1 /*
   2  * Copyright (c) 1999, 2021, 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/ciSymbols.hpp"
  36 #include "ci/ciUtilities.inline.hpp"
  37 #include "compiler/abstractCompiler.hpp"
  38 #include "compiler/methodLiveness.hpp"
  39 #include "interpreter/interpreter.hpp"
  40 #include "interpreter/linkResolver.hpp"
  41 #include "interpreter/oopMapCache.hpp"
  42 #include "memory/allocation.inline.hpp"
  43 #include "memory/resourceArea.hpp"
  44 #include "oops/generateOopMap.hpp"
  45 #include "oops/method.inline.hpp"
  46 #include "oops/oop.inline.hpp"
  47 #include "prims/methodHandles.hpp"
  48 #include "runtime/deoptimization.hpp"
  49 #include "runtime/handles.inline.hpp"
  50 #include "runtime/sharedRuntime.hpp"
  51 #include "utilities/bitMap.inline.hpp"
  52 #include "utilities/xmlstream.hpp"
  53 #ifdef COMPILER2
  54 #include "ci/bcEscapeAnalyzer.hpp"
  55 #include "ci/ciTypeFlow.hpp"
  56 #include "oops/method.hpp"
  57 #endif
  58 
  59 // ciMethod
  60 //
  61 // This class represents a Method* in the HotSpot virtual
  62 // machine.
  63 
  64 
  65 // ------------------------------------------------------------------
  66 // ciMethod::ciMethod
  67 //
  68 // Loaded method.
  69 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
  70   ciMetadata(h_m()),
  71   _holder(holder)
  72 {
  73   assert(h_m() != NULL, "no null method");
  74   assert(_holder->get_instanceKlass() == h_m->method_holder(), "");
  75 
  76   if (LogTouchedMethods) {
  77     h_m->log_touched(Thread::current());
  78   }
  79   // These fields are always filled in in loaded methods.
  80   _flags = ciFlags(h_m->access_flags());
  81 
  82   // Easy to compute, so fill them in now.
  83   _max_stack          = h_m->max_stack();
  84   _max_locals         = h_m->max_locals();
  85   _code_size          = h_m->code_size();
  86   _intrinsic_id       = h_m->intrinsic_id();
  87   _handler_count      = h_m->exception_table_length();
  88   _size_of_parameters = h_m->size_of_parameters();
  89   _uses_monitors      = h_m->access_flags().has_monitor_bytecodes();
  90   _balanced_monitors  = !_uses_monitors || h_m->access_flags().is_monitor_matching();
  91   _is_c1_compilable   = !h_m->is_not_c1_compilable();
  92   _is_c2_compilable   = !h_m->is_not_c2_compilable();
  93   _can_be_parsed      = true;
  94   _has_reserved_stack_access = h_m->has_reserved_stack_access();
  95   _is_overpass        = h_m->is_overpass();
  96   // Lazy fields, filled in on demand.  Require allocation.
  97   _code               = NULL;
  98   _exception_handlers = NULL;
  99   _liveness           = NULL;
 100   _method_blocks = NULL;
 101 #if defined(COMPILER2)
 102   _flow               = NULL;
 103   _bcea               = NULL;
 104 #endif // COMPILER2
 105 
 106   ciEnv *env = CURRENT_ENV;
 107   if (env->jvmti_can_hotswap_or_post_breakpoint()) {
 108     // 6328518 check hotswap conditions under the right lock.
 109     MutexLocker locker(Compile_lock);
 110     if (Dependencies::check_evol_method(h_m()) != NULL) {
 111       _is_c1_compilable = false;
 112       _is_c2_compilable = false;
 113       _can_be_parsed = false;
 114     }
 115   } else {
 116     DEBUG_ONLY(CompilerThread::current()->check_possible_safepoint());
 117   }
 118 
 119   if (h_m->method_holder()->is_linked()) {
 120     _can_be_statically_bound = h_m->can_be_statically_bound();
 121     _can_omit_stack_trace = h_m->can_omit_stack_trace();
 122   } else {
 123     // Have to use a conservative value in this case.
