1 /*
   2  * Copyright (c) 1999, 2024, 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 "cds/classPreloader.hpp"
  27 #include "ci/ciCallProfile.hpp"
  28 #include "ci/ciExceptionHandler.hpp"
  29 #include "ci/ciInstanceKlass.hpp"
  30 #include "ci/ciMethod.hpp"
  31 #include "ci/ciMethodBlocks.hpp"
  32 #include "ci/ciMethodData.hpp"
  33 #include "ci/ciStreams.hpp"
  34 #include "ci/ciSymbol.hpp"
  35 #include "ci/ciReplay.hpp"
  36 #include "ci/ciSymbols.hpp"
  37 #include "ci/ciUtilities.inline.hpp"
  38 #include "compiler/compileTask.hpp"
  39 #include "compiler/abstractCompiler.hpp"
  40 #include "compiler/compilerDefinitions.inline.hpp"
  41 #include "compiler/compilerOracle.hpp"
  42 #include "compiler/methodLiveness.hpp"
  43 #include "interpreter/interpreter.hpp"
  44 #include "interpreter/linkResolver.hpp"
  45 #include "interpreter/oopMapCache.hpp"
  46 #include "logging/log.hpp"
  47 #include "logging/logStream.hpp"
  48 #include "memory/allocation.inline.hpp"
  49 #include "memory/resourceArea.hpp"
  50 #include "oops/generateOopMap.hpp"
  51 #include "oops/method.inline.hpp"
  52 #include "oops/oop.inline.hpp"
  53 #include "oops/trainingData.hpp"
  54 #include "prims/methodHandles.hpp"
  55 #include "runtime/deoptimization.hpp"
  56 #include "runtime/handles.inline.hpp"
  57 #include "utilities/bitMap.inline.hpp"
  58 #include "utilities/xmlstream.hpp"
  59 #ifdef COMPILER2
  60 #include "ci/bcEscapeAnalyzer.hpp"
  61 #include "ci/ciTypeFlow.hpp"
  62 #include "oops/method.hpp"
  63 #endif
  64 
  65 // ciMethod
  66 //
  67 // This class represents a Method* in the HotSpot virtual
  68 // machine.
  69 
  70 
  71 // ------------------------------------------------------------------
  72 // ciMethod::ciMethod
  73 //
  74 // Loaded method.
  75 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
  76   ciMetadata(h_m()),
  77   _holder(holder)
  78 {
  79   assert(h_m() != nullptr, "no null method");
  80   assert(_holder->get_instanceKlass() == h_m->method_holder(), "");
  81 
  82   // These fields are always filled in in loaded methods.
  83   _flags = ciFlags(h_m->access_flags());
  84 
  85   // Easy to compute, so fill them in now.
  86   _max_stack          = h_m->max_stack();
  87   _max_locals         = h_m->max_locals();
  88   _code_size          = h_m->code_size();
  89   _handler_count      = h_m->exception_table_length();
  90   _size_of_parameters = h_m->size_of_parameters();
  91   _uses_monitors      = h_m->has_monitor_bytecodes();
  92   _balanced_monitors  = !_uses_monitors || h_m->guaranteed_monitor_matching();
  93   _is_c1_compilable   = !h_m->is_not_c1_compilable();
  94   _is_c2_compilable   = !h_m->is_not_c2_compilable();
  95   _can_be_parsed      = true;
  96   _has_reserved_stack_access = h_m->has_reserved_stack_access();
  97   _is_overpass        = h_m->is_overpass();
  98   // Lazy fields, filled in on demand.  Require allocation.
  99   _code               = nullptr;
 100   _exception_handlers = nullptr;
 101   _liveness           = nullptr;
 102   _method_blocks = nullptr;
 103 #if defined(COMPILER2)
 104   _flow               = nullptr;
 105   _bcea               = nullptr;
 106 #endif // COMPILER2
 107 
 108   // Check for blackhole intrinsic and then populate the intrinsic ID.
 109   CompilerOracle::tag_blackhole_if_possible(h_m);
 110   _intrinsic_id       = h_m->intrinsic_id();
 111 
 112   ciEnv *env = CURRENT_ENV;
 113   if (env->jvmti_can_hotswap_or_post_breakpoint()) {
 114     // 6328518 check hotswap conditions under the right lock.
 115     MutexLocker locker(Compile_lock);
 116     if (Dependencies::check_evol_method(h_m()) != nullptr) {
 117       _is_c1_compilable = false;
 118       _is_c2_compilable = false;
 119       _can_be_parsed = false;
 120     }
 121   } else {
 122     DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
 123   }
 124 
 125   if (h_m->method_holder()->is_linked()) {
 126     _can_be_statically_bound = h_m->can_be_statically_bound();
 127     _can_omit_stack_trace = h_m->can_omit_stack_trace();
 128   } else {
 129     // Have to use a conservative value in this case.
 130     _can_be_statically_bound = false;
 131     _can_omit_stack_trace = true;
 132   }
 133 
 134   // Adjust the definition of this condition to be more useful:
 135   // %%% take these conditions into account in vtable generation
 136   if (!_can_be_statically_bound && h_m->is_private())
 137     _can_be_statically_bound = true;
 138   if (_can_be_statically_bound && h_m->is_abstract())
 139     _can_be_statically_bound = false;
 140 
 141   // generating _signature may allow GC and therefore move m.
 142   // These fields are always filled in.
 143   _name = env->get_symbol(h_m->name());
 144   ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
 145   constantPoolHandle cpool(Thread::current(), h_m->constants());
 146   _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
 147   _method_data = nullptr;
 148   _method_data_recorded = nullptr;
 149   // Take a snapshot of these values, so they will be commensurate with the MDO.
 150   if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
 151     int invcnt = h_m->interpreter_invocation_count();
 152     // if the value overflowed report it as max int
 153     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
 154     _interpreter_throwout_count   = h_m->interpreter_throwout_count();
 155   } else {
 156     _interpreter_invocation_count = 0;
 157     _interpreter_throwout_count = 0;
 158   }
 159   if (_interpreter_invocation_count == 0)
 160     _interpreter_invocation_count = 1;
 161   _inline_instructions_size = -1;
 162   if (ReplayCompiles) {
 163     ciReplay::initialize(this);
 164   }
 165   DirectiveSet* directives = DirectivesStack::getMatchingDirective(h_m, CURRENT_ENV->task()->compiler());
 166   ccstrlist bci_list = directives->TooManyTrapsAtBCIOption;
 167   int len = (int)strlen(bci_list);
 168   Arena* arena = CURRENT_ENV->arena();
 169   _has_trap_at_bci = new (arena) GrowableArray<int>(arena, 2, 0, 0);
 170   for (int i = 0; i < len; i++) {
 171     int v = -1;
 172     int read;
 173     if (sscanf(bci_list + i, "%i%n", &v, &read) != 1) {
 174       warning("wrong format for TooManyTrapsAtBCI option: \"%s\"", bci_list);
 175       break;
 176     }
 177     assert(v >= 0 && v < (1<<16), "%i", v);
 178     _has_trap_at_bci->append_if_missing(v);
 179     i += read;
 180   }
 181 }
 182 
 183 
 184 // ------------------------------------------------------------------
 185 // ciMethod::ciMethod
 186 //
 187 // Unloaded method.
