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 "runtime/handles.inline.hpp"
  50 #include "utilities/bitMap.inline.hpp"
  51 #include "utilities/xmlstream.hpp"
  52 #ifdef COMPILER2
  53 #include "ci/bcEscapeAnalyzer.hpp"
  54 #include "ci/ciTypeFlow.hpp"
  55 #include "oops/method.hpp"
  56 #endif
  57 
  58 // ciMethod
  59 //
  60 // This class represents a Method* in the HotSpot virtual
  61 // machine.
  62 
  63 
  64 // ------------------------------------------------------------------
  65 // ciMethod::ciMethod
  66 //
  67 // Loaded method.
  68 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
  69   ciMetadata(h_m()),
  70   _holder(holder)
  71 {
  72   assert(h_m() != NULL, "no null method");
  73 
  74   if (LogTouchedMethods) {
  75     h_m()->log_touched(Thread::current());
  76   }
  77   // These fields are always filled in in loaded methods.
  78   _flags = ciFlags(h_m()->access_flags());
  79 
  80   // Easy to compute, so fill them in now.
  81   _max_stack          = h_m()->max_stack();
  82   _max_locals         = h_m()->max_locals();
  83   _code_size          = h_m()->code_size();
  84   _intrinsic_id       = h_m()->intrinsic_id();
  85   _handler_count      = h_m()->exception_table_length();
  86   _size_of_parameters = h_m()->size_of_parameters();
  87   _uses_monitors      = h_m()->access_flags().has_monitor_bytecodes();
  88   _balanced_monitors  = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
  89   _is_c1_compilable   = !h_m()->is_not_c1_compilable();
  90   _is_c2_compilable   = !h_m()->is_not_c2_compilable();
  91   _can_be_parsed      = true;
  92   _has_reserved_stack_access = h_m()->has_reserved_stack_access();
  93   _is_overpass        = h_m()->is_overpass();
  94   // Lazy fields, filled in on demand.  Require allocation.
  95   _code               = NULL;
  96   _exception_handlers = NULL;
  97   _liveness           = NULL;
  98   _method_blocks = NULL;
  99 #if defined(COMPILER2)
 100   _flow               = NULL;
 101   _bcea               = NULL;
 102 #endif // COMPILER2
 103 
 104   ciEnv *env = CURRENT_ENV;
 105   if (env->jvmti_can_hotswap_or_post_breakpoint()) {
 106     // 6328518 check hotswap conditions under the right lock.
 107     MutexLocker locker(Compile_lock);
 108     if (Dependencies::check_evol_method(h_m()) != NULL) {
 109       _is_c1_compilable = false;
 110       _is_c2_compilable = false;
 111       _can_be_parsed = false;
 112     }
 113   } else {
 114     CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
 115   }
 116 
 117   if (h_m()->method_holder()->is_linked()) {
 118     _can_be_statically_bound = h_m()->can_be_statically_bound();
 119   } else {
 120     // Have to use a conservative value in this case.
 121     _can_be_statically_bound = false;
 122   }
 123 
 124   // Adjust the definition of this condition to be more useful:
 125   // %%% take these conditions into account in vtable generation
 126   if (!_can_be_statically_bound && h_m()->is_private())
 127     _can_be_statically_bound = true;
 128   if (_can_be_statically_bound && h_m()->is_abstract())
 129     _can_be_statically_bound = false;
 130 
 131   // generating _signature may allow GC and therefore move m.
 132   // These fields are always filled in.
 133   _name = env->get_symbol(h_m()->name());
 134   ciSymbol* sig_symbol = env->get_symbol(h_m()->signature());
 135   constantPoolHandle cpool = h_m()->constants();
 136   _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
 137   _method_data = NULL;
 138   _nmethod_age = h_m()->nmethod_age();
 139   // Take a snapshot of these values, so they will be commensurate with the MDO.
 140   if (ProfileInterpreter || TieredCompilation) {
 141     int invcnt = h_m()->interpreter_invocation_count();
 142     // if the value overflowed report it as max int
 143     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
 144     _interpreter_throwout_count   = h_m()->interpreter_throwout_count();
 145   } else {
 146     _interpreter_invocation_count = 0;
 147     _interpreter_throwout_count = 0;
 148   }
 149   if (_interpreter_invocation_count == 0)
 150     _interpreter_invocation_count = 1;
 151   _instructions_size = -1;
 152 #ifdef ASSERT
 153   if (ReplayCompiles) {
 154     ciReplay::initialize(this);
 155   }
 156 #endif
 157 }
 158 
 159 
 160 // ------------------------------------------------------------------
 161 // ciMethod::ciMethod
 162 //
 163 // Unloaded method.
 164 ciMethod::ciMethod(ciInstanceKlass* holder,
 165                    ciSymbol*        name,
 166                    ciSymbol*        signature,
 167                    ciInstanceKlass* accessor) :
 168   ciMetadata((Metadata*)NULL),
 169   _name(                   name),
 170   _holder(                 holder),
 171   _method_data(            NULL),
 172   _method_blocks(          NULL),
 173   _intrinsic_id(           vmIntrinsics::_none),
 174   _instructions_size(-1),
 175   _can_be_statically_bound(false),
 176   _liveness(               NULL)
 177 #if defined(COMPILER2)
 178   ,
 179   _flow(                   NULL),
 180   _bcea(                   NULL)
 181 #endif // COMPILER2
 182 {
 183   // Usually holder and accessor are the same type but in some cases
 184   // the holder has the wrong class loader (e.g. invokedynamic call
 185   // sites) so we pass the accessor.
 186   _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
 187 }
 188 
 189 
 190 // ------------------------------------------------------------------
 191 // ciMethod::load_code
 192 //
 193 // Load the bytecodes and exception handler table for this method.
 194 void ciMethod::load_code() {
 195   VM_ENTRY_MARK;
 196   assert(is_loaded(), "only loaded methods have code");
 197 
 198   Method* me = get_Method();
 199   Arena* arena = CURRENT_THREAD_ENV->arena();
 200 
 201   // Load the bytecodes.
 202   _code = (address)arena->Amalloc(code_size());
 203   memcpy(_code, me->code_base(), code_size());
 204 
 205 #if INCLUDE_JVMTI
 206   // Revert any breakpoint bytecodes in ci's copy
 207   if (me->number_of_breakpoints() > 0) {
 208     BreakpointInfo* bp = me->method_holder()->breakpoints();
 209     for (; bp != NULL; bp = bp->next()) {
 210       if (bp->match(me)) {
 211         code_at_put(bp->bci(), bp->orig_bytecode());
 212       }
 213     }
 214   }
 215 #endif
 216 
 217   // And load the exception table.
