1 /*

     2  * Copyright 1999-2007 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/_ciMethod.cpp.incl"

    27 

    28 // ciMethod

    29 //

    30 // This class represents a methodOop in the HotSpot virtual

    31 // machine.

    32 

    33 

    34 // ------------------------------------------------------------------

    35 // ciMethod::ciMethod

    36 //

    37 // Loaded method.

    38 ciMethod::ciMethod(methodHandle h_m) : ciObject(h_m) {

    39   assert(h_m() != NULL, "no null method");

    40 

    41   // These fields are always filled in in loaded methods.

    42   _flags = ciFlags(h_m()->access_flags());

    43 

    44   // Easy to compute, so fill them in now.

    45   _max_stack          = h_m()->max_stack();

    46   _max_locals         = h_m()->max_locals();

    47   _code_size          = h_m()->code_size();

    48   _intrinsic_id       = h_m()->intrinsic_id();

    49   _handler_count      = h_m()->exception_table()->length() / 4;

    50   _uses_monitors      = h_m()->access_flags().has_monitor_bytecodes();

    51   _balanced_monitors  = !_uses_monitors || h_m()->access_flags().is_monitor_matching();

    52   _is_compilable      = !h_m()->is_not_compilable();

    53   // Lazy fields, filled in on demand.  Require allocation.

    54   _code               = NULL;

    55   _exception_handlers = NULL;

    56   _liveness           = NULL;

    57   _bcea = NULL;

    58   _method_blocks = NULL;

    59 #ifdef COMPILER2

    60   _flow               = NULL;

    61 #endif // COMPILER2

    62 

    63   if (JvmtiExport::can_hotswap_or_post_breakpoint() && _is_compilable) {

    64     // 6328518 check hotswap conditions under the right lock.

    65     MutexLocker locker(Compile_lock);

    66     if (Dependencies::check_evol_method(h_m()) != NULL) {

    67       _is_compilable = false;

    68     }

    69   } else {

    70     CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());

    71   }

    72 

    73   if (instanceKlass::cast(h_m()->method_holder())->is_linked()) {

    74     _can_be_statically_bound = h_m()->can_be_statically_bound();

    75   } else {

    76     // Have to use a conservative value in this case.

    77     _can_be_statically_bound = false;

    78   }

    79 

    80   // Adjust the definition of this condition to be more useful:

    81   // %%% take these conditions into account in vtable generation

    82   if (!_can_be_statically_bound && h_m()->is_private())

    83     _can_be_statically_bound = true;

    84   if (_can_be_statically_bound && h_m()->is_abstract())

    85     _can_be_statically_bound = false;

    86 

    87   ciEnv *env = CURRENT_ENV;

    88   // generating _signature may allow GC and therefore move m.

    89   // These fields are always filled in.

    90   _name = env->get_object(h_m()->name())->as_symbol();

    91   _holder = env->get_object(h_m()->method_holder())->as_instance_klass();

    92   ciSymbol* sig_symbol = env->get_object(h_m()->signature())->as_symbol();

    93   _signature = new (env->arena()) ciSignature(_holder, sig_symbol);

    94   _method_data = NULL;

    95   // Take a snapshot of these values, so they will be commensurate with the MDO.

    96   if (ProfileInterpreter) {

    97     int invcnt = h_m()->interpreter_invocation_count();

    98     // if the value overflowed report it as max int

    99     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;

   100     _interpreter_throwout_count   = h_m()->interpreter_throwout_count();

   101   } else {

   102     _interpreter_invocation_count = 0;

   103     _interpreter_throwout_count = 0;

   104   }

   105   if (_interpreter_invocation_count == 0)

   106     _interpreter_invocation_count = 1;

   107 }

   108 

   109 

   110 // ------------------------------------------------------------------

   111 // ciMethod::ciMethod

   112 //

   113 // Unloaded method.

   114 ciMethod::ciMethod(ciInstanceKlass* holder,

   115                    ciSymbol* name,

   116                    ciSymbol* signature) : ciObject(ciMethodKlass::make()) {

   117   // These fields are always filled in.

   118   _name = name;

   119   _holder = holder;

   120   _signature = new (CURRENT_ENV->arena()) ciSignature(_holder, signature);

   121   _intrinsic_id = vmIntrinsics::_none;

   122   _liveness = NULL;

   123   _can_be_statically_bound = false;

   124   _bcea = NULL;

   125   _method_blocks = NULL;

   126   _method_data = NULL;

   127 #ifdef COMPILER2

   128   _flow = NULL;

   129 #endif // COMPILER2

   130 }

   131 

   132 

   133 // ------------------------------------------------------------------

   134 // ciMethod::load_code

   135 //

   136 // Load the bytecodes and exception handler table for this method.

