jdk8-mips64-public/hotspot: src/share/vm/ci/ciMethod.cpp@ddd894528dbc

7056328: JSR 292 invocation sometimes fails in adapters for types not on boot class path
Reviewed-by: never

     1 /*

     2  * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

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

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

    18  *

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

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

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "ci/ciCallProfile.hpp"

    27 #include "ci/ciExceptionHandler.hpp"

    28 #include "ci/ciInstanceKlass.hpp"

    29 #include "ci/ciMethod.hpp"

    30 #include "ci/ciMethodBlocks.hpp"

    31 #include "ci/ciMethodData.hpp"

    32 #include "ci/ciMethodKlass.hpp"

    33 #include "ci/ciStreams.hpp"

    34 #include "ci/ciSymbol.hpp"

    35 #include "ci/ciUtilities.hpp"

    36 #include "classfile/systemDictionary.hpp"

    37 #include "compiler/abstractCompiler.hpp"

    38 #include "compiler/compilerOracle.hpp"

    39 #include "compiler/methodLiveness.hpp"

    40 #include "interpreter/interpreter.hpp"

    41 #include "interpreter/linkResolver.hpp"

    42 #include "interpreter/oopMapCache.hpp"

    43 #include "memory/allocation.inline.hpp"

    44 #include "memory/resourceArea.hpp"

    45 #include "oops/generateOopMap.hpp"

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

    47 #include "prims/nativeLookup.hpp"

    48 #include "runtime/deoptimization.hpp"

    49 #include "utilities/bitMap.inline.hpp"

    50 #include "utilities/xmlstream.hpp"

    51 #ifdef COMPILER2

    52 #include "ci/bcEscapeAnalyzer.hpp"

    53 #include "ci/ciTypeFlow.hpp"

    54 #include "oops/methodOop.hpp"

    55 #endif

    56 #ifdef SHARK

    57 #include "ci/ciTypeFlow.hpp"

    58 #include "oops/methodOop.hpp"

    59 #endif

    61 // ciMethod

    62 //

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

    64 // machine.

    67 // ------------------------------------------------------------------

    68 // ciMethod::ciMethod

    69 //

    70 // Loaded method.

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

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

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

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

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

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

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

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

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

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

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

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

    85   _is_c1_compilable   = !h_m()->is_not_c1_compilable();

    86   _is_c2_compilable   = !h_m()->is_not_c2_compilable();

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

    88   _code               = NULL;

    89   _exception_handlers = NULL;

    90   _liveness           = NULL;

    91   _method_blocks = NULL;

    92 #if defined(COMPILER2) || defined(SHARK)

    93   _flow               = NULL;

    94   _bcea               = NULL;

    95 #endif // COMPILER2 || SHARK

    97   ciEnv *env = CURRENT_ENV;

    98   if (env->jvmti_can_hotswap_or_post_breakpoint() && can_be_compiled()) {

    99     // 6328518 check hotswap conditions under the right lock.

   100     MutexLocker locker(Compile_lock);

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

   102       _is_c1_compilable = false;

   103       _is_c2_compilable = false;

   104     }

   105   } else {

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

   107   }

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

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

   111   } else {

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

   113     _can_be_statically_bound = false;

   114   }

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

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

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

   119     _can_be_statically_bound = true;

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

   121     _can_be_statically_bound = false;

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

   124   // These fields are always filled in.

   125   _name = env->get_symbol(h_m()->name());

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

   127   ciSymbol* sig_symbol = env->get_symbol(h_m()->signature());

   128   constantPoolHandle cpool = h_m()->constants();

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

   130   _method_data = NULL;

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

   132   if (ProfileInterpreter || TieredCompilation) {

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

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

   135     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;

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

   137   } else {

   138     _interpreter_invocation_count = 0;

   139     _interpreter_throwout_count = 0;

   140   }

   141   if (_interpreter_invocation_count == 0)

   142     _interpreter_invocation_count = 1;

   143 }

   146 // ------------------------------------------------------------------

   147 // ciMethod::ciMethod

   148 //

   149 // Unloaded method.

