1 /*
   2  * Copyright (c) 1999, 2017, 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.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/oop.inline.hpp"
  46 #include "prims/nativeLookup.hpp"
  47 #include "runtime/deoptimization.hpp"
  48 #include "utilities/bitMap.inline.hpp"
  49 #include "utilities/xmlstream.hpp"
  50 #include "trace/tracing.hpp"
  51 #ifdef COMPILER2
  52 #include "ci/bcEscapeAnalyzer.hpp"
  53 #include "ci/ciTypeFlow.hpp"
  54 #include "oops/method.hpp"
  55 #endif
  56 #ifdef SHARK
  57 #include "ci/ciTypeFlow.hpp"
  58 #include "oops/method.hpp"
  59 #endif
  60 
  61 // ciMethod
  62 //
  63 // This class represents a Method* in the HotSpot virtual
  64 // machine.
  65 
  66 
  67 // ------------------------------------------------------------------
  68 // ciMethod::ciMethod
  69 //
  70 // Loaded method.
  71 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
  72   ciMetadata(h_m()),
  73   _holder(holder)
  74 {
  75   assert(h_m() != NULL, "no null method");
  76 
  77   if (LogTouchedMethods) {
  78     h_m()->log_touched(Thread::current());
  79   }
  80   // These fields are always filled in in loaded methods.
  81   _flags = ciFlags(h_m()->access_flags());
  82 
  83   // Easy to compute, so fill them in now.
  84   _max_stack          = h_m()->max_stack();
  85   _max_locals         = h_m()->max_locals();
  86   _code_size          = h_m()->code_size();
  87   _intrinsic_id       = h_m()->intrinsic_id();
  88   _handler_count      = h_m()->exception_table_length();
  89   _size_of_parameters = h_m()->size_of_parameters();
  90   _uses_monitors      = h_m()->access_flags().has_monitor_bytecodes();
  91   _balanced_monitors  = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
  92   _is_c1_compilable   = !h_m()->is_not_c1_compilable();
  93   _is_c2_compilable   = !h_m()->is_not_c2_compilable();
  94   _has_reserved_stack_access = h_m()->has_reserved_stack_access();
  95   // Lazy fields, filled in on demand.  Require allocation.
  96   _code               = NULL;
  97   _exception_handlers = NULL;
  98   _liveness           = NULL;
  99   _method_blocks = NULL;
 100 #if defined(COMPILER2) || defined(SHARK)
 101   _flow               = NULL;
 102   _bcea               = NULL;
 103 #endif // COMPILER2 || SHARK
 104 
 105   ciEnv *env = CURRENT_ENV;
 106   if (env->jvmti_can_hotswap_or_post_breakpoint() && can_be_compiled()) {
 107     // 6328518 check hotswap conditions under the right lock.
 108     MutexLocker locker(Compile_lock);
 109     if (Dependencies::check_evol_method(h_m()) != NULL) {
 110       _is_c1_compilable = false;
 111       _is_c2_compilable = 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   _intrinsic_id(           vmIntrinsics::_none),
 172   _liveness(               NULL),
 173   _can_be_statically_bound(false),
 174   _method_blocks(          NULL),
 175   _method_data(            NULL)
 176 #if defined(COMPILER2) || defined(SHARK)
 177   ,
 178   _flow(                   NULL),
 179   _bcea(                   NULL),
 180   _instructions_size(-1)
 181 #endif // COMPILER2 || SHARK
 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 #ifdef SHARK
 291 // ------------------------------------------------------------------
 292 // ciMethod::itable_index
 293 //
 294 // Get the position of this method's entry in the itable, if any.
 295 int ciMethod::itable_index() {
 296   check_is_loaded();
 297   assert(holder()->is_linked(), "must be linked");
 298   VM_ENTRY_MARK;
 299   Method* m = get_Method();
 300   if (!m->has_itable_index())
 301     return Method::nonvirtual_vtable_index;
 302   return m->itable_index();
 303 }
 304 #endif // SHARK
 305 
 306 
 307 // ------------------------------------------------------------------
 308 // ciMethod::native_entry
 309 //
 310 // Get the address of this method's native code, if any.
 311 address ciMethod::native_entry() {
 312   check_is_loaded();
 313   assert(flags().is_native(), "must be native method");
 314   VM_ENTRY_MARK;
 315   Method* method = get_Method();
 316   address entry = method->native_function();
 317   assert(entry != NULL, "must be valid entry point");
 318   return entry;
 319 }
 320 
 321 
 322 // ------------------------------------------------------------------
 323 // ciMethod::interpreter_entry
 324 //
 325 // Get the entry point for running this method in the interpreter.
 326 address ciMethod::interpreter_entry() {
 327   check_is_loaded();
 328   VM_ENTRY_MARK;
 329   methodHandle mh(THREAD, get_Method());
 330   return Interpreter::entry_for_method(mh);
 331 }
 332 
 333 
 334 // ------------------------------------------------------------------
 335 // ciMethod::uses_balanced_monitors
 336 //
 337 // Does this method use monitors in a strict stack-disciplined manner?
 338 bool ciMethod::has_balanced_monitors() {
 339   check_is_loaded();
 340   if (_balanced_monitors) return true;
 341 
 342   // Analyze the method to see if monitors are used properly.
 343   VM_ENTRY_MARK;
 344   methodHandle method(THREAD, get_Method());
 345   assert(method->has_monitor_bytecodes(), "should have checked this");
 346 
 347   // Check to see if a previous compilation computed the
 348   // monitor-matching analysis.