 218   ExceptionTable exc_table(me);
 219 
 220   // Allocate one extra spot in our list of exceptions.  This
 221   // last entry will be used to represent the possibility that
 222   // an exception escapes the method.  See ciExceptionHandlerStream
 223   // for details.
 224   _exception_handlers =
 225     (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
 226                                          * (_handler_count + 1));
 227   if (_handler_count > 0) {
 228     for (int i=0; i<_handler_count; i++) {
 229       _exception_handlers[i] = new (arena) ciExceptionHandler(
 230                                 holder(),
 231             /* start    */      exc_table.start_pc(i),
 232             /* limit    */      exc_table.end_pc(i),
 233             /* goto pc  */      exc_table.handler_pc(i),
 234             /* cp index */      exc_table.catch_type_index(i));
 235     }
 236   }
 237 
 238   // Put an entry at the end of our list to represent the possibility
 239   // of exceptional exit.
 240   _exception_handlers[_handler_count] =
 241     new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
 242 
 243   if (CIPrintMethodCodes) {
 244     print_codes();
 245   }
 246 }
 247 
 248 
 249 // ------------------------------------------------------------------
 250 // ciMethod::has_linenumber_table
 251 //
 252 // length unknown until decompression
 253 bool    ciMethod::has_linenumber_table() const {
 254   check_is_loaded();
 255   VM_ENTRY_MARK;
 256   return get_Method()->has_linenumber_table();
 257 }
 258 
 259 
 260 // ------------------------------------------------------------------
 261 // ciMethod::compressed_linenumber_table
 262 u_char* ciMethod::compressed_linenumber_table() const {
 263   check_is_loaded();
 264   VM_ENTRY_MARK;
 265   return get_Method()->compressed_linenumber_table();
 266 }
 267 
 268 
 269 // ------------------------------------------------------------------
 270 // ciMethod::line_number_from_bci
 271 int ciMethod::line_number_from_bci(int bci) const {
 272   check_is_loaded();
 273   VM_ENTRY_MARK;
 274   return get_Method()->line_number_from_bci(bci);
 275 }
 276 
 277 
 278 // ------------------------------------------------------------------
 279 // ciMethod::vtable_index
 280 //
 281 // Get the position of this method's entry in the vtable, if any.
 282 int ciMethod::vtable_index() {
 283   check_is_loaded();
 284   assert(holder()->is_linked(), "must be linked");
 285   VM_ENTRY_MARK;
 286   return get_Method()->vtable_index();
 287 }
 288 
 289 
 290 // ------------------------------------------------------------------
 291 // ciMethod::native_entry
 292 //
 293 // Get the address of this method's native code, if any.
 294 address ciMethod::native_entry() {
 295   check_is_loaded();
 296   assert(flags().is_native(), "must be native method");
 297   VM_ENTRY_MARK;
 298   Method* method = get_Method();
 299   address entry = method->native_function();
 300   assert(entry != NULL, "must be valid entry point");
 301   return entry;
 302 }
 303 
 304 
 305 // ------------------------------------------------------------------
 306 // ciMethod::interpreter_entry
 307 //
 308 // Get the entry point for running this method in the interpreter.
 309 address ciMethod::interpreter_entry() {
 310   check_is_loaded();
 311   VM_ENTRY_MARK;
 312   methodHandle mh(THREAD, get_Method());
 313   return Interpreter::entry_for_method(mh);
 314 }
 315 
 316 
 317 // ------------------------------------------------------------------
 318 // ciMethod::uses_balanced_monitors
 319 //
 320 // Does this method use monitors in a strict stack-disciplined manner?
 321 bool ciMethod::has_balanced_monitors() {
 322   check_is_loaded();
 323   if (_balanced_monitors) return true;
 324 
 325   // Analyze the method to see if monitors are used properly.
 326   VM_ENTRY_MARK;
 327   methodHandle method(THREAD, get_Method());
 328   assert(method->has_monitor_bytecodes(), "should have checked this");
 329 
 330   // Check to see if a previous compilation computed the
 331   // monitor-matching analysis.
 332   if (method->guaranteed_monitor_matching()) {
 333     _balanced_monitors = true;
 334     return true;
 335   }
 336 
 337   {
 338     EXCEPTION_MARK;
 339     ResourceMark rm(THREAD);
 340     GeneratePairingInfo gpi(method);
 341     gpi.compute_map(CATCH);
 342     if (!gpi.monitor_safe()) {
 343       return false;
 344     }
 345     method->set_guaranteed_monitor_matching();
 346     _balanced_monitors = true;
 347   }
 348   return true;
 349 }
 350 
 351 
 352 // ------------------------------------------------------------------
 353 // ciMethod::get_flow_analysis
 354 ciTypeFlow* ciMethod::get_flow_analysis() {
 355 #if defined(COMPILER2)
 356   if (_flow == NULL) {
 357     ciEnv* env = CURRENT_ENV;
 358     _flow = new (env->arena()) ciTypeFlow(env, this);
 359     _flow->do_flow();
 360   }
 361   return _flow;
 362 #else // COMPILER2
 363   ShouldNotReachHere();
 364   return NULL;
 365 #endif // COMPILER2
 366 }
 367 
 368 
 369 // ------------------------------------------------------------------
 370 // ciMethod::get_osr_flow_analysis
 371 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
 372 #if defined(COMPILER2)
 373   // OSR entry points are always place after a call bytecode of some sort
 374   assert(osr_bci >= 0, "must supply valid OSR entry point");
 375   ciEnv* env = CURRENT_ENV;
 376   ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
 377   flow->do_flow();
 378   return flow;
 379 #else // COMPILER2
 380   ShouldNotReachHere();
 381   return NULL;
 382 #endif // COMPILER2
 383 }
 384 
 385 // ------------------------------------------------------------------
 386 // ciMethod::raw_liveness_at_bci
 387 //
 388 // Which local variables are live at a specific bci?
 389 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
 390   check_is_loaded();
 391   if (_liveness == NULL) {
 392     // Create the liveness analyzer.
 393     Arena* arena = CURRENT_ENV->arena();
 394     _liveness = new (arena) MethodLiveness(arena, this);
 395     _liveness->compute_liveness();
 396   }
 397   return _liveness->get_liveness_at(bci);
 398 }
 399 
 400 // ------------------------------------------------------------------
 401 // ciMethod::liveness_at_bci
 402 //
 403 // Which local variables are live at a specific bci?  When debugging
 404 // will return true for all locals in some cases to improve debug
 405 // information.
