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

 /*

  * Copyright 1999-2008 Sun Microsystems, Inc.  All Rights Reserved.

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

  *

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

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

  * published by the Free Software Foundation.

  *

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

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

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

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

  * accompanied this code).

  *

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

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

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

  *

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

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

  * have any questions.

  *

  */

 #include "incls/_precompiled.incl"

 #include "incls/_ciMethod.cpp.incl"

 // ciMethod

 //

 // This class represents a methodOop in the HotSpot virtual

 // machine.

 // ------------------------------------------------------------------

 // ciMethod::ciMethod

 //

 // Loaded method.

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

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

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

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

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

   _max_stack          = h_m()->max_stack();

   _max_locals         = h_m()->max_locals();

   _code_size          = h_m()->code_size();

   _intrinsic_id       = h_m()->intrinsic_id();

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

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

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

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

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

   _code               = NULL;

   _exception_handlers = NULL;

   _liveness           = NULL;

   _bcea = NULL;

   _method_blocks = NULL;

 #ifdef COMPILER2

   _flow               = NULL;

 #endif // COMPILER2

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

     // 6328518 check hotswap conditions under the right lock.

     MutexLocker locker(Compile_lock);

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

       _is_compilable = false;

     }

   } else {

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

   }

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

     _can_be_statically_bound = h_m()->can_be_statically_bound();

   } else {

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

     _can_be_statically_bound = false;

   }

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

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

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

     _can_be_statically_bound = true;

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

     _can_be_statically_bound = false;

   ciEnv *env = CURRENT_ENV;

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

   // These fields are always filled in.

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

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

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

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

   _method_data = NULL;

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

   if (ProfileInterpreter) {

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

     // if the value overflowed report it as max int

     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;

     _interpreter_throwout_count   = h_m()->interpreter_throwout_count();

   } else {

     _interpreter_invocation_count = 0;

     _interpreter_throwout_count = 0;

   }

   if (_interpreter_invocation_count == 0)

     _interpreter_invocation_count = 1;

 }

 // ------------------------------------------------------------------

 // ciMethod::ciMethod

 //

 // Unloaded method.

 ciMethod::ciMethod(ciInstanceKlass* holder,

                    ciSymbol* name,

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

   // These fields are always filled in.

   _name = name;

   _holder = holder;

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

   _intrinsic_id = vmIntrinsics::_none;

   _liveness = NULL;

   _can_be_statically_bound = false;

   _bcea = NULL;

   _method_blocks = NULL;

   _method_data = NULL;

 #ifdef COMPILER2

   _flow = NULL;

 #endif // COMPILER2

 }

 // ------------------------------------------------------------------

 // ciMethod::load_code

 //

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

 void ciMethod::load_code() {

   VM_ENTRY_MARK;

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

   methodOop me = get_methodOop();

   Arena* arena = CURRENT_THREAD_ENV->arena();

   // Load the bytecodes.

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

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

   // Revert any breakpoint bytecodes in ci's copy

   if (me->number_of_breakpoints() > 0) {

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

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

       if (bp->match(me)) {

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

       }

     }

   }

   // And load the exception table.

   typeArrayOop exc_table = me->exception_table();

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

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

   // an exception escapes the method.  See ciExceptionHandlerStream

   // for details.

   _exception_handlers =

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

                                          * (_handler_count + 1));

   if (_handler_count > 0) {

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

       int base = i*4;

       _exception_handlers[i] = new (arena) ciExceptionHandler(

                                 holder(),

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

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

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

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

     }

   }

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

   // of exceptional exit.

   _exception_handlers[_handler_count] =

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

   if (CIPrintMethodCodes) {

     print_codes();

   }

 }

 // ------------------------------------------------------------------

 // ciMethod::has_linenumber_table

 //

 // length unknown until decompression

 bool    ciMethod::has_linenumber_table() const {

   check_is_loaded();

   VM_ENTRY_MARK;

   return get_methodOop()->has_linenumber_table();

 }

 // ------------------------------------------------------------------

 // ciMethod::compressed_linenumber_table

 u_char* ciMethod::compressed_linenumber_table() const {

   check_is_loaded();

   VM_ENTRY_MARK;

   return get_methodOop()->compressed_linenumber_table();

 }

 // ------------------------------------------------------------------

 // ciMethod::line_number_from_bci

 int ciMethod::line_number_from_bci(int bci) const {

   check_is_loaded();