 349   if (method->guaranteed_monitor_matching()) {
 350     _balanced_monitors = true;
 351     return true;
 352   }
 353 
 354   {
 355     EXCEPTION_MARK;
 356     ResourceMark rm(THREAD);
 357     GeneratePairingInfo gpi(method);
 358     gpi.compute_map(CATCH);
 359     if (!gpi.monitor_safe()) {
 360       return false;
 361     }
 362     method->set_guaranteed_monitor_matching();
 363     _balanced_monitors = true;
 364   }
 365   return true;
 366 }
 367 
 368 
 369 // ------------------------------------------------------------------
 370 // ciMethod::get_flow_analysis
 371 ciTypeFlow* ciMethod::get_flow_analysis() {
 372 #if defined(COMPILER2) || defined(SHARK)
 373   if (_flow == NULL) {
 374     ciEnv* env = CURRENT_ENV;
 375     _flow = new (env->arena()) ciTypeFlow(env, this);
 376     _flow->do_flow();
 377   }
 378   return _flow;
 379 #else // COMPILER2 || SHARK
 380   ShouldNotReachHere();
 381   return NULL;
 382 #endif // COMPILER2 || SHARK
 383 }
 384 
 385 
 386 // ------------------------------------------------------------------
 387 // ciMethod::get_osr_flow_analysis
 388 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
 389 #if defined(COMPILER2) || defined(SHARK)
 390   // OSR entry points are always place after a call bytecode of some sort
 391   assert(osr_bci >= 0, "must supply valid OSR entry point");
 392   ciEnv* env = CURRENT_ENV;
 393   ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
 394   flow->do_flow();
 395   return flow;
 396 #else // COMPILER2 || SHARK
 397   ShouldNotReachHere();
 398   return NULL;
 399 #endif // COMPILER2 || SHARK
 400 }
 401 
 402 // ------------------------------------------------------------------
 403 // ciMethod::raw_liveness_at_bci
 404 //
 405 // Which local variables are live at a specific bci?
 406 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
 407   check_is_loaded();
 408   if (_liveness == NULL) {
 409     // Create the liveness analyzer.
 410     Arena* arena = CURRENT_ENV->arena();
 411     _liveness = new (arena) MethodLiveness(arena, this);
 412     _liveness->compute_liveness();
 413   }
 414   return _liveness->get_liveness_at(bci);
 415 }
 416 
 417 // ------------------------------------------------------------------
 418 // ciMethod::liveness_at_bci
 419 //
 420 // Which local variables are live at a specific bci?  When debugging
 421 // will return true for all locals in some cases to improve debug
 422 // information.
 423 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
 424   MethodLivenessResult result = raw_liveness_at_bci(bci);
 425   if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot || CompileTheWorld) {
 426     // Keep all locals live for the user's edification and amusement.
 427     result.at_put_range(0, result.size(), true);
 428   }
 429   return result;
 430 }
 431 
 432 // ciMethod::live_local_oops_at_bci
 433 //
 434 // find all the live oops in the locals array for a particular bci
 435 // Compute what the interpreter believes by using the interpreter
 436 // oopmap generator. This is used as a double check during osr to
 437 // guard against conservative result from MethodLiveness making us
 438 // think a dead oop is live.  MethodLiveness is conservative in the
 439 // sense that it may consider locals to be live which cannot be live,
 440 // like in the case where a local could contain an oop or  a primitive
 441 // along different paths.  In that case the local must be dead when
 442 // those paths merge. Since the interpreter's viewpoint is used when
 443 // gc'ing an interpreter frame we need to use its viewpoint  during
 444 // OSR when loading the locals.
 445 
 446 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
 447   VM_ENTRY_MARK;
 448   InterpreterOopMap mask;
 449   OopMapCache::compute_one_oop_map(get_Method(), bci, &mask);
 450   int mask_size = max_locals();
 451   ResourceBitMap result(mask_size);
 452   int i;
 453   for (i = 0; i < mask_size ; i++ ) {
 454     if (mask.is_oop(i)) result.set_bit(i);
 455   }
 456   return result;
 457 }
 458 
 459 
 460 #ifdef COMPILER1
 461 // ------------------------------------------------------------------
 462 // ciMethod::bci_block_start
 463 //
 464 // Marks all bcis where a new basic block starts
 465 const BitMap& ciMethod::bci_block_start() {
 466   check_is_loaded();
 467   if (_liveness == NULL) {
 468     // Create the liveness analyzer.
 469     Arena* arena = CURRENT_ENV->arena();
 470     _liveness = new (arena) MethodLiveness(arena, this);
 471     _liveness->compute_liveness();
 472   }
 473 
 474   return _liveness->get_bci_block_start();
 475 }
 476 #endif // COMPILER1
 477 
 478 
 479 // ------------------------------------------------------------------
 480 // ciMethod::call_profile_at_bci
 481 //
 482 // Get the ciCallProfile for the invocation of this method.
 483 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
 484 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
 485   ResourceMark rm;
 486   ciCallProfile result;
 487   if (method_data() != NULL && method_data()->is_mature()) {
 488     ciProfileData* data = method_data()->bci_to_data(bci);
 489     if (data != NULL && data->is_CounterData()) {
 490       // Every profiled call site has a counter.
 491       int count = data->as_CounterData()->count();
 492 
 493       if (!data->is_ReceiverTypeData()) {
 494         result._receiver_count[0] = 0;  // that's a definite zero
 495       } else { // ReceiverTypeData is a subclass of CounterData
 496         ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
 497         // In addition, virtual call sites have receiver type information
 498         int receivers_count_total = 0;
 499         int morphism = 0;
 500         // Precompute morphism for the possible fixup
 501         for (uint i = 0; i < call->row_limit(); i++) {
 502           ciKlass* receiver = call->receiver(i);
 503           if (receiver == NULL)  continue;
 504           morphism++;
 505         }
 506         int epsilon = 0;
 507         if (TieredCompilation) {
 508           // For a call, it is assumed that either the type of the receiver(s)
 509           // is recorded or an associated counter is incremented, but not both. With
 510           // tiered compilation, however, both can happen due to the interpreter and
 511           // C1 profiling invocations differently. Address that inconsistency here.
