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.inline.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 #ifdef TARGET_OS_FAMILY_linux
  88 # include "jvm_linux.h"
  89 #endif
  90 #ifdef TARGET_OS_FAMILY_solaris
  91 # include "jvm_solaris.h"
  92 #endif
  93 #ifdef TARGET_OS_FAMILY_windows
  94 # include "jvm_windows.h"
  95 #endif
  96 #ifdef TARGET_OS_FAMILY_aix
  97 # include "jvm_aix.h"
  98 #endif
  99 #ifdef TARGET_OS_FAMILY_bsd
 100 # include "jvm_bsd.h"
 101 #endif
 102 
 103 #include <errno.h>
 104 
 105 /*
 106   NOTE about use of any ctor or function call that can trigger a safepoint/GC:
 107   such ctors and calls MUST NOT come between an oop declaration/init and its
 108   usage because if objects are move this may cause various memory stomps, bus
 109   errors and segfaults. Here is a cookbook for causing so called "naked oop
 110   failures":
 111 
 112       JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
 113           JVMWrapper("JVM_GetClassDeclaredFields");
 114 
 115           // Object address to be held directly in mirror & not visible to GC
 116           oop mirror = JNIHandles::resolve_non_null(ofClass);
 117 
 118           // If this ctor can hit a safepoint, moving objects around, then
 119           ComplexConstructor foo;
 120 
 121           // Boom! mirror may point to JUNK instead of the intended object
 122           (some dereference of mirror)
 123 
 124           // Here's another call that may block for GC, making mirror stale
 125           MutexLocker ml(some_lock);
 126 
 127           // And here's an initializer that can result in a stale oop
 128           // all in one step.
 129           oop o = call_that_can_throw_exception(TRAPS);
 130 
 131 
 132   The solution is to keep the oop declaration BELOW the ctor or function
 133   call that might cause a GC, do another resolve to reassign the oop, or
 134   consider use of a Handle instead of an oop so there is immunity from object
 135   motion. But note that the "QUICK" entries below do not have a handlemark
 136   and thus can only support use of handles passed in.
 137 */
 138 
 139 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
 140   ResourceMark rm;
 141   int line_number = -1;
 142   const char * source_file = NULL;
 143   const char * trace = "explicit";
 144   InstanceKlass* caller = NULL;
 145   JavaThread* jthread = JavaThread::current();
 146   if (jthread->has_last_Java_frame()) {
 147     vframeStream vfst(jthread);
 148 
 149     // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
 150     TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
 151     Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
 152     TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
 153     Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
 154 
 155     Method* last_caller = NULL;
 156 
 157     while (!vfst.at_end()) {
 158       Method* m = vfst.method();
 159       if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
 160           !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
 161           !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
 162         break;
 163       }
 164       last_caller = m;
 165       vfst.next();
 166     }
 167     // if this is called from Class.forName0 and that is called from Class.forName,
 168     // then print the caller of Class.forName.  If this is Class.loadClass, then print
 169     // that caller, otherwise keep quiet since this should be picked up elsewhere.
 170     bool found_it = false;
 171     if (!vfst.at_end() &&
 172         vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 173         vfst.method()->name() == vmSymbols::forName0_name()) {
 174       vfst.next();
 175       if (!vfst.at_end() &&
 176           vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 177           vfst.method()->name() == vmSymbols::forName_name()) {
 178         vfst.next();
 179         found_it = true;
 180       }
 181     } else if (last_caller != NULL &&
 182                last_caller->method_holder()->name() ==
 183                vmSymbols::java_lang_ClassLoader() &&
 184                (last_caller->name() == vmSymbols::loadClassInternal_name() ||
 185                 last_caller->name() == vmSymbols::loadClass_name())) {
 186       found_it = true;
 187     } else if (!vfst.at_end()) {
 188       if (vfst.method()->is_native()) {
 189         // JNI call
 190         found_it = true;
 191       }
 192     }
 193     if (found_it && !vfst.at_end()) {
 194       // found the caller
 195       caller = vfst.method()->method_holder();
 196       line_number = vfst.method()->line_number_from_bci(vfst.bci());
 197       if (line_number == -1) {
 198         // show method name if it's a native method
 199         trace = vfst.method()->name_and_sig_as_C_string();
 200       }
 201       Symbol* s = caller->source_file_name();
 202       if (s != NULL) {
 203         source_file = s->as_C_string();
 204       }
 205     }
 206   }
 207   if (caller != NULL) {
 208     if (to_class != caller) {
 209       const char * from = caller->external_name();
 210       const char * to = to_class->external_name();
 211       // print in a single call to reduce interleaving between threads
 212       if (source_file != NULL) {
 213         log_debug(classresolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
 214       } else {
 215         log_debug(classresolve)("%s %s (%s)", from, to, trace);
 216       }
 217     }
 218   }
 219 }
 220 
 221 void trace_class_resolution(Klass* to_class) {
 222   EXCEPTION_MARK;
 223   trace_class_resolution_impl(to_class, THREAD);
 224   if (HAS_PENDING_EXCEPTION) {
 225     CLEAR_PENDING_EXCEPTION;
 226   }
 227 }
 228 
 229 // Wrapper to trace JVM functions
 230 
 231 #ifdef ASSERT
 232   Histogram* JVMHistogram;
 233   volatile jint JVMHistogram_lock = 0;
 234 
 235   class JVMHistogramElement : public HistogramElement {
 236     public:
 237      JVMHistogramElement(const char* name);
 238   };
 239 
 240   JVMHistogramElement::JVMHistogramElement(const char* elementName) {
 241     _name = elementName;
 242     uintx count = 0;
 243 
 244     while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
 245       while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
 246         count +=1;
 247         if ( (WarnOnStalledSpinLock > 0)
 248           && (count % WarnOnStalledSpinLock == 0)) {
 249           warning("JVMHistogram_lock seems to be stalled");
 250         }
 251       }
 252      }
 253 
 254     if(JVMHistogram == NULL)
 255       JVMHistogram = new Histogram("JVM Call Counts",100);
 256 
 257     JVMHistogram->add_element(this);
 258     Atomic::dec(&JVMHistogram_lock);
 259   }
 260 
 261   #define JVMCountWrapper(arg) \
 262       static JVMHistogramElement* e = new JVMHistogramElement(arg); \
 263       if (e != NULL) e->increment_count();  // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
 264 
 265   #define JVMWrapper(arg) JVMCountWrapper(arg);
 266 #else
 267   #define JVMWrapper(arg)
 268 #endif
 269 
 270 
 271 // Interface version /////////////////////////////////////////////////////////////////////
 272 
 273 
 274 JVM_LEAF(jint, JVM_GetInterfaceVersion())
 275   return JVM_INTERFACE_VERSION;
 276 JVM_END
 277 
 278 
 279 // java.lang.System //////////////////////////////////////////////////////////////////////
 280 
 281 
 282 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
 283   JVMWrapper("JVM_CurrentTimeMillis");
 284   return os::javaTimeMillis();
 285 JVM_END
 286 
 287 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
 288   JVMWrapper("JVM_NanoTime");
 289   return os::javaTimeNanos();
 290 JVM_END
 291 
 292 // The function below is actually exposed by jdk.internal.misc.VM and not
 293 // java.lang.System, but we choose to keep it here so that it stays next
 294 // to JVM_CurrentTimeMillis and JVM_NanoTime
 295 
 296 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); //  2^32
 297 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
 298 
 299 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
 300   JVMWrapper("JVM_GetNanoTimeAdjustment");
 301   jlong seconds;
 302   jlong nanos;
 303 
 304   os::javaTimeSystemUTC(seconds, nanos);
 305 
 306   // We're going to verify that the result can fit in a long.
 307   // For that we need the difference in seconds between 'seconds'
 308   // and 'offset_secs' to be such that:
 309   //     |seconds - offset_secs| < (2^63/10^9)
 310   // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
 311   // which makes |seconds - offset_secs| < 2^33
 312   // and we will prefer +/- 2^32 as the maximum acceptable diff
 313   // as 2^32 has a more natural feel than 2^33...
 314   //
 315   // So if |seconds - offset_secs| >= 2^32 - we return a special
 316   // sentinel value (-1) which the caller should take as an
 317   // exception value indicating that the offset given to us is
 318   // too far from range of the current time - leading to too big
 319   // a nano adjustment. The caller is expected to recover by
 320   // computing a more accurate offset and calling this method
 321   // again. (For the record 2^32 secs is ~136 years, so that
 322   // should rarely happen)
 323   //
 324   jlong diff = seconds - offset_secs;
 325   if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
 326      return -1; // sentinel value: the offset is too far off the target
 327   }
 328 
 329   // return the adjustment. If you compute a time by adding
 330   // this number of nanoseconds along with the number of seconds
 331   // in the offset you should get the current UTC time.
 332   return (diff * (jlong)1000000000) + nanos;
 333 JVM_END
 334 
 335 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
 336                                jobject dst, jint dst_pos, jint length))
 337   JVMWrapper("JVM_ArrayCopy");
 338   // Check if we have null pointers
 339   if (src == NULL || dst == NULL) {
 340     THROW(vmSymbols::java_lang_NullPointerException());
 341   }
 342   arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
 343   arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
 344   assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
 345   assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
 346   // Do copy
 347   s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
 348 JVM_END
 349 
 350 
 351 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
 352   JavaValue r(T_OBJECT);
 353   // public synchronized Object put(Object key, Object value);
 354   HandleMark hm(THREAD);
 355   Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK);
 356   Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
 357   JavaCalls::call_virtual(&r,
 358                           props,
 359                           KlassHandle(THREAD, SystemDictionary::Properties_klass()),
 360                           vmSymbols::put_name(),
 361                           vmSymbols::object_object_object_signature(),
 362                           key_str,
 363                           value_str,
 364                           THREAD);
 365 }
 366 
 367 
 368 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
 369 
 370 
 371 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
 372   JVMWrapper("JVM_InitProperties");
 373   ResourceMark rm;
 374 
 375   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
 376 
 377   // System property list includes both user set via -D option and
 378   // jvm system specific properties.
 379   for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
 380     PUTPROP(props, p->key(), p->value());
 381   }
 382 
 383   // Convert the -XX:MaxDirectMemorySize= command line flag
 384   // to the sun.nio.MaxDirectMemorySize property.
 385   // Do this after setting user properties to prevent people
 386   // from setting the value with a -D option, as requested.
 387   {
 388     if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
 389       PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
 390     } else {
 391       char as_chars[256];
 392       jio_snprintf(as_chars, sizeof(as_chars), SIZE_FORMAT, MaxDirectMemorySize);
 393       PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
 394     }
 395   }
 396 
 397   // JVM monitoring and management support
 398   // Add the sun.management.compiler property for the compiler's name
 399   {
 400 #undef CSIZE
 401 #if defined(_LP64) || defined(_WIN64)
 402   #define CSIZE "64-Bit "
 403 #else
 404   #define CSIZE
 405 #endif // 64bit
 406 
 407 #ifdef TIERED
 408     const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
 409 #else
 410 #if defined(COMPILER1)
 411     const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
 412 #elif defined(COMPILER2)
 413     const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
 414 #elif INCLUDE_JVMCI
 415     #error "INCLUDE_JVMCI should imply TIERED"
 416 #else
 417     const char* compiler_name = "";
 418 #endif // compilers
 419 #endif // TIERED
 420 
 421     if (*compiler_name != '\0' &&
 422         (Arguments::mode() != Arguments::_int)) {
 423       PUTPROP(props, "sun.management.compiler", compiler_name);
 424     }
 425   }
 426 
 427   return properties;
 428 JVM_END
 429 
 430 
 431 /*
 432  * Return the temporary directory that the VM uses for the attach
 433  * and perf data files.
 434  *
 435  * It is important that this directory is well-known and the
 436  * same for all VM instances. It cannot be affected by configuration
 437  * variables such as java.io.tmpdir.
 438  */
 439 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 440   JVMWrapper("JVM_GetTemporaryDirectory");
 441   HandleMark hm(THREAD);
 442   const char* temp_dir = os::get_temp_directory();
 443   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 444   return (jstring) JNIHandles::make_local(env, h());
 445 JVM_END
 446 
 447 
 448 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 449 
 450 extern volatile jint vm_created;
 451 
 452 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 453   before_exit(thread);
 454   vm_exit(code);
 455 JVM_END
 456 
 457 
 458 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 459   JVMWrapper("JVM_GC");
 460   if (!DisableExplicitGC) {
 461     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 462   }
 463 JVM_END
 464 
 465 
 466 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 467   JVMWrapper("JVM_MaxObjectInspectionAge");
 468   return Universe::heap()->millis_since_last_gc();
 469 JVM_END
 470 
 471 
 472 static inline jlong convert_size_t_to_jlong(size_t val) {
 473   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 474   NOT_LP64 (return (jlong)val;)
 475   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 476 }
 477 
 478 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 479   JVMWrapper("JVM_TotalMemory");
 480   size_t n = Universe::heap()->capacity();
 481   return convert_size_t_to_jlong(n);
 482 JVM_END
 483 
 484 
 485 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 486   JVMWrapper("JVM_FreeMemory");
 487   CollectedHeap* ch = Universe::heap();
 488   size_t n;
 489   {
 490      MutexLocker x(Heap_lock);
 491      n = ch->capacity() - ch->used();
 492   }
 493   return convert_size_t_to_jlong(n);
 494 JVM_END
 495 
 496 
 497 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 498   JVMWrapper("JVM_MaxMemory");
 499   size_t n = Universe::heap()->max_capacity();
 500   return convert_size_t_to_jlong(n);
 501 JVM_END
 502 
 503 
 504 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 505   JVMWrapper("JVM_ActiveProcessorCount");
 506   return os::active_processor_count();
 507 JVM_END
 508 
 509 
 510 
 511 // java.lang.Throwable //////////////////////////////////////////////////////
 512 
 513 
 514 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 515   JVMWrapper("JVM_FillInStackTrace");
 516   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 517   java_lang_Throwable::fill_in_stack_trace(exception);
 518 JVM_END
 519 
 520 
 521 JVM_ENTRY(void, JVM_GetStackTraceElements(JNIEnv *env, jobject throwable, jobjectArray stackTrace))
 522   JVMWrapper("JVM_GetStackTraceElements");
 523   Handle exception(THREAD, JNIHandles::resolve(throwable));
 524   objArrayOop st = objArrayOop(JNIHandles::resolve(stackTrace));
 525   objArrayHandle stack_trace(THREAD, st);
 526   // Fill in the allocated stack trace
 527   java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
 528 JVM_END
 529 
 530 
 531 // java.lang.StackWalker //////////////////////////////////////////////////////
 532 
 533 
 534 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
 535                                      jint skip_frames, jint frame_count, jint start_index,
 536                                      jobjectArray frames))
 537   JVMWrapper("JVM_CallStackWalk");
 538   JavaThread* jt = (JavaThread*) THREAD;
 539   if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
 540     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
 541   }
 542 
 543   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 544 
 545   // frames array is a Class<?>[] array when only getting caller reference,
 546   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 547   // be null.