   137 void ciMethod::load_code() {

   138   VM_ENTRY_MARK;

   139   assert(is_loaded(), "only loaded methods have code");

   140 

   141   methodOop me = get_methodOop();

   142   Arena* arena = CURRENT_THREAD_ENV->arena();

   143 

   144   // Load the bytecodes.

   145   _code = (address)arena->Amalloc(code_size());

   146   memcpy(_code, me->code_base(), code_size());

   147 

   148   // Revert any breakpoint bytecodes in ci's copy

   149   if (_is_compilable && me->number_of_breakpoints() > 0) {

   150     BreakpointInfo* bp = instanceKlass::cast(me->method_holder())->breakpoints();

   151     for (; bp != NULL; bp = bp->next()) {

   152       if (bp->match(me)) {

   153         code_at_put(bp->bci(), bp->orig_bytecode());

   154       }

   155     }

   156   }

   157 

   158   // And load the exception table.

   159   typeArrayOop exc_table = me->exception_table();

   160 

   161   // Allocate one extra spot in our list of exceptions.  This

   162   // last entry will be used to represent the possibility that

   163   // an exception escapes the method.  See ciExceptionHandlerStream

   164   // for details.

   165   _exception_handlers =

   166     (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)

   167                                          * (_handler_count + 1));

   168   if (_handler_count > 0) {

   169     for (int i=0; i<_handler_count; i++) {

   170       int base = i*4;

   171       _exception_handlers[i] = new (arena) ciExceptionHandler(

   172                                 holder(),

   173             /* start    */      exc_table->int_at(base),

   174             /* limit    */      exc_table->int_at(base+1),

   175             /* goto pc  */      exc_table->int_at(base+2),

   176             /* cp index */      exc_table->int_at(base+3));

   177     }

   178   }

   179 

   180   // Put an entry at the end of our list to represent the possibility

   181   // of exceptional exit.

   182   _exception_handlers[_handler_count] =

   183     new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);

   184 

   185   if (CIPrintMethodCodes) {

   186     print_codes();

   187   }

   188 }

   189 

   190 

   191 // ------------------------------------------------------------------

   192 // ciMethod::has_linenumber_table

   193 //

   194 // length unknown until decompression

   195 bool    ciMethod::has_linenumber_table() const {

   196   check_is_loaded();

   197   VM_ENTRY_MARK;

   198   return get_methodOop()->has_linenumber_table();

   199 }

   200 

   201 

   202 // ------------------------------------------------------------------

   203 // ciMethod::compressed_linenumber_table

   204 u_char* ciMethod::compressed_linenumber_table() const {

   205   check_is_loaded();

   206   VM_ENTRY_MARK;

   207   return get_methodOop()->compressed_linenumber_table();

   208 }

   209 

   210 

   211 // ------------------------------------------------------------------

   212 // ciMethod::line_number_from_bci

   213 int ciMethod::line_number_from_bci(int bci) const {

   214   check_is_loaded();

   215   VM_ENTRY_MARK;

   216   return get_methodOop()->line_number_from_bci(bci);

   217 }

   218 

   219 

   220 // ------------------------------------------------------------------

   221 // ciMethod::vtable_index

   222 //

   223 // Get the position of this method's entry in the vtable, if any.

   224 int ciMethod::vtable_index() {

   225   check_is_loaded();

   226   assert(holder()->is_linked(), "must be linked");

   227   VM_ENTRY_MARK;

   228   return get_methodOop()->vtable_index();

   229 }

   230 

   231 

   232 // ------------------------------------------------------------------

   233 // ciMethod::native_entry

   234 //

   235 // Get the address of this method's native code, if any.

   236 address ciMethod::native_entry() {

   237   check_is_loaded();

   238   assert(flags().is_native(), "must be native method");

   239   VM_ENTRY_MARK;

   240   methodOop method = get_methodOop();

   241   address entry = method->native_function();

   242   assert(entry != NULL, "must be valid entry point");

   243   return entry;

   244 }

   245 

   246 

   247 // ------------------------------------------------------------------

   248 // ciMethod::interpreter_entry

   249 //

   250 // Get the entry point for running this method in the interpreter.

   251 address ciMethod::interpreter_entry() {

   252   check_is_loaded();

   253   VM_ENTRY_MARK;

   254   methodHandle mh(THREAD, get_methodOop());

   255   return Interpreter::entry_for_method(mh);

   256 }

   257 

   258 

   259 // ------------------------------------------------------------------

   260 // ciMethod::uses_balanced_monitors

   261 //

   262 // Does this method use monitors in a strict stack-disciplined manner?

   263 bool ciMethod::has_balanced_monitors() {

   264   check_is_loaded();

   265   if (_balanced_monitors) return true;

   266 

   267   // Analyze the method to see if monitors are used properly.