 124     _can_be_statically_bound = false;
 125     _can_omit_stack_trace = true;
 126   }
 127 
 128   // Adjust the definition of this condition to be more useful:
 129   // %%% take these conditions into account in vtable generation
 130   if (!_can_be_statically_bound && h_m->is_private())
 131     _can_be_statically_bound = true;
 132   if (_can_be_statically_bound && h_m->is_abstract())
 133     _can_be_statically_bound = false;
 134 
 135   // generating _signature may allow GC and therefore move m.
 136   // These fields are always filled in.
 137   _name = env->get_symbol(h_m->name());
 138   ciSymbol* sig_symbol = env->get_symbol(h_m->signature());
 139   constantPoolHandle cpool(Thread::current(), h_m->constants());
 140   _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
 141   _method_data = NULL;
 142   _nmethod_age = h_m->nmethod_age();
 143   // Take a snapshot of these values, so they will be commensurate with the MDO.
 144   if (ProfileInterpreter || CompilerConfig::is_c1_profiling()) {
 145     int invcnt = h_m->interpreter_invocation_count();
 146     // if the value overflowed report it as max int
 147     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
 148     _interpreter_throwout_count   = h_m->interpreter_throwout_count();
 149   } else {
 150     _interpreter_invocation_count = 0;
 151     _interpreter_throwout_count = 0;
 152   }
 153   if (_interpreter_invocation_count == 0)
 154     _interpreter_invocation_count = 1;
 155   _instructions_size = -1;
 156 #ifdef ASSERT
 157   if (ReplayCompiles) {
 158     ciReplay::initialize(this);
 159   }
 160 #endif
 161 
 162   CompilerOracle::tag_blackhole_if_possible(h_m);
 163 }
 164 
 165 
 166 // ------------------------------------------------------------------
 167 // ciMethod::ciMethod
 168 //
 169 // Unloaded method.
 170 ciMethod::ciMethod(ciInstanceKlass* holder,
 171                    ciSymbol*        name,
 172                    ciSymbol*        signature,
 173                    ciInstanceKlass* accessor) :
 174   ciMetadata((Metadata*)NULL),
 175   _name(                   name),
 176   _holder(                 holder),
 177   _method_data(            NULL),
 178   _method_blocks(          NULL),
 179   _intrinsic_id(           vmIntrinsics::_none),
 180   _instructions_size(-1),
 181   _can_be_statically_bound(false),
 182   _can_omit_stack_trace(true),
 183   _liveness(               NULL)
 184 #if defined(COMPILER2)
 185   ,
 186   _flow(                   NULL),
 187   _bcea(                   NULL)
 188 #endif // COMPILER2
 189 {
 190   // Usually holder and accessor are the same type but in some cases
 191   // the holder has the wrong class loader (e.g. invokedynamic call
 192   // sites) so we pass the accessor.
 193   _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
 194 }
 195 
 196 
 197 // ------------------------------------------------------------------
 198 // ciMethod::load_code
 199 //
 200 // Load the bytecodes and exception handler table for this method.
 201 void ciMethod::load_code() {
 202   VM_ENTRY_MARK;
 203   assert(is_loaded(), "only loaded methods have code");
 204 
 205   Method* me = get_Method();
 206   Arena* arena = CURRENT_THREAD_ENV->arena();
 207 
 208   // Load the bytecodes.
 209   _code = (address)arena->Amalloc(code_size());
 210   memcpy(_code, me->code_base(), code_size());
 211 
 212 #if INCLUDE_JVMTI
 213   // Revert any breakpoint bytecodes in ci's copy
 214   if (me->number_of_breakpoints() > 0) {
 215     BreakpointInfo* bp = me->method_holder()->breakpoints();
 216     for (; bp != NULL; bp = bp->next()) {
 217       if (bp->match(me)) {
 218         code_at_put(bp->bci(), bp->orig_bytecode());
 219       }
 220     }
 221   }
 222 #endif
 223 
 224   // And load the exception table.
 225   ExceptionTable exc_table(me);
 226 
 227   // Allocate one extra spot in our list of exceptions.  This
 228   // last entry will be used to represent the possibility that
 229   // an exception escapes the method.  See ciExceptionHandlerStream
 230   // for details.