 548   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 549   objArrayHandle frames_array_h(THREAD, fa);
 550 
 551   int limit = start_index + frame_count;
 552   if (frames_array_h->length() < limit) {
 553     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
 554   }
 555 
 556   Handle result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
 557                                   start_index, frames_array_h, CHECK_NULL);
 558   return JNIHandles::make_local(env, result());
 559 JVM_END
 560 
 561 
 562 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
 563                                   jint frame_count, jint start_index,
 564                                   jobjectArray frames))
 565   JVMWrapper("JVM_MoreStackWalk");
 566   JavaThread* jt = (JavaThread*) THREAD;
 567 
 568   // frames array is a Class<?>[] array when only getting caller reference,
 569   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 570   // be null.
 571   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 572   objArrayHandle frames_array_h(THREAD, fa);
 573 
 574   int limit = start_index+frame_count;
 575   if (frames_array_h->length() < limit) {
 576     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 577   }
 578 
 579   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 580   return StackWalk::moreFrames(stackStream_h, mode, anchor, frame_count,
 581                                start_index, frames_array_h, THREAD);
 582 JVM_END
 583 
 584 JVM_ENTRY(void, JVM_ToStackTraceElement(JNIEnv *env, jobject frame, jobject stack))
 585   JVMWrapper("JVM_ToStackTraceElement");
 586   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(frame));
 587   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(stack));
 588   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
 589 JVM_END
 590 
 591 // java.lang.Object ///////////////////////////////////////////////
 592 
 593 
 594 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 595   JVMWrapper("JVM_IHashCode");
 596   // as implemented in the classic virtual machine; return 0 if object is NULL
 597   return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
 598 JVM_END
 599 
 600 
 601 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 602   JVMWrapper("JVM_MonitorWait");
 603   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 604   JavaThreadInObjectWaitState jtiows(thread, ms != 0);
 605   if (JvmtiExport::should_post_monitor_wait()) {
 606     JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
 607 
 608     // The current thread already owns the monitor and it has not yet
 609     // been added to the wait queue so the current thread cannot be
 610     // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
 611     // event handler cannot accidentally consume an unpark() meant for
 612     // the ParkEvent associated with this ObjectMonitor.
 613   }
 614   ObjectSynchronizer::wait(obj, ms, CHECK);
 615 JVM_END
 616 
 617 
 618 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 619   JVMWrapper("JVM_MonitorNotify");
 620   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 621   ObjectSynchronizer::notify(obj, CHECK);
 622 JVM_END
 623 
 624 
 625 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 626   JVMWrapper("JVM_MonitorNotifyAll");
 627   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 628   ObjectSynchronizer::notifyall(obj, CHECK);
 629 JVM_END
 630 
 631 
 632 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 633   JVMWrapper("JVM_Clone");
 634   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 635   const KlassHandle klass (THREAD, obj->klass());
 636   JvmtiVMObjectAllocEventCollector oam;
 637 
 638 #ifdef ASSERT
 639   // Just checking that the cloneable flag is set correct
 640   if (obj->is_array()) {
 641     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 642   } else {
 643     guarantee(obj->is_instance(), "should be instanceOop");
 644     bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
 645     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 646   }
 647 #endif
 648 
 649   // Check if class of obj supports the Cloneable interface.
 650   // All arrays are considered to be cloneable (See JLS 20.1.5)
 651   if (!klass->is_cloneable()) {
 652     ResourceMark rm(THREAD);
 653     THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 654   }
 655 
 656   // Make shallow object copy
 657   const int size = obj->size();
 658   oop new_obj_oop = NULL;
 659   if (obj->is_array()) {
 660     const int length = ((arrayOop)obj())->length();
 661     new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
 662   } else {
 663     new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
 664   }
 665 
 666   // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
 667   // is modifying a reference field in the clonee, a non-oop-atomic copy might
 668   // be suspended in the middle of copying the pointer and end up with parts
 669   // of two different pointers in the field.  Subsequent dereferences will crash.
 670   // 4846409: an oop-copy of objects with long or double fields or arrays of same
 671   // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
 672   // of oops.  We know objects are aligned on a minimum of an jlong boundary.
 673   // The same is true of StubRoutines::object_copy and the various oop_copy
 674   // variants, and of the code generated by the inline_native_clone intrinsic.
 675   assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
 676   Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
 677                                (size_t)align_object_size(size) / HeapWordsPerLong);
 678   // Clear the header
 679   new_obj_oop->init_mark();
 680 
 681   // Store check (mark entire object and let gc sort it out)
 682   BarrierSet* bs = Universe::heap()->barrier_set();
 683   assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
 684   bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
 685 
 686   Handle new_obj(THREAD, new_obj_oop);
 687   // Special handling for MemberNames.  Since they contain Method* metadata, they
 688   // must be registered so that RedefineClasses can fix metadata contained in them.
 689   if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
 690       java_lang_invoke_MemberName::is_method(new_obj())) {
 691     Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
 692     // MemberName may be unresolved, so doesn't need registration until resolved.
 693     if (method != NULL) {
 694       methodHandle m(THREAD, method);
 695       // This can safepoint and redefine method, so need both new_obj and method
 696       // in a handle, for two different reasons.  new_obj can move, method can be
 697       // deleted if nothing is using it on the stack.
 698       m->method_holder()->add_member_name(new_obj());
 699     }
 700   }
 701 
 702   // Caution: this involves a java upcall, so the clone should be
 703   // "gc-robust" by this stage.
 704   if (klass->has_finalizer()) {
 705     assert(obj->is_instance(), "should be instanceOop");
 706     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 707     new_obj = Handle(THREAD, new_obj_oop);
 708   }
 709 
 710   return JNIHandles::make_local(env, new_obj());
 711 JVM_END
 712 
 713 // java.io.File ///////////////////////////////////////////////////////////////
 714 
 715 JVM_LEAF(char*, JVM_NativePath(char* path))
 716   JVMWrapper("JVM_NativePath");
 717   return os::native_path(path);
 718 JVM_END
 719 
 720 
 721 // Misc. class handling ///////////////////////////////////////////////////////////
 722 
 723 
 724 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
 725   JVMWrapper("JVM_GetCallerClass");
 726 
 727   // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
 728   // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
 729   // temporarily for existing code to use until a replacement API is defined.
 730   if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
 731     Klass* k = thread->security_get_caller_class(depth);
 732     return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
 733   }
 734 
 735   // Getting the class of the caller frame.
 736   //
 737   // The call stack at this point looks something like this:
 738   //
 739   // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
 740   // [1] [ @CallerSensitive API.method                                   ]
 741   // [.] [ (skipped intermediate frames)                                 ]
 742   // [n] [ caller                                                        ]
 743   vframeStream vfst(thread);
 744   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 745   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 746     Method* m = vfst.method();
 747     assert(m != NULL, "sanity");
 748     switch (n) {
 749     case 0:
 750       // This must only be called from Reflection.getCallerClass
 751       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 752         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 753       }
 754       // fall-through
 755     case 1:
 756       // Frame 0 and 1 must be caller sensitive.
 757       if (!m->caller_sensitive()) {
 758         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 759       }
 760       break;
 761     default:
 762       if (!m->is_ignored_by_security_stack_walk()) {
 763         // We have reached the desired frame; return the holder class.
 764         return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
 765       }
 766       break;
 767     }
 768   }
 769   return NULL;
 770 JVM_END
 771 
 772 
 773 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 774   JVMWrapper("JVM_FindPrimitiveClass");
 775   oop mirror = NULL;
 776   BasicType t = name2type(utf);
 777   if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
 778     mirror = Universe::java_mirror(t);
 779   }
 780   if (mirror == NULL) {
 781     THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 782   } else {
 783     return (jclass) JNIHandles::make_local(env, mirror);
 784   }
 785 JVM_END
 786 
 787 
 788 // Returns a class loaded by the bootstrap class loader; or null
 789 // if not found.  ClassNotFoundException is not thrown.
 790 // FindClassFromBootLoader is exported to the launcher for windows.
 791 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 792                                               const char* name))
 793   JVMWrapper("JVM_FindClassFromBootLoader");
 794 
 795   // Java libraries should ensure that name is never null...
 796   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 797     // It's impossible to create this class;  the name cannot fit
 798     // into the constant pool.
 799     return NULL;
 800   }
 801 
 802   TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
 803   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 804   if (k == NULL) {
 805     return NULL;
 806   }
 807 
 808   if (log_is_enabled(Debug, classresolve)) {
 809     trace_class_resolution(k);
 810   }
 811   return (jclass) JNIHandles::make_local(env, k->java_mirror());
 812 JVM_END
 813 
 814 // Find a class with this name in this loader, using the caller's protection domain.
 815 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
 816                                           jboolean init, jobject loader,
 817                                           jclass caller))
 818   JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
 819   // Java libraries should ensure that name is never null...
 820   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 821     // It's impossible to create this class;  the name cannot fit
 822     // into the constant pool.
 823     THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
 824   }
 825 
 826   TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
 827 
 828   oop loader_oop = JNIHandles::resolve(loader);
 829   oop from_class = JNIHandles::resolve(caller);
 830   oop protection_domain = NULL;
 831   // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
 832   // NPE. Put it in another way, the bootstrap class loader has all permission and
 833   // thus no checkPackageAccess equivalence in the VM class loader.
 834   // The caller is also passed as NULL by the java code if there is no security
 835   // manager to avoid the performance cost of getting the calling class.
 836   if (from_class != NULL && loader_oop != NULL) {
 837     protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
 838   }
 839 
 840   Handle h_loader(THREAD, loader_oop);
 841   Handle h_prot(THREAD, protection_domain);
 842   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 843                                                h_prot, false, THREAD);
 844 
 845   if (log_is_enabled(Debug, classresolve) && result != NULL) {
 846     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 847   }
 848   return result;
 849 JVM_END
 850 
 851 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 852                                          jboolean init, jclass from))
 853   JVMWrapper("JVM_FindClassFromClass");
 854   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 855     // It's impossible to create this class;  the name cannot fit
 856     // into the constant pool.
 857     THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
 858   }
 859   TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
 860   oop from_class_oop = JNIHandles::resolve(from);
 861   Klass* from_class = (from_class_oop == NULL)
 862                            ? (Klass*)NULL
 863                            : java_lang_Class::as_Klass(from_class_oop);
 864   oop class_loader = NULL;
 865   oop protection_domain = NULL;
 866   if (from_class != NULL) {
 867     class_loader = from_class->class_loader();
 868     protection_domain = from_class->protection_domain();
 869   }
 870   Handle h_loader(THREAD, class_loader);
 871   Handle h_prot  (THREAD, protection_domain);
 872   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 873                                                h_prot, true, thread);
 874 
 875   if (log_is_enabled(Debug, classresolve) && result != NULL) {
 876     // this function is generally only used for class loading during verification.
 877     ResourceMark rm;
 878     oop from_mirror = JNIHandles::resolve_non_null(from);
 879     Klass* from_class = java_lang_Class::as_Klass(from_mirror);
 880     const char * from_name = from_class->external_name();
 881 
 882     oop mirror = JNIHandles::resolve_non_null(result);
 883     Klass* to_class = java_lang_Class::as_Klass(mirror);
 884     const char * to = to_class->external_name();
 885     log_debug(classresolve)("%s %s (verification)", from_name, to);
 886   }
 887 
 888   return result;
 889 JVM_END
 890 
 891 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
 892   if (loader.is_null()) {
 893     return;
 894   }
 895 
 896   // check whether the current caller thread holds the lock or not.
 897   // If not, increment the corresponding counter
 898   if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
 899       ObjectSynchronizer::owner_self) {
 900     counter->inc();
 901   }
 902 }
 903 
 904 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
 905 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
 906                                       jobject loader, const jbyte *buf,
 907                                       jsize len, jobject pd, const char *source,
 908                                       TRAPS) {
 909   if (source == NULL)  source = "__JVM_DefineClass__";
 910 
 911   assert(THREAD->is_Java_thread(), "must be a JavaThread");
 912   JavaThread* jt = (JavaThread*) THREAD;
 913 
 914   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
 915                              ClassLoader::perf_define_appclass_selftime(),
 916                              ClassLoader::perf_define_appclasses(),
 917                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 918                              jt->get_thread_stat()->perf_timers_addr(),
 919                              PerfClassTraceTime::DEFINE_CLASS);
 920 
 921   if (UsePerfData) {
 922     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
 923   }
 924 
 925   // Since exceptions can be thrown, class initialization can take place
 926   // if name is NULL no check for class name in .class stream has to be made.
 927   TempNewSymbol class_name = NULL;
 928   if (name != NULL) {
 929     const int str_len = (int)strlen(name);
 930     if (str_len > Symbol::max_length()) {
 931       // It's impossible to create this class;  the name cannot fit
 932       // into the constant pool.
 933       THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
 934     }
 935     class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
 936   }
 937 
 938   ResourceMark rm(THREAD);
 939   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
 940   Handle class_loader (THREAD, JNIHandles::resolve(loader));
 941   if (UsePerfData) {
 942     is_lock_held_by_thread(class_loader,
 943                            ClassLoader::sync_JVMDefineClassLockFreeCounter(),
 944                            THREAD);
 945   }
 946   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
 947   Klass* k = SystemDictionary::resolve_from_stream(class_name,
 948                                                    class_loader,
 949                                                    protection_domain,
 950                                                    &st,
 951                                                    CHECK_NULL);
 952 
 953   if (log_is_enabled(Debug, classresolve) && k != NULL) {
 954     trace_class_resolution(k);
 955   }
 956 
 957   return (jclass) JNIHandles::make_local(env, k->java_mirror());
 958 }
 959 
 960 
 961 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
 962   JVMWrapper("JVM_DefineClass");
 963 
 964   return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
 965 JVM_END
 966 
 967 
 968 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
 969   JVMWrapper("JVM_DefineClassWithSource");
 970 
 971   return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
 972 JVM_END
 973 
 974 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
 975   JVMWrapper("JVM_FindLoadedClass");
 976   ResourceMark rm(THREAD);
 977 
 978   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
 979   Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
 980 
 981   const char* str   = java_lang_String::as_utf8_string(string());
 982   // Sanity check, don't expect null
 983   if (str == NULL) return NULL;
 984 
 985   const int str_len = (int)strlen(str);
 986   if (str_len > Symbol::max_length()) {
 987     // It's impossible to create this class;  the name cannot fit
 988     // into the constant pool.
