1 /*
   2  * Copyright (c) 1999, 2019, 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  */
  24 
  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.inline.hpp"
  36 #include "classfile/systemDictionary.hpp"
  37 #include "compiler/abstractCompiler.hpp"
  38 #include "compiler/methodLiveness.hpp"
  39 #include "interpreter/interpreter.hpp"
  40 #include "interpreter/linkResolver.hpp"
  41 #include "interpreter/oopMapCache.hpp"
  42 #include "memory/allocation.inline.hpp"
  43 #include "memory/resourceArea.hpp"
  44 #include "oops/generateOopMap.hpp"
  45 #include "oops/method.inline.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 
  57 // ciMethod
  58 //
  59 // This class represents a Method* in the HotSpot virtual
  60 // machine.
  61 
  62 
  63 // ------------------------------------------------------------------
  64 // ciMethod::ciMethod
  65 //
  66 // Loaded method.
  67 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
  68   ciMetadata(h_m()),
  69   _holder(holder)
  70 {
  71   assert(h_m() != NULL, "no null method");
  72 
  73   if (LogTouchedMethods) {
  74     h_m()->log_touched(Thread::current());
  75   }
  76   // These fields are always filled in in loaded methods.
  77   _flags = ciFlags(h_m()->access_flags());
  78 
  79   // Easy to compute, so fill them in now.
  80   _max_stack          = h_m()->max_stack();
  81   _max_locals         = h_m()->max_locals();
  82   _code_size          = h_m()->code_size();
  83   _intrinsic_id       = h_m()->intrinsic_id();
  84   _handler_count      = h_m()->exception_table_length();
  85   _size_of_parameters = h_m()->size_of_parameters();
  86   _uses_monitors      = h_m()->access_flags().has_monitor_bytecodes();
  87   _balanced_monitors  = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
  88   _is_c1_compilable   = !h_m()->is_not_c1_compilable();
  89   _is_c2_compilable   = !h_m()->is_not_c2_compilable();
  90   _can_be_parsed      = true;
  91   _has_reserved_stack_access = h_m()->has_reserved_stack_access();
  92   // Lazy fields, filled in on demand.  Require allocation.
  93   _code               = NULL;
  94   _exception_handlers = NULL;
  95   _liveness           = NULL;
  96   _method_blocks = NULL;
  97 #if defined(COMPILER2)
  98   _flow               = NULL;
  99   _bcea               = NULL;
 100 #endif // COMPILER2
 101 
 102   ciEnv *env = CURRENT_ENV;
 103   if (env->jvmti_can_hotswap_or_post_breakpoint()) {
 104     // 6328518 check hotswap conditions under the right lock.
 105     MutexLocker locker(Compile_lock);
 106     if (Dependencies::check_evol_method(h_m()) != NULL) {
 107       _is_c1_compilable = false;
 108       _is_c2_compilable = false;
 109       _can_be_parsed = false;
 110     }
 111   } else {
 112     CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
 113   }
 114 
 115   if (h_m()->method_holder()->is_linked()) {
 116     _can_be_statically_bound = h_m()->can_be_statically_bound();
 117   } else {
 118     // Have to use a conservative value in this case.
 119     _can_be_statically_bound = false;
 120   }
 121 
 122   // Adjust the definition of this condition to be more useful:
 123   // %%% take these conditions into account in vtable generation
 124   if (!_can_be_statically_bound && h_m()->is_private())
 125     _can_be_statically_bound = true;
 126   if (_can_be_statically_bound && h_m()->is_abstract())
 127     _can_be_statically_bound = false;
 128 
 129   // generating _signature may allow GC and therefore move m.
 130   // These fields are always filled in.
 131   _name = env->get_symbol(h_m()->name());
 132   ciSymbol* sig_symbol = env->get_symbol(h_m()->signature());
 133   constantPoolHandle cpool = h_m()->constants();
 134   _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
 135   _method_data = NULL;
 136   _nmethod_age = h_m()->nmethod_age();
 137   // Take a snapshot of these values, so they will be commensurate with the MDO.
 138   if (ProfileInterpreter || TieredCompilation) {
 139     int invcnt = h_m()->interpreter_invocation_count();
 140     // if the value overflowed report it as max int
 141     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
 142     _interpreter_throwout_count   = h_m()->interpreter_throwout_count();
 143   } else {
 144     _interpreter_invocation_count = 0;
 145     _interpreter_throwout_count = 0;
 146   }
 147   if (_interpreter_invocation_count == 0)
 148     _interpreter_invocation_count = 1;
 149   _instructions_size = -1;
 150 #ifdef ASSERT
 151   if (ReplayCompiles) {
 152     ciReplay::initialize(this);
 153   }
 154 #endif
 155 }
 156 
 157 
 158 // ------------------------------------------------------------------
 159 // ciMethod::ciMethod
 160 //
 161 // Unloaded method.
 162 ciMethod::ciMethod(ciInstanceKlass* holder,
 163                    ciSymbol*        name,
 164                    ciSymbol*        signature,
 165                    ciInstanceKlass* accessor) :
 166   ciMetadata((Metadata*)NULL),
 167   _name(                   name),
 168   _holder(                 holder),
 169   _method_data(            NULL),
 170   _method_blocks(          NULL),
 171   _intrinsic_id(           vmIntrinsics::_none),
 172   _instructions_size(-1),
 173   _can_be_statically_bound(false),
 174   _liveness(               NULL)
 175 #if defined(COMPILER2)
 176   ,
 177   _flow(                   NULL),
 178   _bcea(                   NULL)
 179 #endif // COMPILER2
 180 {
 181   // Usually holder and accessor are the same type but in some cases
 182   // the holder has the wrong class loader (e.g. invokedynamic call
 183   // sites) so we pass the accessor.
 184   _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
 185 }
 186 
 187 
 188 // ------------------------------------------------------------------
 189 // ciMethod::load_code
 190 //
 191 // Load the bytecodes and exception handler table for this method.