 231   _exception_handlers =
 232     (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
 233                                          * (_handler_count + 1));
 234   if (_handler_count > 0) {
 235     for (int i=0; i<_handler_count; i++) {
 236       _exception_handlers[i] = new (arena) ciExceptionHandler(
 237                                 holder(),
 238             /* start    */      exc_table.start_pc(i),
 239             /* limit    */      exc_table.end_pc(i),
 240             /* goto pc  */      exc_table.handler_pc(i),
 241             /* cp index */      exc_table.catch_type_index(i));
 242     }
 243   }
 244 
 245   // Put an entry at the end of our list to represent the possibility
 246   // of exceptional exit.
 247   _exception_handlers[_handler_count] =
 248     new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
 249 
 250   if (CIPrintMethodCodes) {
 251     print_codes();
 252   }
 253 }
 254 
 255 
 256 // ------------------------------------------------------------------
 257 // ciMethod::has_linenumber_table
 258 //
 259 // length unknown until decompression
 260 bool    ciMethod::has_linenumber_table() const {
 261   check_is_loaded();
 262   VM_ENTRY_MARK;
 263   return get_Method()->has_linenumber_table();
 264 }
 265 
 266 
 267 // ------------------------------------------------------------------
 268 // ciMethod::line_number_from_bci
 269 int ciMethod::line_number_from_bci(int bci) const {
 270   check_is_loaded();
 271   VM_ENTRY_MARK;
 272   return get_Method()->line_number_from_bci(bci);
 273 }
 274 
 275 
 276 // ------------------------------------------------------------------
 277 // ciMethod::vtable_index
 278 //
 279 // Get the position of this method's entry in the vtable, if any.
 280 int ciMethod::vtable_index() {
 281   check_is_loaded();
 282   assert(holder()->is_linked(), "must be linked");
 283   VM_ENTRY_MARK;
 284   return get_Method()->vtable_index();
 285 }
 286 
 287 // ------------------------------------------------------------------
 288 // ciMethod::uses_balanced_monitors
 289 //
 290 // Does this method use monitors in a strict stack-disciplined manner?
 291 bool ciMethod::has_balanced_monitors() {
 292   check_is_loaded();
 293   if (_balanced_monitors) return true;
 294 
 295   // Analyze the method to see if monitors are used properly.
 296   VM_ENTRY_MARK;
 297   methodHandle method(THREAD, get_Method());
 298   assert(method->has_monitor_bytecodes(), "should have checked this");
 299 
 300   // Check to see if a previous compilation computed the
 301   // monitor-matching analysis.
 302   if (method->guaranteed_monitor_matching()) {
 303     _balanced_monitors = true;
 304     return true;
 305   }
 306 
 307   {
 308     ExceptionMark em(THREAD);
 309     ResourceMark rm(THREAD);
 310     GeneratePairingInfo gpi(method);
 311     if (!gpi.compute_map(THREAD)) {
 312       fatal("Unrecoverable verification or out-of-memory error");
 313     }
 314     if (!gpi.monitor_safe()) {
 315       return false;
 316     }
 317     method->set_guaranteed_monitor_matching();
 318     _balanced_monitors = true;
 319   }
 320   return true;
 321 }
 322 
 323 
 324 // ------------------------------------------------------------------
 325 // ciMethod::get_flow_analysis
 326 ciTypeFlow* ciMethod::get_flow_analysis() {
 327 #if defined(COMPILER2)
 328   if (_flow == NULL) {
 329     ciEnv* env = CURRENT_ENV;
 330     _flow = new (env->arena()) ciTypeFlow(env, this);
 331     _flow->do_flow();
 332   }
 333   return _flow;
 334 #else // COMPILER2
 335   ShouldNotReachHere();
 336   return NULL;
 337 #endif // COMPILER2
 338 }
 339 
 340 
 341 // ------------------------------------------------------------------
 342 // ciMethod::get_osr_flow_analysis
 343 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
 344 #if defined(COMPILER2)
 345   // OSR entry points are always place after a call bytecode of some sort
 346   assert(osr_bci >= 0, "must supply valid OSR entry point");
 347   ciEnv* env = CURRENT_ENV;
 348   ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
 349   flow->do_flow();
 350   return flow;
 351 #else // COMPILER2
 352   ShouldNotReachHere();
 353   return NULL;
 354 #endif // COMPILER2
 355 }
 356 
 357 // ------------------------------------------------------------------
 358 // ciMethod::raw_liveness_at_bci
 359 //
 360 // Which local variables are live at a specific bci?
