1 /*
   2  * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_interpreterRuntime.cpp.incl"
  27 
  28 class UnlockFlagSaver {
  29   private:
  30     JavaThread* _thread;
  31     bool _do_not_unlock;
  32   public:
  33     UnlockFlagSaver(JavaThread* t) {
  34       _thread = t;
  35       _do_not_unlock = t->do_not_unlock_if_synchronized();
  36       t->set_do_not_unlock_if_synchronized(false);
  37     }
  38     ~UnlockFlagSaver() {
  39       _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
  40     }
  41 };
  42 
  43 //------------------------------------------------------------------------------------------------------------------------
  44 // State accessors
  45 
  46 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
  47   last_frame(thread).interpreter_frame_set_bcp(bcp);
  48   if (ProfileInterpreter) {
  49     // ProfileTraps uses MDOs independently of ProfileInterpreter.
  50     // That is why we must check both ProfileInterpreter and mdo != NULL.
  51     methodDataOop mdo = last_frame(thread).interpreter_frame_method()->method_data();
  52     if (mdo != NULL) {
  53       NEEDS_CLEANUP;
  54       last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
  55     }
  56   }
  57 }
  58 
  59 //------------------------------------------------------------------------------------------------------------------------
  60 // Constants
  61 
  62 
  63 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
  64   // access constant pool
  65   constantPoolOop pool = method(thread)->constants();
  66   int index = wide ? two_byte_index(thread) : one_byte_index(thread);
  67   constantTag tag = pool->tag_at(index);
  68 
  69   if (tag.is_unresolved_klass() || tag.is_klass()) {
  70     klassOop klass = pool->klass_at(index, CHECK);
  71     oop java_class = klass->klass_part()->java_mirror();
  72     thread->set_vm_result(java_class);
  73   } else {
  74 #ifdef ASSERT
  75     // If we entered this runtime routine, we believed the tag contained
  76     // an unresolved string, an unresolved class or a resolved class.
  77     // However, another thread could have resolved the unresolved string
  78     // or class by the time we go there.
  79     assert(tag.is_unresolved_string()|| tag.is_string(), "expected string");
  80 #endif
  81     oop s_oop = pool->string_at(index, CHECK);
  82     thread->set_vm_result(s_oop);
  83   }
  84 IRT_END
  85 
  86 
  87 //------------------------------------------------------------------------------------------------------------------------
  88 // Allocation
  89 
  90 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, constantPoolOopDesc* pool, int index))
  91   klassOop k_oop = pool->klass_at(index, CHECK);
  92   instanceKlassHandle klass (THREAD, k_oop);
  93 
  94   // Make sure we are not instantiating an abstract klass
  95   klass->check_valid_for_instantiation(true, CHECK);
  96 
  97   // Make sure klass is initialized
  98   klass->initialize(CHECK);
  99 
 100   // At this point the class may not be fully initialized
 101   // because of recursive initialization. If it is fully
 102   // initialized & has_finalized is not set, we rewrite
 103   // it into its fast version (Note: no locking is needed
 104   // here since this is an atomic byte write and can be
 105   // done more than once).
 106   //
 107   // Note: In case of classes with has_finalized we don't
 108   //       rewrite since that saves us an extra check in
 109   //       the fast version which then would call the
 110   //       slow version anyway (and do a call back into
 111   //       Java).
 112   //       If we have a breakpoint, then we don't rewrite
 113   //       because the _breakpoint bytecode would be lost.
 114   oop obj = klass->allocate_instance(CHECK);
 115   thread->set_vm_result(obj);
 116 IRT_END
 117 
 118 
 119 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
 120   oop obj = oopFactory::new_typeArray(type, size, CHECK);
 121   thread->set_vm_result(obj);
 122 IRT_END
 123 
 124 
 125 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, constantPoolOopDesc* pool, int index, jint size))
 126   // Note: no oopHandle for pool & klass needed since they are not used
 127   //       anymore after new_objArray() and no GC can happen before.
 128   //       (This may have to change if this code changes!)
 129   klassOop  klass = pool->klass_at(index, CHECK);
 130   objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
 131   thread->set_vm_result(obj);
 132 IRT_END
 133 
 134 
 135 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
 136   // We may want to pass in more arguments - could make this slightly faster
 137   constantPoolOop constants = method(thread)->constants();
 138   int          i = two_byte_index(thread);
 139   klassOop klass = constants->klass_at(i, CHECK);
 140   int   nof_dims = number_of_dimensions(thread);
 141   assert(oop(klass)->is_klass(), "not a class");
 142   assert(nof_dims >= 1, "multianewarray rank must be nonzero");
 143 
 144   // We must create an array of jints to pass to multi_allocate.
 145   ResourceMark rm(thread);
 146   const int small_dims = 10;
 147   jint dim_array[small_dims];
 148   jint *dims = &dim_array[0];
 149   if (nof_dims > small_dims) {
 150     dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
 151   }
 152   for (int index = 0; index < nof_dims; index++) {
 153     // offset from first_size_address is addressed as local[index]
 154     int n = Interpreter::local_offset_in_bytes(index)/jintSize;
 155     dims[index] = first_size_address[n];
 156   }
 157   oop obj = arrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
 158   thread->set_vm_result(obj);
 159 IRT_END
 160 
 161 
 162 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
 163   assert(obj->is_oop(), "must be a valid oop");
 164   assert(obj->klass()->klass_part()->has_finalizer(), "shouldn't be here otherwise");
 165   instanceKlass::register_finalizer(instanceOop(obj), CHECK);
 166 IRT_END
 167 
 168 
 169 // Quicken instance-of and check-cast bytecodes
 170 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
 171   // Force resolving; quicken the bytecode
 172   int which = two_byte_index(thread);
 173   constantPoolOop cpool = method(thread)->constants();
 174   // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
 175   // program we might have seen an unquick'd bytecode in the interpreter but have another
 176   // thread quicken the bytecode before we get here.
 177   // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
 178   klassOop klass = cpool->klass_at(which, CHECK);
 179   thread->set_vm_result(klass);
 180 IRT_END
 181 
 182 
 183 //------------------------------------------------------------------------------------------------------------------------
 184 // Exceptions
 185 
 186 // Assume the compiler is (or will be) interested in this event.
 187 // If necessary, create an MDO to hold the information, and record it.