 188 ciMethod::ciMethod(ciInstanceKlass* holder,
 189                    ciSymbol*        name,
 190                    ciSymbol*        signature,
 191                    ciInstanceKlass* accessor) :
 192   ciMetadata((Metadata*)nullptr),
 193   _name(                   name),
 194   _holder(                 holder),
 195   _method_data(            nullptr),
 196   _method_data_recorded(   nullptr),
 197   _method_blocks(          nullptr),
 198   _intrinsic_id(           vmIntrinsics::_none),
 199   _inline_instructions_size(-1),
 200   _can_be_statically_bound(false),
 201   _can_omit_stack_trace(true),
 202   _has_trap_at_bci(        nullptr),
 203   _liveness(               nullptr)
 204 #if defined(COMPILER2)
 205   ,
 206   _flow(                   nullptr),
 207   _bcea(                   nullptr)
 208 #endif // COMPILER2
 209 {
 210   // Usually holder and accessor are the same type but in some cases
 211   // the holder has the wrong class loader (e.g. invokedynamic call
 212   // sites) so we pass the accessor.
 213   _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
 214 }
 215 
 216 
 217 // ------------------------------------------------------------------
 218 // ciMethod::load_code
 219 //
 220 // Load the bytecodes and exception handler table for this method.
 221 void ciMethod::load_code() {
 222   VM_ENTRY_MARK;
 223   assert(is_loaded(), "only loaded methods have code");
 224 
 225   Method* me = get_Method();
 226   Arena* arena = CURRENT_THREAD_ENV->arena();
 227 
 228   // Load the bytecodes.
 229   _code = (address)arena->Amalloc(code_size());
 230   memcpy(_code, me->code_base(), code_size());
 231 
 232 #if INCLUDE_JVMTI
 233   // Revert any breakpoint bytecodes in ci's copy
 234   if (me->number_of_breakpoints() > 0) {
 235     BreakpointInfo* bp = me->method_holder()->breakpoints();
 236     for (; bp != nullptr; bp = bp->next()) {
 237       if (bp->match(me)) {
 238         code_at_put(bp->bci(), bp->orig_bytecode());
 239       }
 240     }
 241   }
 242 #endif
 243 
 244   // And load the exception table.
 245   ExceptionTable exc_table(me);
 246 
 247   // Allocate one extra spot in our list of exceptions.  This
 248   // last entry will be used to represent the possibility that
 249   // an exception escapes the method.  See ciExceptionHandlerStream
 250   // for details.
 251   _exception_handlers =
 252     (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
 253                                          * (_handler_count + 1));
 254   if (_handler_count > 0) {
 255     for (int i=0; i<_handler_count; i++) {
 256       _exception_handlers[i] = new (arena) ciExceptionHandler(
 257                                 holder(),
 258             /* start    */      exc_table.start_pc(i),
 259             /* limit    */      exc_table.end_pc(i),
 260             /* goto pc  */      exc_table.handler_pc(i),
 261             /* cp index */      exc_table.catch_type_index(i));
 262     }
 263   }
 264 
 265   // Put an entry at the end of our list to represent the possibility
 266   // of exceptional exit.
 267   _exception_handlers[_handler_count] =
 268     new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
 269 
 270   if (CIPrintMethodCodes) {
 271     print_codes();
 272   }
 273 }
 274 
 275 
 276 // ------------------------------------------------------------------
 277 // ciMethod::has_linenumber_table
 278 //
 279 // length unknown until decompression
 280 bool    ciMethod::has_linenumber_table() const {
 281   check_is_loaded();
 282   VM_ENTRY_MARK;
 283   return get_Method()->has_linenumber_table();
 284 }
 285 
 286 
 287 // ------------------------------------------------------------------
 288 // ciMethod::line_number_from_bci
 289 int ciMethod::line_number_from_bci(int bci) const {
 290   check_is_loaded();
 291   VM_ENTRY_MARK;
 292   return get_Method()->line_number_from_bci(bci);
 293 }
 294 
 295 
 296 // ------------------------------------------------------------------
 297 // ciMethod::vtable_index
 298 //
 299 // Get the position of this method's entry in the vtable, if any.
 300 int ciMethod::vtable_index() {
 301   check_is_loaded();
 302   assert(holder()->is_linked(), "must be linked");
 303   VM_ENTRY_MARK;
 304   return get_Method()->vtable_index();
 305 }
 306 
 307 // ------------------------------------------------------------------
 308 // ciMethod::uses_balanced_monitors
 309 //
 310 // Does this method use monitors in a strict stack-disciplined manner?
 311 bool ciMethod::has_balanced_monitors() {
 312   check_is_loaded();
 313   if (_balanced_monitors) return true;
 314 
 315   // Analyze the method to see if monitors are used properly.
 316   VM_ENTRY_MARK;
 317   methodHandle method(THREAD, get_Method());
 318   assert(method->has_monitor_bytecodes(), "should have checked this");
 319 
 320   // Check to see if a previous compilation computed the
 321   // monitor-matching analysis.
 322   if (method->guaranteed_monitor_matching()) {
 323     _balanced_monitors = true;
 324     return true;
 325   }
 326 
 327   {
 328     ExceptionMark em(THREAD);
 329     ResourceMark rm(THREAD);
 330     GeneratePairingInfo gpi(method);
 331     if (!gpi.compute_map(THREAD)) {
 332       fatal("Unrecoverable verification or out-of-memory error");
 333     }
 334     if (!gpi.monitor_safe()) {
 335       return false;
 336     }
 337     method->set_guaranteed_monitor_matching();
 338     _balanced_monitors = true;
 339   }
 340   return true;
 341 }
 342 
 343 
 344 // ------------------------------------------------------------------
 345 // ciMethod::get_flow_analysis
 346 ciTypeFlow* ciMethod::get_flow_analysis() {
 347 #if defined(COMPILER2)
 348   if (_flow == nullptr) {
 349     ciEnv* env = CURRENT_ENV;
 350     _flow = new (env->arena()) ciTypeFlow(env, this);
 351     _flow->do_flow();
 352   }
 353   return _flow;
 354 #else // COMPILER2
 355   ShouldNotReachHere();
 356   return nullptr;
 357 #endif // COMPILER2
 358 }
 359 
 360 
 361 // ------------------------------------------------------------------
 362 // ciMethod::get_osr_flow_analysis
 363 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
 364 #if defined(COMPILER2)
 365   // OSR entry points are always place after a call bytecode of some sort
 366   assert(osr_bci >= 0, "must supply valid OSR entry point");
 367   ciEnv* env = CURRENT_ENV;
 368   ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
 369   flow->do_flow();
 370   return flow;
 371 #else // COMPILER2
 372   ShouldNotReachHere();
 373   return nullptr;
 374 #endif // COMPILER2
 375 }
 376 
 377 // ------------------------------------------------------------------
 378 // ciMethod::raw_liveness_at_bci
 379 //
 380 // Which local variables are live at a specific bci?
 381 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
 382   check_is_loaded();
 383   if (_liveness == nullptr) {
 384     // Create the liveness analyzer.