   150 ciMethod::ciMethod(ciInstanceKlass* holder,

   151                    ciSymbol* name,

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

   153   // These fields are always filled in.

   154   _name = name;

   155   _holder = holder;

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

   157   _intrinsic_id = vmIntrinsics::_none;

   158   _liveness = NULL;

   159   _can_be_statically_bound = false;

   160   _method_blocks = NULL;

   161   _method_data = NULL;

   162 #if defined(COMPILER2) || defined(SHARK)

   163   _flow = NULL;

   164   _bcea = NULL;

   165 #endif // COMPILER2 || SHARK

   166 }

   169 // ------------------------------------------------------------------

   170 // ciMethod::load_code

   171 //

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

   173 void ciMethod::load_code() {

   174   VM_ENTRY_MARK;

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

   177   methodOop me = get_methodOop();

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

   180   // Load the bytecodes.

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

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

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

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

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

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

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

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

   190       }

   191     }

   192   }

   194   // And load the exception table.

   195   typeArrayOop exc_table = me->exception_table();

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

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

   199   // an exception escapes the method.  See ciExceptionHandlerStream

   200   // for details.

   201   _exception_handlers =

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

   203                                          * (_handler_count + 1));

   204   if (_handler_count > 0) {

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

   206       int base = i*4;

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

   208                                 holder(),

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

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

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

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

   213     }

   214   }

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

   217   // of exceptional exit.

   218   _exception_handlers[_handler_count] =

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

   221   if (CIPrintMethodCodes) {

   222     print_codes();

   223   }

   224 }

   227 // ------------------------------------------------------------------

   228 // ciMethod::has_linenumber_table

   229 //

   230 // length unknown until decompression

   231 bool    ciMethod::has_linenumber_table() const {

   232   check_is_loaded();

   233   VM_ENTRY_MARK;

   234   return get_methodOop()->has_linenumber_table();

   235 }

   238 // ------------------------------------------------------------------

   239 // ciMethod::compressed_linenumber_table

   240 u_char* ciMethod::compressed_linenumber_table() const {

   241   check_is_loaded();

   242   VM_ENTRY_MARK;

   243   return get_methodOop()->compressed_linenumber_table();

   244 }

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

   248 // ciMethod::line_number_from_bci

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

   250   check_is_loaded();

   251   VM_ENTRY_MARK;

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

   253 }

   256 // ------------------------------------------------------------------

   257 // ciMethod::vtable_index

   258 //

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

   260 int ciMethod::vtable_index() {

   261   check_is_loaded();

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

   263   VM_ENTRY_MARK;

   264   return get_methodOop()->vtable_index();

   265 }

   268 #ifdef SHARK

   269 // ------------------------------------------------------------------

   270 // ciMethod::itable_index

   271 //

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

   273 int ciMethod::itable_index() {

   274   check_is_loaded();

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

   276   VM_ENTRY_MARK;

   277   return klassItable::compute_itable_index(get_methodOop());

   278 }

   279 #endif // SHARK

   282 // ------------------------------------------------------------------

   283 // ciMethod::native_entry

   284 //

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

   286 address ciMethod::native_entry() {

   287   check_is_loaded();

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

   289   VM_ENTRY_MARK;

   290   methodOop method = get_methodOop();

   291   address entry = method->native_function();

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

   293   return entry;

   294 }

   297 // ------------------------------------------------------------------

   298 // ciMethod::interpreter_entry

   299 //

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

   301 address ciMethod::interpreter_entry() {

   302   check_is_loaded();

   303   VM_ENTRY_MARK;

   304   methodHandle mh(THREAD, get_methodOop());

   305   return Interpreter::entry_for_method(mh);

   306 }

   309 // ------------------------------------------------------------------

   310 // ciMethod::uses_balanced_monitors

   311 //

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

   313 bool ciMethod::has_balanced_monitors() {

   314   check_is_loaded();

   315   if (_balanced_monitors) return true;

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

   318   VM_ENTRY_MARK;

   319   methodHandle method(THREAD, get_methodOop());

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

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

   323   // monitor-matching analysis.