 188 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
 189   assert(ProfileTraps, "call me only if profiling");
 190   methodHandle trap_method(thread, method(thread));
 191   if (trap_method.not_null()) {
 192     methodDataHandle trap_mdo(thread, trap_method->method_data());
 193     if (trap_mdo.is_null()) {
 194       methodOopDesc::build_interpreter_method_data(trap_method, THREAD);
 195       if (HAS_PENDING_EXCEPTION) {
 196         assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 197         CLEAR_PENDING_EXCEPTION;
 198       }
 199       trap_mdo = methodDataHandle(thread, trap_method->method_data());
 200       // and fall through...
 201     }
 202     if (trap_mdo.not_null()) {
 203       // Update per-method count of trap events.  The interpreter
 204       // is updating the MDO to simulate the effect of compiler traps.
 205       int trap_bci = trap_method->bci_from(bcp(thread));
 206       Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
 207     }
 208   }
 209 }
 210 
 211 static Handle get_preinitialized_exception(klassOop k, TRAPS) {
 212   // get klass
 213   instanceKlass* klass = instanceKlass::cast(k);
 214   assert(klass->is_initialized(),
 215          "this klass should have been initialized during VM initialization");
 216   // create instance - do not call constructor since we may have no
 217   // (java) stack space left (should assert constructor is empty)
 218   Handle exception;
 219   oop exception_oop = klass->allocate_instance(CHECK_(exception));
 220   exception = Handle(THREAD, exception_oop);
 221   if (StackTraceInThrowable) {
 222     java_lang_Throwable::fill_in_stack_trace(exception);
 223   }
 224   return exception;
 225 }
 226 
 227 // Special handling for stack overflow: since we don't have any (java) stack
 228 // space left we use the pre-allocated & pre-initialized StackOverflowError
 229 // klass to create an stack overflow error instance.  We do not call its
 230 // constructor for the same reason (it is empty, anyway).
 231 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
 232   Handle exception = get_preinitialized_exception(
 233                                  SystemDictionary::StackOverflowError_klass(),
 234                                  CHECK);
 235   THROW_HANDLE(exception);
 236 IRT_END
 237 
 238 
 239 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
 240   // lookup exception klass
 241   symbolHandle s = oopFactory::new_symbol_handle(name, CHECK);
 242   if (ProfileTraps) {
 243     if (s == vmSymbols::java_lang_ArithmeticException()) {
 244       note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
 245     } else if (s == vmSymbols::java_lang_NullPointerException()) {
 246       note_trap(thread, Deoptimization::Reason_null_check, CHECK);
 247     }
 248   }
 249   // create exception
 250   Handle exception = Exceptions::new_exception(thread, s(), message);
 251   thread->set_vm_result(exception());
 252 IRT_END
 253 
 254 
 255 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
 256   ResourceMark rm(thread);
 257   const char* klass_name = Klass::cast(obj->klass())->external_name();
 258   // lookup exception klass
 259   symbolHandle s = oopFactory::new_symbol_handle(name, CHECK);
 260   if (ProfileTraps) {
 261     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 262   }
 263   // create exception, with klass name as detail message
 264   Handle exception = Exceptions::new_exception(thread, s(), klass_name);
 265   thread->set_vm_result(exception());
 266 IRT_END
 267 
 268 
 269 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
 270   char message[jintAsStringSize];
 271   // lookup exception klass
 272   symbolHandle s = oopFactory::new_symbol_handle(name, CHECK);
 273   if (ProfileTraps) {
 274     note_trap(thread, Deoptimization::Reason_range_check, CHECK);
 275   }
 276   // create exception
 277   sprintf(message, "%d", index);
 278   THROW_MSG(s(), message);
 279 IRT_END
 280 
 281 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
 282   JavaThread* thread, oopDesc* obj))
 283 
 284   ResourceMark rm(thread);
 285   char* message = SharedRuntime::generate_class_cast_message(
 286     thread, Klass::cast(obj->klass())->external_name());
 287 
 288   if (ProfileTraps) {
 289     note_trap(thread, Deoptimization::Reason_class_check, CHECK);
 290   }
 291 
 292   // create exception
 293   THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
 294 IRT_END
 295 
 296 // required can be either a MethodType, or a Class (for a single argument)
 297 // actual (if not null) can be either a MethodHandle, or an arbitrary value (for a single argument)
 298 IRT_ENTRY(void, InterpreterRuntime::throw_WrongMethodTypeException(JavaThread* thread,
 299                                                                    oopDesc* required,
 300                                                                    oopDesc* actual)) {
 301   ResourceMark rm(thread);
 302   char* message = SharedRuntime::generate_wrong_method_type_message(thread, required, actual);
 303 
 304   if (ProfileTraps) {
 305     note_trap(thread, Deoptimization::Reason_constraint, CHECK);
 306   }
 307 
 308   // create exception
 309   THROW_MSG(vmSymbols::java_dyn_WrongMethodTypeException(), message);
 310 }
 311 IRT_END
 312 
 313 
 314 
 315 // exception_handler_for_exception(...) returns the continuation address,
 316 // the exception oop (via TLS) and sets the bci/bcp for the continuation.
 317 // The exception oop is returned to make sure it is preserved over GC (it
 318 // is only on the stack if the exception was thrown explicitly via athrow).
 319 // During this operation, the expression stack contains the values for the
 320 // bci where the exception happened. If the exception was propagated back
 321 // from a call, the expression stack contains the values for the bci at the
 322 // invoke w/o arguments (i.e., as if one were inside the call).
 323 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
 324 
 325   Handle             h_exception(thread, exception);
 326   methodHandle       h_method   (thread, method(thread));
 327   constantPoolHandle h_constants(thread, h_method->constants());
 328   typeArrayHandle    h_extable  (thread, h_method->exception_table());
 329   bool               should_repeat;
 330   int                handler_bci;
 331   int                current_bci = bcp(thread) - h_method->code_base();
 332 
 333   // Need to do this check first since when _do_not_unlock_if_synchronized
 334   // is set, we don't want to trigger any classloading which may make calls
 335   // into java, or surprisingly find a matching exception handler for bci 0
 336   // since at this moment the method hasn't been "officially" entered yet.
