jdk8-mips64-public/hotspot: src/share/vm/ci/ciMethod.cpp@5eb9169b1a14

7092712: JSR 292: unloaded invokedynamic call sites can lead to a crash with signature types not on BCP
Reviewed-by: jrose, 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,

   153                    ciInstanceKlass* accessor) :

   154   ciObject(ciMethodKlass::make()),

   155   _name(                   name),

   156   _holder(                 holder),

   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   ,

   164   _flow(                   NULL),

   165   _bcea(                   NULL)

   166 #endif // COMPILER2 || SHARK

   167 {

   168   // Usually holder and accessor are the same type but in some cases

   169   // the holder has the wrong class loader (e.g. invokedynamic call

   170   // sites) so we pass the accessor.

   171   _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);

   172 }

   175 // ------------------------------------------------------------------

   176 // ciMethod::load_code

   177 //

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

   179 void ciMethod::load_code() {

   180   VM_ENTRY_MARK;

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

   183   methodOop me = get_methodOop();

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

   186   // Load the bytecodes.

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

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

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

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

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

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

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

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

   196       }

   197     }

   198   }

   200   // And load the exception table.

   201   typeArrayOop exc_table = me->exception_table();

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

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

   205   // an exception escapes the method.  See ciExceptionHandlerStream

   206   // for details.

   207   _exception_handlers =

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

   209                                          * (_handler_count + 1));

   210   if (_handler_count > 0) {

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

   212       int base = i*4;

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

   214                                 holder(),

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

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

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

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

   219     }

   220   }

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

   223   // of exceptional exit.

   224   _exception_handlers[_handler_count] =

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

   227   if (CIPrintMethodCodes) {

   228     print_codes();

   229   }

   230 }

   233 // ------------------------------------------------------------------

   234 // ciMethod::has_linenumber_table

   235 //

   236 // length unknown until decompression

   237 bool    ciMethod::has_linenumber_table() const {

   238   check_is_loaded();

   239   VM_ENTRY_MARK;

   240   return get_methodOop()->has_linenumber_table();

   241 }

   244 // ------------------------------------------------------------------

   245 // ciMethod::compressed_linenumber_table

   246 u_char* ciMethod::compressed_linenumber_table() const {

   247   check_is_loaded();

   248   VM_ENTRY_MARK;

   249   return get_methodOop()->compressed_linenumber_table();

   250 }

   253 // ------------------------------------------------------------------

   254 // ciMethod::line_number_from_bci

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

   256   check_is_loaded();

   257   VM_ENTRY_MARK;

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

   259 }

   262 // ------------------------------------------------------------------

   263 // ciMethod::vtable_index

   264 //

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

   266 int ciMethod::vtable_index() {

   267   check_is_loaded();

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

   269   VM_ENTRY_MARK;

   270   return get_methodOop()->vtable_index();

   271 }

   274 #ifdef SHARK

   275 // ------------------------------------------------------------------

   276 // ciMethod::itable_index

   277 //

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

   279 int ciMethod::itable_index() {

   280   check_is_loaded();

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

   282   VM_ENTRY_MARK;

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

   284 }

   285 #endif // SHARK

   288 // ------------------------------------------------------------------

   289 // ciMethod::native_entry

   290 //

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

   292 address ciMethod::native_entry() {

   293   check_is_loaded();

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

   295   VM_ENTRY_MARK;

   296   methodOop method = get_methodOop();

   297   address entry = method->native_function();

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

   299   return entry;

   300 }

   303 // ------------------------------------------------------------------

   304 // ciMethod::interpreter_entry

   305 //

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

   307 address ciMethod::interpreter_entry() {

   308   check_is_loaded();

   309   VM_ENTRY_MARK;

   310   methodHandle mh(THREAD, get_methodOop());

   311   return Interpreter::entry_for_method(mh);

   312 }

   315 // ------------------------------------------------------------------

   316 // ciMethod::uses_balanced_monitors

   317 //

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

   319 bool ciMethod::has_balanced_monitors() {

   320   check_is_loaded();

   321   if (_balanced_monitors) return true;

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

   324   VM_ENTRY_MARK;

   325   methodHandle method(THREAD, get_methodOop());

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

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

   329   // monitor-matching analysis.

