jdk8-mips64-public/hotspot: src/share/vm/ci/ciMethod.cpp@3582bf76420e

6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank

     1 /*

     2  * Copyright (c) 1999, 2010, 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   _signature = new (env->arena()) ciSignature(_holder, sig_symbol);

   129   _method_data = NULL;

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

   131   if (ProfileInterpreter || TieredCompilation) {

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

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

   134     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;

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

   136   } else {

   137     _interpreter_invocation_count = 0;

   138     _interpreter_throwout_count = 0;

   139   }

   140   if (_interpreter_invocation_count == 0)

   141     _interpreter_invocation_count = 1;

   142 }

   145 // ------------------------------------------------------------------

   146 // ciMethod::ciMethod

   147 //

   148 // Unloaded method.

   149 ciMethod::ciMethod(ciInstanceKlass* holder,

   150                    ciSymbol* name,

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

   152   // These fields are always filled in.

   153   _name = name;

   154   _holder = holder;

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

   156   _intrinsic_id = vmIntrinsics::_none;

   157   _liveness = NULL;

   158   _can_be_statically_bound = false;

   159   _method_blocks = NULL;

   160   _method_data = NULL;

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

   162   _flow = NULL;

   163   _bcea = NULL;

   164 #endif // COMPILER2 || SHARK

   165 }

   168 // ------------------------------------------------------------------

   169 // ciMethod::load_code

   170 //

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

   172 void ciMethod::load_code() {

   173   VM_ENTRY_MARK;

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

   176   methodOop me = get_methodOop();

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

   179   // Load the bytecodes.

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

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

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

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

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

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

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

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

   189       }

   190     }

   191   }

   193   // And load the exception table.

   194   typeArrayOop exc_table = me->exception_table();

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

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

   198   // an exception escapes the method.  See ciExceptionHandlerStream

   199   // for details.

   200   _exception_handlers =

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

   202                                          * (_handler_count + 1));

   203   if (_handler_count > 0) {

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

   205       int base = i*4;

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

   207                                 holder(),

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

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

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

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

   212     }

   213   }

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

   216   // of exceptional exit.

   217   _exception_handlers[_handler_count] =

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

   220   if (CIPrintMethodCodes) {

   221     print_codes();

   222   }

   223 }

   226 // ------------------------------------------------------------------

   227 // ciMethod::has_linenumber_table

   228 //

   229 // length unknown until decompression

   230 bool    ciMethod::has_linenumber_table() const {

   231   check_is_loaded();

   232   VM_ENTRY_MARK;

   233   return get_methodOop()->has_linenumber_table();

   234 }

   237 // ------------------------------------------------------------------

   238 // ciMethod::compressed_linenumber_table

   239 u_char* ciMethod::compressed_linenumber_table() const {

   240   check_is_loaded();

   241   VM_ENTRY_MARK;

   242   return get_methodOop()->compressed_linenumber_table();

   243 }

   246 // ------------------------------------------------------------------

   247 // ciMethod::line_number_from_bci

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

   249   check_is_loaded();

   250   VM_ENTRY_MARK;

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

   252 }

   255 // ------------------------------------------------------------------

   256 // ciMethod::vtable_index

   257 //

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

   259 int ciMethod::vtable_index() {

   260   check_is_loaded();

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

   262   VM_ENTRY_MARK;

   263   return get_methodOop()->vtable_index();

   264 }

   267 #ifdef SHARK

   268 // ------------------------------------------------------------------

   269 // ciMethod::itable_index

   270 //

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

   272 int ciMethod::itable_index() {

   273   check_is_loaded();

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

   275   VM_ENTRY_MARK;

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

   277 }

   278 #endif // SHARK

   281 // ------------------------------------------------------------------

   282 // ciMethod::native_entry

   283 //

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

   285 address ciMethod::native_entry() {

   286   check_is_loaded();