   VM_ENTRY_MARK;

   return get_methodOop()->line_number_from_bci(bci);

 }

 // ------------------------------------------------------------------

 // ciMethod::vtable_index

 //

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

 int ciMethod::vtable_index() {

   check_is_loaded();

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

   VM_ENTRY_MARK;

   return get_methodOop()->vtable_index();

 }

 // ------------------------------------------------------------------

 // ciMethod::native_entry

 //

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

 address ciMethod::native_entry() {

   check_is_loaded();

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

   VM_ENTRY_MARK;

   methodOop method = get_methodOop();

   address entry = method->native_function();

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

   return entry;

 }

 // ------------------------------------------------------------------

 // ciMethod::interpreter_entry

 //

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

 address ciMethod::interpreter_entry() {

   check_is_loaded();

   VM_ENTRY_MARK;

   methodHandle mh(THREAD, get_methodOop());

   return Interpreter::entry_for_method(mh);

 }

 // ------------------------------------------------------------------

 // ciMethod::uses_balanced_monitors

 //

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

 bool ciMethod::has_balanced_monitors() {

   check_is_loaded();

   if (_balanced_monitors) return true;

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

   VM_ENTRY_MARK;

   methodHandle method(THREAD, get_methodOop());

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

   // Check to see if a previous compilation computed the

   // monitor-matching analysis.

   if (method->guaranteed_monitor_matching()) {

     _balanced_monitors = true;

     return true;

   }

   {

     EXCEPTION_MARK;

     ResourceMark rm(THREAD);

     GeneratePairingInfo gpi(method);

     gpi.compute_map(CATCH);

     if (!gpi.monitor_safe()) {

       return false;

     }

     method->set_guaranteed_monitor_matching();

     _balanced_monitors = true;

   }

   return true;

 }

 // ------------------------------------------------------------------

 // ciMethod::get_flow_analysis

 ciTypeFlow* ciMethod::get_flow_analysis() {

 #ifdef COMPILER2

   if (_flow == NULL) {

     ciEnv* env = CURRENT_ENV;

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

     _flow->do_flow();

   }

   return _flow;

 #else // COMPILER2

   ShouldNotReachHere();

   return NULL;

 #endif // COMPILER2

 }

 // ------------------------------------------------------------------

 // ciMethod::get_osr_flow_analysis

 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {

 #ifdef COMPILER2

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

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

   ciEnv* env = CURRENT_ENV;

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

   flow->do_flow();

   return flow;

 #else // COMPILER2

   ShouldNotReachHere();

   return NULL;

 #endif // COMPILER2

 }

 // ------------------------------------------------------------------

 // ciMethod::liveness_at_bci

 //

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

 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {

   check_is_loaded();

   if (_liveness == NULL) {

     // Create the liveness analyzer.

     Arena* arena = CURRENT_ENV->arena();

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

     _liveness->compute_liveness();

   }

   MethodLivenessResult result = _liveness->get_liveness_at(bci);

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

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

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

   }

   return result;

 }

 // ciMethod::live_local_oops_at_bci

 //

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

 // Compute what the interpreter believes by using the interpreter

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

 // guard against conservative result from MethodLiveness making us

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

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

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

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

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

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

 // OSR when loading the locals.

 BitMap ciMethod::live_local_oops_at_bci(int bci) {

   VM_ENTRY_MARK;

   InterpreterOopMap mask;

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

   int mask_size = max_locals();

   BitMap result(mask_size);

   result.clear();

   int i;

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

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

   }

   return result;

 }

 #ifdef COMPILER1

 // ------------------------------------------------------------------

 // ciMethod::bci_block_start

 //

 // Marks all bcis where a new basic block starts

 const BitMap ciMethod::bci_block_start() {

   check_is_loaded();

   if (_liveness == NULL) {

     // Create the liveness analyzer.

     Arena* arena = CURRENT_ENV->arena();

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

     _liveness->compute_liveness();

   }

   return _liveness->get_bci_block_start();

 }

 #endif // COMPILER1

 // ------------------------------------------------------------------

 // ciMethod::call_profile_at_bci

 //

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

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

 ciCallProfile ciMethod::call_profile_at_bci(int bci) {

   ResourceMark rm;

   ciCallProfile result;

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

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

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

       // Every profiled call site has a counter.