   330   if (method->guaranteed_monitor_matching()) {

   331     _balanced_monitors = true;

   332     return true;

   333   }

   335   {

   336     EXCEPTION_MARK;

   337     ResourceMark rm(THREAD);

   338     GeneratePairingInfo gpi(method);

   339     gpi.compute_map(CATCH);

   340     if (!gpi.monitor_safe()) {

   341       return false;

   342     }

   343     method->set_guaranteed_monitor_matching();

   344     _balanced_monitors = true;

   345   }

   346   return true;

   347 }

   350 // ------------------------------------------------------------------

   351 // ciMethod::get_flow_analysis

   352 ciTypeFlow* ciMethod::get_flow_analysis() {

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

   354   if (_flow == NULL) {

   355     ciEnv* env = CURRENT_ENV;

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

   357     _flow->do_flow();

   358   }

   359   return _flow;

   360 #else // COMPILER2 || SHARK

   361   ShouldNotReachHere();

   362   return NULL;

   363 #endif // COMPILER2 || SHARK

   364 }

   367 // ------------------------------------------------------------------

   368 // ciMethod::get_osr_flow_analysis

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

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

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

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

   373   ciEnv* env = CURRENT_ENV;

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

   375   flow->do_flow();

   376   return flow;

   377 #else // COMPILER2 || SHARK

   378   ShouldNotReachHere();

   379   return NULL;

   380 #endif // COMPILER2 || SHARK

   381 }

   383 // ------------------------------------------------------------------

   384 // ciMethod::raw_liveness_at_bci

   385 //

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

   387 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {

   388   check_is_loaded();

   389   if (_liveness == NULL) {

   390     // Create the liveness analyzer.

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

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

   393     _liveness->compute_liveness();

   394   }

   395   return _liveness->get_liveness_at(bci);

   396 }

   398 // ------------------------------------------------------------------

   399 // ciMethod::liveness_at_bci

   400 //

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

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

   403 // information.

   404 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {

   405   MethodLivenessResult result = raw_liveness_at_bci(bci);

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

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

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

   409   }

   410   return result;

   411 }

   413 // ciMethod::live_local_oops_at_bci

   414 //

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

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

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

   418 // guard against conservative result from MethodLiveness making us

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

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

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

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

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

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

   425 // OSR when loading the locals.

   427 BitMap ciMethod::live_local_oops_at_bci(int bci) {

   428   VM_ENTRY_MARK;

   429   InterpreterOopMap mask;

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

   431   int mask_size = max_locals();

   432   BitMap result(mask_size);

   433   result.clear();

   434   int i;

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

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

   437   }

   438   return result;

   439 }

   442 #ifdef COMPILER1

   443 // ------------------------------------------------------------------

   444 // ciMethod::bci_block_start

   445 //

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

   447 const BitMap ciMethod::bci_block_start() {

   448   check_is_loaded();

   449   if (_liveness == NULL) {

   450     // Create the liveness analyzer.

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

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

   453     _liveness->compute_liveness();

   454   }

   456   return _liveness->get_bci_block_start();

   457 }

   458 #endif // COMPILER1

   461 // ------------------------------------------------------------------

   462 // ciMethod::call_profile_at_bci

   463 //

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

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

   466 ciCallProfile ciMethod::call_profile_at_bci(int bci) {

   467   ResourceMark rm;

   468   ciCallProfile result;

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

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

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

   472       // Every profiled call site has a counter.

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

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

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

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

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

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

   480         int receivers_count_total = 0;

   481         int morphism = 0;

   482         // Precompute morphism for the possible fixup

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

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

   485           if (receiver == NULL)  continue;

   486           morphism++;

   487         }

   488         int epsilon = 0;

   489         if (TieredCompilation && ProfileInterpreter) {

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

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

   492           // increment the count. Detect this case.

