1 /*

     2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    24 

    25 #include "precompiled.hpp"

    26 #include "classfile/javaClasses.inline.hpp"

    27 #include "classfile/systemDictionary.hpp"

    28 #include "classfile/vmSymbols.hpp"

    29 #include "code/codeCache.hpp"

    30 #include "compiler/compileBroker.hpp"

    31 #include "compiler/disassembler.hpp"

    32 #include "gc/shared/collectedHeap.hpp"

    33 #include "interpreter/interpreter.hpp"

    34 #include "interpreter/interpreterRuntime.hpp"

    35 #include "interpreter/linkResolver.hpp"

    36 #include "interpreter/templateTable.hpp"

    37 #include "logging/log.hpp"

    38 #include "memory/oopFactory.hpp"

    39 #include "memory/resourceArea.hpp"

    40 #include "memory/universe.inline.hpp"

    41 #include "oops/constantPool.hpp"

    42 #include "oops/instanceKlass.hpp"

    43 #include "oops/methodData.hpp"

    44 #include "oops/objArrayKlass.hpp"

    45 #include "oops/objArrayOop.inline.hpp"

    46 #include "oops/oop.inline.hpp"

    47 #include "oops/symbol.hpp"

    48 #include "prims/jvmtiExport.hpp"

    49 #include "prims/nativeLookup.hpp"

    50 #include "runtime/atomic.hpp"

    51 #include "runtime/biasedLocking.hpp"

    52 #include "runtime/compilationPolicy.hpp"

    53 #include "runtime/deoptimization.hpp"

    54 #include "runtime/fieldDescriptor.hpp"

    55 #include "runtime/handles.inline.hpp"

    56 #include "runtime/icache.hpp"

    57 #include "runtime/interfaceSupport.hpp"

    58 #include "runtime/java.hpp"

    59 #include "runtime/jfieldIDWorkaround.hpp"

    60 #include "runtime/osThread.hpp"

    61 #include "runtime/sharedRuntime.hpp"

    62 #include "runtime/stubRoutines.hpp"

    63 #include "runtime/synchronizer.hpp"

    64 #include "runtime/threadCritical.hpp"

    65 #include "utilities/align.hpp"

    66 #include "utilities/events.hpp"

    67 #ifdef COMPILER2

    68 #include "opto/runtime.hpp"

    69 #endif

    70 

    71 class UnlockFlagSaver {

    72   private:

    73     JavaThread* _thread;

    74     bool _do_not_unlock;

    75   public:

    76     UnlockFlagSaver(JavaThread* t) {

    77       _thread = t;

    78       _do_not_unlock = t->do_not_unlock_if_synchronized();

    79       t->set_do_not_unlock_if_synchronized(false);

    80     }

    81     ~UnlockFlagSaver() {

    82       _thread->set_do_not_unlock_if_synchronized(_do_not_unlock);

    83     }

    84 };

    85 

    86 //------------------------------------------------------------------------------------------------------------------------

    87 // State accessors

    88 

    89 void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {

    90   last_frame(thread).interpreter_frame_set_bcp(bcp);

    91   if (ProfileInterpreter) {

    92     // ProfileTraps uses MDOs independently of ProfileInterpreter.

    93     // That is why we must check both ProfileInterpreter and mdo != NULL.

    94     MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();

    95     if (mdo != NULL) {

    96       NEEDS_CLEANUP;

    97       last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));

    98     }

    99   }

   100 }

   101 

   102 //------------------------------------------------------------------------------------------------------------------------

   103 // Constants

   104 

   105 

   106 IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))

   107   // access constant pool

   108   ConstantPool* pool = method(thread)->constants();

   109   int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);

   110   constantTag tag = pool->tag_at(index);

   111 

   112   assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");

   113   Klass* klass = pool->klass_at(index, CHECK);

   114     oop java_class = klass->java_mirror();

   115     thread->set_vm_result(java_class);

   116 IRT_END

   117 

   118 IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {

   119   assert(bytecode == Bytecodes::_fast_aldc ||

   120          bytecode == Bytecodes::_fast_aldc_w, "wrong bc");

   121   ResourceMark rm(thread);

   122   methodHandle m (thread, method(thread));

   123   Bytecode_loadconstant ldc(m, bci(thread));

   124   oop result = ldc.resolve_constant(CHECK);

   125 #ifdef ASSERT

   126   {

   127     // The bytecode wrappers aren't GC-safe so construct a new one

   128     Bytecode_loadconstant ldc2(m, bci(thread));

   129     oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());

   130     assert(result == coop, "expected result for assembly code");

   131   }

   132 #endif

   133   thread->set_vm_result(result);

   134 }

   135 IRT_END

   136 

   137 

   138 //------------------------------------------------------------------------------------------------------------------------

   139 // Allocation

   140 

   141 IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))

   142   Klass* k = pool->klass_at(index, CHECK);

   143   InstanceKlass* klass = InstanceKlass::cast(k);

   144 

   145   // Make sure we are not instantiating an abstract klass

   146   klass->check_valid_for_instantiation(true, CHECK);

   147 

   148   // Make sure klass is initialized

   149   klass->initialize(CHECK);

   150 

   151   // At this point the class may not be fully initialized

   152   // because of recursive initialization. If it is fully

   153   // initialized & has_finalized is not set, we rewrite

   154   // it into its fast version (Note: no locking is needed

   155   // here since this is an atomic byte write and can be

   156   // done more than once).

   157   //

   158   // Note: In case of classes with has_finalized we don't

   159   //       rewrite since that saves us an extra check in

   160   //       the fast version which then would call the

   161   //       slow version anyway (and do a call back into

   162   //       Java).

   163   //       If we have a breakpoint, then we don't rewrite

   164   //       because the _breakpoint bytecode would be lost.