 989     return NULL;
 990   }
 991   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
 992 
 993   // Security Note:
 994   //   The Java level wrapper will perform the necessary security check allowing
 995   //   us to pass the NULL as the initiating class loader.
 996   Handle h_loader(THREAD, JNIHandles::resolve(loader));
 997   if (UsePerfData) {
 998     is_lock_held_by_thread(h_loader,
 999                            ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1000                            THREAD);
1001   }
1002 
1003   Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1004                                                               h_loader,
1005                                                               Handle(),
1006                                                               CHECK_NULL);
1007 #if INCLUDE_CDS
1008   if (k == NULL) {
1009     // If the class is not already loaded, try to see if it's in the shared
1010     // archive for the current classloader (h_loader).
1011     instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
1012         klass_name, h_loader, CHECK_NULL);
1013     k = ik();
1014   }
1015 #endif
1016   return (k == NULL) ? NULL :
1017             (jclass) JNIHandles::make_local(env, k->java_mirror());
1018 JVM_END
1019 
1020 // Module support //////////////////////////////////////////////////////////////////////////////
1021 
1022 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jstring version, jstring location,
1023                                  jobjectArray packages))
1024   JVMWrapper("JVM_DefineModule");
1025   Modules::define_module(module, version, location, packages, CHECK);
1026 JVM_END
1027 
1028 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1029   JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1030   Modules::set_bootloader_unnamed_module(module, CHECK);
1031 JVM_END
1032 
1033 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1034   JVMWrapper("JVM_AddModuleExports");
1035   Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1036 JVM_END
1037 
1038 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1039   JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1040   Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1041 JVM_END
1042 
1043 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1044   JVMWrapper("JVM_AddModuleExportsToAll");
1045   Modules::add_module_exports(from_module, package, NULL, CHECK);
1046 JVM_END
1047 
1048 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1049   JVMWrapper("JVM_AddReadsModule");
1050   Modules::add_reads_module(from_module, source_module, CHECK);
1051 JVM_END
1052 
1053 JVM_ENTRY(jboolean, JVM_CanReadModule(JNIEnv *env, jobject asking_module, jobject source_module))
1054   JVMWrapper("JVM_CanReadModule");
1055   return Modules::can_read_module(asking_module, source_module, THREAD);
1056 JVM_END
1057 
1058 JVM_ENTRY(jboolean, JVM_IsExportedToModule(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1059   JVMWrapper("JVM_IsExportedToModule");
1060   return Modules::is_exported_to_module(from_module, package, to_module, THREAD);
1061 JVM_END
1062 
1063 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, jstring package))
1064   JVMWrapper("JVM_AddModulePackage");
1065   Modules::add_module_package(module, package, CHECK);
1066 JVM_END
1067 
1068 JVM_ENTRY (jobject, JVM_GetModuleByPackageName(JNIEnv *env, jobject loader, jstring package))
1069   JVMWrapper("JVM_GetModuleByPackageName");
1070   return Modules::get_module_by_package_name(loader, package, THREAD);
1071 JVM_END
1072 
1073 // Reflection support //////////////////////////////////////////////////////////////////////////////
1074 
1075 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1076   assert (cls != NULL, "illegal class");
1077   JVMWrapper("JVM_GetClassName");
1078   JvmtiVMObjectAllocEventCollector oam;
1079   ResourceMark rm(THREAD);
1080   const char* name;
1081   if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1082     name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1083   } else {
1084     // Consider caching interned string in Klass
1085     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1086     assert(k->is_klass(), "just checking");
1087     name = k->external_name();
1088   }
1089   oop result = StringTable::intern((char*) name, CHECK_NULL);
1090   return (jstring) JNIHandles::make_local(env, result);
1091 JVM_END
1092 
1093 
1094 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1095   JVMWrapper("JVM_GetClassInterfaces");
1096   JvmtiVMObjectAllocEventCollector oam;
1097   oop mirror = JNIHandles::resolve_non_null(cls);
1098 
1099   // Special handling for primitive objects
1100   if (java_lang_Class::is_primitive(mirror)) {
1101     // Primitive objects does not have any interfaces
1102     objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1103     return (jobjectArray) JNIHandles::make_local(env, r);
1104   }
1105 
1106   KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1107   // Figure size of result array
1108   int size;
1109   if (klass->is_instance_klass()) {
1110     size = InstanceKlass::cast(klass())->local_interfaces()->length();
1111   } else {
1112     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1113     size = 2;
1114   }
1115 
1116   // Allocate result array
1117   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1118   objArrayHandle result (THREAD, r);
1119   // Fill in result
1120   if (klass->is_instance_klass()) {
1121     // Regular instance klass, fill in all local interfaces
1122     for (int index = 0; index < size; index++) {
1123       Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1124       result->obj_at_put(index, k->java_mirror());
1125     }
1126   } else {
1127     // All arrays implement java.lang.Cloneable and java.io.Serializable
1128     result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1129     result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1130   }
1131   return (jobjectArray) JNIHandles::make_local(env, result());
1132 JVM_END
1133 
1134 
1135 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1136   JVMWrapper("JVM_IsInterface");
1137   oop mirror = JNIHandles::resolve_non_null(cls);
1138   if (java_lang_Class::is_primitive(mirror)) {
1139     return JNI_FALSE;
1140   }
1141   Klass* k = java_lang_Class::as_Klass(mirror);
1142   jboolean result = k->is_interface();
1143   assert(!result || k->is_instance_klass(),
1144          "all interfaces are instance types");
1145   // The compiler intrinsic for isInterface tests the
1146   // Klass::_access_flags bits in the same way.
1147   return result;
1148 JVM_END
1149 
1150 
1151 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1152   JVMWrapper("JVM_GetClassSigners");
1153   JvmtiVMObjectAllocEventCollector oam;
1154   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1155     // There are no signers for primitive types
1156     return NULL;
1157   }
1158 
1159   objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1160 
1161   // If there are no signers set in the class, or if the class
1162   // is an array, return NULL.
1163   if (signers == NULL) return NULL;
1164 
1165   // copy of the signers array
1166   Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1167   objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1168   for (int index = 0; index < signers->length(); index++) {
1169     signers_copy->obj_at_put(index, signers->obj_at(index));
1170   }
1171 
1172   // return the copy
1173   return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1174 JVM_END
1175 
1176 
1177 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1178   JVMWrapper("JVM_SetClassSigners");
1179   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1180     // This call is ignored for primitive types and arrays.
1181     // Signers are only set once, ClassLoader.java, and thus shouldn't
1182     // be called with an array.  Only the bootstrap loader creates arrays.
1183     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1184     if (k->is_instance_klass()) {
1185       java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1186     }
1187   }
1188 JVM_END
1189 
1190 
1191 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1192   JVMWrapper("JVM_GetProtectionDomain");
1193   if (JNIHandles::resolve(cls) == NULL) {
1194     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1195   }
1196 
1197   if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1198     // Primitive types does not have a protection domain.
1199     return NULL;
1200   }
1201 
1202   oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1203   return (jobject) JNIHandles::make_local(env, pd);
1204 JVM_END
1205 
1206 
1207 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1208   // If there is a security manager and protection domain, check the access
1209   // in the protection domain, otherwise it is authorized.
1210   if (java_lang_System::has_security_manager()) {
1211 
1212     // For bootstrapping, if pd implies method isn't in the JDK, allow
1213     // this context to revert to older behavior.
1214     // In this case the isAuthorized field in AccessControlContext is also not
1215     // present.
1216     if (Universe::protection_domain_implies_method() == NULL) {
1217       return true;
1218     }
1219 
1220     // Whitelist certain access control contexts
1221     if (java_security_AccessControlContext::is_authorized(context)) {
1222       return true;
1223     }
1224 
1225     oop prot = klass->protection_domain();
1226     if (prot != NULL) {
1227       // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1228       // in the new wrapper.
1229       methodHandle m(THREAD, Universe::protection_domain_implies_method());
1230       Handle h_prot(THREAD, prot);
1231       JavaValue result(T_BOOLEAN);
1232       JavaCallArguments args(h_prot);
1233       JavaCalls::call(&result, m, &args, CHECK_false);
1234       return (result.get_jboolean() != 0);
1235     }
1236   }
1237   return true;
1238 }
1239 
1240 // Create an AccessControlContext with a protection domain with null codesource
1241 // and null permissions - which gives no permissions.
1242 oop create_dummy_access_control_context(TRAPS) {
1243   InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1244   Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1245   // Call constructor ProtectionDomain(null, null);
1246   JavaValue result(T_VOID);
1247   JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1248                           vmSymbols::object_initializer_name(),
1249                           vmSymbols::codesource_permissioncollection_signature(),
1250                           Handle(), Handle(), CHECK_NULL);
1251 
1252   // new ProtectionDomain[] {pd};
1253   objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1254   context->obj_at_put(0, obj());
1255 
1256   // new AccessControlContext(new ProtectionDomain[] {pd})
1257   objArrayHandle h_context(THREAD, context);
1258   oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1259   return acc;
1260 }
1261 
1262 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1263   JVMWrapper("JVM_DoPrivileged");
1264 
1265   if (action == NULL) {
1266     THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1267   }
1268 
1269   // Compute the frame initiating the do privileged operation and setup the privileged stack
1270   vframeStream vfst(thread);
1271   vfst.security_get_caller_frame(1);
1272 
1273   if (vfst.at_end()) {
1274     THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1275   }
1276 
1277   Method* method        = vfst.method();
1278   instanceKlassHandle klass (THREAD, method->method_holder());
1279 
1280   // Check that action object understands "Object run()"
1281   Handle h_context;
1282   if (context != NULL) {
1283     h_context = Handle(THREAD, JNIHandles::resolve(context));
1284     bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1285     if (!authorized) {
1286       // Create an unprivileged access control object and call it's run function
1287       // instead.
1288       oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1289       h_context = Handle(THREAD, noprivs);
1290     }
1291   }
1292 
1293   // Check that action object understands "Object run()"
1294   Handle object (THREAD, JNIHandles::resolve(action));
1295 
1296   // get run() method
1297   Method* m_oop = object->klass()->uncached_lookup_method(
1298                                            vmSymbols::run_method_name(),
1299                                            vmSymbols::void_object_signature(),
1300                                            Klass::find_overpass);
1301   methodHandle m (THREAD, m_oop);
1302   if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1303     THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1304   }
1305 
1306   // Stack allocated list of privileged stack elements
1307   PrivilegedElement pi;
1308   if (!vfst.at_end()) {
1309     pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1310     thread->set_privileged_stack_top(&pi);
1311   }
1312 
1313 
1314   // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1315   // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1316   Handle pending_exception;
1317   JavaValue result(T_OBJECT);
1318   JavaCallArguments args(object);
1319   JavaCalls::call(&result, m, &args, THREAD);
1320 
1321   // done with action, remove ourselves from the list
1322   if (!vfst.at_end()) {
1323     assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1324     thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1325   }
1326 
1327   if (HAS_PENDING_EXCEPTION) {
1328     pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1329     CLEAR_PENDING_EXCEPTION;
1330     // JVMTI has already reported the pending exception
1331     // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1332     if (THREAD->is_Java_thread()) {
1333       JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1334     }
1335     if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1336         !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1337       // Throw a java.security.PrivilegedActionException(Exception e) exception
1338       JavaCallArguments args(pending_exception);
1339       THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1340                   vmSymbols::exception_void_signature(),
1341                   &args);
1342     }
1343   }
1344 
1345   if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1346   return JNIHandles::make_local(env, (oop) result.get_jobject());
1347 JVM_END
1348 
1349 
1350 // Returns the inherited_access_control_context field of the running thread.
1351 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1352   JVMWrapper("JVM_GetInheritedAccessControlContext");
1353   oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1354   return JNIHandles::make_local(env, result);
1355 JVM_END
1356 
1357 class RegisterArrayForGC {
1358  private:
1359   JavaThread *_thread;
1360  public:
1361   RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array)  {
1362     _thread = thread;
1363     _thread->register_array_for_gc(array);
1364   }
1365 
1366   ~RegisterArrayForGC() {
1367     _thread->register_array_for_gc(NULL);
1368   }
1369 };
1370 
1371 
1372 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1373   JVMWrapper("JVM_GetStackAccessControlContext");
1374   if (!UsePrivilegedStack) return NULL;
1375 
1376   ResourceMark rm(THREAD);
1377   GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1378   JvmtiVMObjectAllocEventCollector oam;
1379 
1380   // count the protection domains on the execution stack. We collapse
1381   // duplicate consecutive protection domains into a single one, as
1382   // well as stopping when we hit a privileged frame.