   324   if (method->guaranteed_monitor_matching()) {

   325     _balanced_monitors = true;

   326     return true;

   327   }

   329   {

   330     EXCEPTION_MARK;

   331     ResourceMark rm(THREAD);

   332     GeneratePairingInfo gpi(method);

   333     gpi.compute_map(CATCH);

   334     if (!gpi.monitor_safe()) {

   335       return false;

   336     }

   337     method->set_guaranteed_monitor_matching();

   338     _balanced_monitors = true;

   339   }

   340   return true;

   341 }

   344 // ------------------------------------------------------------------

   345 // ciMethod::get_flow_analysis

   346 ciTypeFlow* ciMethod::get_flow_analysis() {

   347 #if defined(COMPILER2) || defined(SHARK)

   348   if (_flow == NULL) {

   349     ciEnv* env = CURRENT_ENV;

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

   351     _flow->do_flow();

   352   }

   353   return _flow;

   354 #else // COMPILER2 || SHARK

   355   ShouldNotReachHere();

   356   return NULL;

   357 #endif // COMPILER2 || SHARK

   358 }

   361 // ------------------------------------------------------------------

   362 // ciMethod::get_osr_flow_analysis

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

   364 #if defined(COMPILER2) || defined(SHARK)

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

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

   367   ciEnv* env = CURRENT_ENV;

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

   369   flow->do_flow();

   370   return flow;

   371 #else // COMPILER2 || SHARK

   372   ShouldNotReachHere();

   373   return NULL;

   374 #endif // COMPILER2 || SHARK

   375 }

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

   378 // ciMethod::raw_liveness_at_bci

   379 //

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

   381 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {

   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   return _liveness->get_liveness_at(bci);

   390 }

   392 // ------------------------------------------------------------------

   393 // ciMethod::liveness_at_bci

   394 //

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

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

   397 // information.

   398 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {

   399   MethodLivenessResult result = raw_liveness_at_bci(bci);

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

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

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

   403   }

   404   return result;

   405 }

   407 // ciMethod::live_local_oops_at_bci

   408 //

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

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

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

   412 // guard against conservative result from MethodLiveness making us

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

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

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

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

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

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

   419 // OSR when loading the locals.

   421 BitMap ciMethod::live_local_oops_at_bci(int bci) {

   422   VM_ENTRY_MARK;

   423   InterpreterOopMap mask;

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

   425   int mask_size = max_locals();

   426   BitMap result(mask_size);

   427   result.clear();

   428   int i;

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

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

   431   }

   432   return result;

   433 }

   436 #ifdef COMPILER1

   437 // ------------------------------------------------------------------

   438 // ciMethod::bci_block_start

   439 //

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

   441 const BitMap ciMethod::bci_block_start() {

   442   check_is_loaded();

   443   if (_liveness == NULL) {

   444     // Create the liveness analyzer.

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

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

   447     _liveness->compute_liveness();

   448   }

   450   return _liveness->get_bci_block_start();

   451 }

   452 #endif // COMPILER1

   455 // ------------------------------------------------------------------

   456 // ciMethod::call_profile_at_bci

   457 //

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

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

   460 ciCallProfile ciMethod::call_profile_at_bci(int bci) {

   461   ResourceMark rm;

   462   ciCallProfile result;

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

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

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

   466       // Every profiled call site has a counter.

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

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

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

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

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

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

   474         int receivers_count_total = 0;

   475         int morphism = 0;

   476         // Precompute morphism for the possible fixup

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

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

   479           if (receiver == NULL)  continue;

   480           morphism++;

   481         }

   482         int epsilon = 0;

   483         if (TieredCompilation && ProfileInterpreter) {

   484           // Interpreter and C1 treat final and special invokes differently.

   485           // C1 will record a type, whereas the interpreter will just

   486           // increment the count. Detect this case.