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

       if (!data->is_ReceiverTypeData()) {

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

       } else { // ReceiverTypeData is a subclass of CounterData

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

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

         int receivers_count_total = 0;

         int morphism = 0;

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

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

           if (receiver == NULL)  continue;

           morphism += 1;

           int rcount = call->receiver_count(i);

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

           receivers_count_total += rcount;

           // Add the receiver to result data.

           result.add_receiver(receiver, rcount);

           // If we extend profiling to record methods,

           // we will set result._method also.

         }

         // Determine call site's morphism.

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

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

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

         // but before receivers counters were updated.

         if (morphism == result._limit) {

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

            if (morphism <  ciCallProfile::MorphismLimit ||

                morphism == ciCallProfile::MorphismLimit &&

                (receivers_count_total+1) >= count) {

              result._morphism = morphism;

            }

         }

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

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

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

         // receiver's counts.

         if (count > 0) {

           if (count < receivers_count_total) {

             count = receivers_count_total;

           }

         }

       }

       result._count = count;

     }

   }

   return result;

 }

 // ------------------------------------------------------------------

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

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

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

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

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

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

   int i = _limit;

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

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

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

   }

   _receiver[i] = receiver;

   _receiver_count[i] = receiver_count;

   if (_limit < MorphismLimit) _limit++;

 }

 // ------------------------------------------------------------------

 // ciMethod::find_monomorphic_target

 //

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

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

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

 // The returned method is never abstract.

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

 // via assert_unique_concrete_method or assert_leaf_type.

 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,

                                             ciInstanceKlass* callee_holder,

                                             ciInstanceKlass* actual_recv) {

   check_is_loaded();

   if (actual_recv->is_interface()) {

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

     return NULL;

   }

   ciMethod* root_m = resolve_invoke(caller, actual_recv);

   if (root_m == NULL) {

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

     return NULL;

   }

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

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

   // Is it private or final?

   if (root_m->can_be_statically_bound()) {

     return root_m;

   }

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

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

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

     return root_m;

   }

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

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

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

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

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

   if (!UseCHA)  return NULL;

   VM_ENTRY_MARK;

   methodHandle target;

   {

     MutexLocker locker(Compile_lock);

     klassOop context = actual_recv->get_klassOop();

     target = Dependencies::find_unique_concrete_method(context,

                                                        root_m->get_methodOop());

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

   }

 #ifndef PRODUCT

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

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

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

     tty->print("  method  = ");

     target->print_short_name(tty);

     tty->cr();

   }

 #endif //PRODUCT

   if (target() == NULL) {

     return NULL;

   }

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

     return root_m;

   }

   if (!root_m->is_public() &&

       !root_m->is_protected()) {

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

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

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

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

     // methods in other packages.

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

     // with the same name but different vtable indexes.

     return NULL;

   }

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

 }

 // ------------------------------------------------------------------

 // ciMethod::resolve_invoke

 //

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

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

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

    check_is_loaded();

    VM_ENTRY_MARK;

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

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

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

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

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

    methodHandle m;

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

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

    if (h_recv->oop_is_javaArray()

         ||

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

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

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

      } else {

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

      }

    }

    if (m.is_null()) {

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

      return NULL;

    }

    ciMethod* result = this;

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

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

    }

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

    // optimizable or interesting.

    if (result->is_abstract()) {

      return NULL;

    } else {

      return result;

    }

 }

 // ------------------------------------------------------------------

 // ciMethod::resolve_vtable_index

 //

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

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

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

    check_is_loaded();

    int vtable_index = methodOopDesc::invalid_vtable_index;

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

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

    if (!receiver->is_interface()

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

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

      VM_ENTRY_MARK;

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

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

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

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

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

      if (vtable_index == methodOopDesc::nonvirtual_vtable_index) {

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

        vtable_index = methodOopDesc::invalid_vtable_index;

      }

    }

    return vtable_index;

 }

 // ------------------------------------------------------------------

 // ciMethod::interpreter_call_site_count

 int ciMethod::interpreter_call_site_count(int bci) {

   if (method_data() != NULL) {

     ResourceMark rm;

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

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

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

     }

   }

   return -1;  // unknown

 }

 // ------------------------------------------------------------------

 // Adjust a CounterData count to be commensurate with

 // interpreter_invocation_count.  If the MDO exists for

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

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

 // they can be usefully and stably compared against the

 // invocation counts in methods.