 385     Arena* arena = CURRENT_ENV->arena();
 386     _liveness = new (arena) MethodLiveness(arena, this);
 387     _liveness->compute_liveness();
 388   }
 389   return _liveness->get_liveness_at(bci);
 390 }
 391 
 392 // ------------------------------------------------------------------
 393 // ciMethod::liveness_at_bci
 394 //
 395 // Which local variables are live at a specific bci?  When debugging
 396 // will return true for all locals in some cases to improve debug
 397 // information.
 398 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
 399   if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
 400     // Keep all locals live for the user's edification and amusement.
 401     MethodLivenessResult result(_max_locals);
 402     result.set_range(0, _max_locals);
 403     result.set_is_valid();
 404     return result;
 405   }
 406   return raw_liveness_at_bci(bci);
 407 }
 408 
 409 // ciMethod::live_local_oops_at_bci
 410 //
 411 // find all the live oops in the locals array for a particular bci
 412 // Compute what the interpreter believes by using the interpreter
 413 // oopmap generator. This is used as a double check during osr to
 414 // guard against conservative result from MethodLiveness making us
 415 // think a dead oop is live.  MethodLiveness is conservative in the
 416 // sense that it may consider locals to be live which cannot be live,
 417 // like in the case where a local could contain an oop or  a primitive
 418 // along different paths.  In that case the local must be dead when
 419 // those paths merge. Since the interpreter's viewpoint is used when
 420 // gc'ing an interpreter frame we need to use its viewpoint  during
 421 // OSR when loading the locals.
 422 
 423 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
 424   VM_ENTRY_MARK;
 425   InterpreterOopMap mask;
 426   OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
 427   int mask_size = max_locals();
 428   ResourceBitMap result(mask_size);
 429   int i;
 430   for (i = 0; i < mask_size ; i++ ) {
 431     if (mask.is_oop(i)) result.set_bit(i);
 432   }
 433   return result;
 434 }
 435 
 436 
 437 #ifdef COMPILER1
 438 // ------------------------------------------------------------------
 439 // ciMethod::bci_block_start
 440 //
 441 // Marks all bcis where a new basic block starts
 442 const BitMap& ciMethod::bci_block_start() {
 443   check_is_loaded();
 444   if (_liveness == nullptr) {
 445     // Create the liveness analyzer.
 446     Arena* arena = CURRENT_ENV->arena();
 447     _liveness = new (arena) MethodLiveness(arena, this);
 448     _liveness->compute_liveness();
 449   }
 450 
 451   return _liveness->get_bci_block_start();
 452 }
 453 #endif // COMPILER1
 454 
 455 
 456 // ------------------------------------------------------------------
 457 // ciMethod::check_overflow
 458 //
 459 // Check whether the profile counter is overflowed and adjust if true.
 460 // For invoke* it will turn negative values into max_jint,
 461 // and for checkcast/aastore/instanceof turn positive values into min_jint.
 462 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
 463   switch (code) {
 464     case Bytecodes::_aastore:    // fall-through
 465     case Bytecodes::_checkcast:  // fall-through
 466     case Bytecodes::_instanceof: {
 467       if (VM_Version::profile_all_receivers_at_type_check()) {
 468         return (c < 0 ? max_jint : c); // always non-negative
 469       }
 470       return (c > 0 ? min_jint : c); // always non-positive
 471     }
 472     default: {
 473       assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
 474       return (c < 0 ? max_jint : c); // always non-negative
 475     }
 476   }
 477 }
 478 
 479 
 480 // ------------------------------------------------------------------
 481 // ciMethod::call_profile_at_bci
 482 //
 483 // Get the ciCallProfile for the invocation of this method.
 484 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
 485 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
 486   ResourceMark rm;
 487   ciCallProfile result;
 488   if (method_data() != nullptr && method_data()->is_mature()) {
 489     ciProfileData* data = method_data()->bci_to_data(bci);
 490     if (data != nullptr && data->is_CounterData()) {
 491       // Every profiled call site has a counter.
 492       int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
 493 
 494       if (!data->is_ReceiverTypeData()) {
 495         result._receiver_count[0] = 0;  // that's a definite zero
 496       } else { // ReceiverTypeData is a subclass of CounterData
 497         ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
 498         // In addition, virtual call sites have receiver type information
 499         int receivers_count_total = 0;
 500         int morphism = 0;
 501         // Precompute morphism for the possible fixup
 502         for (uint i = 0; i < call->row_limit(); i++) {
 503           ciKlass* receiver = call->receiver(i);
 504           if (receiver == nullptr)  continue;
 505           morphism++;
 506         }
 507         int epsilon = 0;
 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         for (uint i = 0; i < call->row_limit(); i++) {
 517           ciKlass* receiver = call->receiver(i);
 518           if (receiver == nullptr)  continue;
 519           int rcount = saturated_add(call->receiver_count(i), epsilon);
 520           if (rcount == 0) rcount = 1; // Should be valid value
 521           receivers_count_total = saturated_add(receivers_count_total, rcount);
 522           // Add the receiver to result data.
 523           result.add_receiver(receiver, rcount);
 524           // If we extend profiling to record methods,
 525           // we will set result._method also.
 526         }
 527         // Determine call site's morphism.
 528         // The call site count is 0 with known morphism (only 1 or 2 receivers)
 529         // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
 530         // The call site count is > 0 in the case of a polymorphic virtual call.
 531         if (morphism > 0 && morphism == result._limit) {
 532            // The morphism <= MorphismLimit.
 533            if ((morphism <  ciCallProfile::MorphismLimit) ||
 534                (morphism == ciCallProfile::MorphismLimit && count == 0)) {
 535 #ifdef ASSERT
 536              if (count > 0) {
 537                this->print_short_name(tty);
 538                tty->print_cr(" @ bci:%d", bci);
 539                this->print_codes();
 540                assert(false, "this call site should not be polymorphic");
 541              }
 542 #endif
 543              result._morphism = morphism;
 544            }
 545         }
 546         // Make the count consistent if this is a call profile. If count is
 547         // zero or less, presume that this is a typecheck profile and
 548         // do nothing.  Otherwise, increase count to be the sum of all
 549         // receiver's counts.
 550         if (count >= 0) {
 551           count = saturated_add(count, receivers_count_total);
 552         }
 553       }
 554       result._count = count;
 555     }
 556   }
 557   return result;
 558 }
 559 
 560 // ------------------------------------------------------------------
 561 // Add new receiver and sort data by receiver's profile count.
 562 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
 563   // Add new receiver and sort data by receiver's counts when we have space
 564   // for it otherwise replace the less called receiver (less called receiver
 565   // is placed to the last array element which is not used).
 566   // First array's element contains most called receiver.