   487           if (morphism == 1 && count > 0) {

   488             epsilon = count;

   489             count = 0;

   490           }

   491         }

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

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

   494           if (receiver == NULL)  continue;

   495           int rcount = call->receiver_count(i) + epsilon;

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

   497           receivers_count_total += rcount;

   498           // Add the receiver to result data.

   499           result.add_receiver(receiver, rcount);

   500           // If we extend profiling to record methods,

   501           // we will set result._method also.

   502         }

   503         // Determine call site's morphism.

   504         // The call site count is 0 with known morphism (onlt 1 or 2 receivers)

   505         // or < 0 in the case of a type check failured for checkcast, aastore, instanceof.

   506         // The call site count is > 0 in the case of a polymorphic virtual call.

   507         if (morphism > 0 && morphism == result._limit) {

   508            // The morphism <= MorphismLimit.

   509            if ((morphism <  ciCallProfile::MorphismLimit) ||

   510                (morphism == ciCallProfile::MorphismLimit && count == 0)) {

   511 #ifdef ASSERT

   512              if (count > 0) {

   513                this->print_short_name(tty);

   514                tty->print_cr(" @ bci:%d", bci);

   515                this->print_codes();

   516                assert(false, "this call site should not be polymorphic");

   517              }

   518 #endif

   519              result._morphism = morphism;

   520            }

   521         }

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

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

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

   525         // receiver's counts.

   526         if (count >= 0) {

   527           count += receivers_count_total;

   528         }

   529       }

   530       result._count = count;

   531     }

   532   }

   533   return result;

   534 }

   536 // ------------------------------------------------------------------

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

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

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

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

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

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

   543   int i = _limit;

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

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

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

   547   }

   548   _receiver[i] = receiver;

   549   _receiver_count[i] = receiver_count;

   550   if (_limit < MorphismLimit) _limit++;

   551 }

   553 // ------------------------------------------------------------------

   554 // ciMethod::find_monomorphic_target

   555 //

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

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

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

   559 // The returned method is never abstract.

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

   561 // via assert_unique_concrete_method or assert_leaf_type.

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

   563                                             ciInstanceKlass* callee_holder,

   564                                             ciInstanceKlass* actual_recv) {

   565   check_is_loaded();

   567   if (actual_recv->is_interface()) {

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

   569     return NULL;

   570   }

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

   573   if (root_m == NULL) {

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

   575     return NULL;

   576   }

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

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

   581   // Is it private or final?

   582   if (root_m->can_be_statically_bound()) {

   583     return root_m;

   584   }

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

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

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

   589     return root_m;

   590   }

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

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

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

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

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

   598   if (!UseCHA)  return NULL;

   600   VM_ENTRY_MARK;

   602   methodHandle target;

   603   {

   604     MutexLocker locker(Compile_lock);

   605     klassOop context = actual_recv->get_klassOop();

   606     target = Dependencies::find_unique_concrete_method(context,

   607                                                        root_m->get_methodOop());

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

   609   }

   611 #ifndef PRODUCT

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

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

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

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

   616     target->print_short_name(tty);

   617     tty->cr();

   618   }

   619 #endif //PRODUCT

   621   if (target() == NULL) {

   622     return NULL;

   623   }

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

   625     return root_m;

   626   }

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

   628       !root_m->is_protected()) {

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

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

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

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

   633     // methods in other packages.

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

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

   636     return NULL;

   637   }

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

   639 }

   641 // ------------------------------------------------------------------

   642 // ciMethod::resolve_invoke

   643 //

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

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

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

   647    check_is_loaded();

   648    VM_ENTRY_MARK;

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

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

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

   653    Symbol* h_name      = name()->get_symbol();

   654    Symbol* h_signature = signature()->get_symbol();

   656    methodHandle m;

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

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

   659    if (h_recv->oop_is_javaArray()

   660         ||

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

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

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

   664      } else {

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

   666      }

   667    }

   669    if (m.is_null()) {

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

   671      return NULL;

   672    }

   674    ciMethod* result = this;

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

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

   677    }

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

   680    // optimizable or interesting.