 192 void ciMethod::load_code() {
 193   VM_ENTRY_MARK;
 194   assert(is_loaded(), "only loaded methods have code");
 195 
 196   Method* me = get_Method();
 197   Arena* arena = CURRENT_THREAD_ENV->arena();
 198 
 199   // Load the bytecodes.
 200   _code = (address)arena->Amalloc(code_size());
 201   memcpy(_code, me->code_base(), code_size());
 202 
 203 #if INCLUDE_JVMTI
 204   // Revert any breakpoint bytecodes in ci's copy
 205   if (me->number_of_breakpoints() > 0) {
 206     BreakpointInfo* bp = me->method_holder()->breakpoints();
 207     for (; bp != NULL; bp = bp->next()) {
 208       if (bp->match(me)) {
 209         code_at_put(bp->bci(), bp->orig_bytecode());
 210       }
 211     }
 212   }
 213 #endif
 214 
 215   // And load the exception table.
 216   ExceptionTable exc_table(me);
 217 
 218   // Allocate one extra spot in our list of exceptions.  This
 219   // last entry will be used to represent the possibility that
 220   // an exception escapes the method.  See ciExceptionHandlerStream
 221   // for details.
 222   _exception_handlers =
 223     (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
 224                                          * (_handler_count + 1));
 225   if (_handler_count > 0) {
 226     for (int i=0; i<_handler_count; i++) {
 227       _exception_handlers[i] = new (arena) ciExceptionHandler(
 228                                 holder(),
 229             /* start    */      exc_table.start_pc(i),
 230             /* limit    */      exc_table.end_pc(i),
 231             /* goto pc  */      exc_table.handler_pc(i),
 232             /* cp index */      exc_table.catch_type_index(i));
 233     }
 234   }
 235 
 236   // Put an entry at the end of our list to represent the possibility
 237   // of exceptional exit.
 238   _exception_handlers[_handler_count] =
 239     new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
 240 
 241   if (CIPrintMethodCodes) {
 242     print_codes();
 243   }
 244 }
 245 
 246 
 247 // ------------------------------------------------------------------
 248 // ciMethod::has_linenumber_table
 249 //
 250 // length unknown until decompression
 251 bool    ciMethod::has_linenumber_table() const {
 252   check_is_loaded();
 253   VM_ENTRY_MARK;
 254   return get_Method()->has_linenumber_table();
 255 }
 256 
 257 
 258 // ------------------------------------------------------------------
 259 // ciMethod::compressed_linenumber_table
 260 u_char* ciMethod::compressed_linenumber_table() const {
 261   check_is_loaded();
 262   VM_ENTRY_MARK;
 263   return get_Method()->compressed_linenumber_table();
 264 }
 265 
 266 
 267 // ------------------------------------------------------------------
 268 // ciMethod::line_number_from_bci
 269 int ciMethod::line_number_from_bci(int bci) const {
 270   check_is_loaded();
 271   VM_ENTRY_MARK;
 272   return get_Method()->line_number_from_bci(bci);
 273 }
 274 
 275 
 276 // ------------------------------------------------------------------
 277 // ciMethod::vtable_index
 278 //
 279 // Get the position of this method's entry in the vtable, if any.
 280 int ciMethod::vtable_index() {
 281   check_is_loaded();
 282   assert(holder()->is_linked(), "must be linked");
 283   VM_ENTRY_MARK;
 284   return get_Method()->vtable_index();
 285 }
 286 
 287 
 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   Method* method = get_Method();
 297   address entry = method->native_function();
 298   assert(entry != NULL, "must be valid entry point");
 299   return entry;
 300 }
 301 
 302 
 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_Method());
 311   return Interpreter::entry_for_method(mh);
 312 }
 313 
 314 
 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;
 322 
 323   // Analyze the method to see if monitors are used properly.
 324   VM_ENTRY_MARK;
 325   methodHandle method(THREAD, get_Method());
 326   assert(method->has_monitor_bytecodes(), "should have checked this");
 327 
 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   }
 334 
 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 }
 348 
 349 
 350 // ------------------------------------------------------------------
 351 // ciMethod::get_flow_analysis
 352 ciTypeFlow* ciMethod::get_flow_analysis() {
 353 #if defined(COMPILER2)
 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
 361   ShouldNotReachHere();
 362   return NULL;
 363 #endif // COMPILER2
 364 }
 365 
 366 
 367 // ------------------------------------------------------------------
 368 // ciMethod::get_osr_flow_analysis
 369 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
 370 #if defined(COMPILER2)
 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
 378   ShouldNotReachHere();
 379   return NULL;
 380 #endif // COMPILER2
 381 }
 382 
 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 }
 397 
 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   if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
 406     // Keep all locals live for the user's edification and amusement.
 407     MethodLivenessResult result(_max_locals);
 408     result.set_range(0, _max_locals);
 409     result.set_is_valid();
 410     return result;
 411   }
 412   return raw_liveness_at_bci(bci);
 413 }
 414 
 415 // ciMethod::live_local_oops_at_bci
 416 //
 417 // find all the live oops in the locals array for a particular bci
 418 // Compute what the interpreter believes by using the interpreter
 419 // oopmap generator. This is used as a double check during osr to
 420 // guard against conservative result from MethodLiveness making us
 421 // think a dead oop is live.  MethodLiveness is conservative in the
 422 // sense that it may consider locals to be live which cannot be live,
 423 // like in the case where a local could contain an oop or  a primitive
 424 // along different paths.  In that case the local must be dead when
 425 // those paths merge. Since the interpreter's viewpoint is used when
 426 // gc'ing an interpreter frame we need to use its viewpoint  during
 427 // OSR when loading the locals.
 428 
 429 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
 430   VM_ENTRY_MARK;
 431   InterpreterOopMap mask;
 432   OopMapCache::compute_one_oop_map(get_Method(), bci, &mask);
 433   int mask_size = max_locals();
 434   ResourceBitMap result(mask_size);
 435   int i;
 436   for (i = 0; i < mask_size ; i++ ) {
 437     if (mask.is_oop(i)) result.set_bit(i);
 438   }
 439   return result;
 440 }
 441 
 442 
 443 #ifdef COMPILER1
 444 // ------------------------------------------------------------------
 445 // ciMethod::bci_block_start
 446 //
 447 // Marks all bcis where a new basic block starts
 448 const BitMap& ciMethod::bci_block_start() {
 449   check_is_loaded();
 450   if (_liveness == NULL) {
 451     // Create the liveness analyzer.