   165   oop obj = klass->allocate_instance(CHECK);

   166   thread->set_vm_result(obj);

   167 IRT_END

   168 

   169 

   170 IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))

   171   oop obj = oopFactory::new_typeArray(type, size, CHECK);

   172   thread->set_vm_result(obj);

   173 IRT_END

   174 

   175 

   176 IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))

   177   Klass*    klass = pool->klass_at(index, CHECK);

   178   objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);

   179   thread->set_vm_result(obj);

   180 IRT_END

   181 

   182 

   183 IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))

   184   // We may want to pass in more arguments - could make this slightly faster

   185   ConstantPool* constants = method(thread)->constants();

   186   int          i = get_index_u2(thread, Bytecodes::_multianewarray);

   187   Klass* klass = constants->klass_at(i, CHECK);

   188   int   nof_dims = number_of_dimensions(thread);

   189   assert(klass->is_klass(), "not a class");

   190   assert(nof_dims >= 1, "multianewarray rank must be nonzero");

   191 

   192   // We must create an array of jints to pass to multi_allocate.

   193   ResourceMark rm(thread);

   194   const int small_dims = 10;

   195   jint dim_array[small_dims];

   196   jint *dims = &dim_array[0];

   197   if (nof_dims > small_dims) {

   198     dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);

   199   }

   200   for (int index = 0; index < nof_dims; index++) {

   201     // offset from first_size_address is addressed as local[index]

   202     int n = Interpreter::local_offset_in_bytes(index)/jintSize;

   203     dims[index] = first_size_address[n];

   204   }

   205   oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);

   206   thread->set_vm_result(obj);

   207 IRT_END

   208 

   209 

   210 IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))

   211   assert(oopDesc::is_oop(obj), "must be a valid oop");

   212   assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");

   213   InstanceKlass::register_finalizer(instanceOop(obj), CHECK);

   214 IRT_END

   215 

   216 

   217 // Quicken instance-of and check-cast bytecodes

   218 IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))

   219   // Force resolving; quicken the bytecode

   220   int which = get_index_u2(thread, Bytecodes::_checkcast);

   221   ConstantPool* cpool = method(thread)->constants();

   222   // We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded

   223   // program we might have seen an unquick'd bytecode in the interpreter but have another

   224   // thread quicken the bytecode before we get here.

   225   // assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );

   226   Klass* klass = cpool->klass_at(which, CHECK);

   227   thread->set_vm_result_2(klass);

   228 IRT_END

   229 

   230 

   231 //------------------------------------------------------------------------------------------------------------------------

   232 // Exceptions

   233 

   234 void InterpreterRuntime::note_trap_inner(JavaThread* thread, int reason,

   235                                          const methodHandle& trap_method, int trap_bci, TRAPS) {

   236   if (trap_method.not_null()) {

   237     MethodData* trap_mdo = trap_method->method_data();

   238     if (trap_mdo == NULL) {

   239       Method::build_interpreter_method_data(trap_method, THREAD);

   240       if (HAS_PENDING_EXCEPTION) {

   241         assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())),

   242                "we expect only an OOM error here");

   243         CLEAR_PENDING_EXCEPTION;

   244       }

   245       trap_mdo = trap_method->method_data();

   246       // and fall through...

   247     }

   248     if (trap_mdo != NULL) {

   249       // Update per-method count of trap events.  The interpreter

   250       // is updating the MDO to simulate the effect of compiler traps.

   251       Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);

   252     }

   253   }

   254 }

   255 

   256 // Assume the compiler is (or will be) interested in this event.

   257 // If necessary, create an MDO to hold the information, and record it.

   258 void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {

   259   assert(ProfileTraps, "call me only if profiling");

   260   methodHandle trap_method(thread, method(thread));

   261   int trap_bci = trap_method->bci_from(bcp(thread));

   262   note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);

   263 }

   264 

   265 #ifdef CC_INTERP

   266 // As legacy note_trap, but we have more arguments.

   267 IRT_ENTRY(void, InterpreterRuntime::note_trap(JavaThread* thread, int reason, Method *method, int trap_bci))

   268   methodHandle trap_method(method);

   269   note_trap_inner(thread, reason, trap_method, trap_bci, THREAD);

   270 IRT_END

   271 

   272 // Class Deoptimization is not visible in BytecodeInterpreter, so we need a wrapper

   273 // for each exception.

   274 void InterpreterRuntime::note_nullCheck_trap(JavaThread* thread, Method *method, int trap_bci)

   275   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_null_check, method, trap_bci); }

   276 void InterpreterRuntime::note_div0Check_trap(JavaThread* thread, Method *method, int trap_bci)

   277   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_div0_check, method, trap_bci); }

   278 void InterpreterRuntime::note_rangeCheck_trap(JavaThread* thread, Method *method, int trap_bci)

   279   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_range_check, method, trap_bci); }

   280 void InterpreterRuntime::note_classCheck_trap(JavaThread* thread, Method *method, int trap_bci)

   281   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_class_check, method, trap_bci); }

   282 void InterpreterRuntime::note_arrayCheck_trap(JavaThread* thread, Method *method, int trap_bci)

   283   { if (ProfileTraps) note_trap(thread, Deoptimization::Reason_array_check, method, trap_bci); }

   284 #endif // CC_INTERP

   285 

   286 

   287 static Handle get_preinitialized_exception(Klass* k, TRAPS) {

   288   // get klass

   289   InstanceKlass* klass = InstanceKlass::cast(k);

   290   assert(klass->is_initialized(),

   291          "this klass should have been initialized during VM initialization");

   292   // create instance - do not call constructor since we may have no

   293   // (java) stack space left (should assert constructor is empty)

   294   Handle exception;

   295   oop exception_oop = klass->allocate_instance(CHECK_(exception));

   296   exception = Handle(THREAD, exception_oop);

   297   if (StackTraceInThrowable) {

   298     java_lang_Throwable::fill_in_stack_trace(exception);

   299   }

   300   return exception;

   301 }

   302 

   303 // Special handling for stack overflow: since we don't have any (java) stack

   304 // space left we use the pre-allocated & pre-initialized StackOverflowError

   305 // klass to create an stack overflow error instance.  We do not call its

   306 // constructor for the same reason (it is empty, anyway).