   681    if (result->is_abstract()) {

   682      return NULL;

   683    } else {

   684      return result;

   685    }

   686 }

   688 // ------------------------------------------------------------------

   689 // ciMethod::resolve_vtable_index

   690 //

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

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

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

   694    check_is_loaded();

   696    int vtable_index = methodOopDesc::invalid_vtable_index;

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

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

   699    if (!receiver->is_interface()

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

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

   702      VM_ENTRY_MARK;

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

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

   706      Symbol* h_name = name()->get_symbol();

   707      Symbol* h_signature = signature()->get_symbol();

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

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

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

   712        vtable_index = methodOopDesc::invalid_vtable_index;

   713      }

   714    }

   716    return vtable_index;

   717 }

   719 // ------------------------------------------------------------------

   720 // ciMethod::interpreter_call_site_count

   721 int ciMethod::interpreter_call_site_count(int bci) {

   722   if (method_data() != NULL) {

   723     ResourceMark rm;

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

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

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

   727     }

   728   }

   729   return -1;  // unknown

   730 }

   732 // ------------------------------------------------------------------

   733 // Adjust a CounterData count to be commensurate with

   734 // interpreter_invocation_count.  If the MDO exists for

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

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

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

   738 // invocation counts in methods.

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

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

   741     int counter_life;

   742     int method_life = interpreter_invocation_count();

   743     if (TieredCompilation) {

   744       // In tiered the MDO's life is measured directly, so just use the snapshotted counters

   745       counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());

   746     } else {

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

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

   749       counter_life = current_mileage - creation_mileage;

   750     }

   752     // counter_life due to backedge_counter could be > method_life

   753     if (counter_life > method_life)

   754       counter_life = method_life;

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

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

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

   758     }

   759   }

   760   return count;

   761 }

   763 // ------------------------------------------------------------------

   764 // invokedynamic support

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

   767 // ciMethod::is_method_handle_invoke

   768 //

   769 // Return true if the method is an instance of one of the two

   770 // signature-polymorphic MethodHandle methods, invokeExact or invokeGeneric.

   771 bool ciMethod::is_method_handle_invoke() const {

   772   if (!is_loaded()) {

   773     bool flag = (holder()->name() == ciSymbol::java_lang_invoke_MethodHandle() &&

   774                  methodOopDesc::is_method_handle_invoke_name(name()->sid()));

   775     return flag;

   776   }

   777   VM_ENTRY_MARK;

   778   return get_methodOop()->is_method_handle_invoke();

   779 }

   781 // ------------------------------------------------------------------

   782 // ciMethod::is_method_handle_adapter

   783 //

   784 // Return true if the method is a generated MethodHandle adapter.

   785 // These are built by MethodHandleCompiler.

   786 bool ciMethod::is_method_handle_adapter() const {

   787   if (!is_loaded())  return false;

   788   VM_ENTRY_MARK;

   789   return get_methodOop()->is_method_handle_adapter();

   790 }

   792 ciInstance* ciMethod::method_handle_type() {

   793   check_is_loaded();

   794   VM_ENTRY_MARK;

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

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

   797 }

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

   801 // ciMethod::ensure_method_data

   802 //

   803 // Generate new methodDataOop objects at compile time.

   804 // Return true if allocation was successful or no MDO is required.

   805 bool ciMethod::ensure_method_data(methodHandle h_m) {

   806   EXCEPTION_CONTEXT;

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

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

   809     methodOopDesc::build_interpreter_method_data(h_m, THREAD);

   810     if (HAS_PENDING_EXCEPTION) {

   811       CLEAR_PENDING_EXCEPTION;

   812     }

   813   }

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

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

   816     _method_data->load_data();

   817     return true;

   818   } else {

   819     _method_data = CURRENT_ENV->get_empty_methodData();

   820     return false;

   821   }

   822 }

   824 // public, retroactive version

   825 bool ciMethod::ensure_method_data() {

   826   bool result = true;

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

   828     GUARDED_VM_ENTRY({

   829       result = ensure_method_data(get_methodOop());

   830     });

   831   }

   832   return result;