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

   288   VM_ENTRY_MARK;

   289   methodOop method = get_methodOop();

   290   address entry = method->native_function();

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

   292   return entry;

   293 }

   296 // ------------------------------------------------------------------

   297 // ciMethod::interpreter_entry

   298 //

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

   300 address ciMethod::interpreter_entry() {

   301   check_is_loaded();

   302   VM_ENTRY_MARK;

   303   methodHandle mh(THREAD, get_methodOop());

   304   return Interpreter::entry_for_method(mh);

   305 }

   308 // ------------------------------------------------------------------

   309 // ciMethod::uses_balanced_monitors

   310 //

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

   312 bool ciMethod::has_balanced_monitors() {

   313   check_is_loaded();

   314   if (_balanced_monitors) return true;

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

   317   VM_ENTRY_MARK;

   318   methodHandle method(THREAD, get_methodOop());

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

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

   322   // monitor-matching analysis.

   323   if (method->guaranteed_monitor_matching()) {

   324     _balanced_monitors = true;

   325     return true;

   326   }

   328   {

   329     EXCEPTION_MARK;

   330     ResourceMark rm(THREAD);

   331     GeneratePairingInfo gpi(method);

   332     gpi.compute_map(CATCH);

   333     if (!gpi.monitor_safe()) {

   334       return false;

   335     }

   336     method->set_guaranteed_monitor_matching();

   337     _balanced_monitors = true;

   338   }

   339   return true;

   340 }

   343 // ------------------------------------------------------------------

   344 // ciMethod::get_flow_analysis

   345 ciTypeFlow* ciMethod::get_flow_analysis() {

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

   347   if (_flow == NULL) {

   348     ciEnv* env = CURRENT_ENV;

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

   350     _flow->do_flow();

   351   }

   352   return _flow;

   353 #else // COMPILER2 || SHARK

   354   ShouldNotReachHere();

   355   return NULL;

   356 #endif // COMPILER2 || SHARK

   357 }

   360 // ------------------------------------------------------------------

   361 // ciMethod::get_osr_flow_analysis

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

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

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

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

   366   ciEnv* env = CURRENT_ENV;

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

   368   flow->do_flow();

   369   return flow;

   370 #else // COMPILER2 || SHARK

   371   ShouldNotReachHere();

   372   return NULL;

   373 #endif // COMPILER2 || SHARK

   374 }

   376 // ------------------------------------------------------------------

   377 // ciMethod::raw_liveness_at_bci

   378 //

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

   380 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {

   381   check_is_loaded();

   382   if (_liveness == NULL) {

   383     // Create the liveness analyzer.

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

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

   386     _liveness->compute_liveness();

   387   }

   388   return _liveness->get_liveness_at(bci);

   389 }

   391 // ------------------------------------------------------------------

   392 // ciMethod::liveness_at_bci

   393 //

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

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

   396 // information.

   397 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {

   398   MethodLivenessResult result = raw_liveness_at_bci(bci);

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

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

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

   402   }

   403   return result;

   404 }

   406 // ciMethod::live_local_oops_at_bci

   407 //

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

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

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

   411 // guard against conservative result from MethodLiveness making us

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

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

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

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

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

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

   418 // OSR when loading the locals.

   420 BitMap ciMethod::live_local_oops_at_bci(int bci) {

   421   VM_ENTRY_MARK;

   422   InterpreterOopMap mask;

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

   424   int mask_size = max_locals();

   425   BitMap result(mask_size);

   426   result.clear();

   427   int i;

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

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

   430   }

   431   return result;

   432 }

   435 #ifdef COMPILER1

   436 // ------------------------------------------------------------------

   437 // ciMethod::bci_block_start

   438 //

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

   440 const BitMap ciMethod::bci_block_start() {

   441   check_is_loaded();

   442   if (_liveness == NULL) {

   443     // Create the liveness analyzer.