 512           if (morphism == 1 && count > 0) {
 513             epsilon = count;
 514             count = 0;
 515           }
 516         }
 517         for (uint i = 0; i < call->row_limit(); i++) {
 518           ciKlass* receiver = call->receiver(i);
 519           if (receiver == NULL)  continue;
 520           int rcount = call->receiver_count(i) + epsilon;
 521           if (rcount == 0) rcount = 1; // Should be valid value
 522           receivers_count_total += rcount;
 523           // Add the receiver to result data.
 524           result.add_receiver(receiver, rcount);
 525           // If we extend profiling to record methods,
 526           // we will set result._method also.
 527         }
 528         // Determine call site's morphism.
 529         // The call site count is 0 with known morphism (only 1 or 2 receivers)
 530         // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
 531         // The call site count is > 0 in the case of a polymorphic virtual call.
 532         if (morphism > 0 && morphism == result._limit) {
 533            // The morphism <= MorphismLimit.
 534            if ((morphism <  ciCallProfile::MorphismLimit) ||
 535                (morphism == ciCallProfile::MorphismLimit && count == 0)) {
 536 #ifdef ASSERT
 537              if (count > 0) {
 538                this->print_short_name(tty);
 539                tty->print_cr(" @ bci:%d", bci);
 540                this->print_codes();
 541                assert(false, "this call site should not be polymorphic");
 542              }
 543 #endif
 544              result._morphism = morphism;
 545            }
 546         }
 547         // Make the count consistent if this is a call profile. If count is
 548         // zero or less, presume that this is a typecheck profile and
 549         // do nothing.  Otherwise, increase count to be the sum of all
 550         // receiver's counts.
 551         if (count >= 0) {
 552           count += receivers_count_total;
 553         }
 554       }
 555       result._count = count;
 556     }
 557   }
 558   return result;
 559 }
 560 
 561 // ------------------------------------------------------------------
 562 // Add new receiver and sort data by receiver's profile count.
 563 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
 564   // Add new receiver and sort data by receiver's counts when we have space
 565   // for it otherwise replace the less called receiver (less called receiver
 566   // is placed to the last array element which is not used).
 567   // First array's element contains most called receiver.
 568   int i = _limit;
 569   for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
 570     _receiver[i] = _receiver[i-1];
 571     _receiver_count[i] = _receiver_count[i-1];
 572   }
 573   _receiver[i] = receiver;
 574   _receiver_count[i] = receiver_count;
 575   if (_limit < MorphismLimit) _limit++;
 576 }
 577 
 578 
 579 void ciMethod::assert_virtual_call_type_ok(int bci) {
 580   assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
 581          java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 582 }
 583 
 584 void ciMethod::assert_call_type_ok(int bci) {
 585   assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
 586          java_code_at_bci(bci) == Bytecodes::_invokespecial ||
 587          java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 588 }
 589 
 590 /**
 591  * Check whether profiling provides a type for the argument i to the
 592  * call at bci bci
 593  *
 594  * @param [in]bci         bci of the call
 595  * @param [in]i           argument number
 596  * @param [out]type       profiled type of argument, NULL if none
 597  * @param [out]ptr_kind   whether always null, never null or maybe null
 598  * @return                true if profiling exists
 599  *
 600  */
 601 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 602   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 603     ciProfileData* data = method_data()->bci_to_data(bci);
 604     if (data != NULL) {
 605       if (data->is_VirtualCallTypeData()) {
 606         assert_virtual_call_type_ok(bci);
 607         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 608         if (i >= call->number_of_arguments()) {
 609           return false;
 610         }
 611         type = call->valid_argument_type(i);
 612         ptr_kind = call->argument_ptr_kind(i);
 613         return true;
 614       } else if (data->is_CallTypeData()) {
 615         assert_call_type_ok(bci);
 616         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 617         if (i >= call->number_of_arguments()) {
 618           return false;
 619         }
 620         type = call->valid_argument_type(i);
 621         ptr_kind = call->argument_ptr_kind(i);
 622         return true;
 623       }
 624     }
 625   }
 626   return false;
 627 }
 628 
 629 /**
 630  * Check whether profiling provides a type for the return value from
 631  * the call at bci bci
 632  *
 633  * @param [in]bci         bci of the call
 634  * @param [out]type       profiled type of argument, NULL if none
 635  * @param [out]ptr_kind   whether always null, never null or maybe null
 636  * @return                true if profiling exists
 637  *
 638  */
 639 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 640   if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
 641     ciProfileData* data = method_data()->bci_to_data(bci);
 642     if (data != NULL) {
 643       if (data->is_VirtualCallTypeData()) {
 644         assert_virtual_call_type_ok(bci);
 645         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 646         if (call->has_return()) {
 647           type = call->valid_return_type();
 648           ptr_kind = call->return_ptr_kind();
 649           return true;
 650         }
 651       } else if (data->is_CallTypeData()) {
 652         assert_call_type_ok(bci);
 653         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 654         if (call->has_return()) {
 655           type = call->valid_return_type();
 656           ptr_kind = call->return_ptr_kind();
 657         }
 658         return true;
 659       }
 660     }
 661   }
 662   return false;
 663 }
 664 
 665 /**
 666  * Check whether profiling provides a type for the parameter i
 667  *
 668  * @param [in]i           parameter number
 669  * @param [out]type       profiled type of parameter, NULL if none
 670  * @param [out]ptr_kind   whether always null, never null or maybe null
 671  * @return                true if profiling exists
 672  *
 673  */
 674 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 675   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 676     ciParametersTypeData* parameters = method_data()->parameters_type_data();
 677     if (parameters != NULL && i < parameters->number_of_parameters()) {
 678       type = parameters->valid_parameter_type(i);
 679       ptr_kind = parameters->parameter_ptr_kind(i);
 680       return true;
 681     }
 682   }
 683   return false;
 684 }
 685 
 686 
 687 // ------------------------------------------------------------------
 688 // ciMethod::find_monomorphic_target
 689 //
 690 // Given a certain calling environment, find the monomorphic target
 691 // for the call.  Return NULL if the call is not monomorphic in
 692 // its calling environment, or if there are only abstract methods.