1383 
1384   // Use vframeStream to iterate through Java frames
1385   vframeStream vfst(thread);
1386 
1387   oop previous_protection_domain = NULL;
1388   Handle privileged_context(thread, NULL);
1389   bool is_privileged = false;
1390   oop protection_domain = NULL;
1391 
1392   for(; !vfst.at_end(); vfst.next()) {
1393     // get method of frame
1394     Method* method = vfst.method();
1395     intptr_t* frame_id   = vfst.frame_id();
1396 
1397     // check the privileged frames to see if we have a match
1398     if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1399       // this frame is privileged
1400       is_privileged = true;
1401       privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1402       protection_domain  = thread->privileged_stack_top()->protection_domain();
1403     } else {
1404       protection_domain = method->method_holder()->protection_domain();
1405     }
1406 
1407     if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1408       local_array->push(protection_domain);
1409       previous_protection_domain = protection_domain;
1410     }
1411 
1412     if (is_privileged) break;
1413   }
1414 
1415 
1416   // either all the domains on the stack were system domains, or
1417   // we had a privileged system domain
1418   if (local_array->is_empty()) {
1419     if (is_privileged && privileged_context.is_null()) return NULL;
1420 
1421     oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1422     return JNIHandles::make_local(env, result);
1423   }
1424 
1425   // the resource area must be registered in case of a gc
1426   RegisterArrayForGC ragc(thread, local_array);
1427   objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1428                                                  local_array->length(), CHECK_NULL);
1429   objArrayHandle h_context(thread, context);
1430   for (int index = 0; index < local_array->length(); index++) {
1431     h_context->obj_at_put(index, local_array->at(index));
1432   }
1433 
1434   oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1435 
1436   return JNIHandles::make_local(env, result);
1437 JVM_END
1438 
1439 
1440 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1441   JVMWrapper("JVM_IsArrayClass");
1442   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1443   return (k != NULL) && k->is_array_klass() ? true : false;
1444 JVM_END
1445 
1446 
1447 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1448   JVMWrapper("JVM_IsPrimitiveClass");
1449   oop mirror = JNIHandles::resolve_non_null(cls);
1450   return (jboolean) java_lang_Class::is_primitive(mirror);
1451 JVM_END
1452 
1453 
1454 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1455   JVMWrapper("JVM_GetClassModifiers");
1456   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1457     // Primitive type
1458     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1459   }
1460 
1461   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1462   debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1463   assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1464   return k->modifier_flags();
1465 JVM_END
1466 
1467 
1468 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1469 
1470 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1471   JvmtiVMObjectAllocEventCollector oam;
1472   // ofClass is a reference to a java_lang_Class object. The mirror object
1473   // of an InstanceKlass
1474 
1475   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1476       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1477     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1478     return (jobjectArray)JNIHandles::make_local(env, result);
1479   }
1480 
1481   instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1482   InnerClassesIterator iter(k);
1483 
1484   if (iter.length() == 0) {
1485     // Neither an inner nor outer class
1486     oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1487     return (jobjectArray)JNIHandles::make_local(env, result);
1488   }
1489 
1490   // find inner class info
1491   constantPoolHandle cp(thread, k->constants());
1492   int length = iter.length();
1493 
1494   // Allocate temp. result array
1495   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1496   objArrayHandle result (THREAD, r);
1497   int members = 0;
1498 
1499   for (; !iter.done(); iter.next()) {
1500     int ioff = iter.inner_class_info_index();
1501     int ooff = iter.outer_class_info_index();
1502 
1503     if (ioff != 0 && ooff != 0) {
1504       // Check to see if the name matches the class we're looking for
1505       // before attempting to find the class.
1506       if (cp->klass_name_at_matches(k, ooff)) {
1507         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1508         if (outer_klass == k()) {
1509            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1510            instanceKlassHandle inner_klass (THREAD, ik);
1511 
1512            // Throws an exception if outer klass has not declared k as
1513            // an inner klass
1514            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1515 
1516            result->obj_at_put(members, inner_klass->java_mirror());
1517            members++;
1518         }
1519       }
1520     }
1521   }
1522 
1523   if (members != length) {
1524     // Return array of right length
1525     objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1526     for(int i = 0; i < members; i++) {
1527       res->obj_at_put(i, result->obj_at(i));
1528     }
1529     return (jobjectArray)JNIHandles::make_local(env, res);
1530   }
1531 
1532   return (jobjectArray)JNIHandles::make_local(env, result());
1533 JVM_END
1534 
1535 
1536 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1537 {
1538   // ofClass is a reference to a java_lang_Class object.
1539   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1540       ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1541     return NULL;
1542   }
1543 
1544   bool inner_is_member = false;
1545   Klass* outer_klass
1546     = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1547                           )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1548   if (outer_klass == NULL)  return NULL;  // already a top-level class
1549   if (!inner_is_member)  return NULL;     // an anonymous class (inside a method)
1550   return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1551 }
1552 JVM_END
1553 
1554 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1555 {
1556   oop mirror = JNIHandles::resolve_non_null(cls);
1557   if (java_lang_Class::is_primitive(mirror) ||
1558       !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1559     return NULL;
1560   }
1561   instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror)));
1562   int ooff = 0, noff = 0;
1563   if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
1564     if (noff != 0) {
1565       constantPoolHandle i_cp(thread, k->constants());
1566       Symbol* name = i_cp->symbol_at(noff);
1567       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1568       return (jstring) JNIHandles::make_local(env, str());
1569     }
1570   }
1571   return NULL;
1572 }
1573 JVM_END
1574 
1575 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1576   assert (cls != NULL, "illegal class");
1577   JVMWrapper("JVM_GetClassSignature");
1578   JvmtiVMObjectAllocEventCollector oam;
1579   ResourceMark rm(THREAD);
1580   // Return null for arrays and primatives
1581   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1582     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1583     if (k->is_instance_klass()) {
1584       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1585       if (sym == NULL) return NULL;
1586       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1587       return (jstring) JNIHandles::make_local(env, str());
1588     }
1589   }
1590   return NULL;
1591 JVM_END
1592 
1593 
1594 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1595   assert (cls != NULL, "illegal class");
1596   JVMWrapper("JVM_GetClassAnnotations");
1597 
1598   // Return null for arrays and primitives
1599   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1600     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1601     if (k->is_instance_klass()) {
1602       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1603       return (jbyteArray) JNIHandles::make_local(env, a);
1604     }
1605   }
1606   return NULL;
1607 JVM_END
1608 
1609 
1610 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1611   // some of this code was adapted from from jni_FromReflectedField
1612 
1613   oop reflected = JNIHandles::resolve_non_null(field);
1614   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1615   Klass* k    = java_lang_Class::as_Klass(mirror);
1616   int slot      = java_lang_reflect_Field::slot(reflected);
1617   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1618 
1619   KlassHandle kh(THREAD, k);
1620   intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1621 
1622   if (modifiers & JVM_ACC_STATIC) {
1623     // for static fields we only look in the current class
1624     if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1625       assert(false, "cannot find static field");
1626       return false;
1627     }
1628   } else {
1629     // for instance fields we start with the current class and work
1630     // our way up through the superclass chain
1631     if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1632       assert(false, "cannot find instance field");
1633       return false;
1634     }
1635   }
1636   return true;
1637 }
1638 
1639 static Method* jvm_get_method_common(jobject method) {
1640   // some of this code was adapted from from jni_FromReflectedMethod
1641 
1642   oop reflected = JNIHandles::resolve_non_null(method);
1643   oop mirror    = NULL;
1644   int slot      = 0;
1645 
1646   if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1647     mirror = java_lang_reflect_Constructor::clazz(reflected);
1648     slot   = java_lang_reflect_Constructor::slot(reflected);
1649   } else {
1650     assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1651            "wrong type");
1652     mirror = java_lang_reflect_Method::clazz(reflected);
1653     slot   = java_lang_reflect_Method::slot(reflected);
1654   }
1655   Klass* k = java_lang_Class::as_Klass(mirror);
1656 
1657   Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1658   assert(m != NULL, "cannot find method");
1659   return m;  // caller has to deal with NULL in product mode
1660 }
1661 
1662 /* Type use annotations support (JDK 1.8) */
1663 
1664 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1665   assert (cls != NULL, "illegal class");
1666   JVMWrapper("JVM_GetClassTypeAnnotations");
1667   ResourceMark rm(THREAD);
1668   // Return null for arrays and primitives
1669   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1670     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1671     if (k->is_instance_klass()) {
1672       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1673       if (type_annotations != NULL) {
1674         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1675         return (jbyteArray) JNIHandles::make_local(env, a);
1676       }
1677     }
1678   }
1679   return NULL;
1680 JVM_END
1681 
1682 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1683   assert (method != NULL, "illegal method");
1684   JVMWrapper("JVM_GetMethodTypeAnnotations");
1685 
1686   // method is a handle to a java.lang.reflect.Method object
1687   Method* m = jvm_get_method_common(method);
1688   if (m == NULL) {
1689     return NULL;
1690   }
1691 
1692   AnnotationArray* type_annotations = m->type_annotations();
1693   if (type_annotations != NULL) {
1694     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1695     return (jbyteArray) JNIHandles::make_local(env, a);
1696   }
1697 
1698   return NULL;
1699 JVM_END
1700 
1701 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1702   assert (field != NULL, "illegal field");
1703   JVMWrapper("JVM_GetFieldTypeAnnotations");
1704 
1705   fieldDescriptor fd;
1706   bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1707   if (!gotFd) {
1708     return NULL;
1709   }
1710 
1711   return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1712 JVM_END
1713 
1714 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1715   if (!cp->is_within_bounds(index)) {
1716     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1717   }
1718 }
1719 
1720 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1721 {
1722   JVMWrapper("JVM_GetMethodParameters");
1723   // method is a handle to a java.lang.reflect.Method object
1724   Method* method_ptr = jvm_get_method_common(method);
1725   methodHandle mh (THREAD, method_ptr);
1726   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1727   const int num_params = mh->method_parameters_length();
1728 
1729   if (num_params < 0) {
1730     // A -1 return value from method_parameters_length means there is no
1731     // parameter data.  Return null to indicate this to the reflection
1732     // API.
1733     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1734     return (jobjectArray)NULL;
1735   } else {
1736     // Otherwise, we return something up to reflection, even if it is
1737     // a zero-length array.  Why?  Because in some cases this can
1738     // trigger a MalformedParametersException.
1739 
1740     // make sure all the symbols are properly formatted
1741     for (int i = 0; i < num_params; i++) {
1742       MethodParametersElement* params = mh->method_parameters_start();
1743       int index = params[i].name_cp_index;
1744       bounds_check(mh->constants(), index, CHECK_NULL);
1745 
1746       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1747         THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1748                     "Wrong type at constant pool index");
1749       }
1750 
1751     }
1752 
1753     objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1754     objArrayHandle result (THREAD, result_oop);
1755 
1756     for (int i = 0; i < num_params; i++) {
1757       MethodParametersElement* params = mh->method_parameters_start();
1758       // For a 0 index, give a NULL symbol
1759       Symbol* sym = 0 != params[i].name_cp_index ?
1760         mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1761       int flags = params[i].flags;
1762       oop param = Reflection::new_parameter(reflected_method, i, sym,
1763                                             flags, CHECK_NULL);
1764       result->obj_at_put(i, param);
1765     }
1766     return (jobjectArray)JNIHandles::make_local(env, result());
1767   }
1768 }
1769 JVM_END
1770 
1771 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1772 
1773 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1774 {
1775   JVMWrapper("JVM_GetClassDeclaredFields");
1776   JvmtiVMObjectAllocEventCollector oam;
1777 
1778   // Exclude primitive types and array types
1779   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1780       java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1781     // Return empty array
1782     oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1783     return (jobjectArray) JNIHandles::make_local(env, res);
1784   }
1785 
1786   instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1787   constantPoolHandle cp(THREAD, k->constants());
1788 
1789   // Ensure class is linked
1790   k->link_class(CHECK_NULL);
1791 
1792   // Allocate result
1793   int num_fields;
1794 
1795   if (publicOnly) {
1796     num_fields = 0;
1797     for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1798       if (fs.access_flags().is_public()) ++num_fields;
1799     }
1800   } else {
1801     num_fields = k->java_fields_count();
1802   }
1803 
1804   objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1805   objArrayHandle result (THREAD, r);
1806 
1807   int out_idx = 0;
1808   fieldDescriptor fd;
1809   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1810     if (!publicOnly || fs.access_flags().is_public()) {
1811       fd.reinitialize(k(), fs.index());
1812       oop field = Reflection::new_field(&fd, CHECK_NULL);
1813       result->obj_at_put(out_idx, field);
1814       ++out_idx;
1815     }
1816   }
1817   assert(out_idx == num_fields, "just checking");
1818   return (jobjectArray) JNIHandles::make_local(env, result());
1819 }
1820 JVM_END
1821 
1822 static bool select_method(methodHandle method, bool want_constructor) {
1823   if (want_constructor) {
1824     return (method->is_initializer() && !method->is_static());
1825   } else {
1826     return  (!method->is_initializer() && !method->is_overpass());
1827   }
1828 }
1829 
1830 static jobjectArray get_class_declared_methods_helper(
1831                                   JNIEnv *env,
1832                                   jclass ofClass, jboolean publicOnly,
1833                                   bool want_constructor,
1834                                   Klass* klass, TRAPS) {
1835 
1836   JvmtiVMObjectAllocEventCollector oam;
1837 
1838   // Exclude primitive types and array types
1839   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1840       || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1841     // Return empty array
1842     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1843     return (jobjectArray) JNIHandles::make_local(env, res);
1844   }
1845 
1846   instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1847 
1848   // Ensure class is linked
1849   k->link_class(CHECK_NULL);
1850 
1851   Array<Method*>* methods = k->methods();
1852   int methods_length = methods->length();
1853 
1854   // Save original method_idnum in case of redefinition, which can change
1855   // the idnum of obsolete methods.  The new method will have the same idnum
1856   // but if we refresh the methods array, the counts will be wrong.
1857   ResourceMark rm(THREAD);
1858   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1859   int num_methods = 0;
1860 
1861   for (int i = 0; i < methods_length; i++) {
1862     methodHandle method(THREAD, methods->at(i));
1863     if (select_method(method, want_constructor)) {
1864       if (!publicOnly || method->is_public()) {
1865         idnums->push(method->method_idnum());
1866         ++num_methods;
1867       }
1868     }
1869   }
1870 
1871   // Allocate result
1872   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1873   objArrayHandle result (THREAD, r);
1874 
1875   // Now just put the methods that we selected above, but go by their idnum
1876   // in case of redefinition.  The methods can be redefined at any safepoint,
1877   // so above when allocating the oop array and below when creating reflect
1878   // objects.