   833 }

   836 // ------------------------------------------------------------------

   837 // ciMethod::method_data

   838 //

   839 ciMethodData* ciMethod::method_data() {

   840   if (_method_data != NULL) {

   841     return _method_data;

   842   }

   843   VM_ENTRY_MARK;

   844   ciEnv* env = CURRENT_ENV;

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

   846   methodHandle h_m(my_thread, get_methodOop());

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

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

   850     _method_data->load_data();

   851   } else {

   852     _method_data = CURRENT_ENV->get_empty_methodData();

   853   }

   854   return _method_data;

   856 }

   858 // ------------------------------------------------------------------

   859 // ciMethod::method_data_or_null

   860 // Returns a pointer to ciMethodData if MDO exists on the VM side,

   861 // NULL otherwise.

   862 ciMethodData* ciMethod::method_data_or_null() {

   863   ciMethodData *md = method_data();

   864   if (md->is_empty()) return NULL;

   865   return md;

   866 }

   868 // ------------------------------------------------------------------

   869 // ciMethod::will_link

   870 //

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

   872 bool ciMethod::will_link(ciKlass* accessing_klass,

   873                          ciKlass* declared_method_holder,

   874                          Bytecodes::Code bc) {

   875   if (!is_loaded()) {

   876     // Method lookup failed.

   877     return false;

   878   }

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

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

   882   // in the future.

   884   return true;

   885 }

   887 // ------------------------------------------------------------------

   888 // ciMethod::should_exclude

   889 //

   890 // Should this method be excluded from compilation?

   891 bool ciMethod::should_exclude() {

   892   check_is_loaded();

   893   VM_ENTRY_MARK;

   894   methodHandle mh(THREAD, get_methodOop());

   895   bool ignore;

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

   897 }

   899 // ------------------------------------------------------------------

   900 // ciMethod::should_inline

   901 //

   902 // Should this method be inlined during compilation?

   903 bool ciMethod::should_inline() {

   904   check_is_loaded();

   905   VM_ENTRY_MARK;

   906   methodHandle mh(THREAD, get_methodOop());

   907   return CompilerOracle::should_inline(mh);

   908 }

   910 // ------------------------------------------------------------------

   911 // ciMethod::should_not_inline

   912 //

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

   914 bool ciMethod::should_not_inline() {

   915   check_is_loaded();

   916   VM_ENTRY_MARK;

   917   methodHandle mh(THREAD, get_methodOop());

   918   return CompilerOracle::should_not_inline(mh);

   919 }

   921 // ------------------------------------------------------------------

   922 // ciMethod::should_print_assembly

   923 //

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

   925 bool ciMethod::should_print_assembly() {

   926   check_is_loaded();

   927   VM_ENTRY_MARK;

   928   methodHandle mh(THREAD, get_methodOop());

   929   return CompilerOracle::should_print(mh);

   930 }

   932 // ------------------------------------------------------------------

   933 // ciMethod::break_at_execute

   934 //

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

   936 // method?

   937 bool ciMethod::break_at_execute() {

   938   check_is_loaded();

   939   VM_ENTRY_MARK;

   940   methodHandle mh(THREAD, get_methodOop());

   941   return CompilerOracle::should_break_at(mh);

   942 }

   944 // ------------------------------------------------------------------

   945 // ciMethod::has_option

   946 //

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

   948   check_is_loaded();

   949   VM_ENTRY_MARK;

   950   methodHandle mh(THREAD, get_methodOop());

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

   952 }

   954 // ------------------------------------------------------------------

   955 // ciMethod::can_be_compiled

   956 //

   957 // Have previous compilations of this method succeeded?