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

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

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

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

     int counter_life = current_mileage - creation_mileage;

     int method_life = interpreter_invocation_count();

     // counter_life due to backedge_counter could be > method_life

     if (counter_life > method_life)

       counter_life = method_life;

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

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

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

     }

   }

   return count;

 }

 // ------------------------------------------------------------------

 // ciMethod::build_method_data

 //

 // Generate new methodDataOop objects at compile time.

 void ciMethod::build_method_data(methodHandle h_m) {

   EXCEPTION_CONTEXT;

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

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

     methodOopDesc::build_interpreter_method_data(h_m, THREAD);

     if (HAS_PENDING_EXCEPTION) {

       CLEAR_PENDING_EXCEPTION;

     }

   }

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

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

     _method_data->load_data();

   } else {

     _method_data = CURRENT_ENV->get_empty_methodData();

   }

 }

 // public, retroactive version

 void ciMethod::build_method_data() {

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

     GUARDED_VM_ENTRY({

       build_method_data(get_methodOop());

     });

   }

 }

 // ------------------------------------------------------------------

 // ciMethod::method_data

 //

 ciMethodData* ciMethod::method_data() {

   if (_method_data != NULL) {

     return _method_data;

   }

   VM_ENTRY_MARK;

   ciEnv* env = CURRENT_ENV;

   Thread* my_thread = JavaThread::current();

   methodHandle h_m(my_thread, get_methodOop());

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

     build_method_data(h_m);

   }

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

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

     _method_data->load_data();

   } else {

     _method_data = CURRENT_ENV->get_empty_methodData();

   }

   return _method_data;

 }

 // ------------------------------------------------------------------

 // ciMethod::will_link

 //

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

 bool ciMethod::will_link(ciKlass* accessing_klass,

                          ciKlass* declared_method_holder,

                          Bytecodes::Code bc) {

   if (!is_loaded()) {

     // Method lookup failed.

     return false;

   }

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

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

   // in the future.

   return true;

 }

 // ------------------------------------------------------------------

 // ciMethod::should_exclude

 //

 // Should this method be excluded from compilation?

 bool ciMethod::should_exclude() {

   check_is_loaded();

   VM_ENTRY_MARK;

   methodHandle mh(THREAD, get_methodOop());

   bool ignore;

   return CompilerOracle::should_exclude(mh, ignore);

 }

 // ------------------------------------------------------------------

 // ciMethod::should_inline

 //

 // Should this method be inlined during compilation?

 bool ciMethod::should_inline() {

   check_is_loaded();

   VM_ENTRY_MARK;

   methodHandle mh(THREAD, get_methodOop());

   return CompilerOracle::should_inline(mh);

 }

 // ------------------------------------------------------------------

 // ciMethod::should_not_inline

 //

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

 bool ciMethod::should_not_inline() {

   check_is_loaded();

   VM_ENTRY_MARK;

   methodHandle mh(THREAD, get_methodOop());

   return CompilerOracle::should_not_inline(mh);

 }

 // ------------------------------------------------------------------

 // ciMethod::should_print_assembly

 //

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

 bool ciMethod::should_print_assembly() {

   check_is_loaded();

   VM_ENTRY_MARK;

   methodHandle mh(THREAD, get_methodOop());

   return CompilerOracle::should_print(mh);

 }

 // ------------------------------------------------------------------

 // ciMethod::break_at_execute

 //

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

 // method?

 bool ciMethod::break_at_execute() {

   check_is_loaded();

   VM_ENTRY_MARK;

   methodHandle mh(THREAD, get_methodOop());

   return CompilerOracle::should_break_at(mh);

 }

 // ------------------------------------------------------------------

 // ciMethod::has_option

 //

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

   check_is_loaded();

   VM_ENTRY_MARK;

   methodHandle mh(THREAD, get_methodOop());

   return CompilerOracle::has_option_string(mh, option);

 }

 // ------------------------------------------------------------------

 // ciMethod::can_be_compiled

 //

 // Have previous compilations of this method succeeded?

 bool ciMethod::can_be_compiled() {

   check_is_loaded();

   return _is_compilable;

 }

 // ------------------------------------------------------------------

 // ciMethod::set_not_compilable

 //

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

 void ciMethod::set_not_compilable() {

   check_is_loaded();

   VM_ENTRY_MARK;

   _is_compilable = false;

   get_methodOop()->set_not_compilable();

 }

 // ------------------------------------------------------------------

 // ciMethod::can_be_osr_compiled

 //

 // Have previous compilations of this method succeeded?

