jdk8-mips64-public/hotspot: src/share/vm/ci/ciMethod.cpp@bb33c6fdcf0d

8001077: remove ciMethod::will_link
Summary: Removed will_link and changed all calls to is_loaded().
Reviewed-by: kvn

     1 /*

     2  * Copyright (c) 1999, 2012, 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/ciStreams.hpp"

    33 #include "ci/ciSymbol.hpp"

    34 #include "ci/ciReplay.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/method.hpp"

    55 #endif

    56 #ifdef SHARK

    57 #include "ci/ciTypeFlow.hpp"

    58 #include "oops/method.hpp"

    59 #endif

    61 // ciMethod

    62 //

    63 // This class represents a Method* in the HotSpot virtual

    64 // machine.

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

    68 // ciMethod::ciMethod

    69 //

    70 // Loaded method.

    71 ciMethod::ciMethod(methodHandle h_m) : ciMetadata(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();

    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 (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_instance_klass(h_m()->method_holder());

   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   _instructions_size = -1;

   144 #ifdef ASSERT

   145   if (ReplayCompiles) {

   146     ciReplay::initialize(this);

   147   }

   148 #endif

   149 }

   152 // ------------------------------------------------------------------

   153 // ciMethod::ciMethod

   154 //

   155 // Unloaded method.

   156 ciMethod::ciMethod(ciInstanceKlass* holder,

   157                    ciSymbol*        name,

   158                    ciSymbol*        signature,

   159                    ciInstanceKlass* accessor) :

   160   ciMetadata((Metadata*)NULL),

   161   _name(                   name),

   162   _holder(                 holder),

   163   _intrinsic_id(           vmIntrinsics::_none),

   164   _liveness(               NULL),

   165   _can_be_statically_bound(false),

   166   _method_blocks(          NULL),

   167   _method_data(            NULL)

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

   169   ,

   170   _flow(                   NULL),

   171   _bcea(                   NULL),

   172   _instructions_size(-1)

   173 #endif // COMPILER2 || SHARK

   174 {

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

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

   177   // sites) so we pass the accessor.

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

   179 }

   182 // ------------------------------------------------------------------

   183 // ciMethod::load_code

   184 //

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

   186 void ciMethod::load_code() {

   187   VM_ENTRY_MARK;

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

   190   Method* me = get_Method();

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

   193   // Load the bytecodes.

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

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

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

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

   199     BreakpointInfo* bp = me->method_holder()->breakpoints();

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

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

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

   203       }

   204     }

   205   }

   207   // And load the exception table.

   208   ExceptionTable exc_table(me);

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

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

   212   // an exception escapes the method.  See ciExceptionHandlerStream

   213   // for details.

   214   _exception_handlers =

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

   216                                          * (_handler_count + 1));

   217   if (_handler_count > 0) {

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

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

   220                                 holder(),

   221             /* start    */      exc_table.start_pc(i),

   222             /* limit    */      exc_table.end_pc(i),

   223             /* goto pc  */      exc_table.handler_pc(i),

   224             /* cp index */      exc_table.catch_type_index(i));

   225     }

   226   }

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

   229   // of exceptional exit.

   230   _exception_handlers[_handler_count] =

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

   233   if (CIPrintMethodCodes) {

   234     print_codes();

   235   }

   236 }

   239 // ------------------------------------------------------------------

   240 // ciMethod::has_linenumber_table

   241 //

   242 // length unknown until decompression

   243 bool    ciMethod::has_linenumber_table() const {

   244   check_is_loaded();

   245   VM_ENTRY_MARK;

   246   return get_Method()->has_linenumber_table();

   247 }

   250 // ------------------------------------------------------------------

   251 // ciMethod::compressed_linenumber_table

   252 u_char* ciMethod::compressed_linenumber_table() const {

   253   check_is_loaded();

   254   VM_ENTRY_MARK;

   255   return get_Method()->compressed_linenumber_table();

   256 }

   259 // ------------------------------------------------------------------

   260 // ciMethod::line_number_from_bci

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

   262   check_is_loaded();

   263   VM_ENTRY_MARK;

   264   return get_Method()->line_number_from_bci(bci);

   265 }

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

   269 // ciMethod::vtable_index

   270 //

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

   272 int ciMethod::vtable_index() {

   273   check_is_loaded();

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

   275   VM_ENTRY_MARK;

   276   return get_Method()->vtable_index();