 452     Arena* arena = CURRENT_ENV->arena();
 453     _liveness = new (arena) MethodLiveness(arena, this);
 454     _liveness->compute_liveness();
 455   }
 456 
 457   return _liveness->get_bci_block_start();
 458 }
 459 #endif // COMPILER1
 460 
 461 
 462 // ------------------------------------------------------------------
 463 // ciMethod::call_profile_at_bci
 464 //
 465 // Get the ciCallProfile for the invocation of this method.
 466 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
 467 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
 468   ResourceMark rm;
 469   ciCallProfile result;
 470   if (method_data() != NULL && method_data()->is_mature()) {
 471     ciProfileData* data = method_data()->bci_to_data(bci);
 472     if (data != NULL && data->is_CounterData()) {
 473       // Every profiled call site has a counter.
 474       int count = data->as_CounterData()->count();
 475 
 476       if (!data->is_ReceiverTypeData()) {
 477         result._receiver_count[0] = 0;  // that's a definite zero
 478       } else { // ReceiverTypeData is a subclass of CounterData
 479         ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
 480         // In addition, virtual call sites have receiver type information
 481         int receivers_count_total = 0;
 482         int morphism = 0;
 483         // Precompute morphism for the possible fixup
 484         for (uint i = 0; i < call->row_limit(); i++) {
 485           ciKlass* receiver = call->receiver(i);
 486           if (receiver == NULL)  continue;
 487           morphism++;
 488         }
 489         int epsilon = 0;
 490         if (TieredCompilation) {
 491           // For a call, it is assumed that either the type of the receiver(s)
 492           // is recorded or an associated counter is incremented, but not both. With
 493           // tiered compilation, however, both can happen due to the interpreter and
 494           // C1 profiling invocations differently. Address that inconsistency here.
 495           if (morphism == 1 && count > 0) {
 496             epsilon = count;
 497             count = 0;
 498           }
 499         }
 500         for (uint i = 0; i < call->row_limit(); i++) {
 501           ciKlass* receiver = call->receiver(i);
 502           if (receiver == NULL)  continue;
 503           int rcount = call->receiver_count(i) + epsilon;
 504           if (rcount == 0) rcount = 1; // Should be valid value
 505           receivers_count_total += rcount;
 506           // Add the receiver to result data.
 507           result.add_receiver(receiver, rcount);
 508           // If we extend profiling to record methods,
 509           // we will set result._method also.
 510         }
 511         // Determine call site's morphism.
 512         // The call site count is 0 with known morphism (only 1 or 2 receivers)
 513         // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
 514         // The call site count is > 0 in the case of a polymorphic virtual call.
 515         if (morphism > 0 && morphism == result._limit) {
 516            // The morphism <= MorphismLimit.
 517            if ((morphism <  ciCallProfile::MorphismLimit) ||
 518                (morphism == ciCallProfile::MorphismLimit && count == 0)) {
 519 #ifdef ASSERT
 520              if (count > 0) {
 521                this->print_short_name(tty);
 522                tty->print_cr(" @ bci:%d", bci);
 523                this->print_codes();
 524                assert(false, "this call site should not be polymorphic");
 525              }
 526 #endif
 527              result._morphism = morphism;
 528            }
 529         }
 530         // Make the count consistent if this is a call profile. If count is
 531         // zero or less, presume that this is a typecheck profile and
 532         // do nothing.  Otherwise, increase count to be the sum of all
 533         // receiver's counts.
 534         if (count >= 0) {
 535           count += receivers_count_total;
 536         }
 537       }
 538       result._count = count;
 539     }
 540   }
 541   return result;
 542 }
 543 
 544 // ------------------------------------------------------------------
 545 // Add new receiver and sort data by receiver's profile count.
 546 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
 547   // Add new receiver and sort data by receiver's counts when we have space
 548   // for it otherwise replace the less called receiver (less called receiver
 549   // is placed to the last array element which is not used).
 550   // First array's element contains most called receiver.
 551   int i = _limit;
 552   for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
 553     _receiver[i] = _receiver[i-1];
 554     _receiver_count[i] = _receiver_count[i-1];
 555   }
 556   _receiver[i] = receiver;
 557   _receiver_count[i] = receiver_count;
 558   if (_limit < MorphismLimit) _limit++;
 559 }
 560 
 561 
 562 void ciMethod::assert_virtual_call_type_ok(int bci) {
 563   assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
 564          java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 565 }
 566 
 567 void ciMethod::assert_call_type_ok(int bci) {
 568   assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
 569          java_code_at_bci(bci) == Bytecodes::_invokespecial ||
 570          java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 571 }
 572 
 573 /**
 574  * Check whether profiling provides a type for the argument i to the
 575  * call at bci bci
 576  *
 577  * @param [in]bci         bci of the call
 578  * @param [in]i           argument number
 579  * @param [out]type       profiled type of argument, NULL if none
 580  * @param [out]ptr_kind   whether always null, never null or maybe null
 581  * @return                true if profiling exists
 582  *
 583  */
 584 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 585   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 586     ciProfileData* data = method_data()->bci_to_data(bci);
 587     if (data != NULL) {
 588       if (data->is_VirtualCallTypeData()) {
 589         assert_virtual_call_type_ok(bci);
 590         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 591         if (i >= call->number_of_arguments()) {
 592           return false;
 593         }
 594         type = call->valid_argument_type(i);
 595         ptr_kind = call->argument_ptr_kind(i);
 596         return true;
 597       } else if (data->is_CallTypeData()) {
 598         assert_call_type_ok(bci);
 599         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 600         if (i >= call->number_of_arguments()) {
 601           return false;
 602         }
 603         type = call->valid_argument_type(i);
 604         ptr_kind = call->argument_ptr_kind(i);
 605         return true;
 606       }
 607     }
 608   }
 609   return false;
 610 }
 611 
 612 /**