 567   int i = _limit;
 568   for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
 569     _receiver[i] = _receiver[i-1];
 570     _receiver_count[i] = _receiver_count[i-1];
 571   }
 572   _receiver[i] = receiver;
 573   _receiver_count[i] = receiver_count;
 574   if (_limit < MorphismLimit) _limit++;
 575 }
 576 
 577 
 578 void ciMethod::assert_virtual_call_type_ok(int bci) {
 579   assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
 580          java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 581 }
 582 
 583 void ciMethod::assert_call_type_ok(int bci) {
 584   assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
 585          java_code_at_bci(bci) == Bytecodes::_invokespecial ||
 586          java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 587 }
 588 
 589 /**
 590  * Check whether profiling provides a type for the argument i to the
 591  * call at bci bci
 592  *
 593  * @param [in]bci         bci of the call
 594  * @param [in]i           argument number
 595  * @param [out]type       profiled type of argument, null if none
 596  * @param [out]ptr_kind   whether always null, never null or maybe null
 597  * @return                true if profiling exists
 598  *
 599  */
 600 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 601   if (MethodData::profile_parameters() && method_data() != nullptr && method_data()->is_mature()) {
 602     ciProfileData* data = method_data()->bci_to_data(bci);
 603     if (data != nullptr) {
 604       if (data->is_VirtualCallTypeData()) {
 605         assert_virtual_call_type_ok(bci);
 606         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 607         if (i >= call->number_of_arguments()) {
 608           return false;
 609         }
 610         type = call->valid_argument_type(i);
 611         ptr_kind = call->argument_ptr_kind(i);
 612         return true;
 613       } else if (data->is_CallTypeData()) {
 614         assert_call_type_ok(bci);
 615         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 616         if (i >= call->number_of_arguments()) {
 617           return false;
 618         }
 619         type = call->valid_argument_type(i);
 620         ptr_kind = call->argument_ptr_kind(i);
 621         return true;
 622       }
 623     }
 624   }
 625   return false;
 626 }
 627 
 628 /**
 629  * Check whether profiling provides a type for the return value from
 630  * the call at bci bci
 631  *
 632  * @param [in]bci         bci of the call
 633  * @param [out]type       profiled type of argument, null if none
 634  * @param [out]ptr_kind   whether always null, never null or maybe null
 635  * @return                true if profiling exists
 636  *
 637  */
 638 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 639   if (MethodData::profile_return() && method_data() != nullptr && method_data()->is_mature()) {
 640     ciProfileData* data = method_data()->bci_to_data(bci);
 641     if (data != nullptr) {
 642       if (data->is_VirtualCallTypeData()) {
 643         assert_virtual_call_type_ok(bci);
 644         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 645         if (call->has_return()) {
 646           type = call->valid_return_type();
 647           ptr_kind = call->return_ptr_kind();
 648           return true;
 649         }
 650       } else if (data->is_CallTypeData()) {
 651         assert_call_type_ok(bci);
 652         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 653         if (call->has_return()) {
 654           type = call->valid_return_type();
 655           ptr_kind = call->return_ptr_kind();
 656         }
 657         return true;
 658       }
 659     }
 660   }
 661   return false;
 662 }
 663 
 664 /**
 665  * Check whether profiling provides a type for the parameter i
 666  *
 667  * @param [in]i           parameter number
 668  * @param [out]type       profiled type of parameter, null if none
 669  * @param [out]ptr_kind   whether always null, never null or maybe null
 670  * @return                true if profiling exists
 671  *
 672  */
 673 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 674   if (MethodData::profile_parameters() && method_data() != nullptr && method_data()->is_mature()) {
 675     ciParametersTypeData* parameters = method_data()->parameters_type_data();
 676     if (parameters != nullptr && i < parameters->number_of_parameters()) {
 677       type = parameters->valid_parameter_type(i);
 678       ptr_kind = parameters->parameter_ptr_kind(i);
 679       return true;
 680     }
 681   }
 682   return false;
 683 }
 684 
 685 
 686 // ------------------------------------------------------------------
 687 // ciMethod::find_monomorphic_target
 688 //
 689 // Given a certain calling environment, find the monomorphic target
 690 // for the call.  Return null if the call is not monomorphic in
 691 // its calling environment, or if there are only abstract methods.
 692 // The returned method is never abstract.
 693 // Note: If caller uses a non-null result, it must inform dependencies
 694 // via assert_unique_concrete_method or assert_leaf_type.
 695 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
 696                                             ciInstanceKlass* callee_holder,
 697                                             ciInstanceKlass* actual_recv,
 698                                             bool check_access) {
 699   check_is_loaded();
 700 
 701   if (actual_recv->is_interface()) {
 702     // %%% We cannot trust interface types, yet.  See bug 6312651.
 703     return nullptr;
 704   }
 705 
 706   ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
 707   if (root_m == nullptr) {
 708     // Something went wrong looking up the actual receiver method.
 709     return nullptr;
 710   }
 711 
 712   // Make certain quick checks even if UseCHA is false.
 713 
 714   // Is it private or final?
 715   if (root_m->can_be_statically_bound()) {
 716     assert(!root_m->is_abstract(), "sanity");
 717     return root_m;
 718   }
 719 
 720   if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
 721     // Easy case.  There is no other place to put a method, so don't bother
 722     // to go through the VM_ENTRY_MARK and all the rest.
 723     if (root_m->is_abstract()) {
 724       return nullptr;
 725     }
 726     return root_m;
 727   }
 728 
 729   // Array methods (clone, hashCode, etc.) are always statically bound.
 730   // If we were to see an array type here, we'd return root_m.
 731   // However, this method processes only ciInstanceKlasses.  (See 4962591.)
 732   // The inline_native_clone intrinsic narrows Object to T[] properly,
 733   // so there is no need to do the same job here.
 734 
 735   if (!UseCHA)  return nullptr;
 736 
 737   VM_ENTRY_MARK;
 738 
 739   methodHandle target;
 740   {
 741     MutexLocker locker(Compile_lock);
 742     InstanceKlass* context = actual_recv->get_instanceKlass();
 743     target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
 744                                                                             root_m->get_Method(),
 745                                                                             callee_holder->get_Klass(),
 746                                                                             this->get_Method()));
 747     assert(target() == nullptr || !target()->is_abstract(), "not allowed");
 748     // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
 749   }
 750 
 751 #ifndef PRODUCT
 752   LogTarget(Debug, dependencies) lt;
 753   if (lt.is_enabled() && target() != nullptr && target() != root_m->get_Method()) {
 754     LogStream ls(&lt);
 755     ls.print("found a non-root unique target method");
 756     ls.print_cr("  context = %s", actual_recv->get_Klass()->external_name());
 757     ls.print("  method  = ");
 758     target->print_short_name(&ls);
 759     ls.cr();
 760   }
 761 #endif //PRODUCT
 762 
 763   if (target() == nullptr) {
 764     return nullptr;
 765   }
 766   if (target() == root_m->get_Method()) {
 767     return root_m;
 768   }
 769   if (!root_m->is_public() &&
 770       !root_m->is_protected()) {
 771     // If we are going to reason about inheritance, it's easiest
 772     // if the method in question is public, protected, or private.
 773     // If the answer is not root_m, it is conservatively correct
 774     // to return null, even if the CHA encountered irrelevant
 775     // methods in other packages.
 776     // %%% TO DO: Work out logic for package-private methods
 777     // with the same name but different vtable indexes.
 778     return nullptr;
 779   }
 780   return CURRENT_THREAD_ENV->get_method(target());
 781 }
 782 
 783 // ------------------------------------------------------------------
 784 // ciMethod::can_be_statically_bound
 785 //
 786 // Tries to determine whether a method can be statically bound in some context.
 787 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
 788   return (holder() == context) && can_be_statically_bound();
 789 }
 790 
 791 // ------------------------------------------------------------------
 792 // ciMethod::can_omit_stack_trace
 793 //
 794 // Tries to determine whether a method can omit stack trace in throw in compiled code.