   277 }

   280 #ifdef SHARK

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

   282 // ciMethod::itable_index

   283 //

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

   285 int ciMethod::itable_index() {

   286   check_is_loaded();

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

   288   VM_ENTRY_MARK;

   289   return klassItable::compute_itable_index(get_Method());

   290 }

   291 #endif // SHARK

   294 // ------------------------------------------------------------------

   295 // ciMethod::native_entry

   296 //

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

   298 address ciMethod::native_entry() {

   299   check_is_loaded();

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

   301   VM_ENTRY_MARK;

   302   Method* method = get_Method();

   303   address entry = method->native_function();

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

   305   return entry;

   306 }

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

   310 // ciMethod::interpreter_entry

   311 //

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

   313 address ciMethod::interpreter_entry() {

   314   check_is_loaded();

   315   VM_ENTRY_MARK;

   316   methodHandle mh(THREAD, get_Method());

   317   return Interpreter::entry_for_method(mh);

   318 }

   321 // ------------------------------------------------------------------

   322 // ciMethod::uses_balanced_monitors

   323 //

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

   325 bool ciMethod::has_balanced_monitors() {

   326   check_is_loaded();

   327   if (_balanced_monitors) return true;

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

   330   VM_ENTRY_MARK;

   331   methodHandle method(THREAD, get_Method());

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

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

   335   // monitor-matching analysis.

   336   if (method->guaranteed_monitor_matching()) {

   337     _balanced_monitors = true;

   338     return true;

   339   }

   341   {

   342     EXCEPTION_MARK;

   343     ResourceMark rm(THREAD);

   344     GeneratePairingInfo gpi(method);

   345     gpi.compute_map(CATCH);

   346     if (!gpi.monitor_safe()) {

   347       return false;

   348     }

   349     method->set_guaranteed_monitor_matching();

   350     _balanced_monitors = true;

   351   }

   352   return true;

   353 }

   356 // ------------------------------------------------------------------

   357 // ciMethod::get_flow_analysis

   358 ciTypeFlow* ciMethod::get_flow_analysis() {

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

   360   if (_flow == NULL) {

   361     ciEnv* env = CURRENT_ENV;

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

   363     _flow->do_flow();

   364   }

   365   return _flow;

   366 #else // COMPILER2 || SHARK

   367   ShouldNotReachHere();

   368   return NULL;

   369 #endif // COMPILER2 || SHARK

   370 }

   373 // ------------------------------------------------------------------

   374 // ciMethod::get_osr_flow_analysis

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

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

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

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

   379   ciEnv* env = CURRENT_ENV;

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

   381   flow->do_flow();

   382   return flow;

   383 #else // COMPILER2 || SHARK

   384   ShouldNotReachHere();

   385   return NULL;

   386 #endif // COMPILER2 || SHARK

   387 }

   389 // ------------------------------------------------------------------

   390 // ciMethod::raw_liveness_at_bci

   391 //

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

   393 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {

   394   check_is_loaded();

   395   if (_liveness == NULL) {

   396     // Create the liveness analyzer.

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

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

   399     _liveness->compute_liveness();

   400   }

   401   return _liveness->get_liveness_at(bci);

   402 }

   404 // ------------------------------------------------------------------

   405 // ciMethod::liveness_at_bci

   406 //

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

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

   409 // information.

   410 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {

   411   MethodLivenessResult result = raw_liveness_at_bci(bci);

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

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

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

   415   }

   416   return result;

   417 }

   419 // ciMethod::live_local_oops_at_bci

   420 //

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

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

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

   424 // guard against conservative result from MethodLiveness making us

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

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

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

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

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

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

   431 // OSR when loading the locals.

   433 BitMap ciMethod::live_local_oops_at_bci(int bci) {

   434   VM_ENTRY_MARK;

   435   InterpreterOopMap mask;

   436   OopMapCache::compute_one_oop_map(get_Method(), bci, &mask);

   437   int mask_size = max_locals();

   438   BitMap result(mask_size);

   439   result.clear();

   440   int i;

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

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

   443   }

   444   return result;

   445 }

   448 #ifdef COMPILER1

   449 // ------------------------------------------------------------------

   450 // ciMethod::bci_block_start

   451 //

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

   453 const BitMap ciMethod::bci_block_start() {

   454   check_is_loaded();

   455   if (_liveness == NULL) {

   456     // Create the liveness analyzer.