   307 IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))

   308   Handle exception = get_preinitialized_exception(

   309                                  SystemDictionary::StackOverflowError_klass(),

   310                                  CHECK);

   311   // Increment counter for hs_err file reporting

   312   Atomic::inc(&Exceptions::_stack_overflow_errors);

   313   THROW_HANDLE(exception);

   314 IRT_END

   315 

   316 IRT_ENTRY(void, InterpreterRuntime::throw_delayed_StackOverflowError(JavaThread* thread))

   317   Handle exception = get_preinitialized_exception(

   318                                  SystemDictionary::StackOverflowError_klass(),

   319                                  CHECK);

   320   java_lang_Throwable::set_message(exception(),

   321           Universe::delayed_stack_overflow_error_message());

   322   // Increment counter for hs_err file reporting

   323   Atomic::inc(&Exceptions::_stack_overflow_errors);

   324   THROW_HANDLE(exception);

   325 IRT_END

   326 

   327 IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))

   328   // lookup exception klass

   329   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);

   330   if (ProfileTraps) {

   331     if (s == vmSymbols::java_lang_ArithmeticException()) {

   332       note_trap(thread, Deoptimization::Reason_div0_check, CHECK);

   333     } else if (s == vmSymbols::java_lang_NullPointerException()) {

   334       note_trap(thread, Deoptimization::Reason_null_check, CHECK);

   335     }

   336   }

   337   // create exception

   338   Handle exception = Exceptions::new_exception(thread, s, message);

   339   thread->set_vm_result(exception());

   340 IRT_END

   341 

   342 

   343 IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))

   344   ResourceMark rm(thread);

   345   const char* klass_name = obj->klass()->external_name();

   346   // lookup exception klass

   347   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);

   348   if (ProfileTraps) {

   349     note_trap(thread, Deoptimization::Reason_class_check, CHECK);

   350   }

   351   // create exception, with klass name as detail message

   352   Handle exception = Exceptions::new_exception(thread, s, klass_name);

   353   thread->set_vm_result(exception());

   354 IRT_END

   355 

   356 

   357 IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))

   358   char message[jintAsStringSize];

   359   // lookup exception klass

   360   TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);

   361   if (ProfileTraps) {

   362     note_trap(thread, Deoptimization::Reason_range_check, CHECK);

   363   }

   364   // create exception

   365   sprintf(message, "%d", index);

   366   THROW_MSG(s, message);

   367 IRT_END

   368 

   369 IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(

   370   JavaThread* thread, oopDesc* obj))

   371 

   372   ResourceMark rm(thread);

   373   char* message = SharedRuntime::generate_class_cast_message(

   374     thread, obj->klass());

   375 

   376   if (ProfileTraps) {

   377     note_trap(thread, Deoptimization::Reason_class_check, CHECK);

   378   }

   379 

   380   // create exception

   381   THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);

   382 IRT_END

   383 

   384 // exception_handler_for_exception(...) returns the continuation address,

   385 // the exception oop (via TLS) and sets the bci/bcp for the continuation.

   386 // The exception oop is returned to make sure it is preserved over GC (it

   387 // is only on the stack if the exception was thrown explicitly via athrow).

   388 // During this operation, the expression stack contains the values for the

   389 // bci where the exception happened. If the exception was propagated back

   390 // from a call, the expression stack contains the values for the bci at the

   391 // invoke w/o arguments (i.e., as if one were inside the call).

   392 IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))

   393 

   394   Handle             h_exception(thread, exception);

   395   methodHandle       h_method   (thread, method(thread));

   396   constantPoolHandle h_constants(thread, h_method->constants());

   397   bool               should_repeat;

   398   int                handler_bci;

   399   int                current_bci = bci(thread);

   400 

   401   if (thread->frames_to_pop_failed_realloc() > 0) {

   402     // Allocation of scalar replaced object used in this frame

   403     // failed. Unconditionally pop the frame.

   404     thread->dec_frames_to_pop_failed_realloc();

   405     thread->set_vm_result(h_exception());

   406     // If the method is synchronized we already unlocked the monitor

   407     // during deoptimization so the interpreter needs to skip it when

   408     // the frame is popped.

   409     thread->set_do_not_unlock_if_synchronized(true);

   410 #ifdef CC_INTERP

   411     return (address) -1;

   412 #else

   413     return Interpreter::remove_activation_entry();

   414 #endif

   415   }

   416 

   417   // Need to do this check first since when _do_not_unlock_if_synchronized

   418   // is set, we don't want to trigger any classloading which may make calls

   419   // into java, or surprisingly find a matching exception handler for bci 0

   420   // since at this moment the method hasn't been "officially" entered yet.

   421   if (thread->do_not_unlock_if_synchronized()) {

   422     ResourceMark rm;

   423     assert(current_bci == 0,  "bci isn't zero for do_not_unlock_if_synchronized");

   424     thread->set_vm_result(exception);

   425 #ifdef CC_INTERP

   426     return (address) -1;

   427 #else

   428     return Interpreter::remove_activation_entry();

   429 #endif

   430   }

   431 

   432   do {

   433     should_repeat = false;

   434 

   435     // assertions

   436 #ifdef ASSERT

   437     assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");

   438     // Check that exception is a subclass of Throwable, otherwise we have a VerifyError

   439     if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {

   440       if (ExitVMOnVerifyError) vm_exit(-1);

   441       ShouldNotReachHere();

   442     }

   443 #endif

   444 

   445     // tracing

   446     if (log_is_enabled(Info, exceptions)) {

   447       ResourceMark rm(thread);

   448       stringStream tempst;

   449       tempst.print("interpreter method <%s>\n"

   450                    " at bci %d for thread " INTPTR_FORMAT,

   451                    h_method->print_value_string(), current_bci, p2i(thread));

   452       Exceptions::log_exception(h_exception, tempst);

   453     }

   454 // Don't go paging in something which won't be used.