 693 // The returned method is never abstract.
 694 // Note: If caller uses a non-null result, it must inform dependencies
 695 // via assert_unique_concrete_method or assert_leaf_type.
 696 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
 697                                             ciInstanceKlass* callee_holder,
 698                                             ciInstanceKlass* actual_recv,
 699                                             bool check_access) {
 700   check_is_loaded();
 701 
 702   if (actual_recv->is_interface()) {
 703     // %%% We cannot trust interface types, yet.  See bug 6312651.
 704     return NULL;
 705   }
 706 
 707   ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access);
 708   if (root_m == NULL) {
 709     // Something went wrong looking up the actual receiver method.
 710     return NULL;
 711   }
 712   assert(!root_m->is_abstract(), "resolve_invoke promise");
 713 
 714   // Make certain quick checks even if UseCHA is false.
 715 
 716   // Is it private or final?
 717   if (root_m->can_be_statically_bound()) {
 718     return root_m;
 719   }
 720 
 721   if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
 722     // Easy case.  There is no other place to put a method, so don't bother
 723     // to go through the VM_ENTRY_MARK and all the rest.
 724     return root_m;
 725   }
 726 
 727   // Array methods (clone, hashCode, etc.) are always statically bound.
 728   // If we were to see an array type here, we'd return root_m.
 729   // However, this method processes only ciInstanceKlasses.  (See 4962591.)
 730   // The inline_native_clone intrinsic narrows Object to T[] properly,
 731   // so there is no need to do the same job here.
 732 
 733   if (!UseCHA)  return NULL;
 734 
 735   VM_ENTRY_MARK;
 736 
 737   // Disable CHA for default methods for now
 738   if (root_m->get_Method()->is_default_method()) {
 739     return NULL;
 740   }
 741 
 742   methodHandle target;
 743   {
 744     MutexLocker locker(Compile_lock);
 745     Klass* context = actual_recv->get_Klass();
 746     target = Dependencies::find_unique_concrete_method(context,
 747                                                        root_m->get_Method());
 748     // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
 749   }
 750 
 751 #ifndef PRODUCT
 752   if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
 753     tty->print("found a non-root unique target method");
 754     tty->print_cr("  context = %s", actual_recv->get_Klass()->external_name());
 755     tty->print("  method  = ");
 756     target->print_short_name(tty);
 757     tty->cr();
 758   }
 759 #endif //PRODUCT
 760 
 761   if (target() == NULL) {
 762     return NULL;
 763   }
 764   if (target() == root_m->get_Method()) {
 765     return root_m;
 766   }
 767   if (!root_m->is_public() &&
 768       !root_m->is_protected()) {
 769     // If we are going to reason about inheritance, it's easiest
 770     // if the method in question is public, protected, or private.
 771     // If the answer is not root_m, it is conservatively correct
 772     // to return NULL, even if the CHA encountered irrelevant
 773     // methods in other packages.
 774     // %%% TO DO: Work out logic for package-private methods
 775     // with the same name but different vtable indexes.
 776     return NULL;
 777   }
 778   return CURRENT_THREAD_ENV->get_method(target());
 779 }
 780 
 781 // ------------------------------------------------------------------
 782 // ciMethod::resolve_invoke
 783 //
 784 // Given a known receiver klass, find the target for the call.
 785 // Return NULL if the call has no target or the target is abstract.
 786 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access) {
 787    check_is_loaded();
 788    VM_ENTRY_MARK;
 789 
 790    Klass* caller_klass = caller->get_Klass();
 791    Klass* recv         = exact_receiver->get_Klass();
 792    Klass* resolved     = holder()->get_Klass();
 793    Symbol* h_name      = name()->get_symbol();
 794    Symbol* h_signature = signature()->get_symbol();
 795 
 796    LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
 797                       check_access ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
 798    methodHandle m;
 799    // Only do exact lookup if receiver klass has been linked.  Otherwise,
 800    // the vtable has not been setup, and the LinkResolver will fail.
 801    if (recv->is_array_klass()
 802         ||
 803        (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
 804      if (holder()->is_interface()) {
 805        m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
 806      } else {
 807        m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
 808      }
 809    }
 810 
 811    if (m.is_null()) {
 812      // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
 813      return NULL;
 814    }
 815 
 816    ciMethod* result = this;
 817    if (m() != get_Method()) {
 818      result = CURRENT_THREAD_ENV->get_method(m());
 819    }
 820 
 821    // Don't return abstract methods because they aren't
 822    // optimizable or interesting.
 823    if (result->is_abstract()) {
 824      return NULL;
 825    } else {
 826      return result;
 827    }
 828 }
 829 
 830 // ------------------------------------------------------------------
 831 // ciMethod::resolve_vtable_index
 832 //
 833 // Given a known receiver klass, find the vtable index for the call.
 834 // Return Method::invalid_vtable_index if the vtable_index is unknown.
 835 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
 836    check_is_loaded();
 837 
 838    int vtable_index = Method::invalid_vtable_index;
 839    // Only do lookup if receiver klass has been linked.  Otherwise,
 840    // the vtable has not been setup, and the LinkResolver will fail.
 841    if (!receiver->is_interface()
 842        && (!receiver->is_instance_klass() ||
 843            receiver->as_instance_klass()->is_linked())) {
 844      VM_ENTRY_MARK;
 845 
 846      Klass* caller_klass = caller->get_Klass();
 847      Klass* recv         = receiver->get_Klass();
 848      Symbol* h_name = name()->get_symbol();
 849      Symbol* h_signature = signature()->get_symbol();
 850 
 851      LinkInfo link_info(recv, h_name, h_signature, caller_klass);
 852      vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
 853      if (vtable_index == Method::nonvirtual_vtable_index) {
 854        // A statically bound method.  Return "no such index".