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

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

   459     _liveness->compute_liveness();

   460   }

   462   return _liveness->get_bci_block_start();

   463 }

   464 #endif // COMPILER1

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

   468 // ciMethod::call_profile_at_bci

   469 //

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

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

   472 ciCallProfile ciMethod::call_profile_at_bci(int bci) {

   473   ResourceMark rm;

   474   ciCallProfile result;

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

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

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

   478       // Every profiled call site has a counter.

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

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

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

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

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

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

   486         int receivers_count_total = 0;

   487         int morphism = 0;

   488         // Precompute morphism for the possible fixup

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

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

   491           if (receiver == NULL)  continue;

   492           morphism++;

   493         }

   494         int epsilon = 0;

   495         if (TieredCompilation && ProfileInterpreter) {

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

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

   498           // increment the count. Detect this case.

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

   500             epsilon = count;

   501             count = 0;

   502           }

   503         }

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

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

   506           if (receiver == NULL)  continue;

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

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

   509           receivers_count_total += rcount;

   510           // Add the receiver to result data.

   511           result.add_receiver(receiver, rcount);

   512           // If we extend profiling to record methods,

   513           // we will set result._method also.

   514         }

   515         // Determine call site's morphism.

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

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

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

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

   520            // The morphism <= MorphismLimit.

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

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

   523 #ifdef ASSERT

   524              if (count > 0) {

   525                this->print_short_name(tty);

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

   527                this->print_codes();

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

   529              }

   530 #endif

   531              result._morphism = morphism;

   532            }

   533         }

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

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

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

   537         // receiver's counts.

   538         if (count >= 0) {

   539           count += receivers_count_total;

   540         }

   541       }

   542       result._count = count;

   543     }

   544   }

   545   return result;

   546 }

   548 // ------------------------------------------------------------------

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

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

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

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

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

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

   555   int i = _limit;

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

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

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

   559   }

   560   _receiver[i] = receiver;

   561   _receiver_count[i] = receiver_count;

   562   if (_limit < MorphismLimit) _limit++;

   563 }

   565 // ------------------------------------------------------------------

   566 // ciMethod::find_monomorphic_target

   567 //

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

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

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

   571 // The returned method is never abstract.

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

   573 // via assert_unique_concrete_method or assert_leaf_type.

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

   575                                             ciInstanceKlass* callee_holder,

   576                                             ciInstanceKlass* actual_recv) {

   577   check_is_loaded();

   579   if (actual_recv->is_interface()) {

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

   581     return NULL;

   582   }

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

   585   if (root_m == NULL) {

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

   587     return NULL;

   588   }

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

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

   593   // Is it private or final?

   594   if (root_m->can_be_statically_bound()) {

   595     return root_m;

   596   }

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

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

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

   601     return root_m;

   602   }

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

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

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

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

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

   610   if (!UseCHA)  return NULL;

   612   VM_ENTRY_MARK;

   614   methodHandle target;

   615   {

   616     MutexLocker locker(Compile_lock);

   617     Klass* context = actual_recv->get_Klass();

   618     target = Dependencies::find_unique_concrete_method(context,

   619                                                        root_m->get_Method());

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

   621   }

   623 #ifndef PRODUCT

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

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

   626     tty->print_cr("  context = %s", InstanceKlass::cast(actual_recv->get_Klass())->external_name());

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

   628     target->print_short_name(tty);

   629     tty->cr();

   630   }

   631 #endif //PRODUCT

   633   if (target() == NULL) {

   634     return NULL;

   635   }

   636   if (target() == root_m->get_Method()) {

   637     return root_m;

   638   }

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

   640       !root_m->is_protected()) {

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

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

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

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

   645     // methods in other packages.

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

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

   648     return NULL;

   649   }

   650   return CURRENT_THREAD_ENV->get_method(target());

   651 }

   653 // ------------------------------------------------------------------

   654 // ciMethod::resolve_invoke

   655 //

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

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

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

   659    check_is_loaded();

   660    VM_ENTRY_MARK;

   662    KlassHandle caller_klass (THREAD, caller->get_Klass());

   663    KlassHandle h_recv       (THREAD, exact_receiver->get_Klass());

   664    KlassHandle h_resolved   (THREAD, holder()->get_Klass());

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

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

   668    methodHandle m;

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

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

   671    if (h_recv->oop_is_array()

   672         ||

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

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

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

   676      } else {

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

   678      }

   679    }

   681    if (m.is_null()) {

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

   683      return NULL;

   684    }

   686    ciMethod* result = this;

   687    if (m() != get_Method()) {

   688      result = CURRENT_THREAD_ENV->get_method(m());

   689    }

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

   692    // optimizable or interesting.