1879   for (int i = 0; i < num_methods; i++) {
1880     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1881     if (method.is_null()) {
1882       // Method may have been deleted and seems this API can handle null
1883       // Otherwise should probably put a method that throws NSME
1884       result->obj_at_put(i, NULL);
1885     } else {
1886       oop m;
1887       if (want_constructor) {
1888         m = Reflection::new_constructor(method, CHECK_NULL);
1889       } else {
1890         m = Reflection::new_method(method, false, CHECK_NULL);
1891       }
1892       result->obj_at_put(i, m);
1893     }
1894   }
1895 
1896   return (jobjectArray) JNIHandles::make_local(env, result());
1897 }
1898 
1899 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1900 {
1901   JVMWrapper("JVM_GetClassDeclaredMethods");
1902   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1903                                            /*want_constructor*/ false,
1904                                            SystemDictionary::reflect_Method_klass(), THREAD);
1905 }
1906 JVM_END
1907 
1908 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1909 {
1910   JVMWrapper("JVM_GetClassDeclaredConstructors");
1911   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1912                                            /*want_constructor*/ true,
1913                                            SystemDictionary::reflect_Constructor_klass(), THREAD);
1914 }
1915 JVM_END
1916 
1917 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1918 {
1919   JVMWrapper("JVM_GetClassAccessFlags");
1920   if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1921     // Primitive type
1922     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1923   }
1924 
1925   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1926   return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1927 }
1928 JVM_END
1929 
1930 
1931 // Constant pool access //////////////////////////////////////////////////////////
1932 
1933 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1934 {
1935   JVMWrapper("JVM_GetClassConstantPool");
1936   JvmtiVMObjectAllocEventCollector oam;
1937 
1938   // Return null for primitives and arrays
1939   if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1940     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1941     if (k->is_instance_klass()) {
1942       instanceKlassHandle k_h(THREAD, k);
1943       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1944       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1945       return JNIHandles::make_local(jcp());
1946     }
1947   }
1948   return NULL;
1949 }
1950 JVM_END
1951 
1952 
1953 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1954 {
1955   JVMWrapper("JVM_ConstantPoolGetSize");
1956   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1957   return cp->length();
1958 }
1959 JVM_END
1960 
1961 
1962 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1963 {
1964   JVMWrapper("JVM_ConstantPoolGetClassAt");
1965   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1966   bounds_check(cp, index, CHECK_NULL);
1967   constantTag tag = cp->tag_at(index);
1968   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1969     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1970   }
1971   Klass* k = cp->klass_at(index, CHECK_NULL);
1972   return (jclass) JNIHandles::make_local(k->java_mirror());
1973 }
1974 JVM_END
1975 
1976 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1977 {
1978   JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1979   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1980   bounds_check(cp, index, CHECK_NULL);
1981   constantTag tag = cp->tag_at(index);
1982   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1983     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1984   }
1985   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1986   if (k == NULL) return NULL;
1987   return (jclass) JNIHandles::make_local(k->java_mirror());
1988 }
1989 JVM_END
1990 
1991 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1992   constantTag tag = cp->tag_at(index);
1993   if (!tag.is_method() && !tag.is_interface_method()) {
1994     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1995   }
1996   int klass_ref  = cp->uncached_klass_ref_index_at(index);
1997   Klass* k_o;
1998   if (force_resolution) {
1999     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2000   } else {
2001     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2002     if (k_o == NULL) return NULL;
2003   }
2004   instanceKlassHandle k(THREAD, k_o);
2005   Symbol* name = cp->uncached_name_ref_at(index);
2006   Symbol* sig  = cp->uncached_signature_ref_at(index);
2007   methodHandle m (THREAD, k->find_method(name, sig));
2008   if (m.is_null()) {
2009     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2010   }
2011   oop method;
2012   if (!m->is_initializer() || m->is_static()) {
2013     method = Reflection::new_method(m, true, CHECK_NULL);
2014   } else {
2015     method = Reflection::new_constructor(m, CHECK_NULL);
2016   }
2017   return JNIHandles::make_local(method);
2018 }
2019 
2020 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2021 {
2022   JVMWrapper("JVM_ConstantPoolGetMethodAt");
2023   JvmtiVMObjectAllocEventCollector oam;
2024   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2025   bounds_check(cp, index, CHECK_NULL);
2026   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2027   return res;
2028 }
2029 JVM_END
2030 
2031 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2032 {
2033   JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2034   JvmtiVMObjectAllocEventCollector oam;
2035   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2036   bounds_check(cp, index, CHECK_NULL);
2037   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2038   return res;
2039 }
2040 JVM_END
2041 
2042 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2043   constantTag tag = cp->tag_at(index);
2044   if (!tag.is_field()) {
2045     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2046   }
2047   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2048   Klass* k_o;
2049   if (force_resolution) {
2050     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2051   } else {
2052     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2053     if (k_o == NULL) return NULL;
2054   }
2055   instanceKlassHandle k(THREAD, k_o);
2056   Symbol* name = cp->uncached_name_ref_at(index);
2057   Symbol* sig  = cp->uncached_signature_ref_at(index);
2058   fieldDescriptor fd;
2059   Klass* target_klass = k->find_field(name, sig, &fd);
2060   if (target_klass == NULL) {
2061     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2062   }
2063   oop field = Reflection::new_field(&fd, CHECK_NULL);
2064   return JNIHandles::make_local(field);
2065 }
2066 
2067 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2068 {
2069   JVMWrapper("JVM_ConstantPoolGetFieldAt");
2070   JvmtiVMObjectAllocEventCollector oam;
2071   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2072   bounds_check(cp, index, CHECK_NULL);
2073   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2074   return res;
2075 }
2076 JVM_END
2077 
2078 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2079 {
2080   JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2081   JvmtiVMObjectAllocEventCollector oam;
2082   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2083   bounds_check(cp, index, CHECK_NULL);
2084   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2085   return res;
2086 }
2087 JVM_END
2088 
2089 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2090 {
2091   JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2092   JvmtiVMObjectAllocEventCollector oam;
2093   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2094   bounds_check(cp, index, CHECK_NULL);
2095   constantTag tag = cp->tag_at(index);
2096   if (!tag.is_field_or_method()) {
2097     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2098   }
2099   int klass_ref = cp->uncached_klass_ref_index_at(index);
2100   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2101   Symbol*  member_name = cp->uncached_name_ref_at(index);
2102   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2103   objArrayOop  dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2104   objArrayHandle dest(THREAD, dest_o);
2105   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2106   dest->obj_at_put(0, str());
2107   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2108   dest->obj_at_put(1, str());
2109   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2110   dest->obj_at_put(2, str());
2111   return (jobjectArray) JNIHandles::make_local(dest());
2112 }
2113 JVM_END
2114 
2115 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2116 {
2117   JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2118   JvmtiVMObjectAllocEventCollector oam;
2119   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2120   bounds_check(cp, index, CHECK_0);
2121   constantTag tag = cp->tag_at(index);
2122   if (!tag.is_field_or_method()) {
2123     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2124   }
2125   return (jint) cp->uncached_klass_ref_index_at(index);
2126 }
2127 JVM_END
2128 
2129 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2130 {
2131   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2132   JvmtiVMObjectAllocEventCollector oam;
2133   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2134   bounds_check(cp, index, CHECK_0);
2135   constantTag tag = cp->tag_at(index);
2136   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2137     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2138   }
2139   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2140 }
2141 JVM_END
2142 
2143 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2144 {
2145   JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2146   JvmtiVMObjectAllocEventCollector oam;
2147   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2148   bounds_check(cp, index, CHECK_NULL);
2149   constantTag tag = cp->tag_at(index);
2150   if (!tag.is_name_and_type()) {
2151     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2152   }
2153   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2154   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2155   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2156   objArrayHandle dest(THREAD, dest_o);
2157   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2158   dest->obj_at_put(0, str());
2159   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2160   dest->obj_at_put(1, str());
2161   return (jobjectArray) JNIHandles::make_local(dest());
2162 }
2163 JVM_END
2164 
2165 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2166 {
2167   JVMWrapper("JVM_ConstantPoolGetIntAt");
2168   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2169   bounds_check(cp, index, CHECK_0);
2170   constantTag tag = cp->tag_at(index);
2171   if (!tag.is_int()) {
2172     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2173   }
2174   return cp->int_at(index);
2175 }
2176 JVM_END
2177 
2178 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2179 {
2180   JVMWrapper("JVM_ConstantPoolGetLongAt");
2181   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2182   bounds_check(cp, index, CHECK_(0L));
2183   constantTag tag = cp->tag_at(index);
2184   if (!tag.is_long()) {
2185     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2186   }
2187   return cp->long_at(index);
2188 }
2189 JVM_END
2190 
2191 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2192 {
2193   JVMWrapper("JVM_ConstantPoolGetFloatAt");
2194   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2195   bounds_check(cp, index, CHECK_(0.0f));
2196   constantTag tag = cp->tag_at(index);
2197   if (!tag.is_float()) {
2198     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2199   }
2200   return cp->float_at(index);
2201 }
2202 JVM_END
2203 
2204 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2205 {
2206   JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2207   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2208   bounds_check(cp, index, CHECK_(0.0));
2209   constantTag tag = cp->tag_at(index);
2210   if (!tag.is_double()) {
2211     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2212   }
2213   return cp->double_at(index);
2214 }
2215 JVM_END
2216 
2217 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2218 {
2219   JVMWrapper("JVM_ConstantPoolGetStringAt");
2220   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2221   bounds_check(cp, index, CHECK_NULL);
2222   constantTag tag = cp->tag_at(index);
2223   if (!tag.is_string()) {
2224     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2225   }
2226   oop str = cp->string_at(index, CHECK_NULL);
2227   return (jstring) JNIHandles::make_local(str);
2228 }
2229 JVM_END
2230 
2231 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2232 {
2233   JVMWrapper("JVM_ConstantPoolGetUTF8At");
2234   JvmtiVMObjectAllocEventCollector oam;
2235   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2236   bounds_check(cp, index, CHECK_NULL);
2237   constantTag tag = cp->tag_at(index);
2238   if (!tag.is_symbol()) {
2239     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2240   }
2241   Symbol* sym = cp->symbol_at(index);
2242   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2243   return (jstring) JNIHandles::make_local(str());
2244 }
2245 JVM_END
2246 
2247 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2248 {
2249   JVMWrapper("JVM_ConstantPoolGetTagAt");
2250   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2251   bounds_check(cp, index, CHECK_0);
2252   constantTag tag = cp->tag_at(index);
2253   jbyte result = tag.value();
2254   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2255   // they are changed to the corresponding tags from the JVM spec, so that java code in
2256   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2257   if (tag.is_klass_or_reference()) {
2258       result = JVM_CONSTANT_Class;
2259   } else if (tag.is_string_index()) {
2260       result = JVM_CONSTANT_String;
2261   } else if (tag.is_method_type_in_error()) {
2262       result = JVM_CONSTANT_MethodType;
2263   } else if (tag.is_method_handle_in_error()) {
2264       result = JVM_CONSTANT_MethodHandle;
2265   }
2266   return result;
2267 }
2268 JVM_END
2269 
2270 // Assertion support. //////////////////////////////////////////////////////////
2271 
2272 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2273   JVMWrapper("JVM_DesiredAssertionStatus");
2274   assert(cls != NULL, "bad class");
2275 
2276   oop r = JNIHandles::resolve(cls);
2277   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2278   if (java_lang_Class::is_primitive(r)) return false;
2279 
2280   Klass* k = java_lang_Class::as_Klass(r);
2281   assert(k->is_instance_klass(), "must be an instance klass");
2282   if (!k->is_instance_klass()) return false;
2283 
2284   ResourceMark rm(THREAD);
2285   const char* name = k->name()->as_C_string();
2286   bool system_class = k->class_loader() == NULL;
2287   return JavaAssertions::enabled(name, system_class);
2288 
2289 JVM_END
2290 
2291 
2292 // Return a new AssertionStatusDirectives object with the fields filled in with
2293 // command-line assertion arguments (i.e., -ea, -da).
2294 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2295   JVMWrapper("JVM_AssertionStatusDirectives");
2296   JvmtiVMObjectAllocEventCollector oam;
2297   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2298   return JNIHandles::make_local(env, asd);
2299 JVM_END
2300 
2301 // Verification ////////////////////////////////////////////////////////////////////////////////
2302 
2303 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2304 
2305 // RedefineClasses support: bug 6214132 caused verification to fail.
2306 // All functions from this section should call the jvmtiThreadSate function:
2307 //   Klass* class_to_verify_considering_redefinition(Klass* klass).
2308 // The function returns a Klass* of the _scratch_class if the verifier
2309 // was invoked in the middle of the class redefinition.
2310 // Otherwise it returns its argument value which is the _the_class Klass*.
2311 // Please, refer to the description in the jvmtiThreadSate.hpp.
2312 
2313 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2314   JVMWrapper("JVM_GetClassNameUTF");
2315   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2316   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2317   return k->name()->as_utf8();
2318 JVM_END
2319 
2320 
2321 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2322   JVMWrapper("JVM_GetClassCPTypes");
2323   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2324   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2325   // types will have length zero if this is not an InstanceKlass
2326   // (length is determined by call to JVM_GetClassCPEntriesCount)
2327   if (k->is_instance_klass()) {
2328     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2329     for (int index = cp->length() - 1; index >= 0; index--) {
2330       constantTag tag = cp->tag_at(index);
2331       types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2332     }
2333   }
2334 JVM_END
2335 
2336 
2337 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2338   JVMWrapper("JVM_GetClassCPEntriesCount");
2339   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2340   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2341   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2342 JVM_END
2343 
2344 
2345 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2346   JVMWrapper("JVM_GetClassFieldsCount");
2347   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2348   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2349   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2350 JVM_END
2351 
2352 
2353 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2354   JVMWrapper("JVM_GetClassMethodsCount");
2355   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2356   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2357   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2358 JVM_END
2359 
2360 
2361 // The following methods, used for the verifier, are never called with
2362 // array klasses, so a direct cast to InstanceKlass is safe.
2363 // Typically, these methods are called in a loop with bounds determined
2364 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2365 // zero for arrays.