 795 bool ciMethod::can_omit_stack_trace() const {
 796   if (!StackTraceInThrowable) {
 797     return true; // stack trace is switched off.
 798   }
 799   if (!OmitStackTraceInFastThrow) {
 800     return false; // Have to provide stack trace.
 801   }
 802   return _can_omit_stack_trace;
 803 }
 804 
 805 // ------------------------------------------------------------------
 806 // ciMethod::resolve_invoke
 807 //
 808 // Given a known receiver klass, find the target for the call.
 809 // Return null if the call has no target or the target is abstract.
 810 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
 811   check_is_loaded();
 812   VM_ENTRY_MARK;
 813 
 814   Klass* caller_klass = caller->get_Klass();
 815   Klass* recv         = exact_receiver->get_Klass();
 816   Klass* resolved     = holder()->get_Klass();
 817   Symbol* h_name      = name()->get_symbol();
 818   Symbol* h_signature = signature()->get_symbol();
 819 
 820   LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
 821                      check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
 822                      check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
 823   Method* m = nullptr;
 824   // Only do exact lookup if receiver klass has been linked.  Otherwise,
 825   // the vtable has not been setup, and the LinkResolver will fail.
 826   if (recv->is_array_klass()
 827        ||
 828       (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
 829     if (holder()->is_interface()) {
 830       m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
 831     } else {
 832       m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
 833     }
 834   }
 835 
 836   if (m == nullptr) {
 837     // Return null only if there was a problem with lookup (uninitialized class, etc.)
 838     return nullptr;
 839   }
 840 
 841   ciMethod* result = this;
 842   if (m != get_Method()) {
 843     result = CURRENT_THREAD_ENV->get_method(m);
 844   }
 845 
 846   if (result->is_abstract() && !allow_abstract) {
 847     // Don't return abstract methods because they aren't optimizable or interesting.
 848     return nullptr;
 849   }
 850   return result;
 851 }
 852 
 853 // ------------------------------------------------------------------
 854 // ciMethod::resolve_vtable_index
 855 //
 856 // Given a known receiver klass, find the vtable index for the call.
 857 // Return Method::invalid_vtable_index if the vtable_index is unknown.
 858 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
 859    check_is_loaded();
 860 
 861    int vtable_index = Method::invalid_vtable_index;
 862    // Only do lookup if receiver klass has been linked.  Otherwise,
 863    // the vtable has not been setup, and the LinkResolver will fail.
 864    if (!receiver->is_interface()
 865        && (!receiver->is_instance_klass() ||
 866            receiver->as_instance_klass()->is_linked())) {
 867      VM_ENTRY_MARK;
 868 
 869      Klass* caller_klass = caller->get_Klass();
 870      Klass* recv         = receiver->get_Klass();
 871      Symbol* h_name = name()->get_symbol();
 872      Symbol* h_signature = signature()->get_symbol();
 873 
 874      LinkInfo link_info(recv, h_name, h_signature, caller_klass);
 875      vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
 876      if (vtable_index == Method::nonvirtual_vtable_index) {
 877        // A statically bound method.  Return "no such index".
 878        vtable_index = Method::invalid_vtable_index;
 879      }
 880    }
 881 
 882    return vtable_index;
 883 }
 884 
 885 // ------------------------------------------------------------------
 886 // ciMethod::get_field_at_bci
 887 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
 888   ciBytecodeStream iter(this);
 889   iter.reset_to_bci(bci);
 890   iter.next();
 891   return iter.get_field(will_link);
 892 }
 893 
 894 // ------------------------------------------------------------------
 895 // ciMethod::get_method_at_bci
 896 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
 897   ciBytecodeStream iter(this);
 898   iter.reset_to_bci(bci);
 899   iter.next();
 900   return iter.get_method(will_link, declared_signature);
 901 }
 902 
 903 // ------------------------------------------------------------------
 904 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
 905   ciBytecodeStream iter(this);
 906   iter.reset_to_bci(bci);
 907   iter.next();
 908   return iter.get_declared_method_holder();
 909 }
 910 
 911 // ------------------------------------------------------------------
 912 // Adjust a CounterData count to be commensurate with
 913 // interpreter_invocation_count.  If the MDO exists for
 914 // only 25% of the time the method exists, then the
 915 // counts in the MDO should be scaled by 4X, so that
 916 // they can be usefully and stably compared against the
 917 // invocation counts in methods.
 918 int ciMethod::scale_count(int count, float prof_factor) {
 919   if (count > 0 && method_data() != nullptr) {
 920     int counter_life = method_data()->invocation_count();
 921     int method_life = interpreter_invocation_count();
 922     if (method_life < counter_life) { // may happen because of the snapshot timing
 923       method_life = counter_life;
 924     }
 925     if (counter_life > 0) {
 926       count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
 927       count = (count > 0) ? count : 1;
 928     } else {
 929       count = 1;
 930     }
 931   }
 932   return count;
 933 }
 934 
 935 
 936 // ------------------------------------------------------------------
 937 // ciMethod::is_special_get_caller_class_method
 938 //
 939 bool ciMethod::is_ignored_by_security_stack_walk() const {
 940   check_is_loaded();
 941   VM_ENTRY_MARK;
 942   return get_Method()->is_ignored_by_security_stack_walk();
 943 }
 944 
 945 // ------------------------------------------------------------------
 946 // ciMethod::needs_clinit_barrier
 947 //
 948 bool ciMethod::needs_clinit_barrier() const {
 949   check_is_loaded();
 950   return is_static() && !holder()->is_initialized();
 951 }
 952 
 953 // ------------------------------------------------------------------
 954 // invokedynamic support
 955 
 956 // ------------------------------------------------------------------
 957 // ciMethod::is_method_handle_intrinsic
 958 //
 959 // Return true if the method is an instance of the JVM-generated
 960 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
 961 bool ciMethod::is_method_handle_intrinsic() const {
 962   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 963   return (MethodHandles::is_signature_polymorphic(iid) &&
 964           MethodHandles::is_signature_polymorphic_intrinsic(iid));
 965 }
 966 
 967 // ------------------------------------------------------------------
 968 // ciMethod::is_compiled_lambda_form
 969 //
 970 // Return true if the method is a generated MethodHandle adapter.
 971 // These are built by Java code.
 972 bool ciMethod::is_compiled_lambda_form() const {
 973   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 974   return iid == vmIntrinsics::_compiledLambdaForm;
 975 }
 976 
 977 // ------------------------------------------------------------------
 978 // ciMethod::is_object_initializer
 979 //
 980 bool ciMethod::is_object_initializer() const {
 981    return name() == ciSymbols::object_initializer_name();
 982 }
 983 
 984 // ------------------------------------------------------------------
 985 // ciMethod::has_member_arg
 986 //
 987 // Return true if the method is a linker intrinsic like _linkToVirtual.
 988 // These are built by the JVM.
 989 bool ciMethod::has_member_arg() const {
 990   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 991   return (MethodHandles::is_signature_polymorphic(iid) &&
 992           MethodHandles::has_member_arg(iid));
 993 }
 994 
 995 // ------------------------------------------------------------------
 996 // ciMethod::ensure_method_data
 997 //
 998 // Generate new MethodData* objects at compile time.