   455 //     else if (extable->length() == 0) {

   456 //       // disabled for now - interpreter is not using shortcut yet

   457 //       // (shortcut is not to call runtime if we have no exception handlers)

   458 //       // warning("performance bug: should not call runtime if method has no exception handlers");

   459 //     }

   460     // for AbortVMOnException flag

   461     Exceptions::debug_check_abort(h_exception);

   462 

   463     // exception handler lookup

   464     Klass* klass = h_exception->klass();

   465     handler_bci = Method::fast_exception_handler_bci_for(h_method, klass, current_bci, THREAD);

   466     if (HAS_PENDING_EXCEPTION) {

   467       // We threw an exception while trying to find the exception handler.

   468       // Transfer the new exception to the exception handle which will

   469       // be set into thread local storage, and do another lookup for an

   470       // exception handler for this exception, this time starting at the

   471       // BCI of the exception handler which caused the exception to be

   472       // thrown (bug 4307310).

   473       h_exception = Handle(THREAD, PENDING_EXCEPTION);

   474       CLEAR_PENDING_EXCEPTION;

   475       if (handler_bci >= 0) {

   476         current_bci = handler_bci;

   477         should_repeat = true;

   478       }

   479     }

   480   } while (should_repeat == true);

   481 

   482 #if INCLUDE_JVMCI

   483   if (EnableJVMCI && h_method->method_data() != NULL) {

   484     ResourceMark rm(thread);

   485     ProfileData* pdata = h_method->method_data()->allocate_bci_to_data(current_bci, NULL);

   486     if (pdata != NULL && pdata->is_BitData()) {

   487       BitData* bit_data = (BitData*) pdata;

   488       bit_data->set_exception_seen();

   489     }

   490   }

   491 #endif

   492 

   493   // notify JVMTI of an exception throw; JVMTI will detect if this is a first

   494   // time throw or a stack unwinding throw and accordingly notify the debugger

   495   if (JvmtiExport::can_post_on_exceptions()) {

   496     JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());

   497   }

   498 

   499 #ifdef CC_INTERP

   500   address continuation = (address)(intptr_t) handler_bci;

   501 #else

   502   address continuation = NULL;

   503 #endif

   504   address handler_pc = NULL;

   505   if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {

   506     // Forward exception to callee (leaving bci/bcp untouched) because (a) no

   507     // handler in this method, or (b) after a stack overflow there is not yet

   508     // enough stack space available to reprotect the stack.

   509 #ifndef CC_INTERP

   510     continuation = Interpreter::remove_activation_entry();

   511 #endif

   512 #if COMPILER2_OR_JVMCI

   513     // Count this for compilation purposes

   514     h_method->interpreter_throwout_increment(THREAD);

   515 #endif

   516   } else {

   517     // handler in this method => change bci/bcp to handler bci/bcp and continue there

   518     handler_pc = h_method->code_base() + handler_bci;

   519 #ifndef CC_INTERP

   520     set_bcp_and_mdp(handler_pc, thread);

   521     continuation = Interpreter::dispatch_table(vtos)[*handler_pc];

   522 #endif

   523   }

   524   // notify debugger of an exception catch

   525   // (this is good for exceptions caught in native methods as well)

   526   if (JvmtiExport::can_post_on_exceptions()) {

   527     JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));

   528   }

   529 

   530   thread->set_vm_result(h_exception());

   531   return continuation;

   532 IRT_END

   533 

   534 

   535 IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))

   536   assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");

   537   // nothing to do - eventually we should remove this code entirely (see comments @ call sites)

   538 IRT_END

   539 

   540 

   541 IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))

   542   THROW(vmSymbols::java_lang_AbstractMethodError());

   543 IRT_END

   544 

   545 

   546 IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))

   547   THROW(vmSymbols::java_lang_IncompatibleClassChangeError());

   548 IRT_END

   549 

   550 

   551 //------------------------------------------------------------------------------------------------------------------------

   552 // Fields

   553 //

   554 

   555 void InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode) {

   556   Thread* THREAD = thread;

   557   // resolve field

   558   fieldDescriptor info;

   559   constantPoolHandle pool(thread, method(thread)->constants());

   560   methodHandle m(thread, method(thread));

   561   bool is_put    = (bytecode == Bytecodes::_putfield  || bytecode == Bytecodes::_nofast_putfield ||

   562                     bytecode == Bytecodes::_putstatic);

   563   bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);

   564 

   565   {

   566     JvmtiHideSingleStepping jhss(thread);

   567     LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),

   568                                        m, bytecode, CHECK);

   569   } // end JvmtiHideSingleStepping

   570 

   571   // check if link resolution caused cpCache to be updated

   572   ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);

   573   if (cp_cache_entry->is_resolved(bytecode)) return;

   574 

   575   // compute auxiliary field attributes

   576   TosState state  = as_TosState(info.field_type());

   577 

   578   // Resolution of put instructions on final fields is delayed. That is required so that

   579   // exceptions are thrown at the correct place (when the instruction is actually invoked).

   580   // If we do not resolve an instruction in the current pass, leaving the put_code

   581   // set to zero will cause the next put instruction to the same field to reresolve.

   582 

   583   // Resolution of put instructions to final instance fields with invalid updates (i.e.,

   584   // to final instance fields with updates originating from a method different than <init>)

   585   // is inhibited. A putfield instruction targeting an instance final field must throw

   586   // an IllegalAccessError if the instruction is not in an instance

   587   // initializer method <init>. If resolution were not inhibited, a putfield

   588   // in an initializer method could be resolved in the initializer. Subsequent

   589   // putfield instructions to the same field would then use cached information.