2366 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2367   JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2368   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2369   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2370   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2371   int length = method->checked_exceptions_length();
2372   if (length > 0) {
2373     CheckedExceptionElement* table= method->checked_exceptions_start();
2374     for (int i = 0; i < length; i++) {
2375       exceptions[i] = table[i].class_cp_index;
2376     }
2377   }
2378 JVM_END
2379 
2380 
2381 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2382   JVMWrapper("JVM_GetMethodIxExceptionsCount");
2383   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2384   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2385   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2386   return method->checked_exceptions_length();
2387 JVM_END
2388 
2389 
2390 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2391   JVMWrapper("JVM_GetMethodIxByteCode");
2392   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2393   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2394   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2395   memcpy(code, method->code_base(), method->code_size());
2396 JVM_END
2397 
2398 
2399 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2400   JVMWrapper("JVM_GetMethodIxByteCodeLength");
2401   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2402   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2403   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2404   return method->code_size();
2405 JVM_END
2406 
2407 
2408 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2409   JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2410   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2411   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2412   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2413   ExceptionTable extable(method);
2414   entry->start_pc   = extable.start_pc(entry_index);
2415   entry->end_pc     = extable.end_pc(entry_index);
2416   entry->handler_pc = extable.handler_pc(entry_index);
2417   entry->catchType  = extable.catch_type_index(entry_index);
2418 JVM_END
2419 
2420 
2421 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2422   JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2423   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2424   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2425   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2426   return method->exception_table_length();
2427 JVM_END
2428 
2429 
2430 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2431   JVMWrapper("JVM_GetMethodIxModifiers");
2432   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2433   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2434   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2435   return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2436 JVM_END
2437 
2438 
2439 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2440   JVMWrapper("JVM_GetFieldIxModifiers");
2441   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2442   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2443   return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2444 JVM_END
2445 
2446 
2447 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2448   JVMWrapper("JVM_GetMethodIxLocalsCount");
2449   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2450   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2451   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2452   return method->max_locals();
2453 JVM_END
2454 
2455 
2456 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2457   JVMWrapper("JVM_GetMethodIxArgsSize");
2458   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2459   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2460   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2461   return method->size_of_parameters();
2462 JVM_END
2463 
2464 
2465 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2466   JVMWrapper("JVM_GetMethodIxMaxStack");
2467   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2468   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2469   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2470   return method->verifier_max_stack();
2471 JVM_END
2472 
2473 
2474 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2475   JVMWrapper("JVM_IsConstructorIx");
2476   ResourceMark rm(THREAD);
2477   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2478   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2479   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2480   return method->name() == vmSymbols::object_initializer_name();
2481 JVM_END
2482 
2483 
2484 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2485   JVMWrapper("JVM_IsVMGeneratedMethodIx");
2486   ResourceMark rm(THREAD);
2487   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2488   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2489   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2490   return method->is_overpass();
2491 JVM_END
2492 
2493 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2494   JVMWrapper("JVM_GetMethodIxIxUTF");
2495   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2496   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2497   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2498   return method->name()->as_utf8();
2499 JVM_END
2500 
2501 
2502 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2503   JVMWrapper("JVM_GetMethodIxSignatureUTF");
2504   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2505   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2506   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2507   return method->signature()->as_utf8();
2508 JVM_END
2509 
2510 /**
2511  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2512  * read entries in the constant pool.  Since the old verifier always
2513  * works on a copy of the code, it will not see any rewriting that
2514  * may possibly occur in the middle of verification.  So it is important
2515  * that nothing it calls tries to use the cpCache instead of the raw
2516  * constant pool, so we must use cp->uncached_x methods when appropriate.
2517  */
2518 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2519   JVMWrapper("JVM_GetCPFieldNameUTF");
2520   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2521   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2522   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2523   switch (cp->tag_at(cp_index).value()) {
2524     case JVM_CONSTANT_Fieldref:
2525       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2526     default:
2527       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2528   }
2529   ShouldNotReachHere();
2530   return NULL;
2531 JVM_END
2532 
2533 
2534 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2535   JVMWrapper("JVM_GetCPMethodNameUTF");
2536   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2537   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2538   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2539   switch (cp->tag_at(cp_index).value()) {
2540     case JVM_CONSTANT_InterfaceMethodref:
2541     case JVM_CONSTANT_Methodref:
2542     case JVM_CONSTANT_NameAndType:  // for invokedynamic
2543       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2544     default:
2545       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2546   }
2547   ShouldNotReachHere();
2548   return NULL;
2549 JVM_END
2550 
2551 
2552 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2553   JVMWrapper("JVM_GetCPMethodSignatureUTF");
2554   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2555   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2556   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2557   switch (cp->tag_at(cp_index).value()) {
2558     case JVM_CONSTANT_InterfaceMethodref:
2559     case JVM_CONSTANT_Methodref:
2560     case JVM_CONSTANT_NameAndType:  // for invokedynamic
2561       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2562     default:
2563       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2564   }
2565   ShouldNotReachHere();
2566   return NULL;
2567 JVM_END
2568 
2569 
2570 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2571   JVMWrapper("JVM_GetCPFieldSignatureUTF");
2572   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2573   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2574   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2575   switch (cp->tag_at(cp_index).value()) {
2576     case JVM_CONSTANT_Fieldref:
2577       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2578     default:
2579       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2580   }
2581   ShouldNotReachHere();
2582   return NULL;
2583 JVM_END
2584 
2585 
2586 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2587   JVMWrapper("JVM_GetCPClassNameUTF");
2588   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2589   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2590   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2591   Symbol* classname = cp->klass_name_at(cp_index);
2592   return classname->as_utf8();
2593 JVM_END
2594 
2595 
2596 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2597   JVMWrapper("JVM_GetCPFieldClassNameUTF");
2598   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2599   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2600   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2601   switch (cp->tag_at(cp_index).value()) {
2602     case JVM_CONSTANT_Fieldref: {
2603       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2604       Symbol* classname = cp->klass_name_at(class_index);
2605       return classname->as_utf8();
2606     }
2607     default:
2608       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2609   }
2610   ShouldNotReachHere();
2611   return NULL;
2612 JVM_END
2613 
2614 
2615 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2616   JVMWrapper("JVM_GetCPMethodClassNameUTF");
2617   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2618   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2619   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2620   switch (cp->tag_at(cp_index).value()) {
2621     case JVM_CONSTANT_Methodref:
2622     case JVM_CONSTANT_InterfaceMethodref: {
2623       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2624       Symbol* classname = cp->klass_name_at(class_index);
2625       return classname->as_utf8();
2626     }
2627     default:
2628       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2629   }
2630   ShouldNotReachHere();
2631   return NULL;
2632 JVM_END
2633 
2634 
2635 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2636   JVMWrapper("JVM_GetCPFieldModifiers");
2637   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2638   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2639   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2640   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2641   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2642   ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2643   switch (cp->tag_at(cp_index).value()) {
2644     case JVM_CONSTANT_Fieldref: {
2645       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2646       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2647       for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2648         if (fs.name() == name && fs.signature() == signature) {
2649           return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2650         }
2651       }
2652       return -1;
2653     }
2654     default:
2655       fatal("JVM_GetCPFieldModifiers: illegal constant");
2656   }
2657   ShouldNotReachHere();
2658   return 0;
2659 JVM_END
2660 
2661 
2662 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2663   JVMWrapper("JVM_GetCPMethodModifiers");
2664   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2665   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2666   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2667   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2668   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2669   switch (cp->tag_at(cp_index).value()) {
2670     case JVM_CONSTANT_Methodref:
2671     case JVM_CONSTANT_InterfaceMethodref: {
2672       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2673       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2674       Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2675       int methods_count = methods->length();
2676       for (int i = 0; i < methods_count; i++) {
2677         Method* method = methods->at(i);
2678         if (method->name() == name && method->signature() == signature) {
2679             return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2680         }
2681       }
2682       return -1;
2683     }
2684     default:
2685       fatal("JVM_GetCPMethodModifiers: illegal constant");
2686   }
2687   ShouldNotReachHere();
2688   return 0;
2689 JVM_END
2690 
2691 
2692 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2693 
2694 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2695   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2696 JVM_END
2697 
2698 
2699 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2700   JVMWrapper("JVM_IsSameClassPackage");
2701   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2702   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2703   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2704   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2705   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2706 JVM_END
2707 
2708 // Printing support //////////////////////////////////////////////////
2709 extern "C" {
2710 
2711 ATTRIBUTE_PRINTF(3, 0)
2712 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2713   // see bug 4399518, 4417214
2714   if ((intptr_t)count <= 0) return -1;
2715 
2716   int result = vsnprintf(str, count, fmt, args);
2717   // Note: on truncation vsnprintf(3) on Unix returns numbers of
2718   // characters which would have been written had the buffer been large
2719   // enough; on Windows, it returns -1. We handle both cases here and
2720   // always return -1, and perform null termination.
2721   if ((result > 0 && (size_t)result >= count) || result == -1) {
2722     str[count - 1] = '\0';
2723     result = -1;
2724   }
2725 
2726   return result;
2727 }
2728 
2729 ATTRIBUTE_PRINTF(3, 0)
2730 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2731   va_list args;
2732   int len;
2733   va_start(args, fmt);
2734   len = jio_vsnprintf(str, count, fmt, args);
2735   va_end(args);
2736   return len;
2737 }
2738 
2739 ATTRIBUTE_PRINTF(2,3)
2740 int jio_fprintf(FILE* f, const char *fmt, ...) {
2741   int len;
2742   va_list args;
2743   va_start(args, fmt);
2744   len = jio_vfprintf(f, fmt, args);
2745   va_end(args);
2746   return len;
2747 }
2748 
2749 ATTRIBUTE_PRINTF(2, 0)
2750 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2751   if (Arguments::vfprintf_hook() != NULL) {
2752      return Arguments::vfprintf_hook()(f, fmt, args);
2753   } else {
2754     return vfprintf(f, fmt, args);
2755   }
2756 }
2757 
2758 ATTRIBUTE_PRINTF(1, 2)
2759 JNIEXPORT int jio_printf(const char *fmt, ...) {
2760   int len;
2761   va_list args;
2762   va_start(args, fmt);
2763   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2764   va_end(args);
2765   return len;
2766 }
2767 
2768 
2769 // HotSpot specific jio method
2770 void jio_print(const char* s) {
2771   // Try to make this function as atomic as possible.
2772   if (Arguments::vfprintf_hook() != NULL) {
2773     jio_fprintf(defaultStream::output_stream(), "%s", s);
2774   } else {
2775     // Make an unused local variable to avoid warning from gcc 4.x compiler.
2776     size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2777   }
2778 }
2779 
2780 } // Extern C
2781 
2782 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2783 
2784 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2785 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2786 // OSThread objects.  The exception to this rule is when the target object is the thread
2787 // doing the operation, in which case we know that the thread won't exit until the
2788 // operation is done (all exits being voluntary).  There are a few cases where it is
2789 // rather silly to do operations on yourself, like resuming yourself or asking whether
2790 // you are alive.  While these can still happen, they are not subject to deadlocks if
2791 // the lock is held while the operation occurs (this is not the case for suspend, for
2792 // instance), and are very unlikely.  Because IsAlive needs to be fast and its
2793 // implementation is local to this file, we always lock Threads_lock for that one.
2794 
2795 static void thread_entry(JavaThread* thread, TRAPS) {
2796   HandleMark hm(THREAD);
2797   Handle obj(THREAD, thread->threadObj());
2798   JavaValue result(T_VOID);
2799   JavaCalls::call_virtual(&result,
2800                           obj,
2801                           KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2802                           vmSymbols::run_method_name(),
2803                           vmSymbols::void_method_signature(),
2804                           THREAD);
2805 }
2806 
2807 
2808 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2809   JVMWrapper("JVM_StartThread");
2810   JavaThread *native_thread = NULL;
2811 
2812   // We cannot hold the Threads_lock when we throw an exception,
2813   // due to rank ordering issues. Example:  we might need to grab the
2814   // Heap_lock while we construct the exception.
2815   bool throw_illegal_thread_state = false;
2816 
2817   // We must release the Threads_lock before we can post a jvmti event
2818   // in Thread::start.
2819   {
2820     // Ensure that the C++ Thread and OSThread structures aren't freed before
2821     // we operate.
2822     MutexLocker mu(Threads_lock);
2823 
2824     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2825     // re-starting an already started thread, so we should usually find
2826     // that the JavaThread is null. However for a JNI attached thread
2827     // there is a small window between the Thread object being created
2828     // (with its JavaThread set) and the update to its threadStatus, so we
2829     // have to check for this
2830     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2831       throw_illegal_thread_state = true;
2832     } else {
2833       // We could also check the stillborn flag to see if this thread was already stopped, but
2834       // for historical reasons we let the thread detect that itself when it starts running
2835 
2836       jlong size =
2837              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2838       // Allocate the C++ Thread structure and create the native thread.  The
2839       // stack size retrieved from java is signed, but the constructor takes
2840       // size_t (an unsigned type), so avoid passing negative values which would
2841       // result in really large stacks.
2842       size_t sz = size > 0 ? (size_t) size : 0;
2843       native_thread = new JavaThread(&thread_entry, sz);
2844 
2845       // At this point it may be possible that no osthread was created for the
2846       // JavaThread due to lack of memory. Check for this situation and throw
2847       // an exception if necessary. Eventually we may want to change this so
2848       // that we only grab the lock if the thread was created successfully -
2849       // then we can also do this check and throw the exception in the
2850       // JavaThread constructor.
2851       if (native_thread->osthread() != NULL) {
2852         // Note: the current thread is not being used within "prepare".
2853         native_thread->prepare(jthread);
2854       }
2855     }
2856   }
2857 
2858   if (throw_illegal_thread_state) {
2859     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2860   }
2861 
2862   assert(native_thread != NULL, "Starting null thread?");
2863 
2864   if (native_thread->osthread() == NULL) {
2865     // No one should hold a reference to the 'native_thread'.
2866     delete native_thread;
2867     if (JvmtiExport::should_post_resource_exhausted()) {
2868       JvmtiExport::post_resource_exhausted(
2869         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2870         os::native_thread_creation_failed_msg());
2871     }
2872     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2873               os::native_thread_creation_failed_msg());
2874   }
2875 
2876   Thread::start(native_thread);
2877 
2878 JVM_END
2879 
2880 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2881 // before the quasi-asynchronous exception is delivered.  This is a little obtrusive,
2882 // but is thought to be reliable and simple. In the case, where the receiver is the
2883 // same thread as the sender, no safepoint is needed.
2884 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2885   JVMWrapper("JVM_StopThread");
2886 
2887   oop java_throwable = JNIHandles::resolve(throwable);
2888   if (java_throwable == NULL) {
2889     THROW(vmSymbols::java_lang_NullPointerException());
2890   }
2891   oop java_thread = JNIHandles::resolve_non_null(jthread);
2892   JavaThread* receiver = java_lang_Thread::thread(java_thread);
2893   Events::log_exception(JavaThread::current(),
2894                         "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2895                         p2i(receiver), p2i((address)java_thread), p2i(throwable));
2896   // First check if thread is alive
2897   if (receiver != NULL) {
2898     // Check if exception is getting thrown at self (use oop equality, since the
2899     // target object might exit)
2900     if (java_thread == thread->threadObj()) {
2901       THROW_OOP(java_throwable);
2902     } else {
2903       // Enques a VM_Operation to stop all threads and then deliver the exception...