   958 bool ciMethod::can_be_compiled() {

   959   check_is_loaded();

   960   ciEnv* env = CURRENT_ENV;

   961   if (is_c1_compile(env->comp_level())) {

   962     return _is_c1_compilable;

   963   }

   964   return _is_c2_compilable;

   965 }

   967 // ------------------------------------------------------------------

   968 // ciMethod::set_not_compilable

   969 //

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

   971 void ciMethod::set_not_compilable() {

   972   check_is_loaded();

   973   VM_ENTRY_MARK;

   974   ciEnv* env = CURRENT_ENV;

   975   if (is_c1_compile(env->comp_level())) {

   976     _is_c1_compilable = false;

   977   } else {

   978     _is_c2_compilable = false;

   979   }

   980   get_methodOop()->set_not_compilable(env->comp_level());

   981 }

   983 // ------------------------------------------------------------------

   984 // ciMethod::can_be_osr_compiled

   985 //

   986 // Have previous compilations of this method succeeded?

   987 //

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

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

   990 // is currently unused.

   991 bool ciMethod::can_be_osr_compiled(int entry_bci) {

   992   check_is_loaded();

   993   VM_ENTRY_MARK;

   994   ciEnv* env = CURRENT_ENV;

   995   return !get_methodOop()->is_not_osr_compilable(env->comp_level());

   996 }

   998 // ------------------------------------------------------------------

   999 // ciMethod::has_compiled_code

  1000 bool ciMethod::has_compiled_code() {

  1001   VM_ENTRY_MARK;

  1002   return get_methodOop()->code() != NULL;

  1003 }

  1005 int ciMethod::comp_level() {

  1006   check_is_loaded();

  1007   VM_ENTRY_MARK;

  1008   nmethod* nm = get_methodOop()->code();

  1009   if (nm != NULL) return nm->comp_level();

  1010   return 0;

  1011 }

  1013 // ------------------------------------------------------------------

  1014 // ciMethod::instructions_size

  1015 //

  1016 // This is a rough metric for "fat" methods, compared before inlining

  1017 // with InlineSmallCode.  The CodeBlob::code_size accessor includes

  1018 // junk like exception handler, stubs, and constant table, which are

  1019 // not highly relevant to an inlined method.  So we use the more

  1020 // specific accessor nmethod::insts_size.

  1021 int ciMethod::instructions_size(int comp_level) {

  1022   GUARDED_VM_ENTRY(

  1023     nmethod* code = get_methodOop()->code();

  1024     if (code != NULL && (comp_level == CompLevel_any || comp_level == code->comp_level())) {

  1025       return code->insts_end() - code->verified_entry_point();

  1026     }

  1027     return 0;

  1028   )

  1029 }

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

  1032 // ciMethod::log_nmethod_identity

  1033 void ciMethod::log_nmethod_identity(xmlStream* log) {

  1034   GUARDED_VM_ENTRY(

  1035     nmethod* code = get_methodOop()->code();

  1036     if (code != NULL) {

  1037       code->log_identity(log);

  1038     }

  1039   )

  1040 }

  1042 // ------------------------------------------------------------------

  1043 // ciMethod::is_not_reached

  1044 bool ciMethod::is_not_reached(int bci) {

  1045   check_is_loaded();

  1046   VM_ENTRY_MARK;

  1047   return Interpreter::is_not_reached(

  1048                methodHandle(THREAD, get_methodOop()), bci);

  1049 }

  1051 // ------------------------------------------------------------------

  1052 // ciMethod::was_never_executed

  1053 bool ciMethod::was_executed_more_than(int times) {

  1054   VM_ENTRY_MARK;

  1055   return get_methodOop()->was_executed_more_than(times);

  1056 }

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

  1059 // ciMethod::has_unloaded_classes_in_signature

  1060 bool ciMethod::has_unloaded_classes_in_signature() {

  1061   VM_ENTRY_MARK;

  1062   {

  1063     EXCEPTION_MARK;

  1064     methodHandle m(THREAD, get_methodOop());

  1065     bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);

  1066     if( HAS_PENDING_EXCEPTION ) {

  1067       CLEAR_PENDING_EXCEPTION;

  1068       return true;     // Declare that we may have unloaded classes

  1069     }

  1070     return has_unloaded;

  1071   }

  1072 }

  1074 // ------------------------------------------------------------------

  1075 // ciMethod::is_klass_loaded

  1076 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {

  1077   VM_ENTRY_MARK;

  1078   return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved);