 337   if (thread->do_not_unlock_if_synchronized()) {
 338     ResourceMark rm;
 339     assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");
 340     thread->set_vm_result(exception);
 341 #ifdef CC_INTERP
 342     return (address) -1;
 343 #else
 344     return Interpreter::remove_activation_entry();
 345 #endif
 346   }
 347 
 348   do {
 349     should_repeat = false;
 350 
 351     // assertions
 352 #ifdef ASSERT
 353     assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
 354     assert(h_exception->is_oop(), "just checking");
 355     // Check that exception is a subclass of Throwable, otherwise we have a VerifyError
 356     if (!(h_exception->is_a(SystemDictionary::throwable_klass()))) {
 357       if (ExitVMOnVerifyError) vm_exit(-1);
 358       ShouldNotReachHere();
 359     }
 360 #endif
 361 
 362     // tracing
 363     if (TraceExceptions) {
 364       ttyLocker ttyl;
 365       ResourceMark rm(thread);
 366       tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception());
 367       tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
 368       tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
 369     }
 370 // Don't go paging in something which won't be used.
 371 //     else if (h_extable->length() == 0) {
 372 //       // disabled for now - interpreter is not using shortcut yet
 373 //       // (shortcut is not to call runtime if we have no exception handlers)
 374 //       // warning("performance bug: should not call runtime if method has no exception handlers");
 375 //     }
 376     // for AbortVMOnException flag
 377     NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
 378 
 379     // exception handler lookup
 380     KlassHandle h_klass(THREAD, h_exception->klass());
 381     handler_bci = h_method->fast_exception_handler_bci_for(h_klass, current_bci, THREAD);
 382     if (HAS_PENDING_EXCEPTION) {
 383       // We threw an exception while trying to find the exception handler.
 384       // Transfer the new exception to the exception handle which will
 385       // be set into thread local storage, and do another lookup for an
 386       // exception handler for this exception, this time starting at the
 387       // BCI of the exception handler which caused the exception to be
 388       // thrown (bug 4307310).
 389       h_exception = Handle(THREAD, PENDING_EXCEPTION);
 390       CLEAR_PENDING_EXCEPTION;
 391       if (handler_bci >= 0) {
 392         current_bci = handler_bci;
 393         should_repeat = true;
 394       }
 395     }
 396   } while (should_repeat == true);
 397 
 398   // notify JVMTI of an exception throw; JVMTI will detect if this is a first
 399   // time throw or a stack unwinding throw and accordingly notify the debugger
 400   if (JvmtiExport::can_post_exceptions()) {
 401     JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
 402   }
 403 
 404 #ifdef CC_INTERP
 405   address continuation = (address)(intptr_t) handler_bci;
 406 #else
 407   address continuation = NULL;
 408 #endif
 409   address handler_pc = NULL;
 410   if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
 411     // Forward exception to callee (leaving bci/bcp untouched) because (a) no
 412     // handler in this method, or (b) after a stack overflow there is not yet
 413     // enough stack space available to reprotect the stack.
 414 #ifndef CC_INTERP
 415     continuation = Interpreter::remove_activation_entry();
 416 #endif
 417     // Count this for compilation purposes
 418     h_method->interpreter_throwout_increment();
 419   } else {
 420     // handler in this method => change bci/bcp to handler bci/bcp and continue there
 421     handler_pc = h_method->code_base() + handler_bci;
 422 #ifndef CC_INTERP
 423     set_bcp_and_mdp(handler_pc, thread);
 424     continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
 425 #endif
 426   }
 427   // notify debugger of an exception catch
 428   // (this is good for exceptions caught in native methods as well)
 429   if (JvmtiExport::can_post_exceptions()) {
 430     JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
 431   }
 432 
 433   thread->set_vm_result(h_exception());
 434   return continuation;
 435 IRT_END
 436 
 437 
 438 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
 439   assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
 440   // nothing to do - eventually we should remove this code entirely (see comments @ call sites)
 441 IRT_END
 442 
 443 
 444 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
 445   THROW(vmSymbols::java_lang_AbstractMethodError());
 446 IRT_END
 447 
 448 
 449 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
 450   THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
 451 IRT_END
 452 
 453 
 454 //------------------------------------------------------------------------------------------------------------------------
 455 // Fields
 456 //
 457 
 458 IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
 459   // resolve field
 460   FieldAccessInfo info;
 461   constantPoolHandle pool(thread, method(thread)->constants());
 462   bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
 463 
 464   {
 465     JvmtiHideSingleStepping jhss(thread);
 466     LinkResolver::resolve_field(info, pool, two_byte_index(thread),
 467                                 bytecode, false, CHECK);
 468   } // end JvmtiHideSingleStepping
 469 
 470   // check if link resolution caused cpCache to be updated
 471   if (already_resolved(thread)) return;
 472 
 473   // compute auxiliary field attributes
 474   TosState state  = as_TosState(info.field_type());
 475 
 476   // We need to delay resolving put instructions on final fields
 477   // until we actually invoke one. This is required so we throw
 478   // exceptions at the correct place. If we do not resolve completely
 479   // in the current pass, leaving the put_code set to zero will
 480   // cause the next put instruction to reresolve.
 481   bool is_put = (bytecode == Bytecodes::_putfield ||
 482                  bytecode == Bytecodes::_putstatic);
 483   Bytecodes::Code put_code = (Bytecodes::Code)0;
 484 
 485   // We also need to delay resolving getstatic instructions until the
 486   // class is intitialized.  This is required so that access to the static
 487   // field will call the initialization function every time until the class
 488   // is completely initialized ala. in 2.17.5 in JVM Specification.
 489   instanceKlass *klass = instanceKlass::cast(info.klass()->as_klassOop());
 490   bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
 491                                !klass->is_initialized());
 492   Bytecodes::Code get_code = (Bytecodes::Code)0;
 493 
 494 
 495   if (!uninitialized_static) {
 496     get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
 497     if (is_put || !info.access_flags().is_final()) {
 498       put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
 499     }
 500   }
 501 
 502   cache_entry(thread)->set_field(
 503     get_code,
 504     put_code,
 505     info.klass(),
 506     info.field_index(),
 507     info.field_offset(),
 508     state,
 509     info.access_flags().is_final(),
 510     info.access_flags().is_volatile()
 511   );
 512 IRT_END
 513 
 514 
 515 //------------------------------------------------------------------------------------------------------------------------
 516 // Synchronization
 517 //
 518 // The interpreter's synchronization code is factored out so that it can
 519 // be shared by method invocation and synchronized blocks.