 855        vtable_index = Method::invalid_vtable_index;
 856      }
 857    }
 858 
 859    return vtable_index;
 860 }
 861 
 862 // ------------------------------------------------------------------
 863 // ciMethod::interpreter_call_site_count
 864 int ciMethod::interpreter_call_site_count(int bci) {
 865   if (method_data() != NULL) {
 866     ResourceMark rm;
 867     ciProfileData* data = method_data()->bci_to_data(bci);
 868     if (data != NULL && data->is_CounterData()) {
 869       return scale_count(data->as_CounterData()->count());
 870     }
 871   }
 872   return -1;  // unknown
 873 }
 874 
 875 // ------------------------------------------------------------------
 876 // ciMethod::get_field_at_bci
 877 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
 878   ciBytecodeStream iter(this);
 879   iter.reset_to_bci(bci);
 880   iter.next();
 881   return iter.get_field(will_link);
 882 }
 883 
 884 // ------------------------------------------------------------------
 885 // ciMethod::get_method_at_bci
 886 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
 887   ciBytecodeStream iter(this);
 888   iter.reset_to_bci(bci);
 889   iter.next();
 890   return iter.get_method(will_link, declared_signature);
 891 }
 892 
 893 // ------------------------------------------------------------------
 894 // Adjust a CounterData count to be commensurate with
 895 // interpreter_invocation_count.  If the MDO exists for
 896 // only 25% of the time the method exists, then the
 897 // counts in the MDO should be scaled by 4X, so that
 898 // they can be usefully and stably compared against the
 899 // invocation counts in methods.
 900 int ciMethod::scale_count(int count, float prof_factor) {
 901   if (count > 0 && method_data() != NULL) {
 902     int counter_life;
 903     int method_life = interpreter_invocation_count();
 904     if (TieredCompilation) {
 905       // In tiered the MDO's life is measured directly, so just use the snapshotted counters
 906       counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
 907     } else {
 908       int current_mileage = method_data()->current_mileage();
 909       int creation_mileage = method_data()->creation_mileage();
 910       counter_life = current_mileage - creation_mileage;
 911     }
 912 
 913     // counter_life due to backedge_counter could be > method_life
 914     if (counter_life > method_life)
 915       counter_life = method_life;
 916     if (0 < counter_life && counter_life <= method_life) {
 917       count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
 918       count = (count > 0) ? count : 1;
 919     }
 920   }
 921   return count;
 922 }
 923 
 924 
 925 // ------------------------------------------------------------------
 926 // ciMethod::is_special_get_caller_class_method
 927 //
 928 bool ciMethod::is_ignored_by_security_stack_walk() const {
 929   check_is_loaded();
 930   VM_ENTRY_MARK;
 931   return get_Method()->is_ignored_by_security_stack_walk();
 932 }
 933 
 934 
 935 // ------------------------------------------------------------------
 936 // invokedynamic support
 937 
 938 // ------------------------------------------------------------------
 939 // ciMethod::is_method_handle_intrinsic
 940 //
 941 // Return true if the method is an instance of the JVM-generated
 942 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
 943 bool ciMethod::is_method_handle_intrinsic() const {
 944   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 945   return (MethodHandles::is_signature_polymorphic(iid) &&
 946           MethodHandles::is_signature_polymorphic_intrinsic(iid));
 947 }
 948 
 949 // ------------------------------------------------------------------
 950 // ciMethod::is_compiled_lambda_form
 951 //
 952 // Return true if the method is a generated MethodHandle adapter.
 953 // These are built by Java code.
 954 bool ciMethod::is_compiled_lambda_form() const {
 955   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 956   return iid == vmIntrinsics::_compiledLambdaForm;
 957 }
 958 
 959 // ------------------------------------------------------------------
 960 // ciMethod::is_object_initializer
 961 //
 962 bool ciMethod::is_object_initializer() const {
 963    return name() == ciSymbol::object_initializer_name();
 964 }
 965 
 966 // ------------------------------------------------------------------
 967 // ciMethod::has_member_arg
 968 //
 969 // Return true if the method is a linker intrinsic like _linkToVirtual.
 970 // These are built by the JVM.
 971 bool ciMethod::has_member_arg() const {
 972   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 973   return (MethodHandles::is_signature_polymorphic(iid) &&
 974           MethodHandles::has_member_arg(iid));
 975 }
 976 
 977 // ------------------------------------------------------------------
 978 // ciMethod::ensure_method_data
 979 //
 980 // Generate new MethodData* objects at compile time.
 981 // Return true if allocation was successful or no MDO is required.
 982 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
 983   EXCEPTION_CONTEXT;
 984   if (is_native() || is_abstract() || h_m()->is_accessor()) {
 985     return true;
 986   }
 987   if (h_m()->method_data() == NULL) {
 988     Method::build_interpreter_method_data(h_m, THREAD);
 989     if (HAS_PENDING_EXCEPTION) {
 990       CLEAR_PENDING_EXCEPTION;
 991     }
 992   }
 993   if (h_m()->method_data() != NULL) {
 994     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
 995     _method_data->load_data();
 996     return true;
 997   } else {
 998     _method_data = CURRENT_ENV->get_empty_methodData();
 999     return false;
1000   }
1001 }
1002 
1003 // public, retroactive version
1004 bool ciMethod::ensure_method_data() {
1005   bool result = true;
1006   if (_method_data == NULL || _method_data->is_empty()) {
1007     GUARDED_VM_ENTRY({
1008       result = ensure_method_data(get_Method());
1009     });
1010   }
1011   return result;
1012 }
1013 
1014 
1015 // ------------------------------------------------------------------
1016 // ciMethod::method_data
1017 //
1018 ciMethodData* ciMethod::method_data() {
1019   if (_method_data != NULL) {
1020     return _method_data;
1021   }
1022   VM_ENTRY_MARK;
1023   ciEnv* env = CURRENT_ENV;
1024   Thread* my_thread = JavaThread::current();
1025   methodHandle h_m(my_thread, get_Method());
1026 
1027   if (h_m()->method_data() != NULL) {
1028     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1029     _method_data->load_data();
1030   } else {
1031     _method_data = CURRENT_ENV->get_empty_methodData();
1032   }
1033   return _method_data;
1034 
1035 }
1036 
1037 // ------------------------------------------------------------------
1038 // ciMethod::method_data_or_null
1039 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1040 // NULL otherwise.