 361 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
 362   check_is_loaded();
 363   if (_liveness == NULL) {
 364     // Create the liveness analyzer.
 365     Arena* arena = CURRENT_ENV->arena();
 366     _liveness = new (arena) MethodLiveness(arena, this);
 367     _liveness->compute_liveness();
 368   }
 369   return _liveness->get_liveness_at(bci);
 370 }
 371 
 372 // ------------------------------------------------------------------
 373 // ciMethod::liveness_at_bci
 374 //
 375 // Which local variables are live at a specific bci?  When debugging
 376 // will return true for all locals in some cases to improve debug
 377 // information.
 378 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
 379   if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
 380     // Keep all locals live for the user's edification and amusement.
 381     MethodLivenessResult result(_max_locals);
 382     result.set_range(0, _max_locals);
 383     result.set_is_valid();
 384     return result;
 385   }
 386   return raw_liveness_at_bci(bci);
 387 }
 388 
 389 // ciMethod::live_local_oops_at_bci
 390 //
 391 // find all the live oops in the locals array for a particular bci
 392 // Compute what the interpreter believes by using the interpreter
 393 // oopmap generator. This is used as a double check during osr to
 394 // guard against conservative result from MethodLiveness making us
 395 // think a dead oop is live.  MethodLiveness is conservative in the
 396 // sense that it may consider locals to be live which cannot be live,
 397 // like in the case where a local could contain an oop or  a primitive
 398 // along different paths.  In that case the local must be dead when
 399 // those paths merge. Since the interpreter's viewpoint is used when
 400 // gc'ing an interpreter frame we need to use its viewpoint  during
 401 // OSR when loading the locals.
 402 
 403 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
 404   VM_ENTRY_MARK;
 405   InterpreterOopMap mask;
 406   OopMapCache::compute_one_oop_map(methodHandle(THREAD, get_Method()), bci, &mask);
 407   int mask_size = max_locals();
 408   ResourceBitMap result(mask_size);
 409   int i;
 410   for (i = 0; i < mask_size ; i++ ) {
 411     if (mask.is_oop(i)) result.set_bit(i);
 412   }
 413   return result;
 414 }
 415 
 416 
 417 #ifdef COMPILER1
 418 // ------------------------------------------------------------------
 419 // ciMethod::bci_block_start
 420 //
 421 // Marks all bcis where a new basic block starts
 422 const BitMap& ciMethod::bci_block_start() {
 423   check_is_loaded();
 424   if (_liveness == NULL) {
 425     // Create the liveness analyzer.
 426     Arena* arena = CURRENT_ENV->arena();
 427     _liveness = new (arena) MethodLiveness(arena, this);
 428     _liveness->compute_liveness();
 429   }
 430 
 431   return _liveness->get_bci_block_start();
 432 }
 433 #endif // COMPILER1
 434 
 435 
 436 // ------------------------------------------------------------------
 437 // ciMethod::check_overflow
 438 //
 439 // Check whether the profile counter is overflowed and adjust if true.
 440 // For invoke* it will turn negative values into max_jint,
 441 // and for checkcast/aastore/instanceof turn positive values into min_jint.
 442 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
 443   switch (code) {
 444     case Bytecodes::_aastore:    // fall-through
 445     case Bytecodes::_checkcast:  // fall-through
 446     case Bytecodes::_instanceof: {
 447       return (c > 0 ? min_jint : c); // always non-positive
 448     }
 449     default: {
 450       assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
 451       return (c < 0 ? max_jint : c); // always non-negative
 452     }
 453   }
 454 }
 455 
 456 
 457 // ------------------------------------------------------------------
 458 // ciMethod::call_profile_at_bci
 459 //
 460 // Get the ciCallProfile for the invocation of this method.