   268   VM_ENTRY_MARK;

   269   methodHandle method(THREAD, get_methodOop());

   270   assert(method->has_monitor_bytecodes(), "should have checked this");

   271 

   272   // Check to see if a previous compilation computed the

   273   // monitor-matching analysis.

   274   if (method->guaranteed_monitor_matching()) {

   275     _balanced_monitors = true;

   276     return true;

   277   }

   278 

   279   {

   280     EXCEPTION_MARK;

   281     ResourceMark rm(THREAD);

   282     GeneratePairingInfo gpi(method);

   283     gpi.compute_map(CATCH);

   284     if (!gpi.monitor_safe()) {

   285       return false;

   286     }

   287     method->set_guaranteed_monitor_matching();

   288     _balanced_monitors = true;

   289   }

   290   return true;

   291 }

   292 

   293 

   294 // ------------------------------------------------------------------

   295 // ciMethod::get_flow_analysis

   296 ciTypeFlow* ciMethod::get_flow_analysis() {

   297 #ifdef COMPILER2

   298   if (_flow == NULL) {

   299     ciEnv* env = CURRENT_ENV;

   300     _flow = new (env->arena()) ciTypeFlow(env, this);

   301     _flow->do_flow();

   302   }

   303   return _flow;

   304 #else // COMPILER2

   305   ShouldNotReachHere();

   306   return NULL;

   307 #endif // COMPILER2

   308 }

   309 

   310 

   311 // ------------------------------------------------------------------

   312 // ciMethod::get_osr_flow_analysis

   313 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {

   314 #ifdef COMPILER2

   315   // OSR entry points are always place after a call bytecode of some sort

   316   assert(osr_bci >= 0, "must supply valid OSR entry point");

   317   ciEnv* env = CURRENT_ENV;

   318   ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);

   319   flow->do_flow();

   320   return flow;

   321 #else // COMPILER2

   322   ShouldNotReachHere();

   323   return NULL;

   324 #endif // COMPILER2

   325 }

   326 

   327 // ------------------------------------------------------------------

   328 // ciMethod::liveness_at_bci

   329 //

   330 // Which local variables are live at a specific bci?

   331 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {

   332   check_is_loaded();

   333   if (_liveness == NULL) {

   334     // Create the liveness analyzer.

   335     Arena* arena = CURRENT_ENV->arena();

   336     _liveness = new (arena) MethodLiveness(arena, this);

   337     _liveness->compute_liveness();

   338   }

   339   MethodLivenessResult result = _liveness->get_liveness_at(bci);

   340   if (JvmtiExport::can_access_local_variables() || DeoptimizeALot || CompileTheWorld) {

   341     // Keep all locals live for the user's edification and amusement.

   342     result.at_put_range(0, result.size(), true);

   343   }

   344   return result;

   345 }

   346 

   347 // ciMethod::live_local_oops_at_bci

   348 //

   349 // find all the live oops in the locals array for a particular bci

   350 // Compute what the interpreter believes by using the interpreter

   351 // oopmap generator. This is used as a double check during osr to

   352 // guard against conservative result from MethodLiveness making us

   353 // think a dead oop is live.  MethodLiveness is conservative in the

   354 // sense that it may consider locals to be live which cannot be live,

   355 // like in the case where a local could contain an oop or  a primitive

   356 // along different paths.  In that case the local must be dead when

   357 // those paths merge. Since the interpreter's viewpoint is used when

   358 // gc'ing an interpreter frame we need to use its viewpoint  during

   359 // OSR when loading the locals.

   360 

   361 BitMap ciMethod::live_local_oops_at_bci(int bci) {

   362   VM_ENTRY_MARK;

   363   InterpreterOopMap mask;

   364   OopMapCache::compute_one_oop_map(get_methodOop(), bci, &mask);

   365   int mask_size = max_locals();

   366   BitMap result(mask_size);

   367   result.clear();

   368   int i;

   369   for (i = 0; i < mask_size ; i++ ) {

   370     if (mask.is_oop(i)) result.set_bit(i);

   371   }

   372   return result;

   373 }

   374 

   375 

   376 #ifdef COMPILER1

   377 // ------------------------------------------------------------------

   378 // ciMethod::bci_block_start

   379 //

   380 // Marks all bcis where a new basic block starts

   381 const BitMap ciMethod::bci_block_start() {

   382   check_is_loaded();

   383   if (_liveness == NULL) {

   384     // Create the liveness analyzer.

   385     Arena* arena = CURRENT_ENV->arena();

   386     _liveness = new (arena) MethodLiveness(arena, this);

   387     _liveness->compute_liveness();

   388   }

   389 

   390   return _liveness->get_bci_block_start();

   391 }

   392 #endif // COMPILER1

   393 

   394 

   395 // ------------------------------------------------------------------

   396 // ciMethod::call_profile_at_bci

   397 //

   398 // Get the ciCallProfile for the invocation of this method.