 406 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
 407   if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
 408     // Keep all locals live for the user's edification and amusement.
 409     MethodLivenessResult result(_max_locals);
 410     result.set_range(0, _max_locals);
 411     result.set_is_valid();
 412     return result;
 413   }
 414   return raw_liveness_at_bci(bci);
 415 }
 416 
 417 // ciMethod::live_local_oops_at_bci
 418 //
 419 // find all the live oops in the locals array for a particular bci
 420 // Compute what the interpreter believes by using the interpreter
 421 // oopmap generator. This is used as a double check during osr to
 422 // guard against conservative result from MethodLiveness making us
 423 // think a dead oop is live.  MethodLiveness is conservative in the
 424 // sense that it may consider locals to be live which cannot be live,
 425 // like in the case where a local could contain an oop or  a primitive
 426 // along different paths.  In that case the local must be dead when
 427 // those paths merge. Since the interpreter's viewpoint is used when
 428 // gc'ing an interpreter frame we need to use its viewpoint  during
 429 // OSR when loading the locals.
 430 
 431 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
 432   VM_ENTRY_MARK;
 433   InterpreterOopMap mask;
 434   OopMapCache::compute_one_oop_map(get_Method(), bci, &mask);
 435   int mask_size = max_locals();
 436   ResourceBitMap result(mask_size);
 437   int i;
 438   for (i = 0; i < mask_size ; i++ ) {
 439     if (mask.is_oop(i)) result.set_bit(i);
 440   }
 441   return result;
 442 }
 443 
 444 
 445 #ifdef COMPILER1
 446 // ------------------------------------------------------------------
 447 // ciMethod::bci_block_start
 448 //
 449 // Marks all bcis where a new basic block starts
 450 const BitMap& ciMethod::bci_block_start() {
 451   check_is_loaded();
 452   if (_liveness == NULL) {
 453     // Create the liveness analyzer.
 454     Arena* arena = CURRENT_ENV->arena();
 455     _liveness = new (arena) MethodLiveness(arena, this);
 456     _liveness->compute_liveness();
 457   }
 458 
 459   return _liveness->get_bci_block_start();
 460 }
 461 #endif // COMPILER1
 462 
 463 
 464 // ------------------------------------------------------------------
 465 // ciMethod::call_profile_at_bci
 466 //
 467 // Get the ciCallProfile for the invocation of this method.
 468 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
 469 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
 470   ResourceMark rm;
 471   ciCallProfile result;
 472   if (method_data() != NULL && method_data()->is_mature()) {
 473     ciProfileData* data = method_data()->bci_to_data(bci);
 474     if (data != NULL && data->is_CounterData()) {
 475       // Every profiled call site has a counter.
 476       int count = data->as_CounterData()->count();
 477 
 478       if (!data->is_ReceiverTypeData()) {
 479         result._receiver_count[0] = 0;  // that's a definite zero
 480       } else { // ReceiverTypeData is a subclass of CounterData
 481         ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
 482         // In addition, virtual call sites have receiver type information
 483         int receivers_count_total = 0;
 484         int morphism = 0;
 485         // Precompute morphism for the possible fixup
 486         for (uint i = 0; i < call->row_limit(); i++) {
 487           ciKlass* receiver = call->receiver(i);
 488           if (receiver == NULL)  continue;
 489           morphism++;
 490         }
 491         int epsilon = 0;
 492         if (TieredCompilation) {
 493           // For a call, it is assumed that either the type of the receiver(s)
 494           // is recorded or an associated counter is incremented, but not both. With
 495           // tiered compilation, however, both can happen due to the interpreter and
 496           // C1 profiling invocations differently. Address that inconsistency here.
 497           if (morphism == 1 && count > 0) {
 498             epsilon = count;
 499             count = 0;
 500           }
 501         }
 502         for (uint i = 0; i < call->row_limit(); i++) {
 503           ciKlass* receiver = call->receiver(i);
 504           if (receiver == NULL)  continue;
 505           int rcount = call->receiver_count(i) + epsilon;
 506           if (rcount == 0) rcount = 1; // Should be valid value
 507           receivers_count_total += rcount;
 508           // Add the receiver to result data.
 509           result.add_receiver(receiver, rcount);
 510           // If we extend profiling to record methods,
 511           // we will set result._method also.
 512         }
 513         // Determine call site's morphism.
 514         // The call site count is 0 with known morphism (only 1 or 2 receivers)
 515         // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
 516         // The call site count is > 0 in the case of a polymorphic virtual call.
 517         if (morphism > 0 && morphism == result._limit) {
 518            // The morphism <= MorphismLimit.
 519            if ((morphism <  ciCallProfile::MorphismLimit) ||
 520                (morphism == ciCallProfile::MorphismLimit && count == 0)) {
 521 #ifdef ASSERT
 522              if (count > 0) {
 523                this->print_short_name(tty);
 524                tty->print_cr(" @ bci:%d", bci);
 525                this->print_codes();
 526                assert(false, "this call site should not be polymorphic");
 527              }
 528 #endif
 529              result._morphism = morphism;
 530            }
 531         }
 532         // Make the count consistent if this is a call profile. If count is
 533         // zero or less, presume that this is a typecheck profile and
 534         // do nothing.  Otherwise, increase count to be the sum of all
 535         // receiver's counts.
 536         if (count >= 0) {
 537           count += receivers_count_total;
 538         }
 539       }
 540       result._count = count;
 541     }
 542   }
 543   return result;
 544 }
 545 
 546 // ------------------------------------------------------------------
 547 // Add new receiver and sort data by receiver's profile count.
 548 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
 549   // Add new receiver and sort data by receiver's counts when we have space
 550   // for it otherwise replace the less called receiver (less called receiver
 551   // is placed to the last array element which is not used).
 552   // First array's element contains most called receiver.