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

   494             epsilon = count;

   495             count = 0;

   496           }

   497         }

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

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

   500           if (receiver == NULL)  continue;

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

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

   503           receivers_count_total += rcount;

   504           // Add the receiver to result data.

   505           result.add_receiver(receiver, rcount);

   506           // If we extend profiling to record methods,

   507           // we will set result._method also.

   508         }

   509         // Determine call site's morphism.

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

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

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

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

   514            // The morphism <= MorphismLimit.

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

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

   517 #ifdef ASSERT

   518              if (count > 0) {

   519                this->print_short_name(tty);

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

   521                this->print_codes();

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

   523              }

   524 #endif

   525              result._morphism = morphism;

   526            }

   527         }

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

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

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

   531         // receiver's counts.

   532         if (count >= 0) {

   533           count += receivers_count_total;

   534         }

   535       }

   536       result._count = count;

   537     }

   538   }

   539   return result;

   540 }

   542 // ------------------------------------------------------------------

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

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

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

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

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

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

   549   int i = _limit;

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

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

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

   553   }

   554   _receiver[i] = receiver;

   555   _receiver_count[i] = receiver_count;

   556   if (_limit < MorphismLimit) _limit++;

   557 }

   559 // ------------------------------------------------------------------

   560 // ciMethod::find_monomorphic_target

   561 //

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

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

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

   565 // The returned method is never abstract.

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

   567 // via assert_unique_concrete_method or assert_leaf_type.

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

   569                                             ciInstanceKlass* callee_holder,

   570                                             ciInstanceKlass* actual_recv) {

   571   check_is_loaded();

   573   if (actual_recv->is_interface()) {

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

   575     return NULL;

   576   }

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

   579   if (root_m == NULL) {

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

   581     return NULL;

   582   }

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

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

   587   // Is it private or final?

   588   if (root_m->can_be_statically_bound()) {

   589     return root_m;

   590   }

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

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

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

   595     return root_m;

   596   }

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

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

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

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

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

   604   if (!UseCHA)  return NULL;

   606   VM_ENTRY_MARK;

   608   methodHandle target;

   609   {

   610     MutexLocker locker(Compile_lock);

   611     klassOop context = actual_recv->get_klassOop();

   612     target = Dependencies::find_unique_concrete_method(context,

   613                                                        root_m->get_methodOop());

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

   615   }

   617 #ifndef PRODUCT

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

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

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

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

   622     target->print_short_name(tty);

   623     tty->cr();

   624   }

   625 #endif //PRODUCT

   627   if (target() == NULL) {

   628     return NULL;

   629   }

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

   631     return root_m;

   632   }

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

   634       !root_m->is_protected()) {

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

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

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

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

   639     // methods in other packages.

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

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

   642     return NULL;

   643   }

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

   645 }

   647 // ------------------------------------------------------------------

   648 // ciMethod::resolve_invoke

   649 //

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

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

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

   653    check_is_loaded();

   654    VM_ENTRY_MARK;

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

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

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

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

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

   662    methodHandle m;

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

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

   665    if (h_recv->oop_is_javaArray()

   666         ||

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

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

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

   670      } else {

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

   672      }

   673    }

   675    if (m.is_null()) {

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

   677      return NULL;

   678    }

   680    ciMethod* result = this;

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

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

   683    }

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

   686    // optimizable or interesting.

   687    if (result->is_abstract()) {

   688      return NULL;

   689    } else {

   690      return result;

   691    }

   692 }

   694 // ------------------------------------------------------------------

   695 // ciMethod::resolve_vtable_index

   696 //

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

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

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

   700    check_is_loaded();

   702    int vtable_index = methodOopDesc::invalid_vtable_index;

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

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

   705    if (!receiver->is_interface()

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

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

   708      VM_ENTRY_MARK;

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

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

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

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

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

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

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

   718        vtable_index = methodOopDesc::invalid_vtable_index;

   719      }

   720    }

   722    return vtable_index;

   723 }

   725 // ------------------------------------------------------------------

   726 // ciMethod::interpreter_call_site_count

   727 int ciMethod::interpreter_call_site_count(int bci) {

   728   if (method_data() != NULL) {

   729     ResourceMark rm;

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

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

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

   733     }

   734   }

   735   return -1;  // unknown

   736 }

   738 // ------------------------------------------------------------------

   739 // Adjust a CounterData count to be commensurate with

   740 // interpreter_invocation_count.  If the MDO exists for

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

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

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

   744 // invocation counts in methods.