1041 ciMethodData* ciMethod::method_data_or_null() {
1042   ciMethodData *md = method_data();
1043   if (md->is_empty()) {
1044     return NULL;
1045   }
1046   return md;
1047 }
1048 
1049 // ------------------------------------------------------------------
1050 // ciMethod::ensure_method_counters
1051 //
1052 MethodCounters* ciMethod::ensure_method_counters() {
1053   check_is_loaded();
1054   VM_ENTRY_MARK;
1055   methodHandle mh(THREAD, get_Method());
1056   MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1057   return method_counters;
1058 }
1059 
1060 // ------------------------------------------------------------------
1061 // ciMethod::has_option
1062 //
1063 bool ciMethod::has_option(const char* option) {
1064   check_is_loaded();
1065   VM_ENTRY_MARK;
1066   methodHandle mh(THREAD, get_Method());
1067   return CompilerOracle::has_option_string(mh, option);
1068 }
1069 
1070 // ------------------------------------------------------------------
1071 // ciMethod::has_option_value
1072 //
1073 bool ciMethod::has_option_value(const char* option, double& value) {
1074   check_is_loaded();
1075   VM_ENTRY_MARK;
1076   methodHandle mh(THREAD, get_Method());
1077   return CompilerOracle::has_option_value(mh, option, value);
1078 }
1079 // ------------------------------------------------------------------
1080 // ciMethod::can_be_compiled
1081 //
1082 // Have previous compilations of this method succeeded?
1083 bool ciMethod::can_be_compiled() {
1084   check_is_loaded();
1085   ciEnv* env = CURRENT_ENV;
1086   if (is_c1_compile(env->comp_level())) {
1087     return _is_c1_compilable;
1088   }
1089   return _is_c2_compilable;
1090 }
1091 
1092 // ------------------------------------------------------------------
1093 // ciMethod::set_not_compilable
1094 //
1095 // Tell the VM that this method cannot be compiled at all.
1096 void ciMethod::set_not_compilable(const char* reason) {
1097   check_is_loaded();
1098   VM_ENTRY_MARK;
1099   ciEnv* env = CURRENT_ENV;
1100   if (is_c1_compile(env->comp_level())) {
1101     _is_c1_compilable = false;
1102   } else {
1103     _is_c2_compilable = false;
1104   }
1105   get_Method()->set_not_compilable(env->comp_level(), true, reason);
1106 }
1107 
1108 // ------------------------------------------------------------------
1109 // ciMethod::can_be_osr_compiled
1110 //
1111 // Have previous compilations of this method succeeded?
1112 //
1113 // Implementation note: the VM does not currently keep track
1114 // of failed OSR compilations per bci.  The entry_bci parameter
1115 // is currently unused.
1116 bool ciMethod::can_be_osr_compiled(int entry_bci) {
1117   check_is_loaded();
1118   VM_ENTRY_MARK;
1119   ciEnv* env = CURRENT_ENV;
1120   return !get_Method()->is_not_osr_compilable(env->comp_level());
1121 }
1122 
1123 // ------------------------------------------------------------------
1124 // ciMethod::has_compiled_code
1125 bool ciMethod::has_compiled_code() {
1126   return instructions_size() > 0;
1127 }
1128 
1129 int ciMethod::comp_level() {
1130   check_is_loaded();
1131   VM_ENTRY_MARK;
1132   CompiledMethod* nm = get_Method()->code();
1133   if (nm != NULL) return nm->comp_level();
1134   return 0;
1135 }
1136 
1137 int ciMethod::highest_osr_comp_level() {
1138   check_is_loaded();
1139   VM_ENTRY_MARK;
1140   return get_Method()->highest_osr_comp_level();
1141 }
1142 
1143 // ------------------------------------------------------------------
1144 // ciMethod::code_size_for_inlining
1145 //
1146 // Code size for inlining decisions.  This method returns a code
1147 // size of 1 for methods which has the ForceInline annotation.
1148 int ciMethod::code_size_for_inlining() {
1149   check_is_loaded();
1150   if (get_Method()->force_inline()) {
1151     return 1;
1152   }
1153   return code_size();
1154 }
1155 
1156 // ------------------------------------------------------------------
1157 // ciMethod::instructions_size
1158 //
1159 // This is a rough metric for "fat" methods, compared before inlining
1160 // with InlineSmallCode.  The CodeBlob::code_size accessor includes
1161 // junk like exception handler, stubs, and constant table, which are
1162 // not highly relevant to an inlined method.  So we use the more
1163 // specific accessor nmethod::insts_size.