 613  * Check whether profiling provides a type for the return value from
 614  * the call at bci bci
 615  *
 616  * @param [in]bci         bci of the call
 617  * @param [out]type       profiled type of argument, NULL if none
 618  * @param [out]ptr_kind   whether always null, never null or maybe null
 619  * @return                true if profiling exists
 620  *
 621  */
 622 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 623   if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
 624     ciProfileData* data = method_data()->bci_to_data(bci);
 625     if (data != NULL) {
 626       if (data->is_VirtualCallTypeData()) {
 627         assert_virtual_call_type_ok(bci);
 628         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 629         if (call->has_return()) {
 630           type = call->valid_return_type();
 631           ptr_kind = call->return_ptr_kind();
 632           return true;
 633         }
 634       } else if (data->is_CallTypeData()) {
 635         assert_call_type_ok(bci);
 636         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 637         if (call->has_return()) {
 638           type = call->valid_return_type();
 639           ptr_kind = call->return_ptr_kind();
 640         }
 641         return true;
 642       }
 643     }
 644   }
 645   return false;
 646 }
 647 
 648 /**
 649  * Check whether profiling provides a type for the parameter i
 650  *
 651  * @param [in]i           parameter number
 652  * @param [out]type       profiled type of parameter, NULL if none
 653  * @param [out]ptr_kind   whether always null, never null or maybe null
 654  * @return                true if profiling exists
 655  *
 656  */
 657 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 658   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 659     ciParametersTypeData* parameters = method_data()->parameters_type_data();
 660     if (parameters != NULL && i < parameters->number_of_parameters()) {
 661       type = parameters->valid_parameter_type(i);
 662       ptr_kind = parameters->parameter_ptr_kind(i);
 663       return true;
 664     }
 665   }
 666   return false;
 667 }
 668 
 669 
 670 // ------------------------------------------------------------------
 671 // ciMethod::find_monomorphic_target
 672 //
 673 // Given a certain calling environment, find the monomorphic target
 674 // for the call.  Return NULL if the call is not monomorphic in
 675 // its calling environment, or if there are only abstract methods.
 676 // The returned method is never abstract.
 677 // Note: If caller uses a non-null result, it must inform dependencies
 678 // via assert_unique_concrete_method or assert_leaf_type.
 679 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
 680                                             ciInstanceKlass* callee_holder,
 681                                             ciInstanceKlass* actual_recv,
 682                                             bool check_access) {
 683   check_is_loaded();
 684 
 685   if (actual_recv->is_interface()) {
 686     // %%% We cannot trust interface types, yet.  See bug 6312651.
 687     return NULL;
 688   }
 689 
 690   ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access);
 691   if (root_m == NULL) {
 692     // Something went wrong looking up the actual receiver method.
 693     return NULL;
 694   }
 695   assert(!root_m->is_abstract(), "resolve_invoke promise");
 696 
 697   // Make certain quick checks even if UseCHA is false.
 698 
 699   // Is it private or final?
 700   if (root_m->can_be_statically_bound()) {
 701     return root_m;
 702   }
 703 
 704   if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
 705     // Easy case.  There is no other place to put a method, so don't bother
 706     // to go through the VM_ENTRY_MARK and all the rest.
 707     return root_m;
 708   }
 709 
 710   // Array methods (clone, hashCode, etc.) are always statically bound.
 711   // If we were to see an array type here, we'd return root_m.
 712   // However, this method processes only ciInstanceKlasses.  (See 4962591.)
 713   // The inline_native_clone intrinsic narrows Object to T[] properly,
 714   // so there is no need to do the same job here.
 715 
 716   if (!UseCHA)  return NULL;
 717 
 718   VM_ENTRY_MARK;
 719 
 720   // Disable CHA for default methods for now
 721   if (root_m->get_Method()->is_default_method()) {
 722     return NULL;
 723   }
 724 
 725   methodHandle target;
 726   {
 727     MutexLocker locker(Compile_lock);
 728     Klass* context = actual_recv->get_Klass();
 729     target = Dependencies::find_unique_concrete_method(context,
 730                                                        root_m->get_Method());
 731     // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
 732   }
 733 
 734 #ifndef PRODUCT
 735   if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
 736     tty->print("found a non-root unique target method");
 737     tty->print_cr("  context = %s", actual_recv->get_Klass()->external_name());
 738     tty->print("  method  = ");
 739     target->print_short_name(tty);
 740     tty->cr();
 741   }
 742 #endif //PRODUCT
 743 
 744   if (target() == NULL) {
 745     return NULL;
 746   }
 747   if (target() == root_m->get_Method()) {
 748     return root_m;
 749   }
 750   if (!root_m->is_public() &&
 751       !root_m->is_protected()) {
 752     // If we are going to reason about inheritance, it's easiest
 753     // if the method in question is public, protected, or private.
 754     // If the answer is not root_m, it is conservatively correct
 755     // to return NULL, even if the CHA encountered irrelevant
 756     // methods in other packages.
 757     // %%% TO DO: Work out logic for package-private methods
 758     // with the same name but different vtable indexes.
 759     return NULL;
 760   }
 761   return CURRENT_THREAD_ENV->get_method(target());
 762 }
 763 
 764 // ------------------------------------------------------------------
 765 // ciMethod::resolve_invoke
 766 //
 767 // Given a known receiver klass, find the target for the call.
 768 // Return NULL if the call has no target or the target is abstract.
 769 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access) {
 770    check_is_loaded();
 771    VM_ENTRY_MARK;
 772 
 773    Klass* caller_klass = caller->get_Klass();
 774    Klass* recv         = exact_receiver->get_Klass();
 775    Klass* resolved     = holder()->get_Klass();
 776    Symbol* h_name      = name()->get_symbol();
 777    Symbol* h_signature = signature()->get_symbol();
 778 
 779    LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
 780                       check_access ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
 781    methodHandle m;
 782    // Only do exact lookup if receiver klass has been linked.  Otherwise,
 783    // the vtable has not been setup, and the LinkResolver will fail.
