if threads is null
3703   if (threads == NULL) {
3704     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3705   }
3706 
3707   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3708   objArrayHandle ah(THREAD, a);
3709   int num_threads = ah->length();
3710   // check if threads is non-empty array
3711   if (num_threads == 0) {
3712     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3713   }
3714 
3715   // check if threads is not an array of objects of Thread class
3716   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3717   if (k != SystemDictionary::Thread_klass()) {
3718     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3719   }
3720 
3721   ResourceMark rm(THREAD);
3722 
3723   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3724   for (int i = 0; i < num_threads; i++) {
3725     oop thread_obj = ah->obj_at(i);
3726     instanceHandle h(THREAD, (instanceOop) thread_obj);
3727     thread_handle_array->append(h);
3728   }
3729 
3730   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3731   return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3732 
3733 JVM_END
3734 
3735 // JVM monitoring and management support
3736 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3737   return Management::get_jmm_interface(version);
3738 JVM_END
3739 
3740 // com.sun.tools.attach.VirtualMachine agent properties support
3741 //
3742 // Initialize the agent properties with the properties maintained in the VM
3743 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3744   JVMWrapper("JVM_InitAgentProperties");
3745   ResourceMark rm;
3746 
3747   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3748 
3749   PUTPROP(props, "sun.java.command", Arguments::java_command());
3750   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3751   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3752   return properties;
3753 JVM_END
3754 
3755 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3756 {
3757   JVMWrapper("JVM_GetEnclosingMethodInfo");
3758   JvmtiVMObjectAllocEventCollector oam;
3759 
3760   if (ofClass == NULL) {
3761     return NULL;
3762   }
3763   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3764   // Special handling for primitive objects
3765   if (java_lang_Class::is_primitive(mirror())) {
3766     return NULL;
3767   }
3768   Klass* k = java_lang_Class::as_Klass(mirror());
3769   if (!k->is_instance_klass()) {
3770     return NULL;
3771   }
3772   instanceKlassHandle ik_h(THREAD, k);
3773   int encl_method_class_idx = ik_h->enclosing_method_class_index();
3774   if (encl_method_class_idx == 0) {
3775     return NULL;
3776   }
3777   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3778   objArrayHandle dest(THREAD, dest_o);
3779   Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3780   dest->obj_at_put(0, enc_k->java_mirror());
3781   int encl_method_method_idx = ik_h->enclosing_method_method_index();
3782   if (encl_method_method_idx != 0) {
3783     Symbol* sym = ik_h->constants()->symbol_at(
3784                         extract_low_short_from_int(
3785                           ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3786     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3787     dest->obj_at_put(1, str());
3788     sym = ik_h->constants()->symbol_at(
3789               extract_high_short_from_int(
3790                 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3791     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3792     dest->obj_at_put(2, str());
3793   }
3794   return (jobjectArray) JNIHandles::make_local(dest());
3795 }
3796 JVM_END
3797 
3798 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3799 {
3800   memset(info, 0, info_size);
3801 
3802   info->jvm_version = Abstract_VM_Version::jvm_version();
3803   info->patch_version = Abstract_VM_Version::vm_patch_version();
3804 
3805   // when we add a new capability in the jvm_version_info struct, we should also
3806   // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3807   // counter defined in runtimeService.cpp.
3808   info->is_attachable = AttachListener::is_attach_supported();
3809 }
3810 JVM_END
3811 
3812 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3813 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3814   ResourceMark rm(THREAD);
3815 
3816   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3817     return NULL;
3818   }
3819 
3820   char** vm_flags = Arguments::jvm_flags_array();
3821   char** vm_args = Arguments::jvm_args_array();
3822   int num_flags = Arguments::num_jvm_flags();
3823   int num_args = Arguments::num_jvm_args();
3824 
3825   instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
3826   objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
3827   objArrayHandle result_h(THREAD, r);
3828 
3829   int index = 0;
3830   for (int j = 0; j < num_flags; j++, index++) {
3831     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3832     result_h->obj_at_put(index, h());
3833   }
3834   for (int i = 0; i < num_args; i++, index++) {
3835     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3836     result_h->obj_at_put(index, h());
3837   }
3838   return (jobjectArray) JNIHandles::make_local(env, result_h());
3839 JVM_END
3840 
3841 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3842   return os::get_signal_number(name);
3843 JVM_END