   590   // As a result, those instructions would not pass through the VM. That is,

   591   // checks in resolve_field_access() would not be executed for those instructions

   592   // and the required IllegalAccessError would not be thrown.

   593   //

   594   // Also, we need to delay resolving getstatic and putstatic instructions until the

   595   // class is initialized.  This is required so that access to the static

   596   // field will call the initialization function every time until the class

   597   // is completely initialized ala. in 2.17.5 in JVM Specification.

   598   InstanceKlass* klass = InstanceKlass::cast(info.field_holder());

   599   bool uninitialized_static = is_static && !klass->is_initialized();

   600   bool has_initialized_final_update = info.field_holder()->major_version() >= 53 &&

   601                                       info.has_initialized_final_update();

   602   assert(!(has_initialized_final_update && !info.access_flags().is_final()), "Fields with initialized final updates must be final");

   603 

   604   Bytecodes::Code get_code = (Bytecodes::Code)0;

   605   Bytecodes::Code put_code = (Bytecodes::Code)0;

   606   if (!uninitialized_static) {

   607     get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);

   608     if ((is_put && !has_initialized_final_update) || !info.access_flags().is_final()) {

   609       put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);

   610     }

   611   }

   612 

   613   cp_cache_entry->set_field(

   614     get_code,

   615     put_code,

   616     info.field_holder(),

   617     info.index(),

   618     info.offset(),

   619     state,

   620     info.access_flags().is_final(),

   621     info.access_flags().is_volatile(),

   622     pool->pool_holder()

   623   );

   624 }

   625 

   626 

   627 //------------------------------------------------------------------------------------------------------------------------

   628 // Synchronization

   629 //

   630 // The interpreter's synchronization code is factored out so that it can

   631 // be shared by method invocation and synchronized blocks.

   632 //%note synchronization_3

   633 

   634 //%note monitor_1

   635 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))

   636 #ifdef ASSERT

   637   thread->last_frame().interpreter_frame_verify_monitor(elem);

   638 #endif

   639   if (PrintBiasedLockingStatistics) {

   640     Atomic::inc(BiasedLocking::slow_path_entry_count_addr());

   641   }

   642   Handle h_obj(thread, elem->obj());

   643   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),

   644          "must be NULL or an object");

   645   if (UseBiasedLocking) {

   646     // Retry fast entry if bias is revoked to avoid unnecessary inflation

   647     ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);

   648   } else {

   649     ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);

   650   }

   651   assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),

   652          "must be NULL or an object");

   653 #ifdef ASSERT

   654   thread->last_frame().interpreter_frame_verify_monitor(elem);

   655 #endif

   656 IRT_END

   657 

   658 

   659 //%note monitor_1

   660 IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))

   661 #ifdef ASSERT

   662   thread->last_frame().interpreter_frame_verify_monitor(elem);

   663 #endif

   664   Handle h_obj(thread, elem->obj());

   665   assert(Universe::heap()->is_in_reserved_or_null(h_obj()),

   666          "must be NULL or an object");

   667   if (elem == NULL || h_obj()->is_unlocked()) {

   668     THROW(vmSymbols::java_lang_IllegalMonitorStateException());

   669   }

   670   ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);

   671   // Free entry. This must be done here, since a pending exception might be installed on

   672   // exit. If it is not cleared, the exception handling code will try to unlock the monitor again.

   673   elem->set_obj(NULL);

   674 #ifdef ASSERT

   675   thread->last_frame().interpreter_frame_verify_monitor(elem);

   676 #endif

   677 IRT_END

   678 

   679 

   680 IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))

   681   THROW(vmSymbols::java_lang_IllegalMonitorStateException());

   682 IRT_END

   683 

   684 

   685 IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))

   686   // Returns an illegal exception to install into the current thread. The

   687   // pending_exception flag is cleared so normal exception handling does not

   688   // trigger. Any current installed exception will be overwritten. This

   689   // method will be called during an exception unwind.

   690 

   691   assert(!HAS_PENDING_EXCEPTION, "no pending exception");

   692   Handle exception(thread, thread->vm_result());

   693   assert(exception() != NULL, "vm result should be set");

   694   thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)

   695   if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {

   696     exception = get_preinitialized_exception(

   697                        SystemDictionary::IllegalMonitorStateException_klass(),

   698                        CATCH);

   699   }

   700   thread->set_vm_result(exception());

   701 IRT_END

   702 

   703 

   704 //------------------------------------------------------------------------------------------------------------------------

   705 // Invokes

   706 

   707 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))

   708   return method->orig_bytecode_at(method->bci_from(bcp));

   709 IRT_END

   710 

   711 IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))

   712   method->set_orig_bytecode_at(method->bci_from(bcp), new_code);

   713 IRT_END

   714 

   715 IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))

   716   JvmtiExport::post_raw_breakpoint(thread, method, bcp);

   717 IRT_END

   718 

   719 void InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode) {

   720   Thread* THREAD = thread;

   721   // extract receiver from the outgoing argument list if necessary

   722   Handle receiver(thread, NULL);

   723   if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface ||

   724       bytecode == Bytecodes::_invokespecial) {

   725     ResourceMark rm(thread);

   726     methodHandle m (thread, method(thread));

   727     Bytecode_invoke call(m, bci(thread));

   728     Symbol* signature = call.signature();

   729     receiver = Handle(thread,

   730                   thread->last_frame().interpreter_callee_receiver(signature));

   731     assert(Universe::heap()->is_in_reserved_or_null(receiver()),

   732            "sanity check");

   733     assert(receiver.is_null() ||

   734            !Universe::heap()->is_in_reserved(receiver->klass()),

   735            "sanity check");

   736   }

   737 

   738   // resolve method

   739   CallInfo info;

   740   constantPoolHandle pool(thread, method(thread)->constants());

   741 

   742   {

   743     JvmtiHideSingleStepping jhss(thread);

   744     LinkResolver::resolve_invoke(info, receiver, pool,

   745                                  get_index_u2_cpcache(thread, bytecode), bytecode,

   746                                  CHECK);

   747     if (JvmtiExport::can_hotswap_or_post_breakpoint()) {

   748       int retry_count = 0;

   749       while (info.resolved_method()->is_old()) {

   750         // It is very unlikely that method is redefined more than 100 times

   751         // in the middle of resolve. If it is looping here more than 100 times

   752         // means then there could be a bug here.