 784    if (recv->is_array_klass()
 785         ||
 786        (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
 787      if (holder()->is_interface()) {
 788        m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
 789      } else {
 790        m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
 791      }
 792    }
 793 
 794    if (m.is_null()) {
 795      // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
 796      return NULL;
 797    }
 798 
 799    ciMethod* result = this;
 800    if (m() != get_Method()) {
 801      result = CURRENT_THREAD_ENV->get_method(m());
 802    }
 803 
 804    // Don't return abstract methods because they aren't
 805    // optimizable or interesting.
 806    if (result->is_abstract()) {
 807      return NULL;
 808    } else {
 809      return result;
 810    }
 811 }
 812 
 813 // ------------------------------------------------------------------
 814 // ciMethod::resolve_vtable_index
 815 //
 816 // Given a known receiver klass, find the vtable index for the call.
 817 // Return Method::invalid_vtable_index if the vtable_index is unknown.
 818 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
 819    check_is_loaded();
 820 
 821    int vtable_index = Method::invalid_vtable_index;
 822    // Only do lookup if receiver klass has been linked.  Otherwise,
 823    // the vtable has not been setup, and the LinkResolver will fail.
 824    if (!receiver->is_interface()
 825        && (!receiver->is_instance_klass() ||
 826            receiver->as_instance_klass()->is_linked())) {
 827      VM_ENTRY_MARK;
 828 
 829      Klass* caller_klass = caller->get_Klass();
 830      Klass* recv         = receiver->get_Klass();
 831      Symbol* h_name = name()->get_symbol();
 832      Symbol* h_signature = signature()->get_symbol();
 833 
 834      LinkInfo link_info(recv, h_name, h_signature, caller_klass);
 835      vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
 836      if (vtable_index == Method::nonvirtual_vtable_index) {
 837        // A statically bound method.  Return "no such index".
 838        vtable_index = Method::invalid_vtable_index;
 839      }
 840    }
 841 
 842    return vtable_index;
 843 }
 844 
 845 // ------------------------------------------------------------------
 846 // ciMethod::interpreter_call_site_count
 847 int ciMethod::interpreter_call_site_count(int bci) {
 848   if (method_data() != NULL) {
 849     ResourceMark rm;
 850     ciProfileData* data = method_data()->bci_to_data(bci);
 851     if (data != NULL && data->is_CounterData()) {
 852       return scale_count(data->as_CounterData()->count());
 853     }
 854   }
 855   return -1;  // unknown
 856 }
 857 
 858 // ------------------------------------------------------------------
 859 // ciMethod::get_field_at_bci
 860 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
 861   ciBytecodeStream iter(this);
 862   iter.reset_to_bci(bci);
 863   iter.next();
 864   return iter.get_field(will_link);
 865 }
 866 
 867 // ------------------------------------------------------------------
 868 // ciMethod::get_method_at_bci
 869 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
 870   ciBytecodeStream iter(this);
 871   iter.reset_to_bci(bci);
 872   iter.next();
 873   return iter.get_method(will_link, declared_signature);
 874 }
 875 
 876 // ------------------------------------------------------------------
 877 // Adjust a CounterData count to be commensurate with
 878 // interpreter_invocation_count.  If the MDO exists for
 879 // only 25% of the time the method exists, then the
 880 // counts in the MDO should be scaled by 4X, so that
 881 // they can be usefully and stably compared against the
 882 // invocation counts in methods.
 883 int ciMethod::scale_count(int count, float prof_factor) {
 884   if (count > 0 && method_data() != NULL) {
 885     int counter_life;
 886     int method_life = interpreter_invocation_count();
 887     if (TieredCompilation) {
 888       // In tiered the MDO's life is measured directly, so just use the snapshotted counters
 889       counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
 890     } else {
 891       int current_mileage = method_data()->current_mileage();
 892       int creation_mileage = method_data()->creation_mileage();
 893       counter_life = current_mileage - creation_mileage;
 894     }
 895 
 896     // counter_life due to backedge_counter could be > method_life
 897     if (counter_life > method_life)
 898       counter_life = method_life;
 899     if (0 < counter_life && counter_life <= method_life) {
 900       count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
 901       count = (count > 0) ? count : 1;
 902     }
 903   }
 904   return count;
 905 }
 906 
 907 
 908 // ------------------------------------------------------------------
 909 // ciMethod::is_special_get_caller_class_method
 910 //
 911 bool ciMethod::is_ignored_by_security_stack_walk() const {
 912   check_is_loaded();
 913   VM_ENTRY_MARK;
 914   return get_Method()->is_ignored_by_security_stack_walk();
 915 }
 916 
 917 
 918 // ------------------------------------------------------------------
 919 // invokedynamic support
 920 
 921 // ------------------------------------------------------------------
 922 // ciMethod::is_method_handle_intrinsic
 923 //
 924 // Return true if the method is an instance of the JVM-generated
 925 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
 926 bool ciMethod::is_method_handle_intrinsic() const {
 927   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 928   return (MethodHandles::is_signature_polymorphic(iid) &&
 929           MethodHandles::is_signature_polymorphic_intrinsic(iid));
 930 }
 931 
 932 // ------------------------------------------------------------------
 933 // ciMethod::is_compiled_lambda_form
 934 //
 935 // Return true if the method is a generated MethodHandle adapter.
 936 // These are built by Java code.
 937 bool ciMethod::is_compiled_lambda_form() const {
 938   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 939   return iid == vmIntrinsics::_compiledLambdaForm;
 940 }
 941 
 942 // ------------------------------------------------------------------
 943 // ciMethod::is_object_initializer
 944 //
 945 bool ciMethod::is_object_initializer() const {
 946    return name() == ciSymbol::object_initializer_name();
 947 }
 948 
 949 // ------------------------------------------------------------------
 950 // ciMethod::has_member_arg
 951 //
 952 // Return true if the method is a linker intrinsic like _linkToVirtual.
 953 // These are built by the JVM.