 520 //%note synchronization_3
 521 
 522 static void trace_locking(Handle& h_locking_obj, bool is_locking) {
 523   ObjectSynchronizer::trace_locking(h_locking_obj, false, true, is_locking);
 524 }
 525 
 526 
 527 //%note monitor_1
 528 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
 529 #ifdef ASSERT
 530   thread->last_frame().interpreter_frame_verify_monitor(elem);
 531 #endif
 532   if (PrintBiasedLockingStatistics) {
 533     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
 534   }
 535   Handle h_obj(thread, elem->obj());
 536   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 537          "must be NULL or an object");
 538   if (UseBiasedLocking) {
 539     // Retry fast entry if bias is revoked to avoid unnecessary inflation
 540     ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
 541   } else {
 542     ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
 543   }
 544   assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
 545          "must be NULL or an object");
 546 #ifdef ASSERT
 547   thread->last_frame().interpreter_frame_verify_monitor(elem);
 548 #endif
 549 IRT_END
 550 
 551 
 552 //%note monitor_1
 553 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
 554 #ifdef ASSERT
 555   thread->last_frame().interpreter_frame_verify_monitor(elem);
 556 #endif
 557   Handle h_obj(thread, elem->obj());
 558   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
 559          "must be NULL or an object");
 560   if (elem == NULL || h_obj()->is_unlocked()) {
 561     THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 562   }
 563   ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
 564   // Free entry. This must be done here, since a pending exception might be installed on
 565   // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
 566   elem->set_obj(NULL);
 567 #ifdef ASSERT
 568   thread->last_frame().interpreter_frame_verify_monitor(elem);
 569 #endif
 570 IRT_END
 571 
 572 
 573 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
 574   THROW(vmSymbols::java_lang_IllegalMonitorStateException());
 575 IRT_END
 576 
 577 
 578 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
 579   // Returns an illegal exception to install into the current thread. The
 580   // pending_exception flag is cleared so normal exception handling does not
 581   // trigger. Any current installed exception will be overwritten. This
 582   // method will be called during an exception unwind.
 583 
 584   assert(!HAS_PENDING_EXCEPTION, "no pending exception");
 585   Handle exception(thread, thread->vm_result());
 586   assert(exception() != NULL, "vm result should be set");
 587   thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
 588   if (!exception->is_a(SystemDictionary::threaddeath_klass())) {
 589     exception = get_preinitialized_exception(
 590                        SystemDictionary::IllegalMonitorStateException_klass(),
 591                        CATCH);
 592   }
 593   thread->set_vm_result(exception());
 594 IRT_END
 595 
 596 
 597 //------------------------------------------------------------------------------------------------------------------------
 598 // Invokes
 599 
 600 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp))
 601   return method->orig_bytecode_at(method->bci_from(bcp));
 602 IRT_END
 603 
 604 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, methodOopDesc* method, address bcp, Bytecodes::Code new_code))
 605   method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
 606 IRT_END
 607 
 608 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, methodOopDesc* method, address bcp))
 609   JvmtiExport::post_raw_breakpoint(thread, method, bcp);
 610 IRT_END
 611 
 612 IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode))
 613   // extract receiver from the outgoing argument list if necessary
 614   Handle receiver(thread, NULL);
 615   if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {
 616     ResourceMark rm(thread);
 617     methodHandle m (thread, method(thread));
 618     int bci = m->bci_from(bcp(thread));
 619     Bytecode_invoke* call = Bytecode_invoke_at(m, bci);
 620     symbolHandle signature (thread, call->signature());
 621     receiver = Handle(thread,
 622                   thread->last_frame().interpreter_callee_receiver(signature));
 623     assert(Universe::heap()->is_in_reserved_or_null(receiver()),
 624            "sanity check");
 625     assert(receiver.is_null() ||
 626            Universe::heap()->is_in_reserved(receiver->klass()),
 627            "sanity check");
 628   }
 629 
 630   // resolve method
 631   CallInfo info;
 632   constantPoolHandle pool(thread, method(thread)->constants());
 633 
 634   {
 635     JvmtiHideSingleStepping jhss(thread);
 636     LinkResolver::resolve_invoke(info, receiver, pool,
 637                                  two_byte_index(thread), bytecode, CHECK);
 638     if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
 639       int retry_count = 0;
 640       while (info.resolved_method()->is_old()) {
 641         // It is very unlikely that method is redefined more than 100 times
 642         // in the middle of resolve. If it is looping here more than 100 times
 643         // means then there could be a bug here.
 644         guarantee((retry_count++ < 100),
 645                   "Could not resolve to latest version of redefined method");
 646         // method is redefined in the middle of resolve so re-try.
 647         LinkResolver::resolve_invoke(info, receiver, pool,
 648                                      two_byte_index(thread), bytecode, CHECK);
 649       }
 650     }
 651   } // end JvmtiHideSingleStepping
 652 
 653   // check if link resolution caused cpCache to be updated
 654   if (already_resolved(thread)) return;
 655 
 656   if (bytecode == Bytecodes::_invokeinterface) {
 657 
 658     if (TraceItables && Verbose) {
 659       ResourceMark rm(thread);
 660       tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
 661     }
 662     if (info.resolved_method()->method_holder() ==
 663                                             SystemDictionary::object_klass()) {
 664       // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
 665       // (see also cpCacheOop.cpp for details)
 666       methodHandle rm = info.resolved_method();
 667       assert(rm->is_final() || info.has_vtable_index(),
 668              "should have been set already");
 669       cache_entry(thread)->set_method(bytecode, rm, info.vtable_index());
 670     } else {
 671       // Setup itable entry
 672       int index = klassItable::compute_itable_index(info.resolved_method()());
 673       cache_entry(thread)->set_interface_call(info.resolved_method(), index);
 674     }
 675   } else {
 676     cache_entry(thread)->set_method(
 677       bytecode,
 678       info.resolved_method(),
 679       info.vtable_index());
 680   }
 681 IRT_END
 682 
 683 
 684 // First time execution:  Resolve symbols, create a permanent CallSite object.