  1079 }

  1081 // ------------------------------------------------------------------

  1082 // ciMethod::check_call

  1083 bool ciMethod::check_call(int refinfo_index, bool is_static) const {

  1084   VM_ENTRY_MARK;

  1085   {

  1086     EXCEPTION_MARK;

  1087     HandleMark hm(THREAD);

  1088     constantPoolHandle pool (THREAD, get_methodOop()->constants());

  1089     methodHandle spec_method;

  1090     KlassHandle  spec_klass;

  1091     LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD);

  1092     if (HAS_PENDING_EXCEPTION) {

  1093       CLEAR_PENDING_EXCEPTION;

  1094       return false;

  1095     } else {

  1096       return (spec_method->is_static() == is_static);

  1097     }

  1098   }

  1099   return false;

  1100 }

  1102 // ------------------------------------------------------------------

  1103 // ciMethod::print_codes

  1104 //

  1105 // Print the bytecodes for this method.

  1106 void ciMethod::print_codes_on(outputStream* st) {

  1107   check_is_loaded();

  1108   GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);)

  1109 }

  1112 #define FETCH_FLAG_FROM_VM(flag_accessor) { \

  1113   check_is_loaded(); \

  1114   VM_ENTRY_MARK; \

  1115   return get_methodOop()->flag_accessor(); \

  1116 }

  1118 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }

  1119 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }

  1120 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }

  1121 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }

  1122 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }

  1123 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }

  1125 BCEscapeAnalyzer  *ciMethod::get_bcea() {

  1126 #ifdef COMPILER2

  1127   if (_bcea == NULL) {

  1128     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);

  1129   }

  1130   return _bcea;

  1131 #else // COMPILER2

  1132   ShouldNotReachHere();

  1133   return NULL;

  1134 #endif // COMPILER2

  1135 }

  1137 ciMethodBlocks  *ciMethod::get_method_blocks() {

  1138   Arena *arena = CURRENT_ENV->arena();

  1139   if (_method_blocks == NULL) {

  1140     _method_blocks = new (arena) ciMethodBlocks(arena, this);

  1141   }

  1142   return _method_blocks;

  1143 }

  1145 #undef FETCH_FLAG_FROM_VM

  1148 // ------------------------------------------------------------------

  1149 // ciMethod::print_codes

  1150 //

  1151 // Print a range of the bytecodes for this method.

  1152 void ciMethod::print_codes_on(int from, int to, outputStream* st) {

  1153   check_is_loaded();

  1154   GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);)

  1155 }

  1157 // ------------------------------------------------------------------

  1158 // ciMethod::print_name

  1159 //

  1160 // Print the name of this method, including signature and some flags.

  1161 void ciMethod::print_name(outputStream* st) {

  1162   check_is_loaded();

  1163   GUARDED_VM_ENTRY(get_methodOop()->print_name(st);)

  1164 }

  1166 // ------------------------------------------------------------------

  1167 // ciMethod::print_short_name

  1168 //

  1169 // Print the name of this method, without signature.

  1170 void ciMethod::print_short_name(outputStream* st) {

  1171   check_is_loaded();

  1172   GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);)

  1173 }

  1175 // ------------------------------------------------------------------

  1176 // ciMethod::print_impl

  1177 //

  1178 // Implementation of the print method.

  1179 void ciMethod::print_impl(outputStream* st) {

  1180   ciObject::print_impl(st);

  1181   st->print(" name=");

  1182   name()->print_symbol_on(st);

  1183   st->print(" holder=");

  1184   holder()->print_name_on(st);

  1185   st->print(" signature=");

  1186   signature()->as_symbol()->print_symbol_on(st);

  1187   if (is_loaded()) {

  1188     st->print(" loaded=true flags=");

  1189     flags().print_member_flags(st);

  1190   } else {

  1191     st->print(" loaded=false");

  1192   }

  1193 }

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

src/share/vm/ci/ciMethod.cpp@ddd894528dbc

src/share/vm/ci/ciMethod.cpp