 461 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
 462 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
 463   ResourceMark rm;
 464   ciCallProfile result;
 465   if (method_data() != NULL && method_data()->is_mature()) {
 466     ciProfileData* data = method_data()->bci_to_data(bci);
 467     if (data != NULL && data->is_CounterData()) {
 468       // Every profiled call site has a counter.
 469       int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
 470 
 471       if (!data->is_ReceiverTypeData()) {
 472         result._receiver_count[0] = 0;  // that's a definite zero
 473       } else { // ReceiverTypeData is a subclass of CounterData
 474         ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
 475         // In addition, virtual call sites have receiver type information
 476         int receivers_count_total = 0;
 477         int morphism = 0;
 478         // Precompute morphism for the possible fixup
 479         for (uint i = 0; i < call->row_limit(); i++) {
 480           ciKlass* receiver = call->receiver(i);
 481           if (receiver == NULL)  continue;
 482           morphism++;
 483         }
 484         int epsilon = 0;
 485         // For a call, it is assumed that either the type of the receiver(s)
 486         // is recorded or an associated counter is incremented, but not both. With
 487         // tiered compilation, however, both can happen due to the interpreter and
 488         // C1 profiling invocations differently. Address that inconsistency here.
 489         if (morphism == 1 && count > 0) {
 490           epsilon = count;
 491           count = 0;
 492         }
 493         for (uint i = 0; i < call->row_limit(); i++) {
 494           ciKlass* receiver = call->receiver(i);
 495           if (receiver == NULL)  continue;
 496           int rcount = saturated_add(call->receiver_count(i), epsilon);
 497           if (rcount == 0) rcount = 1; // Should be valid value
 498           receivers_count_total = saturated_add(receivers_count_total, rcount);
 499           // Add the receiver to result data.
 500           result.add_receiver(receiver, rcount);
 501           // If we extend profiling to record methods,
 502           // we will set result._method also.
 503         }
 504         // Determine call site's morphism.
 505         // The call site count is 0 with known morphism (only 1 or 2 receivers)
 506         // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
 507         // The call site count is > 0 in the case of a polymorphic virtual call.
 508         if (morphism > 0 && morphism == result._limit) {
 509            // The morphism <= MorphismLimit.
 510            if ((morphism <  ciCallProfile::MorphismLimit) ||
 511                (morphism == ciCallProfile::MorphismLimit && count == 0)) {
 512 #ifdef ASSERT
 513              if (count > 0) {
 514                this->print_short_name(tty);
 515                tty->print_cr(" @ bci:%d", bci);
 516                this->print_codes();
 517                assert(false, "this call site should not be polymorphic");
 518              }
 519 #endif
 520              result._morphism = morphism;
 521            }
 522         }
 523         // Make the count consistent if this is a call profile. If count is
 524         // zero or less, presume that this is a typecheck profile and
 525         // do nothing.  Otherwise, increase count to be the sum of all
 526         // receiver's counts.
 527         if (count >= 0) {
 528           count = saturated_add(count, receivers_count_total);
 529         }
 530       }
 531       result._count = count;
 532     }
 533   }
 534   return result;
 535 }
 536 
 537 // ------------------------------------------------------------------
 538 // Add new receiver and sort data by receiver's profile count.
 539 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
 540   // Add new receiver and sort data by receiver's counts when we have space
 541   // for it otherwise replace the less called receiver (less called receiver
 542   // is placed to the last array element which is not used).
 543   // First array's element contains most called receiver.