 685 IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
 686   ResourceMark rm(thread);
 687 
 688   assert(EnableInvokeDynamic, "");
 689 
 690   const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
 691 
 692   methodHandle caller_method(thread, method(thread));
 693 
 694   // first determine if there is a bootstrap method
 695   {
 696     KlassHandle caller_klass(thread, caller_method->method_holder());
 697     Handle bootm = SystemDictionary::find_bootstrap_method(caller_klass, KlassHandle(), CHECK);
 698     if (bootm.is_null()) {
 699       // If there is no bootstrap method, throw IncompatibleClassChangeError.
 700       // This is a valid generic error type for resolution (JLS 12.3.3).
 701       char buf[200];
 702       jio_snprintf(buf, sizeof(buf), "Class %s has not declared a bootstrap method for invokedynamic",
 703                    (Klass::cast(caller_klass()))->external_name());
 704       THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
 705     }
 706   }
 707 
 708   constantPoolHandle pool(thread, caller_method->constants());
 709   pool->set_invokedynamic();    // mark header to flag active call sites
 710 
 711   int site_index = four_byte_index(thread);
 712   // there is a second CPC entries that is of interest; it caches signature info:
 713   int main_index = pool->cache()->secondary_entry_at(site_index)->main_entry_index();
 714 
 715   // first resolve the signature to a MH.invoke methodOop
 716   if (!pool->cache()->entry_at(main_index)->is_resolved(bytecode)) {
 717     JvmtiHideSingleStepping jhss(thread);
 718     CallInfo info;
 719     LinkResolver::resolve_invoke(info, Handle(), pool,
 720                                  site_index, bytecode, CHECK);
 721     // The main entry corresponds to a JVM_CONSTANT_NameAndType, and serves
 722     // as a common reference point for all invokedynamic call sites with
 723     // that exact call descriptor.  We will link it in the CP cache exactly
 724     // as if it were an invokevirtual of MethodHandle.invoke.
 725     pool->cache()->entry_at(main_index)->set_method(
 726       bytecode,
 727       info.resolved_method(),
 728       info.vtable_index());
 729     assert(pool->cache()->entry_at(main_index)->is_vfinal(), "f2 must be a methodOop");
 730   }
 731 
 732   // The method (f2 entry) of the main entry is the MH.invoke for the
 733   // invokedynamic target call signature.
 734   intptr_t f2_value = pool->cache()->entry_at(main_index)->f2();
 735   methodHandle mh_invdyn(THREAD, (methodOop) f2_value);
 736   assert(mh_invdyn.not_null() && mh_invdyn->is_method() && mh_invdyn->is_method_handle_invoke(),
 737          "correct result from LinkResolver::resolve_invokedynamic");
 738 
 739   symbolHandle call_site_name(THREAD, pool->name_ref_at(site_index));
 740   Handle call_site
 741     = SystemDictionary::make_dynamic_call_site(caller_method->method_holder(),
 742                                                caller_method->method_idnum(),
 743                                                caller_method->bci_from(bcp(thread)),
 744                                                call_site_name,
 745                                                mh_invdyn,
 746                                                CHECK);
 747 
 748   // In the secondary entry, the f1 field is the call site, and the f2 (index)
 749   // field is some data about the invoke site.
 750   int extra_data = 0;
 751   pool->cache()->secondary_entry_at(site_index)->set_dynamic_call(call_site(), extra_data);
 752 }
 753 IRT_END
 754 
 755 
 756 //------------------------------------------------------------------------------------------------------------------------
 757 // Miscellaneous
 758 
 759 
 760 #ifndef PRODUCT
 761 static void trace_frequency_counter_overflow(methodHandle m, int branch_bci, int bci, address branch_bcp) {
 762   if (TraceInvocationCounterOverflow) {
 763     InvocationCounter* ic = m->invocation_counter();
 764     InvocationCounter* bc = m->backedge_counter();
 765     ResourceMark rm;
 766     const char* msg =
 767       branch_bcp == NULL
 768       ? "comp-policy cntr ovfl @ %d in entry of "
 769       : "comp-policy cntr ovfl @ %d in loop of ";
 770     tty->print(msg, bci);
 771     m->print_value();
 772     tty->cr();
 773     ic->print();
 774     bc->print();
 775     if (ProfileInterpreter) {
 776       if (branch_bcp != NULL) {
 777         methodDataOop mdo = m->method_data();
 778         if (mdo != NULL) {
 779           int count = mdo->bci_to_data(branch_bci)->as_JumpData()->taken();
 780           tty->print_cr("back branch count = %d", count);
 781         }
 782       }
 783     }
 784   }
 785 }
 786 
 787 static void trace_osr_request(methodHandle method, nmethod* osr, int bci) {
 788   if (TraceOnStackReplacement) {
 789     ResourceMark rm;
 790     tty->print(osr != NULL ? "Reused OSR entry for " : "Requesting OSR entry for ");
 791     method->print_short_name(tty);
 792     tty->print_cr(" at bci %d", bci);
 793   }
 794 }
 795 #endif // !PRODUCT
 796 
 797 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
 798   nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
 799   assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
 800   if (branch_bcp != NULL && nm != NULL) {
 801     // This was a successful request for an OSR nmethod.  Because
 802     // frequency_counter_overflow_inner ends with a safepoint check,
 803     // nm could have been unloaded so look it up again.  It's unsafe
 804     // to examine nm directly since it might have been freed and used
 805     // for something else.
 806     frame fr = thread->last_frame();
 807     methodOop method =  fr.interpreter_frame_method();
 808     int bci = method->bci_from(fr.interpreter_frame_bcp());
 809     nm = method->lookup_osr_nmethod_for(bci);
 810   }
 811   return nm;
 812 }
 813 
 814 IRT_ENTRY(nmethod*,
 815           InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
 816   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 817   // flag, in case this method triggers classloading which will call into Java.
 818   UnlockFlagSaver fs(thread);
 819 
 820   frame fr = thread->last_frame();
 821   assert(fr.is_interpreted_frame(), "must come from interpreter");
 822   methodHandle method(thread, fr.interpreter_frame_method());
 823   const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : 0;
 824   const int bci = method->bci_from(fr.interpreter_frame_bcp());
 825   NOT_PRODUCT(trace_frequency_counter_overflow(method, branch_bci, bci, branch_bcp);)
 826 
 827   if (JvmtiExport::can_post_interpreter_events()) {
 828     if (thread->is_interp_only_mode()) {
 829       // If certain JVMTI events (e.g. frame pop event) are requested then the
 830       // thread is forced to remain in interpreted code. This is
 831       // implemented partly by a check in the run_compiled_code
 832       // section of the interpreter whether we should skip running
 833       // compiled code, and partly by skipping OSR compiles for
 834       // interpreted-only threads.