   693    if (result->is_abstract()) {

   694      return NULL;

   695    } else {

   696      return result;

   697    }

   698 }

   700 // ------------------------------------------------------------------

   701 // ciMethod::resolve_vtable_index

   702 //

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

   704 // Return Method::invalid_vtable_index if the vtable_index is unknown.

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

   706    check_is_loaded();

   708    int vtable_index = Method::invalid_vtable_index;

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

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

   711    if (!receiver->is_interface()

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

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

   714      VM_ENTRY_MARK;

   716      KlassHandle caller_klass (THREAD, caller->get_Klass());

   717      KlassHandle h_recv       (THREAD, receiver->get_Klass());

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

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

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

   722      if (vtable_index == Method::nonvirtual_vtable_index) {

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

   724        vtable_index = Method::invalid_vtable_index;

   725      }

   726    }

   728    return vtable_index;

   729 }

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

   732 // ciMethod::interpreter_call_site_count

   733 int ciMethod::interpreter_call_site_count(int bci) {

   734   if (method_data() != NULL) {

   735     ResourceMark rm;

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

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

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

   739     }

   740   }

   741   return -1;  // unknown

   742 }

   744 // ------------------------------------------------------------------

   745 // Adjust a CounterData count to be commensurate with

   746 // interpreter_invocation_count.  If the MDO exists for

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

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

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

   750 // invocation counts in methods.

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

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

   753     int counter_life;

   754     int method_life = interpreter_invocation_count();

   755     if (TieredCompilation) {

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

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

   758     } else {

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

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

   761       counter_life = current_mileage - creation_mileage;

   762     }

   764     // counter_life due to backedge_counter could be > method_life

   765     if (counter_life > method_life)

   766       counter_life = method_life;

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

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

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

   770     }

   771   }

   772   return count;

   773 }

   775 // ------------------------------------------------------------------

   776 // invokedynamic support

   778 // ------------------------------------------------------------------

   779 // ciMethod::is_method_handle_intrinsic

   780 //

   781 // Return true if the method is an instance of the JVM-generated

   782 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.

   783 bool ciMethod::is_method_handle_intrinsic() const {

   784   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded

   785   return (MethodHandles::is_signature_polymorphic(iid) &&

   786           MethodHandles::is_signature_polymorphic_intrinsic(iid));

   787 }

   789 // ------------------------------------------------------------------

   790 // ciMethod::is_compiled_lambda_form

   791 //

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

   793 // These are built by Java code.

   794 bool ciMethod::is_compiled_lambda_form() const {

   795   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded

   796   return iid == vmIntrinsics::_compiledLambdaForm;

   797 }

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

   800 // ciMethod::has_member_arg

   801 //

   802 // Return true if the method is a linker intrinsic like _linkToVirtual.

   803 // These are built by the JVM.

   804 bool ciMethod::has_member_arg() const {

   805   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded

   806   return (MethodHandles::is_signature_polymorphic(iid) &&

   807           MethodHandles::has_member_arg(iid));

   808 }

   810 // ------------------------------------------------------------------

   811 // ciMethod::ensure_method_data

   812 //

   813 // Generate new MethodData* objects at compile time.

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

   815 bool ciMethod::ensure_method_data(methodHandle h_m) {

   816   EXCEPTION_CONTEXT;

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

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

   819     Method::build_interpreter_method_data(h_m, THREAD);

   820     if (HAS_PENDING_EXCEPTION) {

   821       CLEAR_PENDING_EXCEPTION;

   822     }

   823   }

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

   825     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());

   826     _method_data->load_data();

   827     return true;

   828   } else {

   829     _method_data = CURRENT_ENV->get_empty_methodData();

   830     return false;

   831   }

   832 }

   834 // public, retroactive version

   835 bool ciMethod::ensure_method_data() {

   836   bool result = true;

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

   838     GUARDED_VM_ENTRY({

   839       result = ensure_method_data(get_Method());

   840     });

   841   }

   842   return result;

   843 }

   846 // ------------------------------------------------------------------

   847 // ciMethod::method_data

   848 //

   849 ciMethodData* ciMethod::method_data() {

   850   if (_method_data != NULL) {

   851     return _method_data;

   852   }

   853   VM_ENTRY_MARK;

   854   ciEnv* env = CURRENT_ENV;

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

   856   methodHandle h_m(my_thread, get_Method());

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

   859     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());

   860     _method_data->load_data();

   861   } else {

   862     _method_data = CURRENT_ENV->get_empty_methodData();

   863   }

   864   return _method_data;

   866 }

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

   869 // ciMethod::method_data_or_null

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

   871 // NULL otherwise.