 954 bool ciMethod::has_member_arg() const {
 955   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 956   return (MethodHandles::is_signature_polymorphic(iid) &&
 957           MethodHandles::has_member_arg(iid));
 958 }
 959 
 960 // ------------------------------------------------------------------
 961 // ciMethod::ensure_method_data
 962 //
 963 // Generate new MethodData* objects at compile time.
 964 // Return true if allocation was successful or no MDO is required.
 965 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
 966   EXCEPTION_CONTEXT;
 967   if (is_native() || is_abstract() || h_m()->is_accessor()) {
 968     return true;
 969   }
 970   if (h_m()->method_data() == NULL) {
 971     Method::build_interpreter_method_data(h_m, THREAD);
 972     if (HAS_PENDING_EXCEPTION) {
 973       CLEAR_PENDING_EXCEPTION;
 974     }
 975   }
 976   if (h_m()->method_data() != NULL) {
 977     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
 978     _method_data->load_data();
 979     return true;
 980   } else {
 981     _method_data = CURRENT_ENV->get_empty_methodData();
 982     return false;
 983   }
 984 }
 985 
 986 // public, retroactive version
 987 bool ciMethod::ensure_method_data() {
 988   bool result = true;
 989   if (_method_data == NULL || _method_data->is_empty()) {
 990     GUARDED_VM_ENTRY({
 991       result = ensure_method_data(get_Method());
 992     });
 993   }
 994   return result;
 995 }
 996 
 997 
 998 // ------------------------------------------------------------------
 999 // ciMethod::method_data
1000 //
1001 ciMethodData* ciMethod::method_data() {
1002   if (_method_data != NULL) {
1003     return _method_data;
1004   }
1005   VM_ENTRY_MARK;
1006   ciEnv* env = CURRENT_ENV;
1007   Thread* my_thread = JavaThread::current();
1008   methodHandle h_m(my_thread, get_Method());
1009 
1010   if (h_m()->method_data() != NULL) {
1011     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1012     _method_data->load_data();
1013   } else {
1014     _method_data = CURRENT_ENV->get_empty_methodData();
1015   }
1016   return _method_data;
1017 
1018 }
1019 
1020 // ------------------------------------------------------------------
1021 // ciMethod::method_data_or_null
1022 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1023 // NULL otherwise.
1024 ciMethodData* ciMethod::method_data_or_null() {
1025   ciMethodData *md = method_data();
1026   if (md->is_empty()) {
1027     return NULL;
1028   }
1029   return md;
1030 }
1031 
1032 // ------------------------------------------------------------------
1033 // ciMethod::ensure_method_counters
1034 //
1035 MethodCounters* ciMethod::ensure_method_counters() {
1036   check_is_loaded();
1037   VM_ENTRY_MARK;
1038   methodHandle mh(THREAD, get_Method());
1039   MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1040   return method_counters;
1041 }
1042 
1043 // ------------------------------------------------------------------
1044 // ciMethod::has_option
1045 //
1046 bool ciMethod::has_option(const char* option) {
1047   check_is_loaded();
1048   VM_ENTRY_MARK;
1049   methodHandle mh(THREAD, get_Method());
1050   return CompilerOracle::has_option_string(mh, option);
1051 }
1052 
1053 // ------------------------------------------------------------------
1054 // ciMethod::has_option_value
1055 //
1056 bool ciMethod::has_option_value(const char* option, double& value) {
1057   check_is_loaded();
1058   VM_ENTRY_MARK;
1059   methodHandle mh(THREAD, get_Method());
1060   return CompilerOracle::has_option_value(mh, option, value);
1061 }
1062 // ------------------------------------------------------------------
1063 // ciMethod::can_be_compiled
1064 //
1065 // Have previous compilations of this method succeeded?
1066 bool ciMethod::can_be_compiled() {
1067   check_is_loaded();
1068   ciEnv* env = CURRENT_ENV;
1069   if (is_c1_compile(env->comp_level())) {
1070     return _is_c1_compilable;
1071   }
1072   return _is_c2_compilable;
1073 }
1074 
1075 // ------------------------------------------------------------------
1076 // ciMethod::set_not_compilable
1077 //
1078 // Tell the VM that this method cannot be compiled at all.
1079 void ciMethod::set_not_compilable(const char* reason) {
1080   check_is_loaded();
1081   VM_ENTRY_MARK;
1082   ciEnv* env = CURRENT_ENV;
1083   if (is_c1_compile(env->comp_level())) {
1084     _is_c1_compilable = false;
1085   } else {
1086     _is_c2_compilable = false;
1087   }
1088   get_Method()->set_not_compilable(env->comp_level(), true, reason);
1089 }
1090 
1091 // ------------------------------------------------------------------
1092 // ciMethod::can_be_osr_compiled
1093 //
1094 // Have previous compilations of this method succeeded?
1095 //
1096 // Implementation note: the VM does not currently keep track
1097 // of failed OSR compilations per bci.  The entry_bci parameter
1098 // is currently unused.
1099 bool ciMethod::can_be_osr_compiled(int entry_bci) {
1100   check_is_loaded();
1101   VM_ENTRY_MARK;
1102   ciEnv* env = CURRENT_ENV;
1103   return !get_Method()->is_not_osr_compilable(env->comp_level());
1104 }
1105 
1106 // ------------------------------------------------------------------
1107 // ciMethod::has_compiled_code
1108 bool ciMethod::has_compiled_code() {
1109   return instructions_size() > 0;
1110 }
1111 
1112 int ciMethod::comp_level() {
1113   check_is_loaded();
1114   VM_ENTRY_MARK;
1115   CompiledMethod* nm = get_Method()->code();
1116   if (nm != NULL) return nm->comp_level();
1117   return 0;
1118 }
1119 
1120 int ciMethod::highest_osr_comp_level() {
1121   check_is_loaded();
1122   VM_ENTRY_MARK;
1123   return get_Method()->highest_osr_comp_level();
1124 }
1125 
1126 // ------------------------------------------------------------------
1127 // ciMethod::code_size_for_inlining
1128 //
1129 // Code size for inlining decisions.  This method returns a code
1130 // size of 1 for methods which has the ForceInline annotation.