   399 // Also reports receiver types for non-call type checks (if TypeProfileCasts).

   400 ciCallProfile ciMethod::call_profile_at_bci(int bci) {

   401   ResourceMark rm;

   402   ciCallProfile result;

   403   if (method_data() != NULL && method_data()->is_mature()) {

   404     ciProfileData* data = method_data()->bci_to_data(bci);

   405     if (data != NULL && data->is_CounterData()) {

   406       // Every profiled call site has a counter.

   407       int count = data->as_CounterData()->count();

   408 

   409       if (!data->is_ReceiverTypeData()) {

   410         result._receiver_count[0] = 0;  // that's a definite zero

   411       } else { // ReceiverTypeData is a subclass of CounterData

   412         ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();

   413         // In addition, virtual call sites have receiver type information

   414         int receivers_count_total = 0;

   415         int morphism = 0;

   416         for (uint i = 0; i < call->row_limit(); i++) {

   417           ciKlass* receiver = call->receiver(i);

   418           if (receiver == NULL)  continue;

   419           morphism += 1;

   420           int rcount = call->receiver_count(i);

   421           if (rcount == 0) rcount = 1; // Should be valid value

   422           receivers_count_total += rcount;

   423           // Add the receiver to result data.

   424           result.add_receiver(receiver, rcount);

   425           // If we extend profiling to record methods,

   426           // we will set result._method also.

   427         }

   428         // Determine call site's morphism.

   429         // The call site count could be == (receivers_count_total + 1)

   430         // not only in the case of a polymorphic call but also in the case

   431         // when a method data snapshot is taken after the site count was updated

   432         // but before receivers counters were updated.

   433         if (morphism == result._limit) {

   434            // There were no array klasses and morphism <= MorphismLimit.

   435            if (morphism <  ciCallProfile::MorphismLimit ||

   436                morphism == ciCallProfile::MorphismLimit &&

   437                (receivers_count_total+1) >= count) {

   438              result._morphism = morphism;

   439            }

   440         }

   441         // Make the count consistent if this is a call profile. If count is

   442         // zero or less, presume that this is a typecheck profile and

   443         // do nothing.  Otherwise, increase count to be the sum of all

   444         // receiver's counts.

   445         if (count > 0) {

   446           if (count < receivers_count_total) {

   447             count = receivers_count_total;

   448           }

   449         }

   450       }

   451       result._count = count;

   452     }

   453   }

   454   return result;

   455 }

   456 

   457 // ------------------------------------------------------------------

   458 // Add new receiver and sort data by receiver's profile count.

   459 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {

   460   // Add new receiver and sort data by receiver's counts when we have space

   461   // for it otherwise replace the less called receiver (less called receiver

   462   // is placed to the last array element which is not used).

   463   // First array's element contains most called receiver.

   464   int i = _limit;

   465   for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {

   466     _receiver[i] = _receiver[i-1];

   467     _receiver_count[i] = _receiver_count[i-1];

   468   }

   469   _receiver[i] = receiver;

   470   _receiver_count[i] = receiver_count;

   471   if (_limit < MorphismLimit) _limit++;

   472 }

   473 

   474 // ------------------------------------------------------------------

   475 // ciMethod::find_monomorphic_target

   476 //

   477 // Given a certain calling environment, find the monomorphic target

   478 // for the call.  Return NULL if the call is not monomorphic in

   479 // its calling environment, or if there are only abstract methods.

   480 // The returned method is never abstract.

   481 // Note: If caller uses a non-null result, it must inform dependencies

   482 // via assert_unique_concrete_method or assert_leaf_type.

   483 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,

   484                                             ciInstanceKlass* callee_holder,

   485                                             ciInstanceKlass* actual_recv) {

   486   check_is_loaded();

   487 

   488   if (actual_recv->is_interface()) {

   489     // %%% We cannot trust interface types, yet.  See bug 6312651.

   490     return NULL;

   491   }

   492 

   493   ciMethod* root_m = resolve_invoke(caller, actual_recv);

   494   if (root_m == NULL) {

   495     // Something went wrong looking up the actual receiver method.

   496     return NULL;

   497   }

   498   assert(!root_m->is_abstract(), "resolve_invoke promise");

   499 

   500   // Make certain quick checks even if UseCHA is false.

   501 

   502   // Is it private or final?

   503   if (root_m->can_be_statically_bound()) {

   504     return root_m;

   505   }

   506 

   507   if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {

   508     // Easy case.  There is no other place to put a method, so don't bother

   509     // to go through the VM_ENTRY_MARK and all the rest.

   510     return root_m;

   511   }

   512 

   513   // Array methods (clone, hashCode, etc.) are always statically bound.

   514   // If we were to see an array type here, we'd return root_m.