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

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

   446     _liveness->compute_liveness();

   447   }

   449   return _liveness->get_bci_block_start();

   450 }

   451 #endif // COMPILER1

   454 // ------------------------------------------------------------------

   455 // ciMethod::call_profile_at_bci

   456 //

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

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

   459 ciCallProfile ciMethod::call_profile_at_bci(int bci) {

   460   ResourceMark rm;

   461   ciCallProfile result;

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

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

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

   465       // Every profiled call site has a counter.

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

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

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

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

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

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

   473         int receivers_count_total = 0;

   474         int morphism = 0;

   475         // Precompute morphism for the possible fixup

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

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

   478           if (receiver == NULL)  continue;

   479           morphism++;

   480         }

   481         int epsilon = 0;

   482         if (TieredCompilation && ProfileInterpreter) {

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

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

   485           // increment the count. Detect this case.

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

   487             epsilon = count;

   488             count = 0;

   489           }

   490         }

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

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

   493           if (receiver == NULL)  continue;

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

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

   496           receivers_count_total += rcount;

   497           // Add the receiver to result data.

   498           result.add_receiver(receiver, rcount);

   499           // If we extend profiling to record methods,

   500           // we will set result._method also.

   501         }

   502         // Determine call site's morphism.

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

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

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

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

   507            // The morphism <= MorphismLimit.

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

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

   510 #ifdef ASSERT

   511              if (count > 0) {

   512                this->print_short_name(tty);

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

   514                this->print_codes();

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

   516              }

   517 #endif

   518              result._morphism = morphism;

   519            }

   520         }

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

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

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

   524         // receiver's counts.

   525         if (count >= 0) {

   526           count += receivers_count_total;

   527         }

   528       }

   529       result._count = count;

   530     }

   531   }

   532   return result;

   533 }

   535 // ------------------------------------------------------------------

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

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

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

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

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

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

   542   int i = _limit;

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

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

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

   546   }

   547   _receiver[i] = receiver;

   548   _receiver_count[i] = receiver_count;

   549   if (_limit < MorphismLimit) _limit++;

   550 }

   552 // ------------------------------------------------------------------

   553 // ciMethod::find_monomorphic_target

   554 //

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

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

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

   558 // The returned method is never abstract.

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

   560 // via assert_unique_concrete_method or assert_leaf_type.

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

   562                                             ciInstanceKlass* callee_holder,

   563                                             ciInstanceKlass* actual_recv) {

   564   check_is_loaded();

   566   if (actual_recv->is_interface()) {

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

   568     return NULL;

   569   }

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

   572   if (root_m == NULL) {

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

   574     return NULL;

   575   }

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

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

   580   // Is it private or final?

   581   if (root_m->can_be_statically_bound()) {

   582     return root_m;

   583   }

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

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

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

   588     return root_m;

   589   }

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

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

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

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

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

   597   if (!UseCHA)  return NULL;

   599   VM_ENTRY_MARK;

   601   methodHandle target;

   602   {

   603     MutexLocker locker(Compile_lock);

   604     klassOop context = actual_recv->get_klassOop();

   605     target = Dependencies::find_unique_concrete_method(context,

   606                                                        root_m->get_methodOop());

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

   608   }

   610 #ifndef PRODUCT

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

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

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

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

   615     target->print_short_name(tty);

   616     tty->cr();

   617   }

   618 #endif //PRODUCT

   620   if (target() == NULL) {

   621     return NULL;

   622   }

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

   624     return root_m;

   625   }

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

   627       !root_m->is_protected()) {

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

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

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

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

   632     // methods in other packages.

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

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

   635     return NULL;

   636   }

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

   638 }

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

   641 // ciMethod::resolve_invoke

   642 //

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

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

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

   646    check_is_loaded();

   647    VM_ENTRY_MARK;

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

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

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

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

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

   655    methodHandle m;

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

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

   658    if (h_recv->oop_is_javaArray()

   659         ||

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

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

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

   663      } else {

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

   665      }

   666    }

   668    if (m.is_null()) {

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

   670      return NULL;

   671    }

   673    ciMethod* result = this;

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

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

   676    }

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

   679    // optimizable or interesting.