 553   int i = _limit;
 554   for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
 555     _receiver[i] = _receiver[i-1];
 556     _receiver_count[i] = _receiver_count[i-1];
 557   }
 558   _receiver[i] = receiver;
 559   _receiver_count[i] = receiver_count;
 560   if (_limit < MorphismLimit) _limit++;
 561 }
 562 
 563 
 564 void ciMethod::assert_virtual_call_type_ok(int bci) {
 565   assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
 566          java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 567 }
 568 
 569 void ciMethod::assert_call_type_ok(int bci) {
 570   assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
 571          java_code_at_bci(bci) == Bytecodes::_invokespecial ||
 572          java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 573 }
 574 
 575 /**
 576  * Check whether profiling provides a type for the argument i to the
 577  * call at bci bci
 578  *
 579  * @param [in]bci         bci of the call
 580  * @param [in]i           argument number
 581  * @param [out]type       profiled type of argument, NULL if none
 582  * @param [out]ptr_kind   whether always null, never null or maybe null
 583  * @return                true if profiling exists
 584  *
 585  */
 586 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 587   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 588     ciProfileData* data = method_data()->bci_to_data(bci);
 589     if (data != NULL) {
 590       if (data->is_VirtualCallTypeData()) {
 591         assert_virtual_call_type_ok(bci);
 592         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 593         if (i >= call->number_of_arguments()) {
 594           return false;
 595         }
 596         type = call->valid_argument_type(i);
 597         ptr_kind = call->argument_ptr_kind(i);
 598         return true;
 599       } else if (data->is_CallTypeData()) {
 600         assert_call_type_ok(bci);
 601         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 602         if (i >= call->number_of_arguments()) {
 603           return false;
 604         }
 605         type = call->valid_argument_type(i);
 606         ptr_kind = call->argument_ptr_kind(i);
 607         return true;
 608       }
 609     }
 610   }
 611   return false;
 612 }
 613 
 614 /**
 615  * Check whether profiling provides a type for the return value from
 616  * the call at bci bci
 617  *
 618  * @param [in]bci         bci of the call
 619  * @param [out]type       profiled type of argument, NULL if none
 620  * @param [out]ptr_kind   whether always null, never null or maybe null
 621  * @return                true if profiling exists
 622  *
 623  */
 624 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 625   if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
 626     ciProfileData* data = method_data()->bci_to_data(bci);
 627     if (data != NULL) {
 628       if (data->is_VirtualCallTypeData()) {
 629         assert_virtual_call_type_ok(bci);
 630         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 631         if (call->has_return()) {
 632           type = call->valid_return_type();
 633           ptr_kind = call->return_ptr_kind();
 634           return true;
 635         }
 636       } else if (data->is_CallTypeData()) {
 637         assert_call_type_ok(bci);
 638         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 639         if (call->has_return()) {
 640           type = call->valid_return_type();
 641           ptr_kind = call->return_ptr_kind();
 642         }
 643         return true;
 644       }
 645     }
 646   }
 647   return false;
 648 }
 649 
 650 /**
 651  * Check whether profiling provides a type for the parameter i
 652  *
 653  * @param [in]i           parameter number
 654  * @param [out]type       profiled type of parameter, NULL if none
 655  * @param [out]ptr_kind   whether always null, never null or maybe null
 656  * @return                true if profiling exists
 657  *
 658  */
 659 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 660   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 661     ciParametersTypeData* parameters = method_data()->parameters_type_data();
 662     if (parameters != NULL && i < parameters->number_of_parameters()) {
 663       type = parameters->valid_parameter_type(i);
 664       ptr_kind = parameters->parameter_ptr_kind(i);
 665       return true;
 666     }
 667   }
 668   return false;
 669 }
 670 
 671 
 672 // ------------------------------------------------------------------
 673 // ciMethod::find_monomorphic_target
 674 //
 675 // Given a certain calling environment, find the monomorphic target
 676 // for the call.  Return NULL if the call is not monomorphic in
 677 // its calling environment, or if there are only abstract methods.
 678 // The returned method is never abstract.
 679 // Note: If caller uses a non-null result, it must inform dependencies
 680 // via assert_unique_concrete_method or assert_leaf_type.
 681 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
 682                                             ciInstanceKlass* callee_holder,
 683                                             ciInstanceKlass* actual_recv,
 684                                             bool check_access) {
 685   check_is_loaded();
 686 
 687   if (actual_recv->is_interface()) {
 688     // %%% We cannot trust interface types, yet.  See bug 6312651.
 689     return NULL;
 690   }
 691 
 692   ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access);
 693   if (root_m == NULL) {
 694     // Something went wrong looking up the actual receiver method.
 695     return NULL;
 696   }
 697   assert(!root_m->is_abstract(), "resolve_invoke promise");
 698 
 699   // Make certain quick checks even if UseCHA is false.
 700 
 701   // Is it private or final?
 702   if (root_m->can_be_statically_bound()) {
 703     return root_m;
 704   }
 705 
 706   if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
 707     // Easy case.  There is no other place to put a method, so don't bother
 708     // to go through the VM_ENTRY_MARK and all the rest.
 709     return root_m;
 710   }
 711 
 712   // Array methods (clone, hashCode, etc.) are always statically bound.
 713   // If we were to see an array type here, we'd return root_m.
 714   // However, this method processes only ciInstanceKlasses.  (See 4962591.)
 715   // The inline_native_clone intrinsic narrows Object to T[] properly,
 716   // so there is no need to do the same job here.
 717 
 718   if (!UseCHA)  return NULL;
 719 
 720   VM_ENTRY_MARK;
 721 
 722   // Disable CHA for default methods for now
 723   if (root_m->is_default_method()) {
 724     return NULL;
 725   }
 726 
 727   methodHandle target;
 728   {
 729     MutexLocker locker(Compile_lock);
 730     Klass* context = actual_recv->get_Klass();
 731     target = Dependencies::find_unique_concrete_method(context,
 732                                                        root_m->get_Method());
 733     // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
 734   }
 735 
 736 #ifndef PRODUCT
 737   if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
 738     tty->print("found a non-root unique target method");
 739     tty->print_cr("  context = %s", actual_recv->get_Klass()->external_name());
 740     tty->print("  method  = ");
 741     target->print_short_name(tty);
 742     tty->cr();
 743   }
 744 #endif //PRODUCT
 745 
 746   if (target() == NULL) {
 747     return NULL;
 748   }
 749   if (target() == root_m->get_Method()) {
 750     return root_m;
 751   }
 752   if (!root_m->is_public() &&
 753       !root_m->is_protected()) {
 754     // If we are going to reason about inheritance, it's easiest
 755     // if the method in question is public, protected, or private.
 756     // If the answer is not root_m, it is conservatively correct
 757     // to return NULL, even if the CHA encountered irrelevant
 758     // methods in other packages.
 759     // %%% TO DO: Work out logic for package-private methods
 760     // with the same name but different vtable indexes.