 835       if (branch_bcp != NULL) {
 836         CompilationPolicy::policy()->reset_counter_for_back_branch_event(method);
 837         return NULL;
 838       }
 839     }
 840   }
 841 
 842   if (branch_bcp == NULL) {
 843     // when code cache is full, compilation gets switched off, UseCompiler
 844     // is set to false
 845     if (!method->has_compiled_code() && UseCompiler) {
 846       CompilationPolicy::policy()->method_invocation_event(method, CHECK_NULL);
 847     } else {
 848       // Force counter overflow on method entry, even if no compilation
 849       // happened.  (The method_invocation_event call does this also.)
 850       CompilationPolicy::policy()->reset_counter_for_invocation_event(method);
 851     }
 852     // compilation at an invocation overflow no longer goes and retries test for
 853     // compiled method. We always run the loser of the race as interpreted.
 854     // so return NULL
 855     return NULL;
 856   } else {
 857     // counter overflow in a loop => try to do on-stack-replacement
 858     nmethod* osr_nm = method->lookup_osr_nmethod_for(bci);
 859     NOT_PRODUCT(trace_osr_request(method, osr_nm, bci);)
 860     // when code cache is full, we should not compile any more...
 861     if (osr_nm == NULL && UseCompiler) {
 862       const int branch_bci = method->bci_from(branch_bcp);
 863       CompilationPolicy::policy()->method_back_branch_event(method, branch_bci, bci, CHECK_NULL);
 864       osr_nm = method->lookup_osr_nmethod_for(bci);
 865     }
 866     if (osr_nm == NULL) {
 867       CompilationPolicy::policy()->reset_counter_for_back_branch_event(method);
 868       return NULL;
 869     } else {
 870       // We may need to do on-stack replacement which requires that no
 871       // monitors in the activation are biased because their
 872       // BasicObjectLocks will need to migrate during OSR. Force
 873       // unbiasing of all monitors in the activation now (even though
 874       // the OSR nmethod might be invalidated) because we don't have a
 875       // safepoint opportunity later once the migration begins.
 876       if (UseBiasedLocking) {
 877         ResourceMark rm;
 878         GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();
 879         for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
 880              kptr < fr.interpreter_frame_monitor_begin();
 881              kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
 882           if( kptr->obj() != NULL ) {
 883             objects_to_revoke->append(Handle(THREAD, kptr->obj()));
 884           }
 885         }
 886         BiasedLocking::revoke(objects_to_revoke);
 887       }
 888       return osr_nm;
 889     }
 890   }
 891 IRT_END
 892 
 893 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(methodOopDesc* method, address cur_bcp))
 894   assert(ProfileInterpreter, "must be profiling interpreter");
 895   int bci = method->bci_from(cur_bcp);
 896   methodDataOop mdo = method->method_data();
 897   if (mdo == NULL)  return 0;
 898   return mdo->bci_to_di(bci);
 899 IRT_END
 900 
 901 IRT_ENTRY(jint, InterpreterRuntime::profile_method(JavaThread* thread, address cur_bcp))
 902   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
 903   // flag, in case this method triggers classloading which will call into Java.
 904   UnlockFlagSaver fs(thread);
 905 
 906   assert(ProfileInterpreter, "must be profiling interpreter");
 907   frame fr = thread->last_frame();
 908   assert(fr.is_interpreted_frame(), "must come from interpreter");
 909   methodHandle method(thread, fr.interpreter_frame_method());
 910   int bci = method->bci_from(cur_bcp);
 911   methodOopDesc::build_interpreter_method_data(method, THREAD);
 912   if (HAS_PENDING_EXCEPTION) {
 913     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
 914     CLEAR_PENDING_EXCEPTION;
 915     // and fall through...
 916   }
 917   methodDataOop mdo = method->method_data();
 918   if (mdo == NULL)  return 0;
 919   return mdo->bci_to_di(bci);
 920 IRT_END
 921 
 922 
 923 #ifdef ASSERT
 924 IRT_LEAF(void, InterpreterRuntime::verify_mdp(methodOopDesc* method, address bcp, address mdp))
 925   assert(ProfileInterpreter, "must be profiling interpreter");
 926 
 927   methodDataOop mdo = method->method_data();
 928   assert(mdo != NULL, "must not be null");
 929 
 930   int bci = method->bci_from(bcp);
 931 
 932   address mdp2 = mdo->bci_to_dp(bci);
 933   if (mdp != mdp2) {
 934     ResourceMark rm;
 935     ResetNoHandleMark rnm; // In a LEAF entry.
 936     HandleMark hm;
 937     tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);
 938     int current_di = mdo->dp_to_di(mdp);
 939     int expected_di  = mdo->dp_to_di(mdp2);
 940     tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);
 941     int expected_approx_bci = mdo->data_at(expected_di)->bci();
 942     int approx_bci = -1;
 943     if (current_di >= 0) {
 944       approx_bci = mdo->data_at(current_di)->bci();
 945     }
 946     tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);
 947     mdo->print_on(tty);
 948     method->print_codes();
 949   }
 950   assert(mdp == mdp2, "wrong mdp");
 951 IRT_END
 952 #endif // ASSERT
 953 
 954 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))
 955   assert(ProfileInterpreter, "must be profiling interpreter");
 956   ResourceMark rm(thread);
 957   HandleMark hm(thread);
 958   frame fr = thread->last_frame();
 959   assert(fr.is_interpreted_frame(), "must come from interpreter");
 960   methodDataHandle h_mdo(thread, fr.interpreter_frame_method()->method_data());
 961 
 962   // Grab a lock to ensure atomic access to setting the return bci and
 963   // the displacement.  This can block and GC, invalidating all naked oops.
 964   MutexLocker ml(RetData_lock);
 965 
 966   // ProfileData is essentially a wrapper around a derived oop, so we
 967   // need to take the lock before making any ProfileData structures.