   680    if (result->is_abstract()) {

   681      return NULL;

   682    } else {

   683      return result;

   684    }

   685 }

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

   688 // ciMethod::resolve_vtable_index

   689 //

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

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

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

   693    check_is_loaded();

   695    int vtable_index = methodOopDesc::invalid_vtable_index;

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

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

   698    if (!receiver->is_interface()

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

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

   701      VM_ENTRY_MARK;

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

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

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

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

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

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

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

   711        vtable_index = methodOopDesc::invalid_vtable_index;

   712      }

   713    }

   715    return vtable_index;

   716 }

   718 // ------------------------------------------------------------------

   719 // ciMethod::interpreter_call_site_count

   720 int ciMethod::interpreter_call_site_count(int bci) {

   721   if (method_data() != NULL) {

   722     ResourceMark rm;

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

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

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

   726     }

   727   }

   728   return -1;  // unknown

   729 }

   731 // ------------------------------------------------------------------

   732 // Adjust a CounterData count to be commensurate with

   733 // interpreter_invocation_count.  If the MDO exists for

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

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

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

   737 // invocation counts in methods.

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

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

   740     int counter_life;

   741     int method_life = interpreter_invocation_count();

   742     if (TieredCompilation) {

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

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

   745     } else {

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

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

   748       counter_life = current_mileage - creation_mileage;

   749     }

   751     // counter_life due to backedge_counter could be > method_life

   752     if (counter_life > method_life)

   753       counter_life = method_life;

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

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

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

   757     }

   758   }

   759   return count;

   760 }

   762 // ------------------------------------------------------------------

   763 // invokedynamic support

   765 // ------------------------------------------------------------------

   766 // ciMethod::is_method_handle_invoke

   767 //

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

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

   770 bool ciMethod::is_method_handle_invoke() const {

   771   if (!is_loaded()) {

   772     bool flag = (holder()->name() == ciSymbol::java_dyn_MethodHandle() &&

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

   774     return flag;

   775   }

   776   VM_ENTRY_MARK;

   777   return get_methodOop()->is_method_handle_invoke();

   778 }

   780 // ------------------------------------------------------------------

   781 // ciMethod::is_method_handle_adapter

   782 //

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

   784 // These are built by MethodHandleCompiler.

   785 bool ciMethod::is_method_handle_adapter() const {

   786   if (!is_loaded())  return false;

   787   VM_ENTRY_MARK;

   788   return get_methodOop()->is_method_handle_adapter();

   789 }

   791 ciInstance* ciMethod::method_handle_type() {

   792   check_is_loaded();

   793   VM_ENTRY_MARK;

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

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

   796 }

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

   800 // ciMethod::ensure_method_data

   801 //

   802 // Generate new methodDataOop objects at compile time.

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

   804 bool ciMethod::ensure_method_data(methodHandle h_m) {

   805   EXCEPTION_CONTEXT;

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

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

   808     methodOopDesc::build_interpreter_method_data(h_m, THREAD);

   809     if (HAS_PENDING_EXCEPTION) {

   810       CLEAR_PENDING_EXCEPTION;

   811     }

   812   }

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

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

   815     _method_data->load_data();

   816     return true;

   817   } else {

   818     _method_data = CURRENT_ENV->get_empty_methodData();

   819     return false;

   820   }

   821 }

   823 // public, retroactive version

   824 bool ciMethod::ensure_method_data() {

   825   bool result = true;

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

   827     GUARDED_VM_ENTRY({

   828       result = ensure_method_data(get_methodOop());

   829     });

   830   }

   831   return result;