 761     return NULL;
 762   }
 763   assert(!target()->is_abstract(), "not allowed");
 764   return CURRENT_THREAD_ENV->get_method(target());
 765 }
 766 
 767 // ------------------------------------------------------------------
 768 // ciMethod::can_be_statically_bound
 769 //
 770 // Tries to determine whether a method can be statically bound in some context.
 771 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
 772   return (holder() == context) && can_be_statically_bound();
 773 }
 774 
 775 // ------------------------------------------------------------------
 776 // ciMethod::resolve_invoke
 777 //
 778 // Given a known receiver klass, find the target for the call.
 779 // Return NULL if the call has no target or the target is abstract.
 780 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access) {
 781    check_is_loaded();
 782    VM_ENTRY_MARK;
 783 
 784    Klass* caller_klass = caller->get_Klass();
 785    Klass* recv         = exact_receiver->get_Klass();
 786    Klass* resolved     = holder()->get_Klass();
 787    Symbol* h_name      = name()->get_symbol();
 788    Symbol* h_signature = signature()->get_symbol();
 789 
 790    LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
 791                       check_access ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
 792    methodHandle m;
 793    // Only do exact lookup if receiver klass has been linked.  Otherwise,
 794    // the vtable has not been setup, and the LinkResolver will fail.
 795    if (recv->is_array_klass()
 796         ||
 797        (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
 798      if (holder()->is_interface()) {
 799        m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
 800      } else {
 801        m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
 802      }
 803    }
 804 
 805    if (m.is_null()) {
 806      // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
 807      return NULL;
 808    }
 809 
 810    ciMethod* result = this;
 811    if (m() != get_Method()) {
 812      result = CURRENT_THREAD_ENV->get_method(m());
 813    }
 814 
 815    // Don't return abstract methods because they aren't
 816    // optimizable or interesting.
 817    if (result->is_abstract()) {
 818      return NULL;
 819    } else {
 820      return result;
 821    }
 822 }
 823 
 824 // ------------------------------------------------------------------
 825 // ciMethod::resolve_vtable_index
 826 //
 827 // Given a known receiver klass, find the vtable index for the call.
 828 // Return Method::invalid_vtable_index if the vtable_index is unknown.
 829 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
 830    check_is_loaded();
 831 
 832    int vtable_index = Method::invalid_vtable_index;
 833    // Only do lookup if receiver klass has been linked.  Otherwise,
 834    // the vtable has not been setup, and the LinkResolver will fail.
 835    if (!receiver->is_interface()
 836        && (!receiver->is_instance_klass() ||
 837            receiver->as_instance_klass()->is_linked())) {
 838      VM_ENTRY_MARK;
 839 
 840      Klass* caller_klass = caller->get_Klass();
 841      Klass* recv         = receiver->get_Klass();
 842      Symbol* h_name = name()->get_symbol();
 843      Symbol* h_signature = signature()->get_symbol();
 844 
 845      LinkInfo link_info(recv, h_name, h_signature, caller_klass);
 846      vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
 847      if (vtable_index == Method::nonvirtual_vtable_index) {
 848        // A statically bound method.  Return "no such index".
 849        vtable_index = Method::invalid_vtable_index;
 850      }
 851    }
 852 
 853    return vtable_index;
 854 }
 855 
 856 // ------------------------------------------------------------------
 857 // ciMethod::interpreter_call_site_count
 858 int ciMethod::interpreter_call_site_count(int bci) {
 859   if (method_data() != NULL) {
 860     ResourceMark rm;
 861     ciProfileData* data = method_data()->bci_to_data(bci);
 862     if (data != NULL && data->is_CounterData()) {
 863       return scale_count(data->as_CounterData()->count());
 864     }
 865   }
 866   return -1;  // unknown
 867 }
 868 
 869 // ------------------------------------------------------------------
 870 // ciMethod::get_field_at_bci
 871 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
 872   ciBytecodeStream iter(this);
 873   iter.reset_to_bci(bci);
 874   iter.next();
 875   return iter.get_field(will_link);
 876 }
 877 
 878 // ------------------------------------------------------------------
 879 // ciMethod::get_method_at_bci
 880 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
 881   ciBytecodeStream iter(this);
 882   iter.reset_to_bci(bci);
 883   iter.next();
 884   return iter.get_method(will_link, declared_signature);
 885 }
 886 
 887 // ------------------------------------------------------------------
 888 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
 889   ciBytecodeStream iter(this);
 890   iter.reset_to_bci(bci);
 891   iter.next();
 892   return iter.get_declared_method_holder();
 893 }
 894 
 895 // ------------------------------------------------------------------
 896 // Adjust a CounterData count to be commensurate with
 897 // interpreter_invocation_count.  If the MDO exists for
 898 // only 25% of the time the method exists, then the
 899 // counts in the MDO should be scaled by 4X, so that
 900 // they can be usefully and stably compared against the
 901 // invocation counts in methods.
 902 int ciMethod::scale_count(int count, float prof_factor) {
 903   if (count > 0 && method_data() != NULL) {
 904     int counter_life;
 905     int method_life = interpreter_invocation_count();
 906     if (TieredCompilation) {
 907       // In tiered the MDO's life is measured directly, so just use the snapshotted counters
 908       counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
 909     } else {
 910       int current_mileage = method_data()->current_mileage();
 911       int creation_mileage = method_data()->creation_mileage();
 912       counter_life = current_mileage - creation_mileage;
 913     }
 914 
 915     // counter_life due to backedge_counter could be > method_life
 916     if (counter_life > method_life)
 917       counter_life = method_life;
 918     if (0 < counter_life && counter_life <= method_life) {
 919       count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
 920       count = (count > 0) ? count : 1;
 921     }
 922   }
 923   return count;
 924 }
 925 
 926 
 927 // ------------------------------------------------------------------
 928 // ciMethod::is_special_get_caller_class_method
 929 //
 930 bool ciMethod::is_ignored_by_security_stack_walk() const {
 931   check_is_loaded();
 932   VM_ENTRY_MARK;
 933   return get_Method()->is_ignored_by_security_stack_walk();
 934 }
 935 
 936 
 937 // ------------------------------------------------------------------
 938 // invokedynamic support
 939 
 940 // ------------------------------------------------------------------
 941 // ciMethod::is_method_handle_intrinsic
 942 //
 943 // Return true if the method is an instance of the JVM-generated
 944 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
 945 bool ciMethod::is_method_handle_intrinsic() const {
 946   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 947   return (MethodHandles::is_signature_polymorphic(iid) &&
 948           MethodHandles::is_signature_polymorphic_intrinsic(iid));
 949 }
 950 
 951 // ------------------------------------------------------------------
 952 // ciMethod::is_compiled_lambda_form
 953 //
 954 // Return true if the method is a generated MethodHandle adapter.