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

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

   747     int counter_life;

   748     int method_life = interpreter_invocation_count();

   749     if (TieredCompilation) {

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

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

   752     } else {

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

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

   755       counter_life = current_mileage - creation_mileage;

   756     }

   758     // counter_life due to backedge_counter could be > method_life

   759     if (counter_life > method_life)

   760       counter_life = method_life;

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

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

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

   764     }

   765   }

   766   return count;

   767 }

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

   770 // invokedynamic support

   772 // ------------------------------------------------------------------

   773 // ciMethod::is_method_handle_invoke

   774 //

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

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

   777 bool ciMethod::is_method_handle_invoke() const {

   778   if (!is_loaded()) {

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

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

   781     return flag;

   782   }

   783   VM_ENTRY_MARK;

   784   return get_methodOop()->is_method_handle_invoke();

   785 }

   787 // ------------------------------------------------------------------

   788 // ciMethod::is_method_handle_adapter

   789 //

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

   791 // These are built by MethodHandleCompiler.

   792 bool ciMethod::is_method_handle_adapter() const {

   793   if (!is_loaded())  return false;

   794   VM_ENTRY_MARK;

   795   return get_methodOop()->is_method_handle_adapter();

   796 }

   798 ciInstance* ciMethod::method_handle_type() {

   799   check_is_loaded();

   800   VM_ENTRY_MARK;

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

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

   803 }

   806 // ------------------------------------------------------------------

   807 // ciMethod::ensure_method_data

   808 //

   809 // Generate new methodDataOop objects at compile time.

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

   811 bool ciMethod::ensure_method_data(methodHandle h_m) {

   812   EXCEPTION_CONTEXT;

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

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

   815     methodOopDesc::build_interpreter_method_data(h_m, THREAD);

   816     if (HAS_PENDING_EXCEPTION) {

   817       CLEAR_PENDING_EXCEPTION;

   818     }

   819   }

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

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

   822     _method_data->load_data();

   823     return true;

   824   } else {

   825     _method_data = CURRENT_ENV->get_empty_methodData();

   826     return false;

   827   }

   828 }

   830 // public, retroactive version

   831 bool ciMethod::ensure_method_data() {

   832   bool result = true;

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

   834     GUARDED_VM_ENTRY({

   835       result = ensure_method_data(get_methodOop());

   836     });

   837   }

   838   return result;

   839 }

   842 // ------------------------------------------------------------------

   843 // ciMethod::method_data

   844 //

   845 ciMethodData* ciMethod::method_data() {

   846   if (_method_data != NULL) {

   847     return _method_data;

   848   }

   849   VM_ENTRY_MARK;

   850   ciEnv* env = CURRENT_ENV;

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

   852   methodHandle h_m(my_thread, get_methodOop());

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

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

   856     _method_data->load_data();

   857   } else {

   858     _method_data = CURRENT_ENV->get_empty_methodData();

   859   }

   860   return _method_data;

   862 }

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

   865 // ciMethod::method_data_or_null

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

   867 // NULL otherwise.

   868 ciMethodData* ciMethod::method_data_or_null() {

   869   ciMethodData *md = method_data();

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

   871   return md;

   872 }

   874 // ------------------------------------------------------------------

   875 // ciMethod::will_link

   876 //

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

   878 bool ciMethod::will_link(ciKlass* accessing_klass,

   879                          ciKlass* declared_method_holder,

   880                          Bytecodes::Code bc) {

   881   if (!is_loaded()) {

   882     // Method lookup failed.