   832 }

   835 // ------------------------------------------------------------------

   836 // ciMethod::method_data

   837 //

   838 ciMethodData* ciMethod::method_data() {

   839   if (_method_data != NULL) {

   840     return _method_data;

   841   }

   842   VM_ENTRY_MARK;

   843   ciEnv* env = CURRENT_ENV;

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

   845   methodHandle h_m(my_thread, get_methodOop());

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

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

   849     _method_data->load_data();

   850   } else {

   851     _method_data = CURRENT_ENV->get_empty_methodData();

   852   }

   853   return _method_data;

   855 }

   857 // ------------------------------------------------------------------

   858 // ciMethod::method_data_or_null

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

   860 // NULL otherwise.

   861 ciMethodData* ciMethod::method_data_or_null() {

   862   ciMethodData *md = method_data();

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

   864   return md;

   865 }

   867 // ------------------------------------------------------------------

   868 // ciMethod::will_link

   869 //

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

   871 bool ciMethod::will_link(ciKlass* accessing_klass,

   872                          ciKlass* declared_method_holder,

   873                          Bytecodes::Code bc) {

   874   if (!is_loaded()) {

   875     // Method lookup failed.

   876     return false;

   877   }

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

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

   881   // in the future.

   883   return true;

   884 }

   886 // ------------------------------------------------------------------

   887 // ciMethod::should_exclude

   888 //

   889 // Should this method be excluded from compilation?

   890 bool ciMethod::should_exclude() {

   891   check_is_loaded();

   892   VM_ENTRY_MARK;

   893   methodHandle mh(THREAD, get_methodOop());

   894   bool ignore;

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

   896 }

   898 // ------------------------------------------------------------------

   899 // ciMethod::should_inline

   900 //

   901 // Should this method be inlined during compilation?

   902 bool ciMethod::should_inline() {

   903   check_is_loaded();

   904   VM_ENTRY_MARK;

   905   methodHandle mh(THREAD, get_methodOop());

   906   return CompilerOracle::should_inline(mh);

   907 }

   909 // ------------------------------------------------------------------

   910 // ciMethod::should_not_inline

   911 //

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

   913 bool ciMethod::should_not_inline() {

   914   check_is_loaded();

   915   VM_ENTRY_MARK;

   916   methodHandle mh(THREAD, get_methodOop());

   917   return CompilerOracle::should_not_inline(mh);

   918 }

   920 // ------------------------------------------------------------------

   921 // ciMethod::should_print_assembly

   922 //

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

   924 bool ciMethod::should_print_assembly() {

   925   check_is_loaded();

   926   VM_ENTRY_MARK;

   927   methodHandle mh(THREAD, get_methodOop());

   928   return CompilerOracle::should_print(mh);

   929 }

   931 // ------------------------------------------------------------------

   932 // ciMethod::break_at_execute

   933 //

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

   935 // method?

   936 bool ciMethod::break_at_execute() {

   937   check_is_loaded();

   938   VM_ENTRY_MARK;

   939   methodHandle mh(THREAD, get_methodOop());

   940   return CompilerOracle::should_break_at(mh);

   941 }

   943 // ------------------------------------------------------------------

   944 // ciMethod::has_option

   945 //

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

   947   check_is_loaded();

   948   VM_ENTRY_MARK;

   949   methodHandle mh(THREAD, get_methodOop());

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

   951 }

   953 // ------------------------------------------------------------------

   954 // ciMethod::can_be_compiled

   955 //

   956 // Have previous compilations of this method succeeded?

   957 bool ciMethod::can_be_compiled() {

   958   check_is_loaded();

   959   ciEnv* env = CURRENT_ENV;

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

   961     return _is_c1_compilable;

   962   }

   963   return _is_c2_compilable;

   964 }

   966 // ------------------------------------------------------------------

   967 // ciMethod::set_not_compilable

   968 //

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

   970 void ciMethod::set_not_compilable() {

   971   check_is_loaded();

   972   VM_ENTRY_MARK;

   973   ciEnv* env = CURRENT_ENV;

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

   975     _is_c1_compilable = false;

   976   } else {

   977     _is_c2_compilable = false;

   978   }

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

   980 }

   982 // ------------------------------------------------------------------

   983 // ciMethod::can_be_osr_compiled

   984 //

   985 // Have previous compilations of this method succeeded?