 955 // These are built by Java code.
 956 bool ciMethod::is_compiled_lambda_form() const {
 957   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 958   return iid == vmIntrinsics::_compiledLambdaForm;
 959 }
 960 
 961 // ------------------------------------------------------------------
 962 // ciMethod::is_object_initializer
 963 //
 964 bool ciMethod::is_object_initializer() const {
 965    return name() == ciSymbol::object_initializer_name();
 966 }
 967 
 968 // ------------------------------------------------------------------
 969 // ciMethod::has_member_arg
 970 //
 971 // Return true if the method is a linker intrinsic like _linkToVirtual.
 972 // These are built by the JVM.
 973 bool ciMethod::has_member_arg() const {
 974   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 975   return (MethodHandles::is_signature_polymorphic(iid) &&
 976           MethodHandles::has_member_arg(iid));
 977 }
 978 
 979 // ------------------------------------------------------------------
 980 // ciMethod::ensure_method_data
 981 //
 982 // Generate new MethodData* objects at compile time.
 983 // Return true if allocation was successful or no MDO is required.
 984 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
 985   EXCEPTION_CONTEXT;
 986   if (is_native() || is_abstract() || h_m()->is_accessor()) {
 987     return true;
 988   }
 989   if (h_m()->method_data() == NULL) {
 990     Method::build_interpreter_method_data(h_m, THREAD);
 991     if (HAS_PENDING_EXCEPTION) {
 992       CLEAR_PENDING_EXCEPTION;
 993     }
 994   }
 995   if (h_m()->method_data() != NULL) {
 996     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
 997     _method_data->load_data();
 998     return true;
 999   } else {
1000     _method_data = CURRENT_ENV->get_empty_methodData();
1001     return false;
1002   }
1003 }
1004 
1005 // public, retroactive version
1006 bool ciMethod::ensure_method_data() {
1007   bool result = true;
1008   if (_method_data == NULL || _method_data->is_empty()) {
1009     GUARDED_VM_ENTRY({
1010       result = ensure_method_data(get_Method());
1011     });
1012   }
1013   return result;
1014 }
1015 
1016 
1017 // ------------------------------------------------------------------
1018 // ciMethod::method_data
1019 //
1020 ciMethodData* ciMethod::method_data() {
1021   if (_method_data != NULL) {
1022     return _method_data;
1023   }
1024   VM_ENTRY_MARK;
1025   ciEnv* env = CURRENT_ENV;
1026   Thread* my_thread = JavaThread::current();
1027   methodHandle h_m(my_thread, get_Method());
1028 
1029   if (h_m()->method_data() != NULL) {
1030     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1031     _method_data->load_data();
1032   } else {
1033     _method_data = CURRENT_ENV->get_empty_methodData();
1034   }
1035   return _method_data;
1036 
1037 }
1038 
1039 // ------------------------------------------------------------------
1040 // ciMethod::method_data_or_null
1041 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1042 // NULL otherwise.
1043 ciMethodData* ciMethod::method_data_or_null() {
1044   ciMethodData *md = method_data();
1045   if (md->is_empty()) {
1046     return NULL;
1047   }
1048   return md;
1049 }
1050 
1051 // ------------------------------------------------------------------
1052 // ciMethod::ensure_method_counters
1053 //
1054 MethodCounters* ciMethod::ensure_method_counters() {
1055   check_is_loaded();
1056   VM_ENTRY_MARK;
1057   methodHandle mh(THREAD, get_Method());
1058   MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1059   return method_counters;
1060 }
1061 
1062 // ------------------------------------------------------------------
1063 // ciMethod::has_option
1064 //
1065 bool ciMethod::has_option(const char* option) {
1066   check_is_loaded();
1067   VM_ENTRY_MARK;
1068   methodHandle mh(THREAD, get_Method());
1069   return CompilerOracle::has_option_string(mh, option);
1070 }
1071 
1072 // ------------------------------------------------------------------
1073 // ciMethod::has_option_value
1074 //
1075 bool ciMethod::has_option_value(const char* option, double& value) {
1076   check_is_loaded();
1077   VM_ENTRY_MARK;
1078   methodHandle mh(THREAD, get_Method());
1079   return CompilerOracle::has_option_value(mh, option, value);
1080 }
1081 // ------------------------------------------------------------------
1082 // ciMethod::can_be_compiled
1083 //
1084 // Have previous compilations of this method succeeded?
1085 bool ciMethod::can_be_compiled() {
1086   check_is_loaded();
1087   ciEnv* env = CURRENT_ENV;
1088   if (is_c1_compile(env->comp_level())) {
1089     return _is_c1_compilable;
1090   }
1091   return _is_c2_compilable;
1092 }
1093 
1094 // ------------------------------------------------------------------
1095 // ciMethod::set_not_compilable
1096 //
1097 // Tell the VM that this method cannot be compiled at all.
1098 void ciMethod::set_not_compilable(const char* reason) {
1099   check_is_loaded();
1100   VM_ENTRY_MARK;
1101   ciEnv* env = CURRENT_ENV;
1102   if (is_c1_compile(env->comp_level())) {
1103     _is_c1_compilable = false;
1104   } else {
1105     _is_c2_compilable = false;
1106   }
1107   get_Method()->set_not_compilable(env->comp_level(), true, reason);
1108 }
1109 
1110 // ------------------------------------------------------------------
1111 // ciMethod::can_be_osr_compiled
1112 //
1113 // Have previous compilations of this method succeeded?
1114 //
1115 // Implementation note: the VM does not currently keep track
1116 // of failed OSR compilations per bci.  The entry_bci parameter
1117 // is currently unused.