   515   // However, this method processes only ciInstanceKlasses.  (See 4962591.)

   516   // The inline_native_clone intrinsic narrows Object to T[] properly,

   517   // so there is no need to do the same job here.

   518 

   519   if (!UseCHA)  return NULL;

   520 

   521   VM_ENTRY_MARK;

   522 

   523   methodHandle target;

   524   {

   525     MutexLocker locker(Compile_lock);

   526     klassOop context = actual_recv->get_klassOop();

   527     target = Dependencies::find_unique_concrete_method(context,

   528                                                        root_m->get_methodOop());

   529     // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.

   530   }

   531 

   532 #ifndef PRODUCT

   533   if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) {

   534     tty->print("found a non-root unique target method");

   535     tty->print_cr("  context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name());

   536     tty->print("  method  = ");

   537     target->print_short_name(tty);

   538     tty->cr();

   539   }

   540 #endif //PRODUCT

   541 

   542   if (target() == NULL) {

   543     return NULL;

   544   }

   545   if (target() == root_m->get_methodOop()) {

   546     return root_m;

   547   }

   548   if (!root_m->is_public() &&

   549       !root_m->is_protected()) {

   550     // If we are going to reason about inheritance, it's easiest

   551     // if the method in question is public, protected, or private.

   552     // If the answer is not root_m, it is conservatively correct

   553     // to return NULL, even if the CHA encountered irrelevant

   554     // methods in other packages.

   555     // %%% TO DO: Work out logic for package-private methods

   556     // with the same name but different vtable indexes.

   557     return NULL;

   558   }

   559   return CURRENT_THREAD_ENV->get_object(target())->as_method();

   560 }

   561 

   562 // ------------------------------------------------------------------

   563 // ciMethod::resolve_invoke

   564 //

   565 // Given a known receiver klass, find the target for the call.

   566 // Return NULL if the call has no target or the target is abstract.

   567 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) {

   568    check_is_loaded();

   569    VM_ENTRY_MARK;

   570 

   571    KlassHandle caller_klass (THREAD, caller->get_klassOop());

   572    KlassHandle h_recv       (THREAD, exact_receiver->get_klassOop());

   573    KlassHandle h_resolved   (THREAD, holder()->get_klassOop());

   574    symbolHandle h_name      (THREAD, name()->get_symbolOop());

   575    symbolHandle h_signature (THREAD, signature()->get_symbolOop());

   576 

   577    methodHandle m;

   578    // Only do exact lookup if receiver klass has been linked.  Otherwise,

   579    // the vtable has not been setup, and the LinkResolver will fail.

   580    if (h_recv->oop_is_javaArray()

   581         ||

   582        instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) {

   583      if (holder()->is_interface()) {

   584        m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);

   585      } else {

   586        m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass);

   587      }

   588    }

   589 

   590    if (m.is_null()) {

   591      // Return NULL only if there was a problem with lookup (uninitialized class, etc.)

   592      return NULL;

   593    }

   594 

   595    ciMethod* result = this;

   596    if (m() != get_methodOop()) {

   597      result = CURRENT_THREAD_ENV->get_object(m())->as_method();

   598    }

   599 

   600    // Don't return abstract methods because they aren't

   601    // optimizable or interesting.

   602    if (result->is_abstract()) {

   603      return NULL;

   604    } else {

   605      return result;

   606    }

   607 }

   608 

   609 // ------------------------------------------------------------------

   610 // ciMethod::resolve_vtable_index

   611 //

   612 // Given a known receiver klass, find the vtable index for the call.

   613 // Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown.

   614 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {

   615    check_is_loaded();

   616 

   617    int vtable_index = methodOopDesc::invalid_vtable_index;

   618    // Only do lookup if receiver klass has been linked.  Otherwise,

   619    // the vtable has not been setup, and the LinkResolver will fail.

   620    if (!receiver->is_interface()

   621        && (!receiver->is_instance_klass() ||

   622            receiver->as_instance_klass()->is_linked())) {

   623      VM_ENTRY_MARK;

   624 

   625      KlassHandle caller_klass (THREAD, caller->get_klassOop());

   626      KlassHandle h_recv       (THREAD, receiver->get_klassOop());

   627      symbolHandle h_name      (THREAD, name()->get_symbolOop());

   628      symbolHandle h_signature (THREAD, signature()->get_symbolOop());

   629 

   630      vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass);

   631      if (vtable_index == methodOopDesc::nonvirtual_vtable_index) {

   632        // A statically bound method.  Return "no such index".