 //

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

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

 // is currently unused.

 bool ciMethod::can_be_osr_compiled(int entry_bci) {

   check_is_loaded();

   VM_ENTRY_MARK;

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

 }

 // ------------------------------------------------------------------

 // ciMethod::has_compiled_code

 bool ciMethod::has_compiled_code() {

   VM_ENTRY_MARK;

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

 }

 // ------------------------------------------------------------------

 // ciMethod::instructions_size

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

 // before inlining with InlineSmallCode.

 // The CodeBlob::instructions_size accessor includes

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

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

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

 int ciMethod::instructions_size() {

   GUARDED_VM_ENTRY(

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

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

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

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

     // that currently isn't properly recorded.

     if (code == NULL ||

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

       return 0;

     }

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

   )

 }

 // ------------------------------------------------------------------

 // ciMethod::log_nmethod_identity

 void ciMethod::log_nmethod_identity(xmlStream* log) {

   GUARDED_VM_ENTRY(

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

     if (code != NULL) {

       code->log_identity(log);

     }

   )

 }

 // ------------------------------------------------------------------

 // ciMethod::is_not_reached

 bool ciMethod::is_not_reached(int bci) {

   check_is_loaded();

   VM_ENTRY_MARK;

   return Interpreter::is_not_reached(

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

 }

 // ------------------------------------------------------------------

 // ciMethod::was_never_executed

 bool ciMethod::was_executed_more_than(int times) {

   VM_ENTRY_MARK;

   return get_methodOop()->was_executed_more_than(times);

 }

 // ------------------------------------------------------------------

 // ciMethod::has_unloaded_classes_in_signature

 bool ciMethod::has_unloaded_classes_in_signature() {

   VM_ENTRY_MARK;

   {

     EXCEPTION_MARK;

     methodHandle m(THREAD, get_methodOop());

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

     if( HAS_PENDING_EXCEPTION ) {

       CLEAR_PENDING_EXCEPTION;

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

     }

     return has_unloaded;

   }

 }

 // ------------------------------------------------------------------

 // ciMethod::is_klass_loaded

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

   VM_ENTRY_MARK;

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

 }

 // ------------------------------------------------------------------

 // ciMethod::check_call

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

   VM_ENTRY_MARK;

   {

     EXCEPTION_MARK;

     HandleMark hm(THREAD);

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

     methodHandle spec_method;

     KlassHandle  spec_klass;

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

     if (HAS_PENDING_EXCEPTION) {

       CLEAR_PENDING_EXCEPTION;

       return false;

     } else {

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

     }

   }

   return false;

 }

 // ------------------------------------------------------------------

 // ciMethod::print_codes

 //

 // Print the bytecodes for this method.

 void ciMethod::print_codes_on(outputStream* st) {

   check_is_loaded();

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

 }

 #define FETCH_FLAG_FROM_VM(flag_accessor) { \

   check_is_loaded(); \

   VM_ENTRY_MARK; \

   return get_methodOop()->flag_accessor(); \

 }

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

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

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

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

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

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

 BCEscapeAnalyzer  *ciMethod::get_bcea() {

   if (_bcea == NULL) {

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

   }

   return _bcea;

 }

 ciMethodBlocks  *ciMethod::get_method_blocks() {

   Arena *arena = CURRENT_ENV->arena();

   if (_method_blocks == NULL) {

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

   }

   return _method_blocks;

 }

 #undef FETCH_FLAG_FROM_VM

 // ------------------------------------------------------------------

 // ciMethod::print_codes

 //

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

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

   check_is_loaded();

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

 }

 // ------------------------------------------------------------------

 // ciMethod::print_name

 //

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

 void ciMethod::print_name(outputStream* st) {

   check_is_loaded();

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

 }

 // ------------------------------------------------------------------

 // ciMethod::print_short_name

 //

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

 void ciMethod::print_short_name(outputStream* st) {

   check_is_loaded();

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

 }

 // ------------------------------------------------------------------

 // ciMethod::print_impl

 //

 // Implementation of the print method.

 void ciMethod::print_impl(outputStream* st) {

   ciObject::print_impl(st);

   st->print(" name=");

   name()->print_symbol_on(st);

   st->print(" holder=");

   holder()->print_name_on(st);

   st->print(" signature=");

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

   if (is_loaded()) {

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

     flags().print_member_flags(st);

   } else {

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

   }

 }