1118 bool ciMethod::can_be_osr_compiled(int entry_bci) {
1119   check_is_loaded();
1120   VM_ENTRY_MARK;
1121   ciEnv* env = CURRENT_ENV;
1122   return !get_Method()->is_not_osr_compilable(env->comp_level());
1123 }
1124 
1125 // ------------------------------------------------------------------
1126 // ciMethod::has_compiled_code
1127 bool ciMethod::has_compiled_code() {
1128   return instructions_size() > 0;
1129 }
1130 
1131 int ciMethod::comp_level() {
1132   check_is_loaded();
1133   VM_ENTRY_MARK;
1134   CompiledMethod* nm = get_Method()->code();
1135   if (nm != NULL) return nm->comp_level();
1136   return 0;
1137 }
1138 
1139 int ciMethod::highest_osr_comp_level() {
1140   check_is_loaded();
1141   VM_ENTRY_MARK;
1142   return get_Method()->highest_osr_comp_level();
1143 }
1144 
1145 // ------------------------------------------------------------------
1146 // ciMethod::code_size_for_inlining
1147 //
1148 // Code size for inlining decisions.  This method returns a code
1149 // size of 1 for methods which has the ForceInline annotation.
1150 int ciMethod::code_size_for_inlining() {
1151   check_is_loaded();
1152   if (get_Method()->force_inline()) {
1153     return 1;
1154   }
1155   return code_size();
1156 }
1157 
1158 // ------------------------------------------------------------------
1159 // ciMethod::instructions_size
1160 //
1161 // This is a rough metric for "fat" methods, compared before inlining
1162 // with InlineSmallCode.  The CodeBlob::code_size accessor includes
1163 // junk like exception handler, stubs, and constant table, which are
1164 // not highly relevant to an inlined method.  So we use the more
1165 // specific accessor nmethod::insts_size.
1166 int ciMethod::instructions_size() {
1167   if (_instructions_size == -1) {
1168     GUARDED_VM_ENTRY(
1169                      CompiledMethod* code = get_Method()->code();
1170                      if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1171                        _instructions_size = code->insts_end() - code->verified_entry_point();
1172                      } else {
1173                        _instructions_size = 0;
1174                      }
1175                      );
1176   }
1177   return _instructions_size;
1178 }
1179 
1180 // ------------------------------------------------------------------
1181 // ciMethod::log_nmethod_identity
1182 void ciMethod::log_nmethod_identity(xmlStream* log) {
1183   GUARDED_VM_ENTRY(
1184     CompiledMethod* code = get_Method()->code();
1185     if (code != NULL) {
1186       code->log_identity(log);
1187     }
1188   )
1189 }
1190 
1191 // ------------------------------------------------------------------
1192 // ciMethod::is_not_reached
1193 bool ciMethod::is_not_reached(int bci) {
1194   check_is_loaded();
1195   VM_ENTRY_MARK;
1196   return Interpreter::is_not_reached(
1197                methodHandle(THREAD, get_Method()), bci);
1198 }
1199 
1200 // ------------------------------------------------------------------
1201 // ciMethod::was_never_executed
1202 bool ciMethod::was_executed_more_than(int times) {
1203   VM_ENTRY_MARK;
1204   return get_Method()->was_executed_more_than(times);
1205 }
1206 
1207 // ------------------------------------------------------------------
1208 // ciMethod::has_unloaded_classes_in_signature
1209 bool ciMethod::has_unloaded_classes_in_signature() {
1210   VM_ENTRY_MARK;
1211   {
1212     EXCEPTION_MARK;
1213     methodHandle m(THREAD, get_Method());
1214     bool has_unloaded = Method::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
1215     if( HAS_PENDING_EXCEPTION ) {
1216       CLEAR_PENDING_EXCEPTION;
1217       return true;     // Declare that we may have unloaded classes
1218     }
1219     return has_unloaded;
1220   }
1221 }
1222 
1223 // ------------------------------------------------------------------
1224 // ciMethod::is_klass_loaded
1225 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1226   VM_ENTRY_MARK;
1227   return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1228 }
1229 
1230 // ------------------------------------------------------------------
1231 // ciMethod::check_call
1232 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1233   // This method is used only in C2 from InlineTree::ok_to_inline,
1234   // and is only used under -Xcomp.
1235   // It appears to fail when applied to an invokeinterface call site.
1236   // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1237   VM_ENTRY_MARK;
1238   {
1239     EXCEPTION_MARK;
1240     HandleMark hm(THREAD);
1241     constantPoolHandle pool (THREAD, get_Method()->constants());
1242     Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1243     methodHandle spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1244     if (HAS_PENDING_EXCEPTION) {
1245       CLEAR_PENDING_EXCEPTION;
1246       return false;
1247     } else {
1248       return (spec_method->is_static() == is_static);
1249     }
1250   }
1251   return false;
1252 }
1253 
1254 // ------------------------------------------------------------------
1255 // ciMethod::profile_aging
1256 //
1257 // Should the method be compiled with an age counter?
1258 bool ciMethod::profile_aging() const {
1259   return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1260                           !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1261 }
1262 // ------------------------------------------------------------------
1263 // ciMethod::print_codes
1264 //
1265 // Print the bytecodes for this method.
