jdk8-mips64-public/hotspot: src/share/vm/ci/ciMethod.cpp@4ce7240d622c

     1 /*

     2  * Copyright 1999-2009 Sun Microsystems, Inc.  All Rights Reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

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

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

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_ciMethod.cpp.incl"

    28 // ciMethod

    29 //

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

    31 // machine.

    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");

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

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

    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

    63   ciEnv *env = CURRENT_ENV;

    64   if (env->jvmti_can_hotswap_or_post_breakpoint() && _is_compilable) {

    65     // 6328518 check hotswap conditions under the right lock.

    66     MutexLocker locker(Compile_lock);

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

    68       _is_compilable = false;

    69     }

    70   } else {

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

    72   }

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

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

    76   } else {

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

    78     _can_be_statically_bound = false;

    79   }

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

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

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

    84     _can_be_statically_bound = true;

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

    86     _can_be_statically_bound = false;

    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 }

   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 }

   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");

   141   methodOop me = get_methodOop();

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

   144   // Load the bytecodes.

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

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

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

   149   if (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   }

   158   // And load the exception table.

   159   typeArrayOop exc_table = me->exception_table();

   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   }

   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);

   185   if (CIPrintMethodCodes) {

   186     print_codes();

   187   }

   188 }

   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 }

   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 }

   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 }

   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 }

   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 }

   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 }

   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;

   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");

   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   }

   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 }

   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 }

   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 }

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

   328 // ciMethod::raw_liveness_at_bci

   329 //

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

   331 MethodLivenessResult ciMethod::raw_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   return _liveness->get_liveness_at(bci);

   340 }

   342 // ------------------------------------------------------------------

   343 // ciMethod::liveness_at_bci

   344 //

   345 // Which local variables are live at a specific bci?  When debugging

   346 // will return true for all locals in some cases to improve debug

   347 // information.

   348 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {

   349   MethodLivenessResult result = raw_liveness_at_bci(bci);

   350   if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) {

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

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

   353   }

   354   return result;

   355 }

   357 // ciMethod::live_local_oops_at_bci

   358 //

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

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

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

   362 // guard against conservative result from MethodLiveness making us

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

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

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

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

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

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

   369 // OSR when loading the locals.

   371 BitMap ciMethod::live_local_oops_at_bci(int bci) {

   372   VM_ENTRY_MARK;

   373   InterpreterOopMap mask;

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

   375   int mask_size = max_locals();

   376   BitMap result(mask_size);

   377   result.clear();

   378   int i;

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

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

   381   }

   382   return result;

   383 }

   386 #ifdef COMPILER1

   387 // ------------------------------------------------------------------

   388 // ciMethod::bci_block_start

   389 //

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

   391 const BitMap ciMethod::bci_block_start() {

   392   check_is_loaded();

   393   if (_liveness == NULL) {

   394     // Create the liveness analyzer.

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

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

   397     _liveness->compute_liveness();

   398   }

   400   return _liveness->get_bci_block_start();

   401 }

   402 #endif // COMPILER1

   405 // ------------------------------------------------------------------

   406 // ciMethod::call_profile_at_bci

   407 //

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

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

   410 ciCallProfile ciMethod::call_profile_at_bci(int bci) {

   411   ResourceMark rm;

   412   ciCallProfile result;

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

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

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

   416       // Every profiled call site has a counter.

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

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

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

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

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

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

   424         int receivers_count_total = 0;

   425         int morphism = 0;

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

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

   428           if (receiver == NULL)  continue;

   429           morphism += 1;

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

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

   432           receivers_count_total += rcount;

   433           // Add the receiver to result data.

   434           result.add_receiver(receiver, rcount);

   435           // If we extend profiling to record methods,

   436           // we will set result._method also.

   437         }

   438         // Determine call site's morphism.

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

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

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

   442         // but before receivers counters were updated.

   443         if (morphism == result._limit) {

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

   445            if (morphism <  ciCallProfile::MorphismLimit ||

   446                morphism == ciCallProfile::MorphismLimit &&

   447                (receivers_count_total+1) >= count) {

   448              result._morphism = morphism;

   449            }

   450         }

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

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

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

   454         // receiver's counts.

   455         if (count > 0) {

   456           if (count < receivers_count_total) {

   457             count = receivers_count_total;

   458           }

   459         }

   460       }

   461       result._count = count;

   462     }

   463   }

   464   return result;

   465 }

   467 // ------------------------------------------------------------------

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

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

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

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

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

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

   474   int i = _limit;

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

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

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

   478   }

   479   _receiver[i] = receiver;

   480   _receiver_count[i] = receiver_count;

   481   if (_limit < MorphismLimit) _limit++;

   482 }

   484 // ------------------------------------------------------------------

   485 // ciMethod::find_monomorphic_target

   486 //

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

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

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

   490 // The returned method is never abstract.