   753         guarantee((retry_count++ < 100),

   754                   "Could not resolve to latest version of redefined method");

   755         // method is redefined in the middle of resolve so re-try.

   756         LinkResolver::resolve_invoke(info, receiver, pool,

   757                                      get_index_u2_cpcache(thread, bytecode), bytecode,

   758                                      CHECK);

   759       }

   760     }

   761   } // end JvmtiHideSingleStepping

   762 

   763   // check if link resolution caused cpCache to be updated

   764   ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);

   765   if (cp_cache_entry->is_resolved(bytecode)) return;

   766 

   767 #ifdef ASSERT

   768   if (bytecode == Bytecodes::_invokeinterface) {

   769     if (info.resolved_method()->method_holder() ==

   770                                             SystemDictionary::Object_klass()) {

   771       // NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec

   772       // (see also CallInfo::set_interface for details)

   773       assert(info.call_kind() == CallInfo::vtable_call ||

   774              info.call_kind() == CallInfo::direct_call, "");

   775       methodHandle rm = info.resolved_method();

   776       assert(rm->is_final() || info.has_vtable_index(),

   777              "should have been set already");

   778     } else if (!info.resolved_method()->has_itable_index()) {

   779       // Resolved something like CharSequence.toString.  Use vtable not itable.

   780       assert(info.call_kind() != CallInfo::itable_call, "");

   781     } else {

   782       // Setup itable entry

   783       assert(info.call_kind() == CallInfo::itable_call, "");

   784       int index = info.resolved_method()->itable_index();

   785       assert(info.itable_index() == index, "");

   786     }

   787   } else if (bytecode == Bytecodes::_invokespecial) {

   788     assert(info.call_kind() == CallInfo::direct_call, "must be direct call");

   789   } else {

   790     assert(info.call_kind() == CallInfo::direct_call ||

   791            info.call_kind() == CallInfo::vtable_call, "");

   792   }

   793 #endif

   794   // Get sender or sender's host_klass, and only set cpCache entry to resolved if

   795   // it is not an interface.  The receiver for invokespecial calls within interface

   796   // methods must be checked for every call.

   797   InstanceKlass* sender = pool->pool_holder();

   798   sender = sender->is_anonymous() ? sender->host_klass() : sender;

   799 

   800   switch (info.call_kind()) {

   801   case CallInfo::direct_call:

   802     cp_cache_entry->set_direct_call(

   803       bytecode,

   804       info.resolved_method(),

   805       sender->is_interface());

   806     break;

   807   case CallInfo::vtable_call:

   808     cp_cache_entry->set_vtable_call(

   809       bytecode,

   810       info.resolved_method(),

   811       info.vtable_index());

   812     break;

   813   case CallInfo::itable_call:

   814     cp_cache_entry->set_itable_call(

   815       bytecode,

   816       info.resolved_method(),

   817       info.itable_index());

   818     break;

   819   default:  ShouldNotReachHere();

   820   }

   821 }

   822 

   823 

   824 // First time execution:  Resolve symbols, create a permanent MethodType object.

   825 void InterpreterRuntime::resolve_invokehandle(JavaThread* thread) {

   826   Thread* THREAD = thread;

   827   const Bytecodes::Code bytecode = Bytecodes::_invokehandle;

   828 

   829   // resolve method

   830   CallInfo info;

   831   constantPoolHandle pool(thread, method(thread)->constants());

   832   {

   833     JvmtiHideSingleStepping jhss(thread);

   834     LinkResolver::resolve_invoke(info, Handle(), pool,

   835                                  get_index_u2_cpcache(thread, bytecode), bytecode,

   836                                  CHECK);

   837   } // end JvmtiHideSingleStepping

   838 

   839   ConstantPoolCacheEntry* cp_cache_entry = cache_entry(thread);

   840   cp_cache_entry->set_method_handle(pool, info);

   841 }

   842 

   843 // First time execution:  Resolve symbols, create a permanent CallSite object.

   844 void InterpreterRuntime::resolve_invokedynamic(JavaThread* thread) {

   845   Thread* THREAD = thread;

   846   const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;

   847 

   848   //TO DO: consider passing BCI to Java.

   849   //  int caller_bci = method(thread)->bci_from(bcp(thread));

   850 

   851   // resolve method

   852   CallInfo info;

   853   constantPoolHandle pool(thread, method(thread)->constants());

   854   int index = get_index_u4(thread, bytecode);

   855   {

   856     JvmtiHideSingleStepping jhss(thread);

   857     LinkResolver::resolve_invoke(info, Handle(), pool,

   858                                  index, bytecode, CHECK);

   859   } // end JvmtiHideSingleStepping

   860 

   861   ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);

   862   cp_cache_entry->set_dynamic_call(pool, info);

   863 }

   864 

   865 // This function is the interface to the assembly code. It returns the resolved

   866 // cpCache entry.  This doesn't safepoint, but the helper routines safepoint.

   867 // This function will check for redefinition!