1266 void ciMethod::print_codes_on(outputStream* st) {
1267   check_is_loaded();
1268   GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1269 }
1270 
1271 
1272 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1273   check_is_loaded(); \
1274   VM_ENTRY_MARK; \
1275   return get_Method()->flag_accessor(); \
1276 }
1277 
1278 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }
1279 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1280 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }
1281 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }
1282 bool ciMethod::is_getter      () const {         FETCH_FLAG_FROM_VM(is_getter); }
1283 bool ciMethod::is_setter      () const {         FETCH_FLAG_FROM_VM(is_setter); }
1284 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }
1285 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }
1286 
1287 bool ciMethod::is_boxing_method() const {
1288   if (holder()->is_box_klass()) {
1289     switch (intrinsic_id()) {
1290       case vmIntrinsics::_Boolean_valueOf:
1291       case vmIntrinsics::_Byte_valueOf:
1292       case vmIntrinsics::_Character_valueOf:
1293       case vmIntrinsics::_Short_valueOf:
1294       case vmIntrinsics::_Integer_valueOf:
1295       case vmIntrinsics::_Long_valueOf:
1296       case vmIntrinsics::_Float_valueOf:
1297       case vmIntrinsics::_Double_valueOf:
1298         return true;
1299       default:
1300         return false;
1301     }
1302   }
1303   return false;
1304 }
1305 
1306 bool ciMethod::is_unboxing_method() const {
1307   if (holder()->is_box_klass()) {
1308     switch (intrinsic_id()) {
1309       case vmIntrinsics::_booleanValue:
1310       case vmIntrinsics::_byteValue:
1311       case vmIntrinsics::_charValue:
1312       case vmIntrinsics::_shortValue:
1313       case vmIntrinsics::_intValue:
1314       case vmIntrinsics::_longValue:
1315       case vmIntrinsics::_floatValue:
1316       case vmIntrinsics::_doubleValue:
1317         return true;
1318       default:
1319         return false;
1320     }
1321   }
1322   return false;
1323 }
1324 
1325 BCEscapeAnalyzer  *ciMethod::get_bcea() {
1326 #ifdef COMPILER2
1327   if (_bcea == NULL) {
1328     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1329   }
1330   return _bcea;
1331 #else // COMPILER2
1332   ShouldNotReachHere();
1333   return NULL;
1334 #endif // COMPILER2
1335 }
1336 
1337 ciMethodBlocks  *ciMethod::get_method_blocks() {
1338   Arena *arena = CURRENT_ENV->arena();
1339   if (_method_blocks == NULL) {
1340     _method_blocks = new (arena) ciMethodBlocks(arena, this);
1341   }
1342   return _method_blocks;
1343 }
1344 
1345 #undef FETCH_FLAG_FROM_VM
1346 
1347 void ciMethod::dump_name_as_ascii(outputStream* st) {
1348   Method* method = get_Method();
1349   st->print("%s %s %s",
1350             method->klass_name()->as_quoted_ascii(),
1351             method->name()->as_quoted_ascii(),
1352             method->signature()->as_quoted_ascii());
1353 }
1354 
1355 void ciMethod::dump_replay_data(outputStream* st) {
1356   ResourceMark rm;
1357   Method* method = get_Method();
1358   MethodCounters* mcs = method->method_counters();
1359   st->print("ciMethod ");
1360   dump_name_as_ascii(st);
1361   st->print_cr(" %d %d %d %d %d",
1362                mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1363                mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1364                interpreter_invocation_count(),
1365                interpreter_throwout_count(),
1366                _instructions_size);
1367 }
1368 
1369 // ------------------------------------------------------------------
1370 // ciMethod::print_codes
1371 //
1372 // Print a range of the bytecodes for this method.
1373 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1374   check_is_loaded();
1375   GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1376 }
1377 
1378 // ------------------------------------------------------------------
1379 // ciMethod::print_name
1380 //
1381 // Print the name of this method, including signature and some flags.
1382 void ciMethod::print_name(outputStream* st) {
1383   check_is_loaded();
1384   GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1385 }
1386 
1387 // ------------------------------------------------------------------
1388 // ciMethod::print_short_name
1389 //
1390 // Print the name of this method, without signature.
1391 void ciMethod::print_short_name(outputStream* st) {
1392   if (is_loaded()) {
1393     GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1394   } else {
1395     // Fall back if method is not loaded.
1396     holder()->print_name_on(st);
1397     st->print("::");
1398     name()->print_symbol_on(st);
1399     if (WizardMode)
1400       signature()->as_symbol()->print_symbol_on(st);
1401   }
1402 }
1403 
1404 // ------------------------------------------------------------------
1405 // ciMethod::print_impl
1406 //
1407 // Implementation of the print method.
1408 void ciMethod::print_impl(outputStream* st) {
1409   ciMetadata::print_impl(st);
1410   st->print(" name=");
1411   name()->print_symbol_on(st);
1412   st->print(" holder=");
1413   holder()->print_name_on(st);
1414   st->print(" signature=");
1415   signature()->as_symbol()->print_symbol_on(st);
1416   if (is_loaded()) {
1417     st->print(" loaded=true");
1418     st->print(" arg_size=%d", arg_size());
1419     st->print(" flags=");
1420     flags().print_member_flags(st);
1421   } else {
1422     st->print(" loaded=false");
1423   }
1424 }
1425 
1426 // ------------------------------------------------------------------
1427 
1428 static BasicType erase_to_word_type(BasicType bt) {
1429   if (is_subword_type(bt)) return T_INT;
1430   if (bt == T_ARRAY)       return T_OBJECT;
1431   return bt;
1432 }
1433 
1434 static bool basic_types_match(ciType* t1, ciType* t2) {
1435   if (t1 == t2)  return true;
1436   return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1437 }
1438 
1439 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1440   bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1441                                   !resolved_method->is_method_handle_intrinsic();
1442 
1443   if (!invoke_through_mh_intrinsic) {
1444     // Method name & descriptor should stay the same.
1445     // Signatures may reference unloaded types and thus they may be not strictly equal.
1446     ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1447     ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1448 
1449     return (declared_method->name()->equals(resolved_method->name())) &&
1450            (declared_signature->equals(resolved_signature));
1451   }
1452 
1453   ciMethod* linker = declared_method;
1454   ciMethod* target = resolved_method;
1455   // Linkers have appendix argument which is not passed to callee.
1456   int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1457   if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1458     return false; // argument slot count mismatch
1459   }
1460 
1461   ciSignature* linker_sig = linker->signature();
1462   ciSignature* target_sig = target->signature();
1463 
1464   if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1465       target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1466     return false; // argument count mismatch
1467   }
1468 
1469   int sbase = 0, rbase = 0;
1470   switch (linker->intrinsic_id()) {
1471     case vmIntrinsics::_linkToVirtual:
1472     case vmIntrinsics::_linkToInterface:
1473     case vmIntrinsics::_linkToSpecial: {
1474       if (target->is_static()) {
1475         return false;
1476       }
1477       if (linker_sig->type_at(0)->is_primitive_type()) {
1478         return false;  // receiver should be an oop
1479       }
1480       sbase = 1; // skip receiver
1481       break;
1482     }
1483     case vmIntrinsics::_linkToStatic: {
1484       if (!target->is_static()) {
1485         return false;
1486       }
1487       break;
1488     }
1489     case vmIntrinsics::_invokeBasic: {
1490       if (target->is_static()) {
1491         if (target_sig->type_at(0)->is_primitive_type()) {
1492           return false; // receiver should be an oop
1493         }
1494         rbase = 1; // skip receiver
1495       }
1496       break;
1497     }
1498     default:
1499       break;
1500   }
1501   assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1502   int arg_count = target_sig->count() - rbase;
1503   for (int i = 0; i < arg_count; i++) {
1504     if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1505       return false;
1506     }
1507   }
1508   // Only check the return type if the symbolic info has non-void return type.
1509   // I.e. the return value of the resolved method can be dropped.
1510   if (!linker->return_type()->is_void() &&
1511       !basic_types_match(linker->return_type(), target->return_type())) {
1512     return false;
1513   }
1514   return true; // no mismatch found
1515 }
1516 
1517 // ------------------------------------------------------------------