   986 //

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

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

   989 // is currently unused.

   990 bool ciMethod::can_be_osr_compiled(int entry_bci) {

   991   check_is_loaded();

   992   VM_ENTRY_MARK;

   993   ciEnv* env = CURRENT_ENV;

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

   995 }

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

   998 // ciMethod::has_compiled_code

   999 bool ciMethod::has_compiled_code() {

  1000   VM_ENTRY_MARK;

  1001   return get_methodOop()->code() != NULL;

  1002 }

  1004 int ciMethod::comp_level() {

  1005   check_is_loaded();

  1006   VM_ENTRY_MARK;

  1007   nmethod* nm = get_methodOop()->code();

  1008   if (nm != NULL) return nm->comp_level();

  1009   return 0;

  1010 }

  1012 // ------------------------------------------------------------------

  1013 // ciMethod::instructions_size

  1014 //

  1015 // This is a rough metric for "fat" methods, compared before inlining

  1016 // with InlineSmallCode.  The CodeBlob::code_size accessor includes

  1017 // junk like exception handler, stubs, and constant table, which are

  1018 // not highly relevant to an inlined method.  So we use the more

  1019 // specific accessor nmethod::insts_size.

  1020 int ciMethod::instructions_size(int comp_level) {

  1021   GUARDED_VM_ENTRY(

  1022     nmethod* code = get_methodOop()->code();

  1023     if (code != NULL && (comp_level == CompLevel_any || comp_level == code->comp_level())) {

  1024       return code->insts_end() - code->verified_entry_point();

  1025     }

  1026     return 0;

  1027   )

  1028 }

  1030 // ------------------------------------------------------------------

  1031 // ciMethod::log_nmethod_identity

  1032 void ciMethod::log_nmethod_identity(xmlStream* log) {

  1033   GUARDED_VM_ENTRY(

  1034     nmethod* code = get_methodOop()->code();

  1035     if (code != NULL) {

  1036       code->log_identity(log);

  1037     }

  1038   )

  1039 }

  1041 // ------------------------------------------------------------------

  1042 // ciMethod::is_not_reached

  1043 bool ciMethod::is_not_reached(int bci) {

  1044   check_is_loaded();

  1045   VM_ENTRY_MARK;

  1046   return Interpreter::is_not_reached(

  1047                methodHandle(THREAD, get_methodOop()), bci);

  1048 }

  1050 // ------------------------------------------------------------------

  1051 // ciMethod::was_never_executed

  1052 bool ciMethod::was_executed_more_than(int times) {

  1053   VM_ENTRY_MARK;

  1054   return get_methodOop()->was_executed_more_than(times);

  1055 }

  1057 // ------------------------------------------------------------------

  1058 // ciMethod::has_unloaded_classes_in_signature

  1059 bool ciMethod::has_unloaded_classes_in_signature() {

  1060   VM_ENTRY_MARK;

  1061   {

  1062     EXCEPTION_MARK;

  1063     methodHandle m(THREAD, get_methodOop());

  1064     bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);

  1065     if( HAS_PENDING_EXCEPTION ) {

  1066       CLEAR_PENDING_EXCEPTION;

  1067       return true;     // Declare that we may have unloaded classes

  1068     }

  1069     return has_unloaded;

  1070   }

  1071 }

  1073 // ------------------------------------------------------------------

  1074 // ciMethod::is_klass_loaded

  1075 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {

  1076   VM_ENTRY_MARK;

  1077   return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved);