   872 ciMethodData* ciMethod::method_data_or_null() {

   873   ciMethodData *md = method_data();

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

   875   return md;

   876 }

   878 // ------------------------------------------------------------------

   879 // ciMethod::should_exclude

   880 //

   881 // Should this method be excluded from compilation?

   882 bool ciMethod::should_exclude() {

   883   check_is_loaded();

   884   VM_ENTRY_MARK;

   885   methodHandle mh(THREAD, get_Method());

   886   bool ignore;

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

   888 }

   890 // ------------------------------------------------------------------

   891 // ciMethod::should_inline

   892 //

   893 // Should this method be inlined during compilation?

   894 bool ciMethod::should_inline() {

   895   check_is_loaded();

   896   VM_ENTRY_MARK;

   897   methodHandle mh(THREAD, get_Method());

   898   return CompilerOracle::should_inline(mh);

   899 }

   901 // ------------------------------------------------------------------

   902 // ciMethod::should_not_inline

   903 //

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

   905 bool ciMethod::should_not_inline() {

   906   check_is_loaded();

   907   VM_ENTRY_MARK;

   908   methodHandle mh(THREAD, get_Method());

   909   return CompilerOracle::should_not_inline(mh);

   910 }

   912 // ------------------------------------------------------------------

   913 // ciMethod::should_print_assembly

   914 //

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

   916 bool ciMethod::should_print_assembly() {

   917   check_is_loaded();

   918   VM_ENTRY_MARK;

   919   methodHandle mh(THREAD, get_Method());

   920   return CompilerOracle::should_print(mh);

   921 }

   923 // ------------------------------------------------------------------

   924 // ciMethod::break_at_execute

   925 //

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

   927 // method?

   928 bool ciMethod::break_at_execute() {

   929   check_is_loaded();

   930   VM_ENTRY_MARK;

   931   methodHandle mh(THREAD, get_Method());

   932   return CompilerOracle::should_break_at(mh);

   933 }

   935 // ------------------------------------------------------------------

   936 // ciMethod::has_option

   937 //

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

   939   check_is_loaded();

   940   VM_ENTRY_MARK;

   941   methodHandle mh(THREAD, get_Method());

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

   943 }

   945 // ------------------------------------------------------------------

   946 // ciMethod::can_be_compiled

   947 //

   948 // Have previous compilations of this method succeeded?

   949 bool ciMethod::can_be_compiled() {

   950   check_is_loaded();

   951   ciEnv* env = CURRENT_ENV;

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

   953     return _is_c1_compilable;

   954   }

   955   return _is_c2_compilable;

   956 }

   958 // ------------------------------------------------------------------

   959 // ciMethod::set_not_compilable

   960 //

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

   962 void ciMethod::set_not_compilable() {

   963   check_is_loaded();

   964   VM_ENTRY_MARK;

   965   ciEnv* env = CURRENT_ENV;

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

   967     _is_c1_compilable = false;

   968   } else {

   969     _is_c2_compilable = false;

   970   }

   971   get_Method()->set_not_compilable(env->comp_level());

   972 }

   974 // ------------------------------------------------------------------

   975 // ciMethod::can_be_osr_compiled

   976 //

   977 // Have previous compilations of this method succeeded?

   978 //

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

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

   981 // is currently unused.