 968   ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));
 969   RetData* rdata = data->as_RetData();
 970   address new_mdp = rdata->fixup_ret(return_bci, h_mdo);
 971   fr.interpreter_frame_set_mdp(new_mdp);
 972 IRT_END
 973 
 974 
 975 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))
 976   // We used to need an explict preserve_arguments here for invoke bytecodes. However,
 977   // stack traversal automatically takes care of preserving arguments for invoke, so
 978   // this is no longer needed.
 979 
 980   // IRT_END does an implicit safepoint check, hence we are guaranteed to block
 981   // if this is called during a safepoint
 982 
 983   if (JvmtiExport::should_post_single_step()) {
 984     // We are called during regular safepoints and when the VM is
 985     // single stepping. If any thread is marked for single stepping,
 986     // then we may have JVMTI work to do.
 987     JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));
 988   }
 989 IRT_END
 990 
 991 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,
 992 ConstantPoolCacheEntry *cp_entry))
 993 
 994   // check the access_flags for the field in the klass
 995   instanceKlass* ik = instanceKlass::cast((klassOop)cp_entry->f1());
 996   typeArrayOop fields = ik->fields();
 997   int index = cp_entry->field_index();
 998   assert(index < fields->length(), "holders field index is out of range");
 999   // bail out if field accesses are not watched
1000   if ((fields->ushort_at(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;
1001 
1002   switch(cp_entry->flag_state()) {
1003     case btos:    // fall through
1004     case ctos:    // fall through
1005     case stos:    // fall through
1006     case itos:    // fall through
1007     case ftos:    // fall through
1008     case ltos:    // fall through
1009     case dtos:    // fall through
1010     case atos: break;
1011     default: ShouldNotReachHere(); return;
1012   }
1013   bool is_static = (obj == NULL);
1014   HandleMark hm(thread);
1015 
1016   Handle h_obj;
1017   if (!is_static) {
1018     // non-static field accessors have an object, but we need a handle
1019     h_obj = Handle(thread, obj);
1020   }
1021   instanceKlassHandle h_cp_entry_f1(thread, (klassOop)cp_entry->f1());
1022   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_cp_entry_f1, cp_entry->f2(), is_static);
1023   JvmtiExport::post_field_access(thread, method(thread), bcp(thread), h_cp_entry_f1, h_obj, fid);
1024 IRT_END
1025 
1026 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,
1027   oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))
1028 
1029   klassOop k = (klassOop)cp_entry->f1();
1030 
1031   // check the access_flags for the field in the klass
1032   instanceKlass* ik = instanceKlass::cast(k);
1033   typeArrayOop fields = ik->fields();
1034   int index = cp_entry->field_index();
1035   assert(index < fields->length(), "holders field index is out of range");
1036   // bail out if field modifications are not watched
1037   if ((fields->ushort_at(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;
1038 
1039   char sig_type = '\0';
1040 
1041   switch(cp_entry->flag_state()) {
1042     case btos: sig_type = 'Z'; break;
1043     case ctos: sig_type = 'C'; break;
1044     case stos: sig_type = 'S'; break;
1045     case itos: sig_type = 'I'; break;
1046     case ftos: sig_type = 'F'; break;
1047     case atos: sig_type = 'L'; break;
1048     case ltos: sig_type = 'J'; break;
1049     case dtos: sig_type = 'D'; break;
1050     default:  ShouldNotReachHere(); return;
1051   }
1052   bool is_static = (obj == NULL);
1053 
1054   HandleMark hm(thread);
1055   instanceKlassHandle h_klass(thread, k);
1056   jfieldID fid = jfieldIDWorkaround::to_jfieldID(h_klass, cp_entry->f2(), is_static);
1057   jvalue fvalue;
1058 #ifdef _LP64
1059   fvalue = *value;
1060 #else
1061   // Long/double values are stored unaligned and also noncontiguously with
1062   // tagged stacks.  We can't just do a simple assignment even in the non-
1063   // J/D cases because a C++ compiler is allowed to assume that a jvalue is
1064   // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.
1065   // We assume that the two halves of longs/doubles are stored in interpreter
1066   // stack slots in platform-endian order.
1067   jlong_accessor u;
1068   jint* newval = (jint*)value;
1069   u.words[0] = newval[0];
1070   u.words[1] = newval[Interpreter::stackElementWords()]; // skip if tag
1071   fvalue.j = u.long_value;
1072 #endif // _LP64
1073 
1074   Handle h_obj;
1075   if (!is_static) {
1076     // non-static field accessors have an object, but we need a handle
1077     h_obj = Handle(thread, obj);
1078   }
1079 
1080   JvmtiExport::post_raw_field_modification(thread, method(thread), bcp(thread), h_klass, h_obj,
1081                                            fid, sig_type, &fvalue);
1082 IRT_END
1083 
1084 IRT_ENTRY(void, InterpreterRuntime::post_method_entry(JavaThread *thread))
1085   JvmtiExport::post_method_entry(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1086 IRT_END
1087 
1088 
1089 IRT_ENTRY(void, InterpreterRuntime::post_method_exit(JavaThread *thread))
1090   JvmtiExport::post_method_exit(thread, InterpreterRuntime::method(thread), InterpreterRuntime::last_frame(thread));
1091 IRT_END
1092 
1093 IRT_LEAF(int, InterpreterRuntime::interpreter_contains(address pc))
1094 {
1095   return (Interpreter::contains(pc) ? 1 : 0);
1096 }
1097 IRT_END
1098 
1099 
1100 // Implementation of SignatureHandlerLibrary
1101 
1102 address SignatureHandlerLibrary::set_handler_blob() {
1103   BufferBlob* handler_blob = BufferBlob::create("native signature handlers", blob_size);
1104   if (handler_blob == NULL) {
1105     return NULL;
1106   }
1107   address handler = handler_blob->instructions_begin();
1108   _handler_blob = handler_blob;
1109   _handler = handler;
1110   return handler;
1111 }
1112 
1113 void SignatureHandlerLibrary::initialize() {
1114   if (_fingerprints != NULL) {
1115     return;
1116   }
1117   if (set_handler_blob() == NULL) {
1118     vm_exit_out_of_memory(blob_size, "native signature handlers");
1119   }
1120 
1121   BufferBlob* bb = BufferBlob::create("Signature Handler Temp Buffer",
1122                                       SignatureHandlerLibrary::buffer_size);