   883     return false;

   884   }

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

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

   888   // in the future.

   890   return true;

   891 }

   893 // ------------------------------------------------------------------

   894 // ciMethod::should_exclude

   895 //

   896 // Should this method be excluded from compilation?

   897 bool ciMethod::should_exclude() {

   898   check_is_loaded();

   899   VM_ENTRY_MARK;

   900   methodHandle mh(THREAD, get_methodOop());

   901   bool ignore;

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

   903 }

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

   906 // ciMethod::should_inline

   907 //

   908 // Should this method be inlined during compilation?

   909 bool ciMethod::should_inline() {

   910   check_is_loaded();

   911   VM_ENTRY_MARK;

   912   methodHandle mh(THREAD, get_methodOop());

   913   return CompilerOracle::should_inline(mh);

   914 }

   916 // ------------------------------------------------------------------

   917 // ciMethod::should_not_inline

   918 //

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

   920 bool ciMethod::should_not_inline() {

   921   check_is_loaded();

   922   VM_ENTRY_MARK;

   923   methodHandle mh(THREAD, get_methodOop());

   924   return CompilerOracle::should_not_inline(mh);

   925 }

   927 // ------------------------------------------------------------------

   928 // ciMethod::should_print_assembly

   929 //

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

   931 bool ciMethod::should_print_assembly() {

   932   check_is_loaded();

   933   VM_ENTRY_MARK;

   934   methodHandle mh(THREAD, get_methodOop());

   935   return CompilerOracle::should_print(mh);

   936 }

   938 // ------------------------------------------------------------------

   939 // ciMethod::break_at_execute

   940 //

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

   942 // method?

   943 bool ciMethod::break_at_execute() {

   944   check_is_loaded();

   945   VM_ENTRY_MARK;

   946   methodHandle mh(THREAD, get_methodOop());

   947   return CompilerOracle::should_break_at(mh);

   948 }

   950 // ------------------------------------------------------------------

   951 // ciMethod::has_option

   952 //

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

   954   check_is_loaded();

   955   VM_ENTRY_MARK;

   956   methodHandle mh(THREAD, get_methodOop());

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

   958 }

   960 // ------------------------------------------------------------------

   961 // ciMethod::can_be_compiled

   962 //

   963 // Have previous compilations of this method succeeded?

   964 bool ciMethod::can_be_compiled() {

   965   check_is_loaded();

   966   ciEnv* env = CURRENT_ENV;

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

   968     return _is_c1_compilable;

   969   }

   970   return _is_c2_compilable;

   971 }

   973 // ------------------------------------------------------------------

   974 // ciMethod::set_not_compilable

   975 //

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

   977 void ciMethod::set_not_compilable() {

   978   check_is_loaded();

   979   VM_ENTRY_MARK;

   980   ciEnv* env = CURRENT_ENV;

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

   982     _is_c1_compilable = false;

   983   } else {

   984     _is_c2_compilable = false;

   985   }

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

   987 }

   989 // ------------------------------------------------------------------

   990 // ciMethod::can_be_osr_compiled

   991 //

   992 // Have previous compilations of this method succeeded?

   993 //

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

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

   996 // is currently unused.

   997 bool ciMethod::can_be_osr_compiled(int entry_bci) {

   998   check_is_loaded();

   999   VM_ENTRY_MARK;

  1000   ciEnv* env = CURRENT_ENV;

  1001   return !get_methodOop()->is_not_osr_compilable(env->comp_level());

  1002 }

  1004 // ------------------------------------------------------------------

  1005 // ciMethod::has_compiled_code

  1006 bool ciMethod::has_compiled_code() {

  1007   VM_ENTRY_MARK;

  1008   return get_methodOop()->code() != NULL;

  1009 }

  1011 int ciMethod::comp_level() {

  1012   check_is_loaded();

  1013   VM_ENTRY_MARK;

  1014   nmethod* nm = get_methodOop()->code();

  1015   if (nm != NULL) return nm->comp_level();

  1016   return 0;

  1017 }

  1019 int ciMethod::highest_osr_comp_level() {

  1020   check_is_loaded();

  1021   VM_ENTRY_MARK;

  1022   return get_methodOop()->highest_osr_comp_level();

  1023 }

  1025 // ------------------------------------------------------------------

  1026 // ciMethod::code_size_for_inlining

  1027 //

  1028 // Code size for inlining decisions.