   868 IRT_ENTRY(void, InterpreterRuntime::resolve_from_cache(JavaThread* thread, Bytecodes::Code bytecode)) {

   869   switch (bytecode) {

   870   case Bytecodes::_getstatic:

   871   case Bytecodes::_putstatic:

   872   case Bytecodes::_getfield:

   873   case Bytecodes::_putfield:

   874     resolve_get_put(thread, bytecode);

   875     break;

   876   case Bytecodes::_invokevirtual:

   877   case Bytecodes::_invokespecial:

   878   case Bytecodes::_invokestatic:

   879   case Bytecodes::_invokeinterface:

   880     resolve_invoke(thread, bytecode);

   881     break;

   882   case Bytecodes::_invokehandle:

   883     resolve_invokehandle(thread);

   884     break;

   885   case Bytecodes::_invokedynamic:

   886     resolve_invokedynamic(thread);

   887     break;

   888   default:

   889     fatal("unexpected bytecode: %s", Bytecodes::name(bytecode));

   890     break;

   891   }

   892 }

   893 IRT_END

   894 

   895 //------------------------------------------------------------------------------------------------------------------------

   896 // Miscellaneous

   897 

   898 

   899 nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {

   900   nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);

   901   assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");

   902   if (branch_bcp != NULL && nm != NULL) {

   903     // This was a successful request for an OSR nmethod.  Because

   904     // frequency_counter_overflow_inner ends with a safepoint check,

   905     // nm could have been unloaded so look it up again.  It's unsafe

   906     // to examine nm directly since it might have been freed and used

   907     // for something else.

   908     frame fr = thread->last_frame();

   909     Method* method =  fr.interpreter_frame_method();

   910     int bci = method->bci_from(fr.interpreter_frame_bcp());

   911     nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);

   912   }

   913 #ifndef PRODUCT

   914   if (TraceOnStackReplacement) {

   915     if (nm != NULL) {

   916       tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", p2i(nm->osr_entry()));

   917       nm->print();

   918     }

   919   }

   920 #endif

   921   return nm;

   922 }

   923 

   924 IRT_ENTRY(nmethod*,

   925           InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))

   926   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized

   927   // flag, in case this method triggers classloading which will call into Java.

   928   UnlockFlagSaver fs(thread);

   929 

   930   frame fr = thread->last_frame();

   931   assert(fr.is_interpreted_frame(), "must come from interpreter");

   932   methodHandle method(thread, fr.interpreter_frame_method());

   933   const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;

   934   const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;

   935 

   936   assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");

   937   nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);

   938   assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");

   939 

   940   if (osr_nm != NULL) {

   941     // We may need to do on-stack replacement which requires that no

   942     // monitors in the activation are biased because their

   943     // BasicObjectLocks will need to migrate during OSR. Force

   944     // unbiasing of all monitors in the activation now (even though

   945     // the OSR nmethod might be invalidated) because we don't have a

   946     // safepoint opportunity later once the migration begins.

   947     if (UseBiasedLocking) {

   948       ResourceMark rm;

   949       GrowableArray<Handle>* objects_to_revoke = new GrowableArray<Handle>();

   950       for( BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();

   951            kptr < fr.interpreter_frame_monitor_begin();

   952            kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {

   953         if( kptr->obj() != NULL ) {

   954           objects_to_revoke->append(Handle(THREAD, kptr->obj()));

   955         }

   956       }

   957       BiasedLocking::revoke(objects_to_revoke);

   958     }

   959   }

   960   return osr_nm;

   961 IRT_END

   962 

   963 IRT_LEAF(jint, InterpreterRuntime::bcp_to_di(Method* method, address cur_bcp))

   964   assert(ProfileInterpreter, "must be profiling interpreter");

   965   int bci = method->bci_from(cur_bcp);

   966   MethodData* mdo = method->method_data();

   967   if (mdo == NULL)  return 0;

   968   return mdo->bci_to_di(bci);

   969 IRT_END

   970 

   971 IRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))

   972   // use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized

   973   // flag, in case this method triggers classloading which will call into Java.

   974   UnlockFlagSaver fs(thread);

   975 

   976   assert(ProfileInterpreter, "must be profiling interpreter");

   977   frame fr = thread->last_frame();

   978   assert(fr.is_interpreted_frame(), "must come from interpreter");

   979   methodHandle method(thread, fr.interpreter_frame_method());

   980   Method::build_interpreter_method_data(method, THREAD);

   981   if (HAS_PENDING_EXCEPTION) {

   982     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");

   983     CLEAR_PENDING_EXCEPTION;

   984     // and fall through...

   985   }

   986 IRT_END

   987 

   988 

   989 #ifdef ASSERT

   990 IRT_LEAF(void, InterpreterRuntime::verify_mdp(Method* method, address bcp, address mdp))

   991   assert(ProfileInterpreter, "must be profiling interpreter");

   992 

   993   MethodData* mdo = method->method_data();

   994   assert(mdo != NULL, "must not be null");

   995 

   996   int bci = method->bci_from(bcp);

   997 

   998   address mdp2 = mdo->bci_to_dp(bci);

   999   if (mdp != mdp2) {

  1000     ResourceMark rm;

  1001     ResetNoHandleMark rnm; // In a LEAF entry.

  1002     HandleMark hm;

  1003     tty->print_cr("FAILED verify : actual mdp %p   expected mdp %p @ bci %d", mdp, mdp2, bci);

  1004     int current_di = mdo->dp_to_di(mdp);

  1005     int expected_di  = mdo->dp_to_di(mdp2);

  1006     tty->print_cr("  actual di %d   expected di %d", current_di, expected_di);

  1007     int expected_approx_bci = mdo->data_at(expected_di)->bci();

  1008     int approx_bci = -1;

  1009     if (current_di >= 0) {

  1010       approx_bci = mdo->data_at(current_di)->bci();

  1011     }

  1012     tty->print_cr("  actual bci is %d  expected bci %d", approx_bci, expected_approx_bci);

  1013     mdo->print_on(tty);

  1014     method->print_codes();

  1015   }

  1016   assert(mdp == mdp2, "wrong mdp");

  1017 IRT_END

  1018 #endif // ASSERT

  1019 

  1020 IRT_ENTRY(void, InterpreterRuntime::update_mdp_for_ret(JavaThread* thread, int return_bci))

  1021   assert(ProfileInterpreter, "must be profiling interpreter");

  1022   ResourceMark rm(thread);

  1023   HandleMark hm(thread);

  1024   frame fr = thread->last_frame();

  1025   assert(fr.is_interpreted_frame(), "must come from interpreter");

  1026   MethodData* h_mdo = fr.interpreter_frame_method()->method_data();

  1027 

  1028   // Grab a lock to ensure atomic access to setting the return bci and

  1029   // the displacement.  This can block and GC, invalidating all naked oops.