1131 int ciMethod::code_size_for_inlining() {
1132   check_is_loaded();
1133   if (get_Method()->force_inline()) {
1134     return 1;
1135   }
1136   return code_size();
1137 }
1138 
1139 // ------------------------------------------------------------------
1140 // ciMethod::instructions_size
1141 //
1142 // This is a rough metric for "fat" methods, compared before inlining
1143 // with InlineSmallCode.  The CodeBlob::code_size accessor includes
1144 // junk like exception handler, stubs, and constant table, which are
1145 // not highly relevant to an inlined method.  So we use the more
1146 // specific accessor nmethod::insts_size.
1147 int ciMethod::instructions_size() {
1148   if (_instructions_size == -1) {
1149     GUARDED_VM_ENTRY(
1150                      CompiledMethod* code = get_Method()->code();
1151                      if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1152                        _instructions_size = code->insts_end() - code->verified_entry_point();
1153                      } else {
1154                        _instructions_size = 0;
1155                      }
1156                      );
1157   }
1158   return _instructions_size;
1159 }
1160 
1161 // ------------------------------------------------------------------
1162 // ciMethod::log_nmethod_identity
1163 void ciMethod::log_nmethod_identity(xmlStream* log) {
1164   GUARDED_VM_ENTRY(
1165     CompiledMethod* code = get_Method()->code();
1166     if (code != NULL) {
1167       code->log_identity(log);
1168     }
1169   )
1170 }
1171 
1172 // ------------------------------------------------------------------
1173 // ciMethod::is_not_reached
1174 bool ciMethod::is_not_reached(int bci) {
1175   check_is_loaded();
1176   VM_ENTRY_MARK;
1177   return Interpreter::is_not_reached(
1178                methodHandle(THREAD, get_Method()), bci);
1179 }
1180 
1181 // ------------------------------------------------------------------
1182 // ciMethod::was_never_executed
1183 bool ciMethod::was_executed_more_than(int times) {
1184   VM_ENTRY_MARK;
1185   return get_Method()->was_executed_more_than(times);
1186 }
1187 
1188 // ------------------------------------------------------------------
1189 // ciMethod::has_unloaded_classes_in_signature
1190 bool ciMethod::has_unloaded_classes_in_signature() {
1191   VM_ENTRY_MARK;
1192   {
1193     EXCEPTION_MARK;
1194     methodHandle m(THREAD, get_Method());
1195     bool has_unloaded = Method::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
1196     if( HAS_PENDING_EXCEPTION ) {
1197       CLEAR_PENDING_EXCEPTION;
1198       return true;     // Declare that we may have unloaded classes
1199     }
1200     return has_unloaded;
1201   }
1202 }
1203 
1204 // ------------------------------------------------------------------
1205 // ciMethod::is_klass_loaded
1206 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1207   VM_ENTRY_MARK;
1208   return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1209 }
1210 
1211 // ------------------------------------------------------------------
1212 // ciMethod::check_call
1213 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1214   // This method is used only in C2 from InlineTree::ok_to_inline,
1215   // and is only used under -Xcomp.
1216   // It appears to fail when applied to an invokeinterface call site.
1217   // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1218   VM_ENTRY_MARK;
1219   {
1220     EXCEPTION_MARK;
1221     HandleMark hm(THREAD);
1222     constantPoolHandle pool (THREAD, get_Method()->constants());
1223     Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1224     methodHandle spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1225     if (HAS_PENDING_EXCEPTION) {
1226       CLEAR_PENDING_EXCEPTION;
1227       return false;
1228     } else {
1229       return (spec_method->is_static() == is_static);
1230     }
1231   }
1232   return false;
1233 }
1234 
1235 // ------------------------------------------------------------------
1236 // ciMethod::profile_aging
1237 //
1238 // Should the method be compiled with an age counter?
1239 bool ciMethod::profile_aging() const {
1240   return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1241                           !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1242 }
1243 // ------------------------------------------------------------------
1244 // ciMethod::print_codes
1245 //
1246 // Print the bytecodes for this method.
1247 void ciMethod::print_codes_on(outputStream* st) {
1248   check_is_loaded();
1249   GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1250 }
1251 
1252 
1253 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1254   check_is_loaded(); \
1255   VM_ENTRY_MARK; \
1256   return get_Method()->flag_accessor(); \
1257 }
1258 
1259 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }
1260 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1261 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }
1262 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }
1263 bool ciMethod::is_getter      () const {         FETCH_FLAG_FROM_VM(is_getter); }
1264 bool ciMethod::is_setter      () const {         FETCH_FLAG_FROM_VM(is_setter); }
1265 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }
1266 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }
1267 
1268 bool ciMethod::is_boxing_method() const {
1269   if (holder()->is_box_klass()) {
1270     switch (intrinsic_id()) {
1271       case vmIntrinsics::_Boolean_valueOf:
1272       case vmIntrinsics::_Byte_valueOf:
1273       case vmIntrinsics::_Character_valueOf:
1274       case vmIntrinsics::_Short_valueOf:
1275       case vmIntrinsics::_Integer_valueOf:
1276       case vmIntrinsics::_Long_valueOf:
1277       case vmIntrinsics::_Float_valueOf:
1278       case vmIntrinsics::_Double_valueOf:
1279         return true;
1280       default:
1281         return false;
1282     }
1283   }
1284   return false;
1285 }
1286 
1287 bool ciMethod::is_unboxing_method() const {
1288   if (holder()->is_box_klass()) {
1289     switch (intrinsic_id()) {
1290       case vmIntrinsics::_booleanValue:
1291       case vmIntrinsics::_byteValue:
1292       case vmIntrinsics::_charValue:
1293       case vmIntrinsics::_shortValue:
1294       case vmIntrinsics::_intValue:
1295       case vmIntrinsics::_longValue:
1296       case vmIntrinsics::_floatValue:
1297       case vmIntrinsics::_doubleValue:
1298         return true;
1299       default:
1300         return false;
1301     }
1302   }
1303   return false;
1304 }
1305 
1306 BCEscapeAnalyzer  *ciMethod::get_bcea() {
1307 #ifdef COMPILER2
1308   if (_bcea == NULL) {
1309     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1310   }
1311   return _bcea;
1312 #else // COMPILER2
1313   ShouldNotReachHere();
1314   return NULL;
1315 #endif // COMPILER2
1316 }
1317 
1318 ciMethodBlocks  *ciMethod::get_method_blocks() {
1319   Arena *arena = CURRENT_ENV->arena();
1320   if (_method_blocks == NULL) {
1321     _method_blocks = new (arena) ciMethodBlocks(arena, this);
1322   }
1323   return _method_blocks;
1324 }
1325 
1326 #undef FETCH_FLAG_FROM_VM
1327 
1328 void ciMethod::dump_name_as_ascii(outputStream* st) {
1329   Method* method = get_Method();
1330   st->print("%s %s %s",
1331             method->klass_name()->as_quoted_ascii(),
1332             method->name()->as_quoted_ascii(),
1333             method->signature()->as_quoted_ascii());
1334 }
1335 
1336 void ciMethod::dump_replay_data(outputStream* st) {
1337   ResourceMark rm;
1338   Method* method = get_Method();
1339   MethodCounters* mcs = method->method_counters();
1340   st->print("ciMethod ");
1341   dump_name_as_ascii(st);
1342   st->print_cr(" %d %d %d %d %d",
1343                mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1344                mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1345                interpreter_invocation_count(),
1346                interpreter_throwout_count(),
1347                _instructions_size);
1348 }
1349 
1350 // ------------------------------------------------------------------
1351 // ciMethod::print_codes
1352 //
1353 // Print a range of the bytecodes for this method.