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

   492 // via assert_unique_concrete_method or assert_leaf_type.

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

   494                                             ciInstanceKlass* callee_holder,

   495                                             ciInstanceKlass* actual_recv) {

   496   check_is_loaded();

   498   if (actual_recv->is_interface()) {

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

   500     return NULL;

   501   }

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

   504   if (root_m == NULL) {

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

   506     return NULL;

   507   }

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

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

   512   // Is it private or final?

   513   if (root_m->can_be_statically_bound()) {

   514     return root_m;

   515   }

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

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

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

   520     return root_m;

   521   }

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

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

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

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

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

   529   if (!UseCHA)  return NULL;

   531   VM_ENTRY_MARK;

   533   methodHandle target;

   534   {

   535     MutexLocker locker(Compile_lock);

   536     klassOop context = actual_recv->get_klassOop();

   537     target = Dependencies::find_unique_concrete_method(context,

   538                                                        root_m->get_methodOop());

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

   540   }

   542 #ifndef PRODUCT

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

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

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

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

   547     target->print_short_name(tty);

   548     tty->cr();

   549   }

   550 #endif //PRODUCT

   552   if (target() == NULL) {

   553     return NULL;

   554   }

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

   556     return root_m;

   557   }

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

   559       !root_m->is_protected()) {

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

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

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

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

   564     // methods in other packages.

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

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

   567     return NULL;

   568   }

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

   570 }

   572 // ------------------------------------------------------------------

   573 // ciMethod::resolve_invoke

   574 //

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

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

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

   578    check_is_loaded();

   579    VM_ENTRY_MARK;

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

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

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

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

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

   587    methodHandle m;

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

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

   590    if (h_recv->oop_is_javaArray()

   591         ||

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

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

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

   595      } else {

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

   597      }

   598    }

   600    if (m.is_null()) {

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

   602      return NULL;

   603    }

   605    ciMethod* result = this;

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

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

   608    }

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

   611    // optimizable or interesting.

   612    if (result->is_abstract()) {

   613      return NULL;

   614    } else {

   615      return result;

   616    }

   617 }

   619 // ------------------------------------------------------------------

   620 // ciMethod::resolve_vtable_index

   621 //

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

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

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

   625    check_is_loaded();

   627    int vtable_index = methodOopDesc::invalid_vtable_index;

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

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

   630    if (!receiver->is_interface()

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

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

   633      VM_ENTRY_MARK;

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

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

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

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

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

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

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

   643        vtable_index = methodOopDesc::invalid_vtable_index;

   644      }

   645    }

   647    return vtable_index;

   648 }

   650 // ------------------------------------------------------------------

   651 // ciMethod::interpreter_call_site_count

   652 int ciMethod::interpreter_call_site_count(int bci) {

   653   if (method_data() != NULL) {

   654     ResourceMark rm;

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

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

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

   658     }

   659   }

   660   return -1;  // unknown

   661 }

   663 // ------------------------------------------------------------------

   664 // Adjust a CounterData count to be commensurate with

   665 // interpreter_invocation_count.  If the MDO exists for

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

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

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

   669 // invocation counts in methods.

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

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

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

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

   674     int counter_life = current_mileage - creation_mileage;

   675     int method_life = interpreter_invocation_count();

   676     // counter_life due to backedge_counter could be > method_life

   677     if (counter_life > method_life)

   678       counter_life = method_life;

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

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

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

   682     }

   683   }

   684   return count;

   685 }

   687 // ------------------------------------------------------------------

   688 // invokedynamic support

   689 //

   690 bool ciMethod::is_method_handle_invoke() const {

   691   check_is_loaded();

   692   bool flag = ((flags().as_int() & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS);

   693 #ifdef ASSERT

   694   {

   695     VM_ENTRY_MARK;

   696     bool flag2 = get_methodOop()->is_method_handle_invoke();

   697     assert(flag == flag2, "consistent");

   698   }

   699 #endif //ASSERT

   700   return flag;

   701 }

   703 ciInstance* ciMethod::method_handle_type() {

   704   check_is_loaded();

   705   VM_ENTRY_MARK;

   706   oop mtype = get_methodOop()->method_handle_type();

   707   return CURRENT_THREAD_ENV->get_object(mtype)->as_instance();

   708 }

   711 // ------------------------------------------------------------------

   712 // ciMethod::build_method_data

   713 //

   714 // Generate new methodDataOop objects at compile time.