   633        vtable_index = methodOopDesc::invalid_vtable_index;

   634      }

   635    }

   636 

   637    return vtable_index;

   638 }

   639 

   640 // ------------------------------------------------------------------

   641 // ciMethod::interpreter_call_site_count

   642 int ciMethod::interpreter_call_site_count(int bci) {

   643   if (method_data() != NULL) {

   644     ResourceMark rm;

   645     ciProfileData* data = method_data()->bci_to_data(bci);

   646     if (data != NULL && data->is_CounterData()) {

   647       return scale_count(data->as_CounterData()->count());

   648     }

   649   }

   650   return -1;  // unknown

   651 }

   652 

   653 // ------------------------------------------------------------------

   654 // Adjust a CounterData count to be commensurate with

   655 // interpreter_invocation_count.  If the MDO exists for

   656 // only 25% of the time the method exists, then the

   657 // counts in the MDO should be scaled by 4X, so that

   658 // they can be usefully and stably compared against the

   659 // invocation counts in methods.

   660 int ciMethod::scale_count(int count, float prof_factor) {

   661   if (count > 0 && method_data() != NULL) {

   662     int current_mileage = method_data()->current_mileage();

   663     int creation_mileage = method_data()->creation_mileage();

   664     int counter_life = current_mileage - creation_mileage;

   665     int method_life = interpreter_invocation_count();

   666     // counter_life due to backedge_counter could be > method_life

   667     if (counter_life > method_life)

   668       counter_life = method_life;

   669     if (0 < counter_life && counter_life <= method_life) {

   670       count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);

   671       count = (count > 0) ? count : 1;

   672     }

   673   }

   674   return count;

   675 }

   676 

   677 // ------------------------------------------------------------------

   678 // ciMethod::build_method_data

   679 //

   680 // Generate new methodDataOop objects at compile time.

   681 void ciMethod::build_method_data(methodHandle h_m) {

   682   EXCEPTION_CONTEXT;

   683   if (is_native() || is_abstract() || h_m()->is_accessor()) return;

   684   if (h_m()->method_data() == NULL) {

   685     methodOopDesc::build_interpreter_method_data(h_m, THREAD);

   686     if (HAS_PENDING_EXCEPTION) {

   687       CLEAR_PENDING_EXCEPTION;

   688     }

   689   }

   690   if (h_m()->method_data() != NULL) {

   691     _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();

   692     _method_data->load_data();

   693   } else {

   694     _method_data = CURRENT_ENV->get_empty_methodData();

   695   }

   696 }

   697 

   698 // public, retroactive version

   699 void ciMethod::build_method_data() {

   700   if (_method_data == NULL || _method_data->is_empty()) {

   701     GUARDED_VM_ENTRY({

   702       build_method_data(get_methodOop());

   703     });

   704   }

   705 }

   706 

   707 

   708 // ------------------------------------------------------------------

   709 // ciMethod::method_data

   710 //

   711 ciMethodData* ciMethod::method_data() {

   712   if (_method_data != NULL) {

   713     return _method_data;

   714   }

   715   VM_ENTRY_MARK;

   716   ciEnv* env = CURRENT_ENV;

   717   Thread* my_thread = JavaThread::current();

   718   methodHandle h_m(my_thread, get_methodOop());

   719 

   720   if (Tier1UpdateMethodData && is_tier1_compile(env->comp_level())) {

   721     build_method_data(h_m);

   722   }

   723 

   724   if (h_m()->method_data() != NULL) {

   725     _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data();

   726     _method_data->load_data();

   727   } else {

   728     _method_data = CURRENT_ENV->get_empty_methodData();

   729   }

   730   return _method_data;

   731 

   732 }

   733 

   734 

   735 // ------------------------------------------------------------------

   736 // ciMethod::will_link

   737 //

   738 // Will this method link in a specific calling context?

   739 bool ciMethod::will_link(ciKlass* accessing_klass,

   740                          ciKlass* declared_method_holder,

   741                          Bytecodes::Code bc) {

   742   if (!is_loaded()) {

   743     // Method lookup failed.

   744     return false;

   745   }

   746 

   747   // The link checks have been front-loaded into the get_method

   748   // call.  This method (ciMethod::will_link()) will be removed

   749   // in the future.

   750 

   751   return true;

   752 }

   753 

   754 // ------------------------------------------------------------------

   755 // ciMethod::should_exclude

   756 //

   757 // Should this method be excluded from compilation?

   758 bool ciMethod::should_exclude() {

   759   check_is_loaded();

   760   VM_ENTRY_MARK;

   761   methodHandle mh(THREAD, get_methodOop());

   762   bool ignore;

   763   return CompilerOracle::should_exclude(mh, ignore);

   764 }

   765 

   766 // ------------------------------------------------------------------

   767 // ciMethod::should_inline

   768 //

   769 // Should this method be inlined during compilation?

   770 bool ciMethod::should_inline() {

   771   check_is_loaded();

   772   VM_ENTRY_MARK;

   773   methodHandle mh(THREAD, get_methodOop());

   774   return CompilerOracle::should_inline(mh);

   775 }

   776 

   777 // ------------------------------------------------------------------

   778 // ciMethod::should_not_inline

   779 //

   780 // Should this method be disallowed from inlining during compilation?