1354 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1355   check_is_loaded();
1356   GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1357 }
1358 
1359 // ------------------------------------------------------------------
1360 // ciMethod::print_name
1361 //
1362 // Print the name of this method, including signature and some flags.
1363 void ciMethod::print_name(outputStream* st) {
1364   check_is_loaded();
1365   GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1366 }
1367 
1368 // ------------------------------------------------------------------
1369 // ciMethod::print_short_name
1370 //
1371 // Print the name of this method, without signature.
1372 void ciMethod::print_short_name(outputStream* st) {
1373   if (is_loaded()) {
1374     GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1375   } else {
1376     // Fall back if method is not loaded.
1377     holder()->print_name_on(st);
1378     st->print("::");
1379     name()->print_symbol_on(st);
1380     if (WizardMode)
1381       signature()->as_symbol()->print_symbol_on(st);
1382   }
1383 }
1384 
1385 // ------------------------------------------------------------------
1386 // ciMethod::print_impl
1387 //
1388 // Implementation of the print method.
1389 void ciMethod::print_impl(outputStream* st) {
1390   ciMetadata::print_impl(st);
1391   st->print(" name=");
1392   name()->print_symbol_on(st);
1393   st->print(" holder=");
1394   holder()->print_name_on(st);
1395   st->print(" signature=");
1396   signature()->as_symbol()->print_symbol_on(st);
1397   if (is_loaded()) {
1398     st->print(" loaded=true");
1399     st->print(" arg_size=%d", arg_size());
1400     st->print(" flags=");
1401     flags().print_member_flags(st);
1402   } else {
1403     st->print(" loaded=false");
1404   }
1405 }
1406 
1407 // ------------------------------------------------------------------
1408 
1409 static BasicType erase_to_word_type(BasicType bt) {
1410   if (is_subword_type(bt)) return T_INT;
1411   if (bt == T_ARRAY)       return T_OBJECT;
1412   return bt;
1413 }
1414 
1415 static bool basic_types_match(ciType* t1, ciType* t2) {
1416   if (t1 == t2)  return true;
1417   return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1418 }
1419 
1420 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1421   bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1422                                   !resolved_method->is_method_handle_intrinsic();
1423 
1424   if (!invoke_through_mh_intrinsic) {
1425     // Method name & descriptor should stay the same.
1426     // Signatures may reference unloaded types and thus they may be not strictly equal.
1427     ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1428     ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1429 
1430     return (declared_method->name()->equals(resolved_method->name())) &&
1431            (declared_signature->equals(resolved_signature));
1432   }
1433 
1434   ciMethod* linker = declared_method;
1435   ciMethod* target = resolved_method;
1436   // Linkers have appendix argument which is not passed to callee.
1437   int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1438   if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1439     return false; // argument slot count mismatch
1440   }
1441 
1442   ciSignature* linker_sig = linker->signature();
1443   ciSignature* target_sig = target->signature();
1444 
1445   if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1446       target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1447     return false; // argument count mismatch
1448   }
1449 
1450   int sbase = 0, rbase = 0;
1451   switch (linker->intrinsic_id()) {
1452     case vmIntrinsics::_linkToVirtual:
1453     case vmIntrinsics::_linkToInterface:
1454     case vmIntrinsics::_linkToSpecial: {
1455       if (target->is_static()) {
1456         return false;
1457       }
1458       if (linker_sig->type_at(0)->is_primitive_type()) {
1459         return false;  // receiver should be an oop
1460       }
1461       sbase = 1; // skip receiver
1462       break;
1463     }
1464     case vmIntrinsics::_linkToStatic: {
1465       if (!target->is_static()) {
1466         return false;
1467       }
1468       break;
1469     }
1470     case vmIntrinsics::_invokeBasic: {
1471       if (target->is_static()) {
1472         if (target_sig->type_at(0)->is_primitive_type()) {
1473           return false; // receiver should be an oop
1474         }
1475         rbase = 1; // skip receiver
1476       }
1477       break;
1478     }
1479     default:
1480       break;
1481   }
1482   assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1483   int arg_count = target_sig->count() - rbase;
1484   for (int i = 0; i < arg_count; i++) {
1485     if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1486       return false;
1487     }
1488   }
1489   // Only check the return type if the symbolic info has non-void return type.
1490   // I.e. the return value of the resolved method can be dropped.
1491   if (!linker->return_type()->is_void() &&
1492       !basic_types_match(linker->return_type(), target->return_type())) {
1493     return false;
1494   }
1495   return true; // no mismatch found
1496 }
1497 
1498 // ------------------------------------------------------------------