   715 void ciMethod::build_method_data(methodHandle h_m) {

   716   EXCEPTION_CONTEXT;

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

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

   719     methodOopDesc::build_interpreter_method_data(h_m, THREAD);

   720     if (HAS_PENDING_EXCEPTION) {

   721       CLEAR_PENDING_EXCEPTION;

   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 }

   732 // public, retroactive version

   733 void ciMethod::build_method_data() {

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

   735     GUARDED_VM_ENTRY({

   736       build_method_data(get_methodOop());

   737     });

   738   }

   739 }

   742 // ------------------------------------------------------------------

   743 // ciMethod::method_data

   744 //

   745 ciMethodData* ciMethod::method_data() {

   746   if (_method_data != NULL) {

   747     return _method_data;

   748   }

   749   VM_ENTRY_MARK;

   750   ciEnv* env = CURRENT_ENV;

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

   752   methodHandle h_m(my_thread, get_methodOop());

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

   755     build_method_data(h_m);

   756   }

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

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

   760     _method_data->load_data();

   761   } else {

   762     _method_data = CURRENT_ENV->get_empty_methodData();

   763   }

   764   return _method_data;

   766 }

   769 // ------------------------------------------------------------------

   770 // ciMethod::will_link

   771 //

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

   773 bool ciMethod::will_link(ciKlass* accessing_klass,

   774                          ciKlass* declared_method_holder,

   775                          Bytecodes::Code bc) {

   776   if (!is_loaded()) {

   777     // Method lookup failed.

   778     return false;

   779   }

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

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

   783   // in the future.

   785   return true;

   786 }

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

   789 // ciMethod::should_exclude

   790 //

   791 // Should this method be excluded from compilation?

   792 bool ciMethod::should_exclude() {

   793   check_is_loaded();

   794   VM_ENTRY_MARK;

   795   methodHandle mh(THREAD, get_methodOop());

   796   bool ignore;

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

   798 }

   800 // ------------------------------------------------------------------

   801 // ciMethod::should_inline

   802 //

   803 // Should this method be inlined during compilation?

   804 bool ciMethod::should_inline() {

   805   check_is_loaded();

   806   VM_ENTRY_MARK;

   807   methodHandle mh(THREAD, get_methodOop());

   808   return CompilerOracle::should_inline(mh);

   809 }

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

   812 // ciMethod::should_not_inline

   813 //

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

   815 bool ciMethod::should_not_inline() {

   816   check_is_loaded();

   817   VM_ENTRY_MARK;

   818   methodHandle mh(THREAD, get_methodOop());

   819   return CompilerOracle::should_not_inline(mh);

   820 }

   822 // ------------------------------------------------------------------

   823 // ciMethod::should_print_assembly

   824 //

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

   826 bool ciMethod::should_print_assembly() {

   827   check_is_loaded();

   828   VM_ENTRY_MARK;

   829   methodHandle mh(THREAD, get_methodOop());

   830   return CompilerOracle::should_print(mh);

   831 }

   833 // ------------------------------------------------------------------

   834 // ciMethod::break_at_execute

   835 //

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

   837 // method?

   838 bool ciMethod::break_at_execute() {

   839   check_is_loaded();

   840   VM_ENTRY_MARK;

   841   methodHandle mh(THREAD, get_methodOop());

   842   return CompilerOracle::should_break_at(mh);

   843 }

   845 // ------------------------------------------------------------------

   846 // ciMethod::has_option

   847 //

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

   849   check_is_loaded();

   850   VM_ENTRY_MARK;

   851   methodHandle mh(THREAD, get_methodOop());

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

   853 }

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

   856 // ciMethod::can_be_compiled

   857 //

   858 // Have previous compilations of this method succeeded?

   859 bool ciMethod::can_be_compiled() {

   860   check_is_loaded();

   861   return _is_compilable;

   862 }

   864 // ------------------------------------------------------------------

   865 // ciMethod::set_not_compilable

   866 //

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

   868 void ciMethod::set_not_compilable() {

   869   check_is_loaded();

   870   VM_ENTRY_MARK;

   871   _is_compilable = false;

   872   get_methodOop()->set_not_compilable();

   873 }

   875 // ------------------------------------------------------------------

   876 // ciMethod::can_be_osr_compiled

   877 //

   878 // Have previous compilations of this method succeeded?

   879 //

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

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

   882 // is currently unused.

   883 bool ciMethod::can_be_osr_compiled(int entry_bci) {

   884   check_is_loaded();

   885   VM_ENTRY_MARK;

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

   887 }

   889 // ------------------------------------------------------------------

   890 // ciMethod::has_compiled_code

   891 bool ciMethod::has_compiled_code() {

   892   VM_ENTRY_MARK;

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

   894 }

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

   897 // ciMethod::instructions_size

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

   899 // before inlining with InlineSmallCode.

   900 // The CodeBlob::instructions_size accessor includes

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

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

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

   904 int ciMethod::instructions_size() {

   905   GUARDED_VM_ENTRY(

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

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

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

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

   910     // that currently isn't properly recorded.