   781 bool ciMethod::should_not_inline() {

   782   check_is_loaded();

   783   VM_ENTRY_MARK;

   784   methodHandle mh(THREAD, get_methodOop());

   785   return CompilerOracle::should_not_inline(mh);

   786 }

   787 

   788 // ------------------------------------------------------------------

   789 // ciMethod::should_print_assembly

   790 //

   791 // Should the compiler print the generated code for this method?

   792 bool ciMethod::should_print_assembly() {

   793   check_is_loaded();

   794   VM_ENTRY_MARK;

   795   methodHandle mh(THREAD, get_methodOop());

   796   return CompilerOracle::should_print(mh);

   797 }

   798 

   799 // ------------------------------------------------------------------

   800 // ciMethod::break_at_execute

   801 //

   802 // Should the compiler insert a breakpoint into the generated code

   803 // method?

   804 bool ciMethod::break_at_execute() {

   805   check_is_loaded();

   806   VM_ENTRY_MARK;

   807   methodHandle mh(THREAD, get_methodOop());

   808   return CompilerOracle::should_break_at(mh);

   809 }

   810 

   811 // ------------------------------------------------------------------

   812 // ciMethod::has_option

   813 //

   814 bool ciMethod::has_option(const char* option) {

   815   check_is_loaded();

   816   VM_ENTRY_MARK;

   817   methodHandle mh(THREAD, get_methodOop());

   818   return CompilerOracle::has_option_string(mh, option);

   819 }

   820 

   821 // ------------------------------------------------------------------

   822 // ciMethod::can_be_compiled

   823 //

   824 // Have previous compilations of this method succeeded?

   825 bool ciMethod::can_be_compiled() {

   826   check_is_loaded();

   827   return _is_compilable;

   828 }

   829 

   830 // ------------------------------------------------------------------

   831 // ciMethod::set_not_compilable

   832 //

   833 // Tell the VM that this method cannot be compiled at all.

   834 void ciMethod::set_not_compilable() {

   835   check_is_loaded();

   836   VM_ENTRY_MARK;

   837   _is_compilable = false;

   838   get_methodOop()->set_not_compilable();

   839 }

   840 

   841 // ------------------------------------------------------------------

   842 // ciMethod::can_be_osr_compiled

   843 //

   844 // Have previous compilations of this method succeeded?

   845 //

   846 // Implementation note: the VM does not currently keep track

   847 // of failed OSR compilations per bci.  The entry_bci parameter

   848 // is currently unused.

   849 bool ciMethod::can_be_osr_compiled(int entry_bci) {

   850   check_is_loaded();

   851   VM_ENTRY_MARK;

   852   return !get_methodOop()->access_flags().is_not_osr_compilable();

   853 }

   854 

   855 // ------------------------------------------------------------------

   856 // ciMethod::has_compiled_code

   857 bool ciMethod::has_compiled_code() {

   858   VM_ENTRY_MARK;

   859   return get_methodOop()->code() != NULL;

   860 }

   861 

   862 // ------------------------------------------------------------------

   863 // ciMethod::instructions_size

   864 // This is a rough metric for "fat" methods, compared

   865 // before inlining with InlineSmallCode.

   866 // The CodeBlob::instructions_size accessor includes

   867 // junk like exception handler, stubs, and constant table,

   868 // which are not highly relevant to an inlined method.

   869 // So we use the more specific accessor nmethod::code_size.

   870 int ciMethod::instructions_size() {

   871   GUARDED_VM_ENTRY(

   872     nmethod* code = get_methodOop()->code();

   873     // if there's no compiled code or the code was produced by the

   874     // tier1 profiler return 0 for the code size.  This should

   875     // probably be based on the compilation level of the nmethod but

   876     // that currently isn't properly recorded.

   877     if (code == NULL ||

   878         (TieredCompilation && code->compiler() != NULL && code->compiler()->is_c1())) {

   879       return 0;

   880     }

   881     return code->code_size();

   882   )

   883 }

   884 

   885 // ------------------------------------------------------------------

   886 // ciMethod::log_nmethod_identity

   887 void ciMethod::log_nmethod_identity(xmlStream* log) {

   888   GUARDED_VM_ENTRY(

   889     nmethod* code = get_methodOop()->code();

   890     if (code != NULL) {

   891       code->log_identity(log);

   892     }

   893   )

   894 }

   895 

   896 // ------------------------------------------------------------------

   897 // ciMethod::is_not_reached

   898 bool ciMethod::is_not_reached(int bci) {

   899   check_is_loaded();

   900   VM_ENTRY_MARK;

   901   return Interpreter::is_not_reached(

   902                methodHandle(THREAD, get_methodOop()), bci);