1123   _buffer = bb->instructions_begin();
1124 
1125   _fingerprints = new(ResourceObj::C_HEAP)GrowableArray<uint64_t>(32, true);
1126   _handlers     = new(ResourceObj::C_HEAP)GrowableArray<address>(32, true);
1127 }
1128 
1129 address SignatureHandlerLibrary::set_handler(CodeBuffer* buffer) {
1130   address handler   = _handler;
1131   int     code_size = buffer->pure_code_size();
1132   if (handler + code_size > _handler_blob->instructions_end()) {
1133     // get a new handler blob
1134     handler = set_handler_blob();
1135   }
1136   if (handler != NULL) {
1137     memcpy(handler, buffer->code_begin(), code_size);
1138     pd_set_handler(handler);
1139     ICache::invalidate_range(handler, code_size);
1140     _handler = handler + code_size;
1141   }
1142   return handler;
1143 }
1144 
1145 void SignatureHandlerLibrary::add(methodHandle method) {
1146   if (method->signature_handler() == NULL) {
1147     // use slow signature handler if we can't do better
1148     int handler_index = -1;
1149     // check if we can use customized (fast) signature handler
1150     if (UseFastSignatureHandlers && method->size_of_parameters() <= Fingerprinter::max_size_of_parameters) {
1151       // use customized signature handler
1152       MutexLocker mu(SignatureHandlerLibrary_lock);
1153       // make sure data structure is initialized
1154       initialize();
1155       // lookup method signature's fingerprint
1156       uint64_t fingerprint = Fingerprinter(method).fingerprint();
1157       handler_index = _fingerprints->find(fingerprint);
1158       // create handler if necessary
1159       if (handler_index < 0) {
1160         ResourceMark rm;
1161         ptrdiff_t align_offset = (address)
1162           round_to((intptr_t)_buffer, CodeEntryAlignment) - (address)_buffer;
1163         CodeBuffer buffer((address)(_buffer + align_offset),
1164                           SignatureHandlerLibrary::buffer_size - align_offset);
1165         InterpreterRuntime::SignatureHandlerGenerator(method, &buffer).generate(fingerprint);
1166         // copy into code heap
1167         address handler = set_handler(&buffer);
1168         if (handler == NULL) {
1169           // use slow signature handler
1170         } else {
1171           // debugging suppport
1172           if (PrintSignatureHandlers) {
1173             tty->cr();
1174             tty->print_cr("argument handler #%d for: %s %s (fingerprint = " UINT64_FORMAT ", %d bytes generated)",
1175                           _handlers->length(),
1176                           (method->is_static() ? "static" : "receiver"),
1177                           method->name_and_sig_as_C_string(),
1178                           fingerprint,
1179                           buffer.code_size());
1180             Disassembler::decode(handler, handler + buffer.code_size());
1181 #ifndef PRODUCT
1182             tty->print_cr(" --- associated result handler ---");
1183             address rh_begin = Interpreter::result_handler(method()->result_type());
1184             address rh_end = rh_begin;
1185             while (*(int*)rh_end != 0) {
1186               rh_end += sizeof(int);
1187             }
1188             Disassembler::decode(rh_begin, rh_end);
1189 #endif
1190           }
1191           // add handler to library
1192           _fingerprints->append(fingerprint);
1193           _handlers->append(handler);
1194           // set handler index
1195           assert(_fingerprints->length() == _handlers->length(), "sanity check");
1196           handler_index = _fingerprints->length() - 1;
1197         }
1198       }
1199     } else {
1200       CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
1201     }
1202     if (handler_index < 0) {
1203       // use generic signature handler
1204       method->set_signature_handler(Interpreter::slow_signature_handler());
1205     } else {
1206       // set handler
1207       method->set_signature_handler(_handlers->at(handler_index));
1208     }
1209   }
1210   assert(method->signature_handler() == Interpreter::slow_signature_handler() ||
1211          _handlers->find(method->signature_handler()) == _fingerprints->find(Fingerprinter(method).fingerprint()),
1212          "sanity check");
1213 }
1214 
1215 
1216 BufferBlob*              SignatureHandlerLibrary::_handler_blob = NULL;
1217 address                  SignatureHandlerLibrary::_handler      = NULL;
1218 GrowableArray<uint64_t>* SignatureHandlerLibrary::_fingerprints = NULL;
1219 GrowableArray<address>*  SignatureHandlerLibrary::_handlers     = NULL;
1220 address                  SignatureHandlerLibrary::_buffer       = NULL;
1221 
1222 
1223 IRT_ENTRY(void, InterpreterRuntime::prepare_native_call(JavaThread* thread, methodOopDesc* method))
1224   methodHandle m(thread, method);
1225   assert(m->is_native(), "sanity check");
1226   // lookup native function entry point if it doesn't exist
1227   bool in_base_library;
1228   if (!m->has_native_function()) {
1229     NativeLookup::lookup(m, in_base_library, CHECK);
1230   }
1231   // make sure signature handler is installed
1232   SignatureHandlerLibrary::add(m);
1233   // The interpreter entry point checks the signature handler first,
1234   // before trying to fetch the native entry point and klass mirror.
1235   // We must set the signature handler last, so that multiple processors
1236   // preparing the same method will be sure to see non-null entry & mirror.
1237 IRT_END
1238 
1239 #if defined(IA32) || defined(AMD64)
1240 IRT_LEAF(void, InterpreterRuntime::popframe_move_outgoing_args(JavaThread* thread, void* src_address, void* dest_address))
1241   if (src_address == dest_address) {
1242     return;
1243   }
1244   ResetNoHandleMark rnm; // In a LEAF entry.
1245   HandleMark hm;
1246   ResourceMark rm;
1247   frame fr = thread->last_frame();
1248   assert(fr.is_interpreted_frame(), "");
1249   jint bci = fr.interpreter_frame_bci();
1250   methodHandle mh(thread, fr.interpreter_frame_method());
1251   Bytecode_invoke* invoke = Bytecode_invoke_at(mh, bci);
1252   ArgumentSizeComputer asc(invoke->signature());
1253   int size_of_arguments = (asc.size() + (invoke->is_invokestatic() ? 0 : 1)); // receiver
1254   Copy::conjoint_bytes(src_address, dest_address,
1255                        size_of_arguments * Interpreter::stackElementSize());
1256 IRT_END
1257 #endif