1164 int ciMethod::instructions_size() {
1165   if (_instructions_size == -1) {
1166     GUARDED_VM_ENTRY(
1167                      CompiledMethod* code = get_Method()->code();
1168                      if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1169                        _instructions_size = code->insts_end() - code->verified_entry_point();
1170                      } else {
1171                        _instructions_size = 0;
1172                      }
1173                      );
1174   }
1175   return _instructions_size;
1176 }
1177 
1178 // ------------------------------------------------------------------
1179 // ciMethod::log_nmethod_identity
1180 void ciMethod::log_nmethod_identity(xmlStream* log) {
1181   GUARDED_VM_ENTRY(
1182     CompiledMethod* code = get_Method()->code();
1183     if (code != NULL) {
1184       code->log_identity(log);
1185     }
1186   )
1187 }
1188 
1189 // ------------------------------------------------------------------
1190 // ciMethod::is_not_reached
1191 bool ciMethod::is_not_reached(int bci) {
1192   check_is_loaded();
1193   VM_ENTRY_MARK;
1194   return Interpreter::is_not_reached(
1195                methodHandle(THREAD, get_Method()), bci);
1196 }
1197 
1198 // ------------------------------------------------------------------
1199 // ciMethod::was_never_executed
1200 bool ciMethod::was_executed_more_than(int times) {
1201   VM_ENTRY_MARK;
1202   return get_Method()->was_executed_more_than(times);
1203 }
1204 
1205 // ------------------------------------------------------------------
1206 // ciMethod::has_unloaded_classes_in_signature
1207 bool ciMethod::has_unloaded_classes_in_signature() {
1208   VM_ENTRY_MARK;
1209   {
1210     EXCEPTION_MARK;
1211     methodHandle m(THREAD, get_Method());
1212     bool has_unloaded = Method::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
1213     if( HAS_PENDING_EXCEPTION ) {
1214       CLEAR_PENDING_EXCEPTION;
1215       return true;     // Declare that we may have unloaded classes
1216     }
1217     return has_unloaded;
1218   }
1219 }
1220 
1221 // ------------------------------------------------------------------
1222 // ciMethod::is_klass_loaded
1223 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1224   VM_ENTRY_MARK;
1225   return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1226 }
1227 
1228 // ------------------------------------------------------------------
1229 // ciMethod::check_call
1230 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1231   // This method is used only in C2 from InlineTree::ok_to_inline,
1232   // and is only used under -Xcomp or -XX:CompileTheWorld.
1233   // It appears to fail when applied to an invokeinterface call site.
1234   // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1235   VM_ENTRY_MARK;
1236   {
1237     EXCEPTION_MARK;
1238     HandleMark hm(THREAD);
1239     constantPoolHandle pool (THREAD, get_Method()->constants());
1240     Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1241     methodHandle spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1242     if (HAS_PENDING_EXCEPTION) {
1243       CLEAR_PENDING_EXCEPTION;
1244       return false;
1245     } else {
1246       return (spec_method->is_static() == is_static);
1247     }
1248   }
1249   return false;
1250 }
1251 
1252 // ------------------------------------------------------------------
1253 // ciMethod::profile_aging
1254 //
1255 // Should the method be compiled with an age counter?
1256 bool ciMethod::profile_aging() const {
1257   return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1258                           !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1259 }
1260 // ------------------------------------------------------------------
1261 // ciMethod::print_codes
1262 //
1263 // Print the bytecodes for this method.
1264 void ciMethod::print_codes_on(outputStream* st) {
1265   check_is_loaded();
1266   GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1267 }
1268 
1269 
1270 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1271   check_is_loaded(); \
1272   VM_ENTRY_MARK; \
1273   return get_Method()->flag_accessor(); \
1274 }
1275 
1276 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }
1277 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1278 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }
1279 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }
1280 bool ciMethod::is_getter      () const {         FETCH_FLAG_FROM_VM(is_getter); }
1281 bool ciMethod::is_setter      () const {         FETCH_FLAG_FROM_VM(is_setter); }
1282 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }
1283 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }
1284 
1285 bool ciMethod::is_boxing_method() const {
1286   if (holder()->is_box_klass()) {
1287     switch (intrinsic_id()) {
1288       case vmIntrinsics::_Boolean_valueOf:
1289       case vmIntrinsics::_Byte_valueOf:
1290       case vmIntrinsics::_Character_valueOf:
1291       case vmIntrinsics::_Short_valueOf:
1292       case vmIntrinsics::_Integer_valueOf:
1293       case vmIntrinsics::_Long_valueOf:
1294       case vmIntrinsics::_Float_valueOf:
1295       case vmIntrinsics::_Double_valueOf:
1296         return true;
1297       default:
1298         return false;
1299     }
1300   }
1301   return false;
1302 }
1303 
1304 bool ciMethod::is_unboxing_method() const {
1305   if (holder()->is_box_klass()) {
1306     switch (intrinsic_id()) {
1307       case vmIntrinsics::_booleanValue:
1308       case vmIntrinsics::_byteValue:
1309       case vmIntrinsics::_charValue:
1310       case vmIntrinsics::_shortValue:
1311       case vmIntrinsics::_intValue:
1312       case vmIntrinsics::_longValue:
1313       case vmIntrinsics::_floatValue:
1314       case vmIntrinsics::_doubleValue:
1315         return true;
1316       default:
1317         return false;
1318     }
1319   }
1320   return false;
1321 }
1322 
1323 BCEscapeAnalyzer  *ciMethod::get_bcea() {
1324 #ifdef COMPILER2
1325   if (_bcea == NULL) {
1326     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1327   }
1328   return _bcea;
1329 #else // COMPILER2
1330   ShouldNotReachHere();
1331   return NULL;
1332 #endif // COMPILER2
1333 }
1334 
1335 ciMethodBlocks  *ciMethod::get_method_blocks() {
1336   Arena *arena = CURRENT_ENV->arena();
1337   if (_method_blocks == NULL) {
1338     _method_blocks = new (arena) ciMethodBlocks(arena, this);
1339   }
1340   return _method_blocks;
1341 }
1342 
1343 #undef FETCH_FLAG_FROM_VM
1344 
1345 void ciMethod::dump_name_as_ascii(outputStream* st) {
1346   Method* method = get_Method();
1347   st->print("%s %s %s",
1348             method->klass_name()->as_quoted_ascii(),
1349             method->name()->as_quoted_ascii(),
1350             method->signature()->as_quoted_ascii());
1351 }
1352 
1353 void ciMethod::dump_replay_data(outputStream* st) {
1354   ResourceMark rm;
1355   Method* method = get_Method();
1356   MethodCounters* mcs = method->method_counters();
1357   st->print("ciMethod ");
1358   dump_name_as_ascii(st);
1359   st->print_cr(" %d %d %d %d %d",
1360                mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1361                mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1362                interpreter_invocation_count(),
1363                interpreter_throwout_count(),
1364                _instructions_size);
1365 }
1366 
1367 // ------------------------------------------------------------------
1368 // ciMethod::print_codes
1369 //
1370 // Print a range of the bytecodes for this method.