  1030   MutexLocker ml(RetData_lock);

  1031 

  1032   // ProfileData is essentially a wrapper around a derived oop, so we

  1033   // need to take the lock before making any ProfileData structures.

  1034   ProfileData* data = h_mdo->data_at(h_mdo->dp_to_di(fr.interpreter_frame_mdp()));

  1035   guarantee(data != NULL, "profile data must be valid");

  1036   RetData* rdata = data->as_RetData();

  1037   address new_mdp = rdata->fixup_ret(return_bci, h_mdo);

  1038   fr.interpreter_frame_set_mdp(new_mdp);

  1039 IRT_END

  1040 

  1041 IRT_ENTRY(MethodCounters*, InterpreterRuntime::build_method_counters(JavaThread* thread, Method* m))

  1042   MethodCounters* mcs = Method::build_method_counters(m, thread);

  1043   if (HAS_PENDING_EXCEPTION) {

  1044     assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");

  1045     CLEAR_PENDING_EXCEPTION;

  1046   }

  1047   return mcs;

  1048 IRT_END

  1049 

  1050 

  1051 IRT_ENTRY(void, InterpreterRuntime::at_safepoint(JavaThread* thread))

  1052   // We used to need an explict preserve_arguments here for invoke bytecodes. However,

  1053   // stack traversal automatically takes care of preserving arguments for invoke, so

  1054   // this is no longer needed.

  1055 

  1056   // IRT_END does an implicit safepoint check, hence we are guaranteed to block

  1057   // if this is called during a safepoint

  1058 

  1059   if (JvmtiExport::should_post_single_step()) {

  1060     // We are called during regular safepoints and when the VM is

  1061     // single stepping. If any thread is marked for single stepping,

  1062     // then we may have JVMTI work to do.

  1063     JvmtiExport::at_single_stepping_point(thread, method(thread), bcp(thread));

  1064   }

  1065 IRT_END

  1066 

  1067 IRT_ENTRY(void, InterpreterRuntime::post_field_access(JavaThread *thread, oopDesc* obj,

  1068 ConstantPoolCacheEntry *cp_entry))

  1069 

  1070   // check the access_flags for the field in the klass

  1071 

  1072   InstanceKlass* ik = InstanceKlass::cast(cp_entry->f1_as_klass());

  1073   int index = cp_entry->field_index();

  1074   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_ACCESS_WATCHED) == 0) return;

  1075 

  1076   bool is_static = (obj == NULL);

  1077   HandleMark hm(thread);

  1078 

  1079   Handle h_obj;

  1080   if (!is_static) {

  1081     // non-static field accessors have an object, but we need a handle

  1082     h_obj = Handle(thread, obj);

  1083   }

  1084   InstanceKlass* cp_entry_f1 = InstanceKlass::cast(cp_entry->f1_as_klass());

  1085   jfieldID fid = jfieldIDWorkaround::to_jfieldID(cp_entry_f1, cp_entry->f2_as_index(), is_static);

  1086   JvmtiExport::post_field_access(thread, method(thread), bcp(thread), cp_entry_f1, h_obj, fid);

  1087 IRT_END

  1088 

  1089 IRT_ENTRY(void, InterpreterRuntime::post_field_modification(JavaThread *thread,

  1090   oopDesc* obj, ConstantPoolCacheEntry *cp_entry, jvalue *value))

  1091 

  1092   Klass* k = cp_entry->f1_as_klass();

  1093 

  1094   // check the access_flags for the field in the klass

  1095   InstanceKlass* ik = InstanceKlass::cast(k);

  1096   int index = cp_entry->field_index();

  1097   // bail out if field modifications are not watched

  1098   if ((ik->field_access_flags(index) & JVM_ACC_FIELD_MODIFICATION_WATCHED) == 0) return;

  1099 

  1100   char sig_type = '\0';

  1101 

  1102   switch(cp_entry->flag_state()) {

  1103     case btos: sig_type = 'B'; break;

  1104     case ztos: sig_type = 'Z'; break;

  1105     case ctos: sig_type = 'C'; break;

  1106     case stos: sig_type = 'S'; break;

  1107     case itos: sig_type = 'I'; break;

  1108     case ftos: sig_type = 'F'; break;

  1109     case atos: sig_type = 'L'; break;

  1110     case ltos: sig_type = 'J'; break;

  1111     case dtos: sig_type = 'D'; break;

  1112     default:  ShouldNotReachHere(); return;

  1113   }

  1114   bool is_static = (obj == NULL);

  1115 

  1116   HandleMark hm(thread);

  1117   jfieldID fid = jfieldIDWorkaround::to_jfieldID(ik, cp_entry->f2_as_index(), is_static);

  1118   jvalue fvalue;

  1119 #ifdef _LP64

  1120   fvalue = *value;

  1121 #else

  1122   // Long/double values are stored unaligned and also noncontiguously with

  1123   // tagged stacks.  We can't just do a simple assignment even in the non-

  1124   // J/D cases because a C++ compiler is allowed to assume that a jvalue is

  1125   // 8-byte aligned, and interpreter stack slots are only 4-byte aligned.

  1126   // We assume that the two halves of longs/doubles are stored in interpreter

  1127   // stack slots in platform-endian order.

  1128   jlong_accessor u;

  1129   jint* newval = (jint*)value;

  1130   u.words[0] = newval[0];

  1131   u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag

  1132   fvalue.j = u.long_value;

  1133 #endif // _LP64

  1134