2904       Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2905     }
2906   }
2907   else {
2908     // Either:
2909     // - target thread has not been started before being stopped, or
2910     // - target thread already terminated
2911     // We could read the threadStatus to determine which case it is
2912     // but that is overkill as it doesn't matter. We must set the
2913     // stillborn flag for the first case, and if the thread has already
2914     // exited setting this flag has no affect
2915     java_lang_Thread::set_stillborn(java_thread);
2916   }
2917 JVM_END
2918 
2919 
2920 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2921   JVMWrapper("JVM_IsThreadAlive");
2922 
2923   oop thread_oop = JNIHandles::resolve_non_null(jthread);
2924   return java_lang_Thread::is_alive(thread_oop);
2925 JVM_END
2926 
2927 
2928 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2929   JVMWrapper("JVM_SuspendThread");
2930   oop java_thread = JNIHandles::resolve_non_null(jthread);
2931   JavaThread* receiver = java_lang_Thread::thread(java_thread);
2932 
2933   if (receiver != NULL) {
2934     // thread has run and has not exited (still on threads list)
2935 
2936     {
2937       MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2938       if (receiver->is_external_suspend()) {
2939         // Don't allow nested external suspend requests. We can't return
2940         // an error from this interface so just ignore the problem.
2941         return;
2942       }
2943       if (receiver->is_exiting()) { // thread is in the process of exiting
2944         return;
2945       }
2946       receiver->set_external_suspend();
2947     }
2948 
2949     // java_suspend() will catch threads in the process of exiting
2950     // and will ignore them.
2951     receiver->java_suspend();
2952 
2953     // It would be nice to have the following assertion in all the
2954     // time, but it is possible for a racing resume request to have
2955     // resumed this thread right after we suspended it. Temporarily
2956     // enable this assertion if you are chasing a different kind of
2957     // bug.
2958     //
2959     // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2960     //   receiver->is_being_ext_suspended(), "thread is not suspended");
2961   }
2962 JVM_END
2963 
2964 
2965 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2966   JVMWrapper("JVM_ResumeThread");
2967   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2968   // We need to *always* get the threads lock here, since this operation cannot be allowed during
2969   // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2970   // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2971   // looks at it.
2972   MutexLocker ml(Threads_lock);
2973   JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2974   if (thr != NULL) {
2975     // the thread has run and is not in the process of exiting
2976     thr->java_resume();
2977   }
2978 JVM_END
2979 
2980 
2981 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2982   JVMWrapper("JVM_SetThreadPriority");
2983   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2984   MutexLocker ml(Threads_lock);
2985   oop java_thread = JNIHandles::resolve_non_null(jthread);
2986   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2987   JavaThread* thr = java_lang_Thread::thread(java_thread);
2988   if (thr != NULL) {                  // Thread not yet started; priority pushed down when it is
2989     Thread::set_priority(thr, (ThreadPriority)prio);
2990   }
2991 JVM_END
2992 
2993 
2994 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2995   JVMWrapper("JVM_Yield");
2996   if (os::dont_yield()) return;
2997   HOTSPOT_THREAD_YIELD();
2998 
2999   // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
3000   // Critical for similar threading behaviour
3001   if (ConvertYieldToSleep) {
3002     os::sleep(thread, MinSleepInterval, false);
3003   } else {
3004     os::naked_yield();
3005   }
3006 JVM_END
3007 
3008 
3009 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3010   JVMWrapper("JVM_Sleep");
3011 
3012   if (millis < 0) {
3013     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3014   }
3015 
3016   if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3017     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3018   }
3019 
3020   // Save current thread state and restore it at the end of this block.
3021   // And set new thread state to SLEEPING.
3022   JavaThreadSleepState jtss(thread);
3023 
3024   HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3025 
3026   EventThreadSleep event;
3027 
3028   if (millis == 0) {
3029     // When ConvertSleepToYield is on, this matches the classic VM implementation of
3030     // JVM_Sleep. Critical for similar threading behaviour (Win32)
3031     // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
3032     // for SOLARIS
3033     if (ConvertSleepToYield) {
3034       os::naked_yield();
3035     } else {
3036       ThreadState old_state = thread->osthread()->get_state();
3037       thread->osthread()->set_state(SLEEPING);
3038       os::sleep(thread, MinSleepInterval, false);
3039       thread->osthread()->set_state(old_state);
3040     }
3041   } else {
3042     ThreadState old_state = thread->osthread()->get_state();
3043     thread->osthread()->set_state(SLEEPING);
3044     if (os::sleep(thread, millis, true) == OS_INTRPT) {
3045       // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3046       // us while we were sleeping. We do not overwrite those.
3047       if (!HAS_PENDING_EXCEPTION) {
3048         if (event.should_commit()) {
3049           event.set_time(millis);
3050           event.commit();
3051         }
3052         HOTSPOT_THREAD_SLEEP_END(1);
3053 
3054         // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3055         // to properly restore the thread state.  That's likely wrong.
3056         THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3057       }
3058     }
3059     thread->osthread()->set_state(old_state);
3060   }
3061   if (event.should_commit()) {
3062     event.set_time(millis);
3063     event.commit();
3064   }
3065   HOTSPOT_THREAD_SLEEP_END(0);
3066 JVM_END
3067 
3068 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3069   JVMWrapper("JVM_CurrentThread");
3070   oop jthread = thread->threadObj();
3071   assert (thread != NULL, "no current thread!");
3072   return JNIHandles::make_local(env, jthread);
3073 JVM_END
3074 
3075 
3076 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3077   JVMWrapper("JVM_CountStackFrames");
3078 
3079   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3080   oop java_thread = JNIHandles::resolve_non_null(jthread);
3081   bool throw_illegal_thread_state = false;
3082   int count = 0;
3083 
3084   {
3085     MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3086     // We need to re-resolve the java_thread, since a GC might have happened during the
3087     // acquire of the lock
3088     JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3089 
3090     if (thr == NULL) {
3091       // do nothing
3092     } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3093       // Check whether this java thread has been suspended already. If not, throws
3094       // IllegalThreadStateException. We defer to throw that exception until
3095       // Threads_lock is released since loading exception class has to leave VM.
3096       // The correct way to test a thread is actually suspended is
3097       // wait_for_ext_suspend_completion(), but we can't call that while holding
3098       // the Threads_lock. The above tests are sufficient for our purposes
3099       // provided the walkability of the stack is stable - which it isn't
3100       // 100% but close enough for most practical purposes.
3101       throw_illegal_thread_state = true;
3102     } else {
3103       // Count all java activation, i.e., number of vframes
3104       for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3105         // Native frames are not counted
3106         if (!vfst.method()->is_native()) count++;
3107        }
3108     }
3109   }
3110 
3111   if (throw_illegal_thread_state) {
3112     THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3113                 "this thread is not suspended");
3114   }
3115   return count;
3116 JVM_END
3117 
3118 // Consider: A better way to implement JVM_Interrupt() is to acquire
3119 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3120 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3121 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3122 // outside the critical section.  Threads_lock is hot so we want to minimize
3123 // the hold-time.  A cleaner interface would be to decompose interrupt into
3124 // two steps.  The 1st phase, performed under Threads_lock, would return
3125 // a closure that'd be invoked after Threads_lock was dropped.
3126 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3127 // admit spurious wakeups.
3128 
3129 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3130   JVMWrapper("JVM_Interrupt");
3131 
3132   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3133   oop java_thread = JNIHandles::resolve_non_null(jthread);
3134   MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3135   // We need to re-resolve the java_thread, since a GC might have happened during the
3136   // acquire of the lock
3137   JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3138   if (thr != NULL) {
3139     Thread::interrupt(thr);
3140   }
3141 JVM_END
3142 
3143 
3144 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3145   JVMWrapper("JVM_IsInterrupted");
3146 
3147   // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3148   oop java_thread = JNIHandles::resolve_non_null(jthread);
3149   MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3150   // We need to re-resolve the java_thread, since a GC might have happened during the
3151   // acquire of the lock
3152   JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3153   if (thr == NULL) {
3154     return JNI_FALSE;
3155   } else {
3156     return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3157   }
3158 JVM_END
3159 
3160 
3161 // Return true iff the current thread has locked the object passed in
3162 
3163 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3164   JVMWrapper("JVM_HoldsLock");
3165   assert(THREAD->is_Java_thread(), "sanity check");
3166   if (obj == NULL) {
3167     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3168   }
3169   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3170   return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3171 JVM_END
3172 
3173 
3174 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3175   JVMWrapper("JVM_DumpAllStacks");
3176   VM_PrintThreads op;
3177   VMThread::execute(&op);
3178   if (JvmtiExport::should_post_data_dump()) {
3179     JvmtiExport::post_data_dump();
3180   }
3181 JVM_END
3182 
3183 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3184   JVMWrapper("JVM_SetNativeThreadName");
3185   ResourceMark rm(THREAD);
3186   oop java_thread = JNIHandles::resolve_non_null(jthread);
3187   JavaThread* thr = java_lang_Thread::thread(java_thread);
3188   // Thread naming only supported for the current thread, doesn't work for
3189   // target threads.
3190   if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3191     // we don't set the name of an attached thread to avoid stepping
3192     // on other programs
3193     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3194     os::set_native_thread_name(thread_name);
3195   }
3196 JVM_END
3197 
3198 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3199 
3200 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3201   assert(jthread->is_Java_thread(), "must be a Java thread");
3202   if (jthread->privileged_stack_top() == NULL) return false;
3203   if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3204     oop loader = jthread->privileged_stack_top()->class_loader();
3205     if (loader == NULL) return true;
3206     bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3207     if (trusted) return true;
3208   }
3209   return false;
3210 }
3211 
3212 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3213   JVMWrapper("JVM_CurrentLoadedClass");
3214   ResourceMark rm(THREAD);
3215 
3216   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
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       oop loader = holder->class_loader();
3225       if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3226         return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3227       }
3228     }
3229   }
3230   return NULL;
3231 JVM_END
3232 
3233 
3234 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3235   JVMWrapper("JVM_CurrentClassLoader");
3236   ResourceMark rm(THREAD);
3237 
3238   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3239 
3240     // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3241     bool trusted = is_trusted_frame(thread, &vfst);
3242     if (trusted) return NULL;
3243 
3244     Method* m = vfst.method();
3245     if (!m->is_native()) {
3246       InstanceKlass* holder = m->method_holder();
3247       assert(holder->is_klass(), "just checking");
3248       oop loader = holder->class_loader();
3249       if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3250         return JNIHandles::make_local(env, loader);
3251       }
3252     }
3253   }
3254   return NULL;
3255 JVM_END
3256 
3257 
3258 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3259   JVMWrapper("JVM_GetClassContext");
3260   ResourceMark rm(THREAD);
3261   JvmtiVMObjectAllocEventCollector oam;
3262   vframeStream vfst(thread);
3263 
3264   if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3265     // This must only be called from SecurityManager.getClassContext
3266     Method* m = vfst.method();
3267     if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3268           m->name()          == vmSymbols::getClassContext_name() &&
3269           m->signature()     == vmSymbols::void_class_array_signature())) {
3270       THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3271     }
3272   }
3273 
3274   // Collect method holders
3275   GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3276   for (; !vfst.at_end(); vfst.security_next()) {
3277     Method* m = vfst.method();
3278     // Native frames are not returned
3279     if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3280       Klass* holder = m->method_holder();
3281       assert(holder->is_klass(), "just checking");
3282       klass_array->append(holder);
3283     }
3284   }
3285 
3286   // Create result array of type [Ljava/lang/Class;
3287   objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3288   // Fill in mirrors corresponding to method holders
3289   for (int i = 0; i < klass_array->length(); i++) {
3290     result->obj_at_put(i, klass_array->at(i)->java_mirror());
3291   }
3292 
3293   return (jobjectArray) JNIHandles::make_local(env, result);
3294 JVM_END
3295 
3296 
3297 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3298   JVMWrapper("JVM_ClassDepth");
3299   ResourceMark rm(THREAD);
3300   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3301   Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3302 
3303   const char* str = java_lang_String::as_utf8_string(class_name_str());
3304   TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3305   if (class_name_sym == NULL) {
3306     return -1;
3307   }
3308 
3309   int depth = 0;
3310 
3311   for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3312     if (!vfst.method()->is_native()) {
3313       InstanceKlass* holder = vfst.method()->method_holder();
3314       assert(holder->is_klass(), "just checking");
3315       if (holder->name() == class_name_sym) {
3316         return depth;
3317       }
3318       depth++;
3319     }
3320   }
3321   return -1;
3322 JVM_END
3323 
3324 
3325 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3326   JVMWrapper("JVM_ClassLoaderDepth");
3327   ResourceMark rm(THREAD);
3328   int depth = 0;
3329   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3330     // if a method in a class in a trusted loader is in a doPrivileged, return -1
3331     bool trusted = is_trusted_frame(thread, &vfst);
3332     if (trusted) return -1;
3333 
3334     Method* m = vfst.method();
3335     if (!m->is_native()) {
3336       InstanceKlass* holder = m->method_holder();
3337       assert(holder->is_klass(), "just checking");
3338       oop loader = holder->class_loader();
3339       if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3340         return depth;
3341       }
3342       depth++;
3343     }
3344   }
3345   return -1;
3346 JVM_END
3347 
3348 
3349 // java.lang.Package ////////////////////////////////////////////////////////////////
3350 
3351 
3352 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3353   JVMWrapper("JVM_GetSystemPackage");
3354   ResourceMark rm(THREAD);
3355   JvmtiVMObjectAllocEventCollector oam;
3356   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3357   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3358   return (jstring) JNIHandles::make_local(result);
3359 JVM_END
3360 
3361 
3362 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3363   JVMWrapper("JVM_GetSystemPackages");
3364   JvmtiVMObjectAllocEventCollector oam;
3365   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3366   return (jobjectArray) JNIHandles::make_local(result);
3367 JVM_END
3368 
3369 
3370 // ObjectInputStream ///////////////////////////////////////////////////////////////
3371 
3372 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3373   if (current_class == NULL) {
3374     return true;
3375   }
3376   if ((current_class == field_class) || access.is_public()) {
3377     return true;
3378   }
3379 
3380   if (access.is_protected()) {
3381     // See if current_class is a subclass of field_class
3382     if (current_class->is_subclass_of(field_class)) {
3383       return true;
3384     }
3385   }
3386 
3387   return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3388 }
3389 
3390 // Return the first non-null class loader up the execution stack, or null
3391 // if only code from the null class loader is on the stack.