  1078 }

  1080 // ------------------------------------------------------------------

  1081 // ciMethod::check_call

  1082 bool ciMethod::check_call(int refinfo_index, bool is_static) const {

  1083   VM_ENTRY_MARK;

  1084   {

  1085     EXCEPTION_MARK;

  1086     HandleMark hm(THREAD);

  1087     constantPoolHandle pool (THREAD, get_methodOop()->constants());

  1088     methodHandle spec_method;

  1089     KlassHandle  spec_klass;

  1090     LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD);

  1091     if (HAS_PENDING_EXCEPTION) {

  1092       CLEAR_PENDING_EXCEPTION;

  1093       return false;

  1094     } else {

  1095       return (spec_method->is_static() == is_static);

  1096     }

  1097   }

  1098   return false;

  1099 }

  1101 // ------------------------------------------------------------------

  1102 // ciMethod::print_codes

  1103 //

  1104 // Print the bytecodes for this method.

  1105 void ciMethod::print_codes_on(outputStream* st) {

  1106   check_is_loaded();

  1107   GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);)

  1108 }

  1111 #define FETCH_FLAG_FROM_VM(flag_accessor) { \

  1112   check_is_loaded(); \

  1113   VM_ENTRY_MARK; \

  1114   return get_methodOop()->flag_accessor(); \

  1115 }

  1117 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }

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

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

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

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

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

  1124 BCEscapeAnalyzer  *ciMethod::get_bcea() {

  1125 #ifdef COMPILER2

  1126   if (_bcea == NULL) {

  1127     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);

  1128   }

  1129   return _bcea;

  1130 #else // COMPILER2

  1131   ShouldNotReachHere();

  1132   return NULL;

  1133 #endif // COMPILER2

  1134 }

  1136 ciMethodBlocks  *ciMethod::get_method_blocks() {

  1137   Arena *arena = CURRENT_ENV->arena();

  1138   if (_method_blocks == NULL) {

  1139     _method_blocks = new (arena) ciMethodBlocks(arena, this);

  1140   }

  1141   return _method_blocks;

  1142 }

  1144 #undef FETCH_FLAG_FROM_VM

  1147 // ------------------------------------------------------------------

  1148 // ciMethod::print_codes

  1149 //

  1150 // Print a range of the bytecodes for this method.

  1151 void ciMethod::print_codes_on(int from, int to, outputStream* st) {

  1152   check_is_loaded();

  1153   GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);)

  1154 }

  1156 // ------------------------------------------------------------------

  1157 // ciMethod::print_name

  1158 //

  1159 // Print the name of this method, including signature and some flags.

  1160 void ciMethod::print_name(outputStream* st) {

  1161   check_is_loaded();

  1162   GUARDED_VM_ENTRY(get_methodOop()->print_name(st);)

  1163 }

  1165 // ------------------------------------------------------------------

  1166 // ciMethod::print_short_name

  1167 //

  1168 // Print the name of this method, without signature.

  1169 void ciMethod::print_short_name(outputStream* st) {

  1170   check_is_loaded();

  1171   GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);)

  1172 }

  1174 // ------------------------------------------------------------------

  1175 // ciMethod::print_impl

  1176 //

  1177 // Implementation of the print method.

  1178 void ciMethod::print_impl(outputStream* st) {

  1179   ciObject::print_impl(st);

  1180   st->print(" name=");

  1181   name()->print_symbol_on(st);

  1182   st->print(" holder=");

  1183   holder()->print_name_on(st);

  1184   st->print(" signature=");

  1185   signature()->as_symbol()->print_symbol_on(st);

  1186   if (is_loaded()) {

  1187     st->print(" loaded=true flags=");

  1188     flags().print_member_flags(st);

  1189   } else {

  1190     st->print(" loaded=false");

  1191   }

  1192 }

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

src/share/vm/ci/ciMethod.cpp@3582bf76420e

src/share/vm/ci/ciMethod.cpp