  1029 //

  1030 // Don't fully count method handle adapters against inlining budgets:

  1031 // the metric we use here is the number of call sites in the adapter

  1032 // as they are probably the instructions which generate some code.

  1033 int ciMethod::code_size_for_inlining() {

  1034   check_is_loaded();

  1036   // Method handle adapters

  1037   if (is_method_handle_adapter()) {

  1038     // Count call sites

  1039     int call_site_count = 0;

  1040     ciBytecodeStream iter(this);

  1041     while (iter.next() != ciBytecodeStream::EOBC()) {

  1042       if (Bytecodes::is_invoke(iter.cur_bc())) {

  1043         call_site_count++;

  1044       }

  1045     }

  1046     return call_site_count;

  1047   }

  1049   // Normal method

  1050   return code_size();

  1051 }

  1053 // ------------------------------------------------------------------

  1054 // ciMethod::instructions_size

  1055 //

  1056 // This is a rough metric for "fat" methods, compared before inlining

  1057 // with InlineSmallCode.  The CodeBlob::code_size accessor includes

  1058 // junk like exception handler, stubs, and constant table, which are

  1059 // not highly relevant to an inlined method.  So we use the more

  1060 // specific accessor nmethod::insts_size.

  1061 int ciMethod::instructions_size(int comp_level) {

  1062   GUARDED_VM_ENTRY(

  1063     nmethod* code = get_methodOop()->code();

  1064     if (code != NULL && (comp_level == CompLevel_any || comp_level == code->comp_level())) {

  1065       return code->insts_end() - code->verified_entry_point();

  1066     }

  1067     return 0;

  1068   )

  1069 }

  1071 // ------------------------------------------------------------------

  1072 // ciMethod::log_nmethod_identity

  1073 void ciMethod::log_nmethod_identity(xmlStream* log) {

  1074   GUARDED_VM_ENTRY(

  1075     nmethod* code = get_methodOop()->code();

  1076     if (code != NULL) {

  1077       code->log_identity(log);

  1078     }

  1079   )

  1080 }

  1082 // ------------------------------------------------------------------

  1083 // ciMethod::is_not_reached

  1084 bool ciMethod::is_not_reached(int bci) {

  1085   check_is_loaded();

  1086   VM_ENTRY_MARK;

  1087   return Interpreter::is_not_reached(

  1088                methodHandle(THREAD, get_methodOop()), bci);

  1089 }

  1091 // ------------------------------------------------------------------

  1092 // ciMethod::was_never_executed

  1093 bool ciMethod::was_executed_more_than(int times) {

  1094   VM_ENTRY_MARK;

  1095   return get_methodOop()->was_executed_more_than(times);

  1096 }

  1098 // ------------------------------------------------------------------

  1099 // ciMethod::has_unloaded_classes_in_signature

  1100 bool ciMethod::has_unloaded_classes_in_signature() {

  1101   VM_ENTRY_MARK;

  1102   {

  1103     EXCEPTION_MARK;

  1104     methodHandle m(THREAD, get_methodOop());

  1105     bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);

  1106     if( HAS_PENDING_EXCEPTION ) {

  1107       CLEAR_PENDING_EXCEPTION;

  1108       return true;     // Declare that we may have unloaded classes

  1109     }

  1110     return has_unloaded;

  1111   }

  1112 }

  1114 // ------------------------------------------------------------------

  1115 // ciMethod::is_klass_loaded

  1116 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {

  1117   VM_ENTRY_MARK;

  1118   return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved);