 999 // Return true if allocation was successful or no MDO is required.
1000 bool ciMethod::ensure_method_data(const methodHandle& h_m, bool training_data_only) {
1001   EXCEPTION_CONTEXT;
1002   if (is_native() || is_abstract() || h_m()->is_accessor()) {
1003     return true;
1004   }
1005   if (h_m()->method_data() == nullptr) {
1006     if (training_data_only) {
1007       Method::install_training_method_data(h_m);
1008     } else {
1009       Method::build_profiling_method_data(h_m, THREAD);
1010       if (HAS_PENDING_EXCEPTION) {
1011         CLEAR_PENDING_EXCEPTION;
1012       }
1013     }
1014   }
1015   if (h_m()->method_data() != nullptr) {
1016     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1017     return _method_data->load_data();
1018   } else {
1019     _method_data = CURRENT_ENV->get_empty_methodData();
1020     return false;
1021   }
1022 }
1023 
1024 // public, retroactive version
1025 bool ciMethod::ensure_method_data(bool training_data_only) {
1026   bool result = true;
1027   if (_method_data == nullptr || _method_data->is_empty()) {
1028     GUARDED_VM_ENTRY({
1029       methodHandle mh(Thread::current(), get_Method());
1030       result = ensure_method_data(mh, training_data_only);
1031     });
1032   }
1033   return result;
1034 }
1035 
1036 
1037 // ------------------------------------------------------------------
1038 // ciMethod::method_data
1039 //
1040 ciMethodData* ciMethod::method_data() {
1041   if (CURRENT_ENV->task()->is_precompiled() && CURRENT_ENV->task()->comp_level() == CompLevel_full_optimization) {
1042     if (_method_data_recorded == nullptr) {
1043       VM_ENTRY_MARK;
1044       methodHandle h_m(thread, get_Method());
1045       MethodTrainingData* mtd = TrainingData::lookup_for(h_m());
1046       MethodData* mdo = (mtd != nullptr ? mtd->final_profile() : nullptr);
1047       DirectiveSet* directives = DirectivesStack::getMatchingDirective(h_m, CURRENT_ENV->task()->compiler());
1048       if (mdo == nullptr || directives->IgnoreRecordedProfileOption) {
1049         if (directives->IgnoreRecordedProfileOption) {
1050           ResourceMark rm;
1051           log_debug(precompile)("Ignore recorded profile for %s", h_m->name_and_sig_as_C_string());
1052         } else {
1053           ResourceMark rm;
1054           log_debug(precompile)("No profile for %s", h_m->name_and_sig_as_C_string());
1055         }
1056         _method_data_recorded = CURRENT_ENV->get_empty_methodData();
1057       } else {
1058         if (mdo->extra_data_lock() == nullptr) {
1059           assert(!HAS_PENDING_EXCEPTION, "");
1060           mdo->restore_unshareable_info(thread);
1061           assert(!HAS_PENDING_EXCEPTION, "");
1062         }
1063         _method_data_recorded = CURRENT_ENV->get_method_data(mdo);
1064         _method_data_recorded->load_data();
1065         {
1066           ResourceMark rm;
1067           log_debug(precompile)("Recorded profile " PTR_FORMAT " for %s", p2i(mdo), h_m->name_and_sig_as_C_string());
1068         }
1069       }
1070     }
1071     assert(_method_data_recorded != nullptr, "");
1072     return _method_data_recorded;
1073   } else {
1074     if (_method_data != nullptr) {
1075       return _method_data;
1076     }
1077     VM_ENTRY_MARK;
1078     methodHandle h_m(thread, get_Method());
1079     MethodData* mdo = h_m()->method_data();
1080     if (mdo != nullptr) {
1081       _method_data = CURRENT_ENV->get_method_data(mdo);
1082       _method_data->load_data();
1083     } else {
1084       _method_data = CURRENT_ENV->get_empty_methodData();
1085     }
1086     return _method_data;
1087   }
1088 }
1089 
1090 // ------------------------------------------------------------------
1091 // ciMethod::method_data_or_null
1092 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1093 // null otherwise.
1094 ciMethodData* ciMethod::method_data_or_null() {
1095   ciMethodData *md = method_data();
1096   if (md->is_empty()) {
1097     return nullptr;
1098   }
1099   return md;
1100 }
1101 
1102 // ------------------------------------------------------------------
1103 // ciMethod::ensure_method_counters
1104 //
1105 MethodCounters* ciMethod::ensure_method_counters() {
1106   check_is_loaded();
1107   VM_ENTRY_MARK;
1108   methodHandle mh(THREAD, get_Method());
1109   MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1110   return method_counters;
1111 }
1112 
1113 // ------------------------------------------------------------------
1114 // ciMethod::has_option
1115 //
1116 bool ciMethod::has_option(CompileCommandEnum option) {
1117   check_is_loaded();
1118   VM_ENTRY_MARK;
1119   methodHandle mh(THREAD, get_Method());
1120   return CompilerOracle::has_option(mh, option);
1121 }
1122 
1123 // ------------------------------------------------------------------
1124 // ciMethod::has_option_value
1125 //
1126 bool ciMethod::has_option_value(CompileCommandEnum option, double& value) {
1127   check_is_loaded();
1128   VM_ENTRY_MARK;
1129   methodHandle mh(THREAD, get_Method());
1130   return CompilerOracle::has_option_value(mh, option, value);
1131 }
1132 // ------------------------------------------------------------------
1133 // ciMethod::can_be_compiled
1134 //
1135 // Have previous compilations of this method succeeded?
1136 bool ciMethod::can_be_compiled() {
1137   check_is_loaded();
1138   ciEnv* env = CURRENT_ENV;
1139   if (is_c1_compile(env->comp_level())) {
1140     return _is_c1_compilable;
1141   }
1142 
1143 #if INCLUDE_JVMCI
1144   if (EnableJVMCI && UseJVMCICompiler &&
1145       env->comp_level() == CompLevel_full_optimization && !ClassPreloader::class_preloading_finished()) {
1146     return false;
1147   }
1148 #endif
1149   return _is_c2_compilable;
1150 }
1151 
1152 // ------------------------------------------------------------------
1153 // ciMethod::has_compiled_code
1154 bool ciMethod::has_compiled_code() {
1155   return inline_instructions_size() > 0;
1156 }
1157 
1158 int ciMethod::highest_osr_comp_level() {
1159   check_is_loaded();
1160   VM_ENTRY_MARK;
1161   return get_Method()->highest_osr_comp_level();
1162 }
1163 
1164 // ------------------------------------------------------------------
1165 // ciMethod::code_size_for_inlining
1166 //
1167 // Code size for inlining decisions.  This method returns a code
1168 // size of 1 for methods which has the ForceInline annotation.
1169 int ciMethod::code_size_for_inlining() {
1170   check_is_loaded();
1171   if (get_Method()->force_inline()) {
1172     return 1;
1173   }
1174   return code_size();
1175 }
1176 
1177 // ------------------------------------------------------------------
1178 // ciMethod::inline_instructions_size
1179 //
1180 // This is a rough metric for "fat" methods, compared before inlining
1181 // with InlineSmallCode.  The CodeBlob::code_size accessor includes
1182 // junk like exception handler, stubs, and constant table, which are
1183 // not highly relevant to an inlined method.  So we use the more
1184 // specific accessor nmethod::insts_size.