   982 bool ciMethod::can_be_osr_compiled(int entry_bci) {

   983   check_is_loaded();

   984   VM_ENTRY_MARK;

   985   ciEnv* env = CURRENT_ENV;

   986   return !get_Method()->is_not_osr_compilable(env->comp_level());

   987 }

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

   990 // ciMethod::has_compiled_code

   991 bool ciMethod::has_compiled_code() {

   992   return instructions_size() > 0;

   993 }

   995 int ciMethod::comp_level() {

   996   check_is_loaded();

   997   VM_ENTRY_MARK;

   998   nmethod* nm = get_Method()->code();

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

  1000   return 0;

  1001 }

  1003 int ciMethod::highest_osr_comp_level() {

  1004   check_is_loaded();

  1005   VM_ENTRY_MARK;

  1006   return get_Method()->highest_osr_comp_level();

  1007 }

  1009 // ------------------------------------------------------------------

  1010 // ciMethod::code_size_for_inlining

  1011 //

  1012 // Code size for inlining decisions.  This method returns a code

  1013 // size of 1 for methods which has the ForceInline annotation.

  1014 int ciMethod::code_size_for_inlining() {

  1015   check_is_loaded();

  1016   if (get_Method()->force_inline()) {

  1017     return 1;

  1018   }

  1019   return code_size();

  1020 }

  1022 // ------------------------------------------------------------------

  1023 // ciMethod::instructions_size

  1024 //

  1025 // This is a rough metric for "fat" methods, compared before inlining

  1026 // with InlineSmallCode.  The CodeBlob::code_size accessor includes

  1027 // junk like exception handler, stubs, and constant table, which are

  1028 // not highly relevant to an inlined method.  So we use the more

  1029 // specific accessor nmethod::insts_size.

  1030 int ciMethod::instructions_size() {

  1031   if (_instructions_size == -1) {

  1032     GUARDED_VM_ENTRY(

  1033                      nmethod* code = get_Method()->code();

  1034                      if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {

  1035                        _instructions_size = code->insts_end() - code->verified_entry_point();

  1036                      } else {

  1037                        _instructions_size = 0;

  1038                      }

  1039                      );

  1040   }

  1041   return _instructions_size;

  1042 }

  1044 // ------------------------------------------------------------------

  1045 // ciMethod::log_nmethod_identity

  1046 void ciMethod::log_nmethod_identity(xmlStream* log) {

  1047   GUARDED_VM_ENTRY(

  1048     nmethod* code = get_Method()->code();

  1049     if (code != NULL) {

  1050       code->log_identity(log);

  1051     }

  1052   )

  1053 }

  1055 // ------------------------------------------------------------------

  1056 // ciMethod::is_not_reached

  1057 bool ciMethod::is_not_reached(int bci) {

  1058   check_is_loaded();

  1059   VM_ENTRY_MARK;

  1060   return Interpreter::is_not_reached(

  1061                methodHandle(THREAD, get_Method()), bci);

  1062 }

  1064 // ------------------------------------------------------------------

  1065 // ciMethod::was_never_executed

  1066 bool ciMethod::was_executed_more_than(int times) {

  1067   VM_ENTRY_MARK;

  1068   return get_Method()->was_executed_more_than(times);

  1069 }

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

  1072 // ciMethod::has_unloaded_classes_in_signature

  1073 bool ciMethod::has_unloaded_classes_in_signature() {

  1074   VM_ENTRY_MARK;

  1075   {

  1076     EXCEPTION_MARK;

  1077     methodHandle m(THREAD, get_Method());

  1078     bool has_unloaded = Method::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);

  1079     if( HAS_PENDING_EXCEPTION ) {

  1080       CLEAR_PENDING_EXCEPTION;

  1081       return true;     // Declare that we may have unloaded classes

  1082     }

  1083     return has_unloaded;

  1084   }

  1085 }

  1087 // ------------------------------------------------------------------

  1088 // ciMethod::is_klass_loaded

  1089 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {

  1090   VM_ENTRY_MARK;

  1091   return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);

  1092 }

  1094 // ------------------------------------------------------------------

  1095 // ciMethod::check_call

  1096 bool ciMethod::check_call(int refinfo_index, bool is_static) const {

  1097   VM_ENTRY_MARK;

  1098   {

  1099     EXCEPTION_MARK;

  1100     HandleMark hm(THREAD);

  1101     constantPoolHandle pool (THREAD, get_Method()->constants());

  1102     methodHandle spec_method;

  1103     KlassHandle  spec_klass;

  1104     Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);

  1105     LinkResolver::resolve_method_statically(spec_method, spec_klass, code, pool, refinfo_index, THREAD);

  1106     if (HAS_PENDING_EXCEPTION) {

  1107       CLEAR_PENDING_EXCEPTION;

  1108       return false;

  1109     } else {

  1110       return (spec_method->is_static() == is_static);

  1111     }

  1112   }

  1113   return false;

  1114 }

  1116 // ------------------------------------------------------------------

  1117 // ciMethod::print_codes

  1118 //

  1119 // Print the bytecodes for this method.