   911     if (code == NULL ||

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

   913       return 0;

   914     }

   915     return code->code_end() - code->verified_entry_point();

   916   )

   917 }

   919 // ------------------------------------------------------------------

   920 // ciMethod::log_nmethod_identity

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

   922   GUARDED_VM_ENTRY(

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

   924     if (code != NULL) {

   925       code->log_identity(log);

   926     }

   927   )

   928 }

   930 // ------------------------------------------------------------------

   931 // ciMethod::is_not_reached

   932 bool ciMethod::is_not_reached(int bci) {

   933   check_is_loaded();

   934   VM_ENTRY_MARK;

   935   return Interpreter::is_not_reached(

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

   937 }

   939 // ------------------------------------------------------------------

   940 // ciMethod::was_never_executed

   941 bool ciMethod::was_executed_more_than(int times) {

   942   VM_ENTRY_MARK;

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

   944 }

   946 // ------------------------------------------------------------------

   947 // ciMethod::has_unloaded_classes_in_signature

   948 bool ciMethod::has_unloaded_classes_in_signature() {

   949   VM_ENTRY_MARK;

   950   {

   951     EXCEPTION_MARK;

   952     methodHandle m(THREAD, get_methodOop());

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

   954     if( HAS_PENDING_EXCEPTION ) {

   955       CLEAR_PENDING_EXCEPTION;

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

   957     }

   958     return has_unloaded;

   959   }

   960 }

   962 // ------------------------------------------------------------------

   963 // ciMethod::is_klass_loaded

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

   965   VM_ENTRY_MARK;

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

   967 }

   969 // ------------------------------------------------------------------

   970 // ciMethod::check_call

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

   972   VM_ENTRY_MARK;

   973   {

   974     EXCEPTION_MARK;

   975     HandleMark hm(THREAD);

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

   977     methodHandle spec_method;

   978     KlassHandle  spec_klass;

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

   980     if (HAS_PENDING_EXCEPTION) {

   981       CLEAR_PENDING_EXCEPTION;

   982       return false;

   983     } else {

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

   985     }

   986   }

   987   return false;

   988 }

   990 // ------------------------------------------------------------------

   991 // ciMethod::print_codes

   992 //

   993 // Print the bytecodes for this method.

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

   995   check_is_loaded();

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

   997 }

  1000 #define FETCH_FLAG_FROM_VM(flag_accessor) { \

  1001   check_is_loaded(); \

  1002   VM_ENTRY_MARK; \

  1003   return get_methodOop()->flag_accessor(); \

  1004 }

  1006 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }

  1007 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }

  1008 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }

  1009 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }

  1010 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }

  1011 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }

  1013 BCEscapeAnalyzer  *ciMethod::get_bcea() {

  1014   if (_bcea == NULL) {

  1015     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);

  1016   }

  1017   return _bcea;

  1018 }

  1020 ciMethodBlocks  *ciMethod::get_method_blocks() {

  1021   Arena *arena = CURRENT_ENV->arena();

  1022   if (_method_blocks == NULL) {

  1023     _method_blocks = new (arena) ciMethodBlocks(arena, this);

  1024   }

  1025   return _method_blocks;

  1026 }

  1028 #undef FETCH_FLAG_FROM_VM

  1031 // ------------------------------------------------------------------

  1032 // ciMethod::print_codes

  1033 //

  1034 // Print a range of the bytecodes for this method.

  1035 void ciMethod::print_codes_on(int from, int to, outputStream* st) {

  1036   check_is_loaded();

  1037   GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);)

  1038 }

  1040 // ------------------------------------------------------------------

  1041 // ciMethod::print_name

  1042 //

  1043 // Print the name of this method, including signature and some flags.

  1044 void ciMethod::print_name(outputStream* st) {

  1045   check_is_loaded();

  1046   GUARDED_VM_ENTRY(get_methodOop()->print_name(st);)

  1047 }

  1049 // ------------------------------------------------------------------

  1050 // ciMethod::print_short_name

  1051 //

  1052 // Print the name of this method, without signature.

  1053 void ciMethod::print_short_name(outputStream* st) {

  1054   check_is_loaded();

  1055   GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);)

  1056 }

  1058 // ------------------------------------------------------------------

  1059 // ciMethod::print_impl

  1060 //

  1061 // Implementation of the print method.

  1062 void ciMethod::print_impl(outputStream* st) {

  1063   ciObject::print_impl(st);

  1064   st->print(" name=");

  1065   name()->print_symbol_on(st);

  1066   st->print(" holder=");

  1067   holder()->print_name_on(st);

  1068   st->print(" signature=");

  1069   signature()->as_symbol()->print_symbol_on(st);

  1070   if (is_loaded()) {

  1071     st->print(" loaded=true flags=");

  1072     flags().print_member_flags(st);

  1073   } else {

  1074     st->print(" loaded=false");

  1075   }

  1076 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/ci/ciMethod.cpp@4ce7240d622c

src/share/vm/ci/ciMethod.cpp