1185 // Also some instructions inside the code are excluded from inline
1186 // heuristic (e.g. post call nop instructions; see InlineSkippedInstructionsCounter)
1187 int ciMethod::inline_instructions_size() {
1188   if (_inline_instructions_size == -1) {
1189     if (TrainingData::have_data()) {
1190       GUARDED_VM_ENTRY(
1191         CompLevel level = static_cast<CompLevel>(CURRENT_ENV->comp_level());
1192         methodHandle top_level_mh(Thread::current(), CURRENT_ENV->task()->method());
1193         MethodTrainingData* mtd = MethodTrainingData::find(top_level_mh);
1194         if (mtd != nullptr) {
1195           CompileTrainingData* ctd = mtd->last_toplevel_compile(level);
1196           if (ctd != nullptr) {
1197             methodHandle mh(Thread::current(), get_Method());
1198             MethodTrainingData* this_mtd = MethodTrainingData::find(mh);
1199             if (this_mtd != nullptr) {
1200               auto r = ctd->ci_records().ciMethod__inline_instructions_size.find(this_mtd);
1201               if (r.is_valid()) {
1202                 _inline_instructions_size = r.result();
1203               }
1204             }
1205           }
1206         }
1207       );
1208     }
1209   }
1210   if (_inline_instructions_size == -1) {
1211     GUARDED_VM_ENTRY(
1212       nmethod* code = get_Method()->code();
1213       if (code != nullptr && !code->is_scc() && (code->comp_level() == CompLevel_full_optimization)) {
1214         int isize = code->insts_end() - code->verified_entry_point() - code->skipped_instructions_size();
1215         _inline_instructions_size = isize > 0 ? isize : 0;
1216       } else {
1217         _inline_instructions_size = 0;
1218       }
1219       if (TrainingData::need_data()) {
1220         CompileTrainingData* ctd = CURRENT_ENV->task()->training_data();
1221         if (ctd != nullptr) {
1222           methodHandle mh(Thread::current(), get_Method());
1223           MethodTrainingData* this_mtd = MethodTrainingData::make(mh);
1224           ctd->ci_records().ciMethod__inline_instructions_size.append_if_missing(_inline_instructions_size, this_mtd);
1225         }
1226       }
1227     );
1228   }
1229   return _inline_instructions_size;
1230 }
1231 
1232 // ------------------------------------------------------------------
1233 // ciMethod::log_nmethod_identity
1234 void ciMethod::log_nmethod_identity(xmlStream* log) {
1235   GUARDED_VM_ENTRY(
1236     nmethod* code = get_Method()->code();
1237     if (code != nullptr) {
1238       code->log_identity(log);
1239     }
1240   )
1241 }
1242 
1243 // ------------------------------------------------------------------
1244 // ciMethod::is_not_reached
1245 bool ciMethod::is_not_reached(int bci) {
1246   check_is_loaded();
1247   VM_ENTRY_MARK;
1248   return Interpreter::is_not_reached(
1249                methodHandle(THREAD, get_Method()), bci);
1250 }
1251 
1252 // ------------------------------------------------------------------
1253 // ciMethod::was_never_executed
1254 bool ciMethod::was_executed_more_than(int times) {
1255   // Invocation counter is reset when the Method* is compiled.
1256   // If the method has compiled code we therefore assume it has
1257   // be executed more than n times.
1258   if (is_accessor() || is_empty() || has_compiled_code()) {
1259     // interpreter doesn't bump invocation counter of trivial methods
1260     // compiler does not bump invocation counter of compiled methods
1261     return true;
1262   }
1263   if (!method_data()->is_empty()) {
1264     return (method_data()->invocation_count() > times);
1265   }
1266   VM_ENTRY_MARK;
1267   return get_Method()->was_executed_more_than(times);
1268 }
1269 
1270 // ------------------------------------------------------------------
1271 // ciMethod::has_unloaded_classes_in_signature
1272 bool ciMethod::has_unloaded_classes_in_signature() {
1273   // ciSignature is resolved against some accessing class and
1274   // signature classes aren't required to be local. As a benefit,
1275   // it makes signature classes visible through loader constraints.
1276   // So, encountering an unloaded class signals it is absent both in
1277   // the callee (local) and caller contexts.
1278   return signature()->has_unloaded_classes();
1279 }
1280 
1281 // ------------------------------------------------------------------
1282 // ciMethod::is_klass_loaded
1283 bool ciMethod::is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved) const {
1284   VM_ENTRY_MARK;
1285   return get_Method()->is_klass_loaded(refinfo_index, bc, must_be_resolved);
1286 }
1287 
1288 // ------------------------------------------------------------------
1289 // ciMethod::check_call
1290 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1291   // This method is used only in C2 from InlineTree::ok_to_inline,
1292   // and is only used under -Xcomp.
1293   // It appears to fail when applied to an invokeinterface call site.
1294   // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1295   VM_ENTRY_MARK;
1296   {
1297     ExceptionMark em(THREAD);
1298     HandleMark hm(THREAD);
1299     constantPoolHandle pool (THREAD, get_Method()->constants());
1300     Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1301     Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1302     if (HAS_PENDING_EXCEPTION) {
1303       CLEAR_PENDING_EXCEPTION;
1304       return false;
1305     } else {
1306       return (spec_method->is_static() == is_static);
1307     }
1308   }
1309   return false;
1310 }
1311 // ------------------------------------------------------------------
1312 // ciMethod::print_codes
1313 //
1314 // Print the bytecodes for this method.