1371 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1372   check_is_loaded();
1373   GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1374 }
1375 
1376 // ------------------------------------------------------------------
1377 // ciMethod::print_name
1378 //
1379 // Print the name of this method, including signature and some flags.
1380 void ciMethod::print_name(outputStream* st) {
1381   check_is_loaded();
1382   GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1383 }
1384 
1385 // ------------------------------------------------------------------
1386 // ciMethod::print_short_name
1387 //
1388 // Print the name of this method, without signature.
1389 void ciMethod::print_short_name(outputStream* st) {
1390   if (is_loaded()) {
1391     GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1392   } else {
1393     // Fall back if method is not loaded.
1394     holder()->print_name_on(st);
1395     st->print("::");
1396     name()->print_symbol_on(st);
1397     if (WizardMode)
1398       signature()->as_symbol()->print_symbol_on(st);
1399   }
1400 }
1401 
1402 // ------------------------------------------------------------------
1403 // ciMethod::print_impl
1404 //
1405 // Implementation of the print method.
1406 void ciMethod::print_impl(outputStream* st) {
1407   ciMetadata::print_impl(st);
1408   st->print(" name=");
1409   name()->print_symbol_on(st);
1410   st->print(" holder=");
1411   holder()->print_name_on(st);
1412   st->print(" signature=");
1413   signature()->as_symbol()->print_symbol_on(st);
1414   if (is_loaded()) {
1415     st->print(" loaded=true");
1416     st->print(" arg_size=%d", arg_size());
1417     st->print(" flags=");
1418     flags().print_member_flags(st);
1419   } else {
1420     st->print(" loaded=false");
1421   }
1422 }
1423 
1424 // ------------------------------------------------------------------
1425 
1426 static BasicType erase_to_word_type(BasicType bt) {
1427   if (is_subword_type(bt)) return T_INT;
1428   if (bt == T_ARRAY)       return T_OBJECT;
1429   return bt;
1430 }
1431 
1432 static bool basic_types_match(ciType* t1, ciType* t2) {
1433   if (t1 == t2)  return true;
1434   return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1435 }
1436 
1437 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1438   bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1439                                   !resolved_method->is_method_handle_intrinsic();
1440 
1441   if (!invoke_through_mh_intrinsic) {
1442     // Method name & descriptor should stay the same.
1443     // Signatures may reference unloaded types and thus they may be not strictly equal.
1444     ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1445     ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1446 
1447     return (declared_method->name()->equals(resolved_method->name())) &&
1448            (declared_signature->equals(resolved_signature));
1449   }
1450 
1451   ciMethod* linker = declared_method;
1452   ciMethod* target = resolved_method;
1453   // Linkers have appendix argument which is not passed to callee.
1454   int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1455   if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1456     return false; // argument slot count mismatch
1457   }
1458 
1459   ciSignature* linker_sig = linker->signature();
1460   ciSignature* target_sig = target->signature();
1461 
1462   if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1463       target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1464     return false; // argument count mismatch
1465   }
1466 
1467   int sbase = 0, rbase = 0;
1468   switch (linker->intrinsic_id()) {
1469     case vmIntrinsics::_linkToVirtual:
1470     case vmIntrinsics::_linkToInterface:
1471     case vmIntrinsics::_linkToSpecial: {
1472       if (target->is_static()) {
1473         return false;
1474       }
1475       if (linker_sig->type_at(0)->is_primitive_type()) {
1476         return false;  // receiver should be an oop
1477       }
1478       sbase = 1; // skip receiver
1479       break;
1480     }
1481     case vmIntrinsics::_linkToStatic: {
1482       if (!target->is_static()) {
1483         return false;
1484       }
1485       break;
1486     }
1487     case vmIntrinsics::_invokeBasic: {
1488       if (target->is_static()) {
1489         if (target_sig->type_at(0)->is_primitive_type()) {
1490           return false; // receiver should be an oop
1491         }
1492         rbase = 1; // skip receiver
1493       }
1494       break;
1495     }
1496     default:
1497       break;
1498   }
1499   assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1500   int arg_count = target_sig->count() - rbase;
1501   for (int i = 0; i < arg_count; i++) {
1502     if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1503       return false;
1504     }
1505   }
1506   // Only check the return type if the symbolic info has non-void return type.
1507   // I.e. the return value of the resolved method can be dropped.
1508   if (!linker->return_type()->is_void() &&
1509       !basic_types_match(linker->return_type(), target->return_type())) {
1510     return false;
1511   }
1512   return true; // no mismatch found
1513 }
1514 
1515 // ------------------------------------------------------------------
1516 
1517 #if INCLUDE_TRACE
1518 TraceStructCalleeMethod ciMethod::to_trace_struct() const {
1519   TraceStructCalleeMethod result;
1520   result.set_type(holder()->name()->as_utf8());
1521   result.set_name(name()->as_utf8());
1522   result.set_descriptor(signature()->as_symbol()->as_utf8());
1523   return result;
1524 }
1525 #endif