3392 
3393 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3394   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3395     vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3396     oop loader = vfst.method()->method_holder()->class_loader();
3397     if (loader != NULL) {
3398       return JNIHandles::make_local(env, loader);
3399     }
3400   }
3401   return NULL;
3402 JVM_END
3403 
3404 
3405 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3406 
3407 
3408 // resolve array handle and check arguments
3409 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3410   if (arr == NULL) {
3411     THROW_0(vmSymbols::java_lang_NullPointerException());
3412   }
3413   oop a = JNIHandles::resolve_non_null(arr);
3414   if (!a->is_array()) {
3415     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3416   } else if (type_array_only && !a->is_typeArray()) {
3417     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3418   }
3419   return arrayOop(a);
3420 }
3421 
3422 
3423 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3424   JVMWrapper("JVM_GetArrayLength");
3425   arrayOop a = check_array(env, arr, false, CHECK_0);
3426   return a->length();
3427 JVM_END
3428 
3429 
3430 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3431   JVMWrapper("JVM_Array_Get");
3432   JvmtiVMObjectAllocEventCollector oam;
3433   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3434   jvalue value;
3435   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3436   oop box = Reflection::box(&value, type, CHECK_NULL);
3437   return JNIHandles::make_local(env, box);
3438 JVM_END
3439 
3440 
3441 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3442   JVMWrapper("JVM_GetPrimitiveArrayElement");
3443   jvalue value;
3444   value.i = 0; // to initialize value before getting used in CHECK
3445   arrayOop a = check_array(env, arr, true, CHECK_(value));
3446   assert(a->is_typeArray(), "just checking");
3447   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3448   BasicType wide_type = (BasicType) wCode;
3449   if (type != wide_type) {
3450     Reflection::widen(&value, type, wide_type, CHECK_(value));
3451   }
3452   return value;
3453 JVM_END
3454 
3455 
3456 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3457   JVMWrapper("JVM_SetArrayElement");
3458   arrayOop a = check_array(env, arr, false, CHECK);
3459   oop box = JNIHandles::resolve(val);
3460   jvalue value;
3461   value.i = 0; // to initialize value before getting used in CHECK
3462   BasicType value_type;
3463   if (a->is_objArray()) {
3464     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3465     value_type = Reflection::unbox_for_regular_object(box, &value);
3466   } else {
3467     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3468   }
3469   Reflection::array_set(&value, a, index, value_type, CHECK);
3470 JVM_END
3471 
3472 
3473 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3474   JVMWrapper("JVM_SetPrimitiveArrayElement");
3475   arrayOop a = check_array(env, arr, true, CHECK);
3476   assert(a->is_typeArray(), "just checking");
3477   BasicType value_type = (BasicType) vCode;
3478   Reflection::array_set(&v, a, index, value_type, CHECK);
3479 JVM_END
3480 
3481 
3482 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3483   JVMWrapper("JVM_NewArray");
3484   JvmtiVMObjectAllocEventCollector oam;
3485   oop element_mirror = JNIHandles::resolve(eltClass);
3486   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3487   return JNIHandles::make_local(env, result);
3488 JVM_END
3489 
3490 
3491 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3492   JVMWrapper("JVM_NewMultiArray");
3493   JvmtiVMObjectAllocEventCollector oam;
3494   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3495   oop element_mirror = JNIHandles::resolve(eltClass);
3496   assert(dim_array->is_typeArray(), "just checking");
3497   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3498   return JNIHandles::make_local(env, result);
3499 JVM_END
3500 
3501 
3502 // Library support ///////////////////////////////////////////////////////////////////////////
3503 
3504 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3505   //%note jvm_ct
3506   JVMWrapper("JVM_LoadLibrary");
3507   char ebuf[1024];
3508   void *load_result;
3509   {
3510     ThreadToNativeFromVM ttnfvm(thread);
3511     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3512   }
3513   if (load_result == NULL) {
3514     char msg[1024];
3515     jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3516     // Since 'ebuf' may contain a string encoded using
3517     // platform encoding scheme, we need to pass
3518     // Exceptions::unsafe_to_utf8 to the new_exception method
3519     // as the last argument. See bug 6367357.
3520     Handle h_exception =
3521       Exceptions::new_exception(thread,
3522                                 vmSymbols::java_lang_UnsatisfiedLinkError(),
3523                                 msg, Exceptions::unsafe_to_utf8);
3524 
3525     THROW_HANDLE_0(h_exception);
3526   }
3527   return load_result;
3528 JVM_END
3529 
3530 
3531 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3532   JVMWrapper("JVM_UnloadLibrary");
3533   os::dll_unload(handle);
3534 JVM_END
3535 
3536 
3537 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3538   JVMWrapper("JVM_FindLibraryEntry");
3539   return os::dll_lookup(handle, name);
3540 JVM_END
3541 
3542 
3543 // JNI version ///////////////////////////////////////////////////////////////////////////////
3544 
3545 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3546   JVMWrapper("JVM_IsSupportedJNIVersion");
3547   return Threads::is_supported_jni_version_including_1_1(version);
3548 JVM_END
3549 
3550 
3551 // String support ///////////////////////////////////////////////////////////////////////////
3552 
3553 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3554   JVMWrapper("JVM_InternString");
3555   JvmtiVMObjectAllocEventCollector oam;
3556   if (str == NULL) return NULL;
3557   oop string = JNIHandles::resolve_non_null(str);
3558   oop result = StringTable::intern(string, CHECK_NULL);
3559   return (jstring) JNIHandles::make_local(env, result);
3560 JVM_END
3561 
3562 
3563 // Raw monitor support //////////////////////////////////////////////////////////////////////
3564 
3565 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3566 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3567 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3568 // that only works with java threads.
3569 
3570 
3571 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3572   VM_Exit::block_if_vm_exited();
3573   JVMWrapper("JVM_RawMonitorCreate");
3574   return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3575 }
3576 
3577 
3578 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3579   VM_Exit::block_if_vm_exited();
3580   JVMWrapper("JVM_RawMonitorDestroy");
3581   delete ((Mutex*) mon);
3582 }
3583 
3584 
3585 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3586   VM_Exit::block_if_vm_exited();
3587   JVMWrapper("JVM_RawMonitorEnter");
3588   ((Mutex*) mon)->jvm_raw_lock();
3589   return 0;
3590 }
3591 
3592 
3593 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3594   VM_Exit::block_if_vm_exited();
3595   JVMWrapper("JVM_RawMonitorExit");
3596   ((Mutex*) mon)->jvm_raw_unlock();
3597 }
3598 
3599 
3600 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3601 
3602 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3603                                     Handle loader, Handle protection_domain,
3604                                     jboolean throwError, TRAPS) {
3605   // Security Note:
3606   //   The Java level wrapper will perform the necessary security check allowing
3607   //   us to pass the NULL as the initiating class loader.  The VM is responsible for
3608   //   the checkPackageAccess relative to the initiating class loader via the
3609   //   protection_domain. The protection_domain is passed as NULL by the java code
3610   //   if there is no security manager in 3-arg Class.forName().
3611   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3612 
3613   KlassHandle klass_handle(THREAD, klass);
3614   // Check if we should initialize the class
3615   if (init && klass_handle->is_instance_klass()) {
3616     klass_handle->initialize(CHECK_NULL);
3617   }
3618   return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3619 }
3620 
3621 
3622 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3623 
3624 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3625   JVMWrapper("JVM_InvokeMethod");
3626   Handle method_handle;
3627   if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3628     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3629     Handle receiver(THREAD, JNIHandles::resolve(obj));
3630     objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3631     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3632     jobject res = JNIHandles::make_local(env, result);
3633     if (JvmtiExport::should_post_vm_object_alloc()) {
3634       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3635       assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3636       if (java_lang_Class::is_primitive(ret_type)) {
3637         // Only for primitive type vm allocates memory for java object.
3638         // See box() method.
3639         JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3640       }
3641     }
3642     return res;
3643   } else {
3644     THROW_0(vmSymbols::java_lang_StackOverflowError());
3645   }
3646 JVM_END
3647 
3648 
3649 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3650   JVMWrapper("JVM_NewInstanceFromConstructor");
3651   oop constructor_mirror = JNIHandles::resolve(c);
3652   objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3653   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3654   jobject res = JNIHandles::make_local(env, result);
3655   if (JvmtiExport::should_post_vm_object_alloc()) {
3656     JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3657   }
3658   return res;
3659 JVM_END
3660 
3661 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3662 
3663 JVM_LEAF(jboolean, JVM_SupportsCX8())
3664   JVMWrapper("JVM_SupportsCX8");
3665   return VM_Version::supports_cx8();
3666 JVM_END
3667 
3668 // Returns an array of all live Thread objects (VM internal JavaThreads,
3669 // jvmti agent threads, and JNI attaching threads  are skipped)
3670 // See CR 6404306 regarding JNI attaching threads
3671 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3672   ResourceMark rm(THREAD);
3673   ThreadsListEnumerator tle(THREAD, false, false);
3674   JvmtiVMObjectAllocEventCollector oam;
3675 
3676   int num_threads = tle.num_threads();
3677   objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3678   objArrayHandle threads_ah(THREAD, r);
3679 
3680   for (int i = 0; i < num_threads; i++) {
3681     Handle h = tle.get_threadObj(i);
3682     threads_ah->obj_at_put(i, h());
3683   }
3684 
3685   return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3686 JVM_END
3687 
3688 
3689 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3690 // Return StackTraceElement[][], each element is the stack trace of a thread in
3691 // the corresponding entry in the given threads array
3692 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3693   JVMWrapper("JVM_DumpThreads");
3694   JvmtiVMObjectAllocEventCollector oam;
3695 
3696   // Check if threads is null
3697   if (threads == NULL) {
3698     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3699   }
3700 
3701   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3702   objArrayHandle ah(THREAD, a);
3703   int num_threads = ah->length();
3704   // check if threads is non-empty array
3705   if (num_threads == 0) {
3706     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3707   }
3708 
3709   // check if threads is not an array of objects of Thread class
3710   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3711   if (k != SystemDictionary::Thread_klass()) {
3712     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3713   }
3714 
3715   ResourceMark rm(THREAD);
3716 
3717   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3718   for (int i = 0; i < num_threads; i++) {
3719     oop thread_obj = ah->obj_at(i);
3720     instanceHandle h(THREAD, (instanceOop) thread_obj);
3721     thread_handle_array->append(h);
3722   }
3723 
3724   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3725   return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3726 
3727 JVM_END
3728 
3729 // JVM monitoring and management support
3730 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3731   return Management::get_jmm_interface(version);
3732 JVM_END
3733 
3734 // com.sun.tools.attach.VirtualMachine agent properties support
3735 //
3736 // Initialize the agent properties with the properties maintained in the VM
3737 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3738   JVMWrapper("JVM_InitAgentProperties");
3739   ResourceMark rm;
3740 
3741   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3742 
3743   PUTPROP(props, "sun.java.command", Arguments::java_command());
3744   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3745   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3746   return properties;
3747 JVM_END
3748 
3749 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3750 {
3751   JVMWrapper("JVM_GetEnclosingMethodInfo");
3752   JvmtiVMObjectAllocEventCollector oam;
3753 
3754   if (ofClass == NULL) {
3755     return NULL;
3756   }
3757   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3758   // Special handling for primitive objects
3759   if (java_lang_Class::is_primitive(mirror())) {
3760     return NULL;
3761   }
3762   Klass* k = java_lang_Class::as_Klass(mirror());
3763   if (!k->is_instance_klass()) {
3764     return NULL;
3765   }
3766   instanceKlassHandle ik_h(THREAD, k);
3767   int encl_method_class_idx = ik_h->enclosing_method_class_index();
3768   if (encl_method_class_idx == 0) {
3769     return NULL;
3770   }
3771   objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3772   objArrayHandle dest(THREAD, dest_o);
3773   Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3774   dest->obj_at_put(0, enc_k->java_mirror());
3775   int encl_method_method_idx = ik_h->enclosing_method_method_index();
3776   if (encl_method_method_idx != 0) {
3777     Symbol* sym = ik_h->constants()->symbol_at(
3778                         extract_low_short_from_int(
3779                           ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3780     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3781     dest->obj_at_put(1, str());
3782     sym = ik_h->constants()->symbol_at(
3783               extract_high_short_from_int(
3784                 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3785     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3786     dest->obj_at_put(2, str());
3787   }
3788   return (jobjectArray) JNIHandles::make_local(dest());
3789 }
3790 JVM_END
3791 
3792 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3793 {
3794   memset(info, 0, info_size);
3795 
3796   info->jvm_version = Abstract_VM_Version::jvm_version();
3797   info->patch_version = Abstract_VM_Version::vm_patch_version();
3798 
3799   // when we add a new capability in the jvm_version_info struct, we should also
3800   // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3801   // counter defined in runtimeService.cpp.
3802   info->is_attachable = AttachListener::is_attach_supported();
3803 }
3804 JVM_END
3805 
3806 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3807 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3808   ResourceMark rm(THREAD);
3809 
3810   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3811     return NULL;
3812   }
3813 
3814   char** vm_flags = Arguments::jvm_flags_array();
3815   char** vm_args = Arguments::jvm_args_array();
3816   int num_flags = Arguments::num_jvm_flags();
3817   int num_args = Arguments::num_jvm_args();
3818 
3819   instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
3820   objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
3821   objArrayHandle result_h(THREAD, r);
3822 
3823   int index = 0;
3824   for (int j = 0; j < num_flags; j++, index++) {
3825     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3826     result_h->obj_at_put(index, h());
3827   }
3828   for (int i = 0; i < num_args; i++, index++) {
3829     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3830     result_h->obj_at_put(index, h());
3831   }
3832   return (jobjectArray) JNIHandles::make_local(env, result_h());
3833 JVM_END
3834 
3835 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3836   return os::get_signal_number(name);
3837 JVM_END