   903 }

   904 

   905 // ------------------------------------------------------------------

   906 // ciMethod::was_never_executed

   907 bool ciMethod::was_executed_more_than(int times) {

   908   VM_ENTRY_MARK;

   909   return get_methodOop()->was_executed_more_than(times);

   910 }

   911 

   912 // ------------------------------------------------------------------

   913 // ciMethod::has_unloaded_classes_in_signature

   914 bool ciMethod::has_unloaded_classes_in_signature() {

   915   VM_ENTRY_MARK;

   916   {

   917     EXCEPTION_MARK;

   918     methodHandle m(THREAD, get_methodOop());

   919     bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);

   920     if( HAS_PENDING_EXCEPTION ) {

   921       CLEAR_PENDING_EXCEPTION;

   922       return true;     // Declare that we may have unloaded classes

   923     }

   924     return has_unloaded;

   925   }

   926 }

   927 

   928 // ------------------------------------------------------------------

   929 // ciMethod::is_klass_loaded

   930 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {

   931   VM_ENTRY_MARK;

   932   return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved);

   933 }

   934 

   935 // ------------------------------------------------------------------

   936 // ciMethod::check_call

   937 bool ciMethod::check_call(int refinfo_index, bool is_static) const {

   938   VM_ENTRY_MARK;

   939   {

   940     EXCEPTION_MARK;

   941     HandleMark hm(THREAD);

   942     constantPoolHandle pool (THREAD, get_methodOop()->constants());

   943     methodHandle spec_method;

   944     KlassHandle  spec_klass;

   945     LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD);

   946     if (HAS_PENDING_EXCEPTION) {

   947       CLEAR_PENDING_EXCEPTION;

   948       return false;

   949     } else {

   950       return (spec_method->is_static() == is_static);

   951     }

   952   }

   953   return false;

   954 }

   955 

   956 // ------------------------------------------------------------------

   957 // ciMethod::print_codes

   958 //

   959 // Print the bytecodes for this method.

   960 void ciMethod::print_codes_on(outputStream* st) {

   961   check_is_loaded();

   962   GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);)

   963 }

   964 

   965 

   966 #define FETCH_FLAG_FROM_VM(flag_accessor) { \

   967   check_is_loaded(); \

   968   VM_ENTRY_MARK; \

   969   return get_methodOop()->flag_accessor(); \

   970 }

   971 

   972 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }

   973 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }

   974 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }

   975 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }

   976 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }

   977 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }

   978 

   979 BCEscapeAnalyzer  *ciMethod::get_bcea() {

   980   if (_bcea == NULL) {

   981     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);

   982   }

   983   return _bcea;

   984 }

   985 

   986 ciMethodBlocks  *ciMethod::get_method_blocks() {

   987   Arena *arena = CURRENT_ENV->arena();

   988   if (_method_blocks == NULL) {

   989     _method_blocks = new (arena) ciMethodBlocks(arena, this);

   990   }

   991   return _method_blocks;

   992 }

   993 

   994 #undef FETCH_FLAG_FROM_VM

   995 

   996 

   997 // ------------------------------------------------------------------

   998 // ciMethod::print_codes

   999 //

  1000 // Print a range of the bytecodes for this method.

  1001 void ciMethod::print_codes_on(int from, int to, outputStream* st) {

  1002   check_is_loaded();

  1003   GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);)

  1004 }

  1005 

  1006 // ------------------------------------------------------------------

  1007 // ciMethod::print_name

  1008 //

  1009 // Print the name of this method, including signature and some flags.

  1010 void ciMethod::print_name(outputStream* st) {

  1011   check_is_loaded();

  1012   GUARDED_VM_ENTRY(get_methodOop()->print_name(st);)

  1013 }

  1014 

  1015 // ------------------------------------------------------------------

  1016 // ciMethod::print_short_name

  1017 //

  1018 // Print the name of this method, without signature.

  1019 void ciMethod::print_short_name(outputStream* st) {

  1020   check_is_loaded();

  1021   GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);)

  1022 }

  1023 

  1024 // ------------------------------------------------------------------

  1025 // ciMethod::print_impl

  1026 //

  1027 // Implementation of the print method.

  1028 void ciMethod::print_impl(outputStream* st) {

  1029   ciObject::print_impl(st);

  1030   st->print(" name=");

  1031   name()->print_symbol_on(st);

  1032   st->print(" holder=");

  1033   holder()->print_name_on(st);

  1034   st->print(" signature=");

  1035   signature()->as_symbol()->print_symbol_on(st);

  1036   if (is_loaded()) {

  1037     st->print(" loaded=true flags=");

  1038     flags().print_member_flags(st);

  1039   } else {

  1040     st->print(" loaded=false");

  1041   }

  1042 }