1315 void ciMethod::print_codes_on(outputStream* st) {
1316   check_is_loaded();
1317   GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1318 }
1319 
1320 
1321 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1322   check_is_loaded(); \
1323   VM_ENTRY_MARK; \
1324   return get_Method()->flag_accessor(); \
1325 }
1326 
1327 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }
1328 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }
1329 bool ciMethod::is_getter      () const {         FETCH_FLAG_FROM_VM(is_getter); }
1330 bool ciMethod::is_setter      () const {         FETCH_FLAG_FROM_VM(is_setter); }
1331 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }
1332 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }
1333 bool ciMethod::is_empty       () const {         FETCH_FLAG_FROM_VM(is_empty_method); }
1334 
1335 bool ciMethod::is_boxing_method() const {
1336   if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1337     switch (intrinsic_id()) {
1338       case vmIntrinsics::_Boolean_valueOf:
1339       case vmIntrinsics::_Byte_valueOf:
1340       case vmIntrinsics::_Character_valueOf:
1341       case vmIntrinsics::_Short_valueOf:
1342       case vmIntrinsics::_Integer_valueOf:
1343       case vmIntrinsics::_Long_valueOf:
1344       case vmIntrinsics::_Float_valueOf:
1345       case vmIntrinsics::_Double_valueOf:
1346         return true;
1347       default:
1348         return false;
1349     }
1350   }
1351   return false;
1352 }
1353 
1354 bool ciMethod::is_unboxing_method() const {
1355   if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1356     switch (intrinsic_id()) {
1357       case vmIntrinsics::_booleanValue:
1358       case vmIntrinsics::_byteValue:
1359       case vmIntrinsics::_charValue:
1360       case vmIntrinsics::_shortValue:
1361       case vmIntrinsics::_intValue:
1362       case vmIntrinsics::_longValue:
1363       case vmIntrinsics::_floatValue:
1364       case vmIntrinsics::_doubleValue:
1365         return true;
1366       default:
1367         return false;
1368     }
1369   }
1370   return false;
1371 }
1372 
1373 bool ciMethod::is_vector_method() const {
1374   return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1375          (intrinsic_id() != vmIntrinsics::_none);
1376 }
1377 
1378 BCEscapeAnalyzer  *ciMethod::get_bcea() {
1379 #ifdef COMPILER2
1380   if (_bcea == nullptr) {
1381     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, nullptr);
1382   }
1383   return _bcea;
1384 #else // COMPILER2
1385   ShouldNotReachHere();
1386   return nullptr;
1387 #endif // COMPILER2
1388 }
1389 
1390 ciMethodBlocks  *ciMethod::get_method_blocks() {
1391   if (_method_blocks == nullptr) {
1392     Arena *arena = CURRENT_ENV->arena();
1393     _method_blocks = new (arena) ciMethodBlocks(arena, this);
1394   }
1395   return _method_blocks;
1396 }
1397 
1398 #undef FETCH_FLAG_FROM_VM
1399 
1400 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1401   st->print("%s %s %s",
1402             CURRENT_ENV->replay_name(method->method_holder()),
1403             method->name()->as_quoted_ascii(),
1404             method->signature()->as_quoted_ascii());
1405 }
1406 
1407 void ciMethod::dump_name_as_ascii(outputStream* st) {
1408   Method* method = get_Method();
1409   dump_name_as_ascii(st, method);
1410 }
1411 
1412 void ciMethod::dump_replay_data(outputStream* st) {
1413   ResourceMark rm;
1414   Method* method = get_Method();
1415   if (MethodHandles::is_signature_polymorphic_method(method)) {
1416     // ignore for now
1417     return;
1418   }
1419   MethodCounters* mcs = method->method_counters();
1420   st->print("ciMethod ");
1421   dump_name_as_ascii(st);
1422   st->print_cr(" %d %d %d %d %d",
1423                mcs == nullptr ? 0 : mcs->invocation_counter()->raw_counter(),
1424                mcs == nullptr ? 0 : mcs->backedge_counter()->raw_counter(),
1425                interpreter_invocation_count(),
1426                interpreter_throwout_count(),
1427                _inline_instructions_size);
1428 }
1429 
1430 // ------------------------------------------------------------------
1431 // ciMethod::print_codes
1432 //
1433 // Print a range of the bytecodes for this method.
1434 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1435   check_is_loaded();
1436   GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1437 }
1438 
1439 // ------------------------------------------------------------------
1440 // ciMethod::print_name
1441 //
1442 // Print the name of this method, including signature and some flags.
1443 void ciMethod::print_name(outputStream* st) {
1444   check_is_loaded();
1445   GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1446 }
1447 
1448 // ------------------------------------------------------------------
1449 // ciMethod::print_short_name
1450 //
1451 // Print the name of this method, without signature.
1452 void ciMethod::print_short_name(outputStream* st) {
1453   if (is_loaded()) {
1454     GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1455   } else {
1456     // Fall back if method is not loaded.
1457     holder()->print_name_on(st);
1458     st->print("::");
1459     name()->print_symbol_on(st);
1460     if (WizardMode)
1461       signature()->as_symbol()->print_symbol_on(st);
1462   }
1463 }
1464 
1465 // ------------------------------------------------------------------
1466 // ciMethod::print_impl
1467 //
1468 // Implementation of the print method.
1469 void ciMethod::print_impl(outputStream* st) {
1470   ciMetadata::print_impl(st);
1471   st->print(" name=");
1472   name()->print_symbol_on(st);
1473   st->print(" holder=");
1474   holder()->print_name_on(st);
1475   st->print(" signature=");
1476   signature()->as_symbol()->print_symbol_on(st);
1477   if (is_loaded()) {
1478     st->print(" loaded=true");
1479     st->print(" arg_size=%d", arg_size());
1480     st->print(" flags=");
1481     flags().print_member_flags(st);
1482   } else {
1483     st->print(" loaded=false");
1484   }
1485 }
1486 
1487 // ------------------------------------------------------------------
1488 
1489 static BasicType erase_to_word_type(BasicType bt) {
1490   if (is_subword_type(bt))   return T_INT;
1491   if (is_reference_type(bt)) return T_OBJECT;
1492   return bt;
1493 }
1494 
1495 static bool basic_types_match(ciType* t1, ciType* t2) {
1496   if (t1 == t2)  return true;
1497   return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1498 }
1499 
1500 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1501   bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1502                                   !resolved_method->is_method_handle_intrinsic();
1503 
1504   if (!invoke_through_mh_intrinsic) {
1505     // Method name & descriptor should stay the same.
1506     // Signatures may reference unloaded types and thus they may be not strictly equal.
1507     ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1508     ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1509 
1510     return (declared_method->name()->equals(resolved_method->name())) &&
1511            (declared_signature->equals(resolved_signature));
1512   }
1513 
1514   ciMethod* linker = declared_method;
1515   ciMethod* target = resolved_method;
1516   // Linkers have appendix argument which is not passed to callee.
1517   int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1518   if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1519     return false; // argument slot count mismatch
1520   }
1521 
1522   ciSignature* linker_sig = linker->signature();
1523   ciSignature* target_sig = target->signature();
1524 
1525   if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1526       target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1527     return false; // argument count mismatch
1528   }
1529 
1530   int sbase = 0, rbase = 0;
1531   switch (linker->intrinsic_id()) {
1532     case vmIntrinsics::_linkToVirtual:
1533     case vmIntrinsics::_linkToInterface:
1534     case vmIntrinsics::_linkToSpecial: {
1535       if (target->is_static()) {
1536         return false;
1537       }
1538       if (linker_sig->type_at(0)->is_primitive_type()) {
1539         return false;  // receiver should be an oop
1540       }
1541       sbase = 1; // skip receiver
1542       break;
1543     }
1544     case vmIntrinsics::_linkToStatic: {
1545       if (!target->is_static()) {
1546         return false;
1547       }
1548       break;
1549     }
1550     case vmIntrinsics::_invokeBasic: {
1551       if (target->is_static()) {
1552         if (target_sig->type_at(0)->is_primitive_type()) {
1553           return false; // receiver should be an oop
1554         }
1555         rbase = 1; // skip receiver
1556       }
1557       break;
1558     }
1559     default:
1560       break;
1561   }
1562   assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1563   int arg_count = target_sig->count() - rbase;
1564   for (int i = 0; i < arg_count; i++) {
1565     if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1566       return false;
1567     }
1568   }
1569   // Only check the return type if the symbolic info has non-void return type.
1570   // I.e. the return value of the resolved method can be dropped.
1571   if (!linker->return_type()->is_void() &&
1572       !basic_types_match(linker->return_type(), target->return_type())) {
1573     return false;
1574   }
1575   return true; // no mismatch found
1576 }
1577 
1578 // ------------------------------------------------------------------