  1120 void ciMethod::print_codes_on(outputStream* st) {

  1121   check_is_loaded();

  1122   GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)

  1123 }

  1126 #define FETCH_FLAG_FROM_VM(flag_accessor) { \

  1127   check_is_loaded(); \

  1128   VM_ENTRY_MARK; \

  1129   return get_Method()->flag_accessor(); \

  1130 }

  1132 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }

  1133 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }

  1134 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }

  1135 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }

  1136 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }

  1137 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }

  1139 BCEscapeAnalyzer  *ciMethod::get_bcea() {

  1140 #ifdef COMPILER2

  1141   if (_bcea == NULL) {

  1142     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);

  1143   }

  1144   return _bcea;

  1145 #else // COMPILER2

  1146   ShouldNotReachHere();

  1147   return NULL;

  1148 #endif // COMPILER2

  1149 }

  1151 ciMethodBlocks  *ciMethod::get_method_blocks() {

  1152   Arena *arena = CURRENT_ENV->arena();

  1153   if (_method_blocks == NULL) {

  1154     _method_blocks = new (arena) ciMethodBlocks(arena, this);

  1155   }

  1156   return _method_blocks;

  1157 }

  1159 #undef FETCH_FLAG_FROM_VM

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

  1162   ASSERT_IN_VM;

  1163   Method* method = get_Method();

  1164   Klass*  holder = method->method_holder();

  1165   st->print_cr("ciMethod %s %s %s %d %d %d %d %d",

  1166                holder->name()->as_quoted_ascii(),

  1167                method->name()->as_quoted_ascii(),

  1168                method->signature()->as_quoted_ascii(),

  1169                method->invocation_counter()->raw_counter(),

  1170                method->backedge_counter()->raw_counter(),

  1171                interpreter_invocation_count(),

  1172                interpreter_throwout_count(),

  1173                _instructions_size);

  1174 }

  1176 // ------------------------------------------------------------------

  1177 // ciMethod::print_codes

  1178 //

  1179 // Print a range of the bytecodes for this method.

  1180 void ciMethod::print_codes_on(int from, int to, outputStream* st) {

  1181   check_is_loaded();

  1182   GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)

  1183 }

  1185 // ------------------------------------------------------------------

  1186 // ciMethod::print_name

  1187 //

  1188 // Print the name of this method, including signature and some flags.

  1189 void ciMethod::print_name(outputStream* st) {

  1190   check_is_loaded();

  1191   GUARDED_VM_ENTRY(get_Method()->print_name(st);)

  1192 }

  1194 // ------------------------------------------------------------------

  1195 // ciMethod::print_short_name

  1196 //

  1197 // Print the name of this method, without signature.

  1198 void ciMethod::print_short_name(outputStream* st) {

  1199   if (is_loaded()) {

  1200     GUARDED_VM_ENTRY(get_Method()->print_short_name(st););

  1201   } else {

  1202     // Fall back if method is not loaded.

  1203     holder()->print_name_on(st);

  1204     st->print("::");

  1205     name()->print_symbol_on(st);

  1206     if (WizardMode)

  1207       signature()->as_symbol()->print_symbol_on(st);

  1208   }

  1209 }

  1211 // ------------------------------------------------------------------

  1212 // ciMethod::print_impl

  1213 //

  1214 // Implementation of the print method.

  1215 void ciMethod::print_impl(outputStream* st) {

  1216   ciMetadata::print_impl(st);

  1217   st->print(" name=");

  1218   name()->print_symbol_on(st);

  1219   st->print(" holder=");

  1220   holder()->print_name_on(st);

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

  1222   signature()->as_symbol()->print_symbol_on(st);

  1223   if (is_loaded()) {

  1224     st->print(" loaded=true");

  1225     st->print(" arg_size=%d", arg_size());

  1226     st->print(" flags=");

  1227     flags().print_member_flags(st);

  1228   } else {

  1229     st->print(" loaded=false");

  1230   }

  1231 }

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

src/share/vm/ci/ciMethod.cpp@bb33c6fdcf0d

src/share/vm/ci/ciMethod.cpp