  1119 }

  1121 // ------------------------------------------------------------------

  1122 // ciMethod::check_call

  1123 bool ciMethod::check_call(int refinfo_index, bool is_static) const {

  1124   VM_ENTRY_MARK;

  1125   {

  1126     EXCEPTION_MARK;

  1127     HandleMark hm(THREAD);

  1128     constantPoolHandle pool (THREAD, get_methodOop()->constants());

  1129     methodHandle spec_method;

  1130     KlassHandle  spec_klass;

  1131     LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD);

  1132     if (HAS_PENDING_EXCEPTION) {

  1133       CLEAR_PENDING_EXCEPTION;

  1134       return false;

  1135     } else {

  1136       return (spec_method->is_static() == is_static);

  1137     }

  1138   }

  1139   return false;

  1140 }

  1142 // ------------------------------------------------------------------

  1143 // ciMethod::print_codes

  1144 //

  1145 // Print the bytecodes for this method.

  1146 void ciMethod::print_codes_on(outputStream* st) {

  1147   check_is_loaded();

  1148   GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);)

  1149 }

  1152 #define FETCH_FLAG_FROM_VM(flag_accessor) { \

  1153   check_is_loaded(); \

  1154   VM_ENTRY_MARK; \

  1155   return get_methodOop()->flag_accessor(); \

  1156 }

  1158 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }

  1159 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }

  1160 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }

  1161 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }

  1162 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }

  1163 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }

  1165 BCEscapeAnalyzer  *ciMethod::get_bcea() {

  1166 #ifdef COMPILER2

  1167   if (_bcea == NULL) {

  1168     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);

  1169   }

  1170   return _bcea;

  1171 #else // COMPILER2

  1172   ShouldNotReachHere();

  1173   return NULL;

  1174 #endif // COMPILER2

  1175 }

  1177 ciMethodBlocks  *ciMethod::get_method_blocks() {

  1178   Arena *arena = CURRENT_ENV->arena();

  1179   if (_method_blocks == NULL) {

  1180     _method_blocks = new (arena) ciMethodBlocks(arena, this);

  1181   }

  1182   return _method_blocks;

  1183 }

  1185 #undef FETCH_FLAG_FROM_VM

  1188 // ------------------------------------------------------------------

  1189 // ciMethod::print_codes

  1190 //

  1191 // Print a range of the bytecodes for this method.

  1192 void ciMethod::print_codes_on(int from, int to, outputStream* st) {

  1193   check_is_loaded();

  1194   GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);)

  1195 }

  1197 // ------------------------------------------------------------------

  1198 // ciMethod::print_name

  1199 //

  1200 // Print the name of this method, including signature and some flags.

  1201 void ciMethod::print_name(outputStream* st) {

  1202   check_is_loaded();

  1203   GUARDED_VM_ENTRY(get_methodOop()->print_name(st);)

  1204 }

  1206 // ------------------------------------------------------------------

  1207 // ciMethod::print_short_name

  1208 //

  1209 // Print the name of this method, without signature.

  1210 void ciMethod::print_short_name(outputStream* st) {

  1211   check_is_loaded();

  1212   GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);)

  1213 }

  1215 // ------------------------------------------------------------------

  1216 // ciMethod::print_impl

  1217 //

  1218 // Implementation of the print method.

  1219 void ciMethod::print_impl(outputStream* st) {

  1220   ciObject::print_impl(st);

  1221   st->print(" name=");

  1222   name()->print_symbol_on(st);

  1223   st->print(" holder=");

  1224   holder()->print_name_on(st);

  1225   st->print(" signature=");

  1226   signature()->as_symbol()->print_symbol_on(st);

  1227   if (is_loaded()) {

  1228     st->print(" loaded=true flags=");

  1229     flags().print_member_flags(st);

  1230   } else {

  1231     st->print(" loaded=false");

  1232   }

  1233 }

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

src/share/vm/ci/ciMethod.cpp@5eb9169b1a14

src/share/vm/ci/ciMethod.cpp