 544   int i = _limit;
 545   for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
 546     _receiver[i] = _receiver[i-1];
 547     _receiver_count[i] = _receiver_count[i-1];
 548   }
 549   _receiver[i] = receiver;
 550   _receiver_count[i] = receiver_count;
 551   if (_limit < MorphismLimit) _limit++;
 552 }
 553 
 554 
 555 void ciMethod::assert_virtual_call_type_ok(int bci) {
 556   assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
 557          java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 558 }
 559 
 560 void ciMethod::assert_call_type_ok(int bci) {
 561   assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
 562          java_code_at_bci(bci) == Bytecodes::_invokespecial ||
 563          java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 564 }
 565 
 566 /**
 567  * Check whether profiling provides a type for the argument i to the
 568  * call at bci bci
 569  *
 570  * @param [in]bci         bci of the call
 571  * @param [in]i           argument number
 572  * @param [out]type       profiled type of argument, NULL if none
 573  * @param [out]ptr_kind   whether always null, never null or maybe null
 574  * @return                true if profiling exists
 575  *
 576  */
 577 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 578   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 579     ciProfileData* data = method_data()->bci_to_data(bci);
 580     if (data != NULL) {
 581       if (data->is_VirtualCallTypeData()) {
 582         assert_virtual_call_type_ok(bci);
 583         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 584         if (i >= call->number_of_arguments()) {
 585           return false;
 586         }
 587         type = call->valid_argument_type(i);
 588         ptr_kind = call->argument_ptr_kind(i);
 589         return true;
 590       } else if (data->is_CallTypeData()) {
 591         assert_call_type_ok(bci);
 592         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 593         if (i >= call->number_of_arguments()) {
 594           return false;
 595         }
 596         type = call->valid_argument_type(i);
 597         ptr_kind = call->argument_ptr_kind(i);
 598         return true;
 599       }
 600     }
 601   }
 602   return false;
 603 }
 604 
 605 /**
 606  * Check whether profiling provides a type for the return value from
 607  * the call at bci bci
 608  *
 609  * @param [in]bci         bci of the call
 610  * @param [out]type       profiled type of argument, NULL if none
 611  * @param [out]ptr_kind   whether always null, never null or maybe null
 612  * @return                true if profiling exists
 613  *
 614  */
 615 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 616   if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
 617     ciProfileData* data = method_data()->bci_to_data(bci);
 618     if (data != NULL) {
 619       if (data->is_VirtualCallTypeData()) {
 620         assert_virtual_call_type_ok(bci);
 621         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 622         if (call->has_return()) {
 623           type = call->valid_return_type();
 624           ptr_kind = call->return_ptr_kind();
 625           return true;
 626         }
 627       } else if (data->is_CallTypeData()) {
 628         assert_call_type_ok(bci);
 629         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 630         if (call->has_return()) {
 631           type = call->valid_return_type();
 632           ptr_kind = call->return_ptr_kind();
 633         }
 634         return true;
 635       }
 636     }
 637   }
 638   return false;
 639 }
 640 
 641 /**
 642  * Check whether profiling provides a type for the parameter i
 643  *
 644  * @param [in]i           parameter number
 645  * @param [out]type       profiled type of parameter, NULL if none
 646  * @param [out]ptr_kind   whether always null, never null or maybe null
 647  * @return                true if profiling exists
 648  *
 649  */
 650 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 651   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 652     ciParametersTypeData* parameters = method_data()->parameters_type_data();
 653     if (parameters != NULL && i < parameters->number_of_parameters()) {
 654       type = parameters->valid_parameter_type(i);
 655       ptr_kind = parameters->parameter_ptr_kind(i);
 656       return true;
 657     }
 658   }
 659   return false;
 660 }
 661 
 662 bool ciMethod::array_access_profiled_type(int bci, ciKlass*& array_type, ciKlass*& element_type, ProfilePtrKind& element_ptr, bool &flat_array, bool &null_free_array) {
 663   if (method_data() != NULL && method_data()->is_mature()) {
 664     ciProfileData* data = method_data()->bci_to_data(bci);
 665     if (data != NULL && data->is_ArrayLoadStoreData()) {
 666       ciArrayLoadStoreData* array_access = (ciArrayLoadStoreData*)data->as_ArrayLoadStoreData();
 667       array_type = array_access->array()->valid_type();
 668       element_type = array_access->element()->valid_type();
 669       element_ptr = array_access->element()->ptr_kind();
 670       flat_array = array_access->flat_array();
 671       null_free_array = array_access->null_free_array();
 672       return true;
 673     }
 674   }
 675   return false;
 676 }
 677 
 678 bool ciMethod::acmp_profiled_type(int bci, ciKlass*& left_type, ciKlass*& right_type, ProfilePtrKind& left_ptr, ProfilePtrKind& right_ptr, bool &left_inline_type, bool &right_inline_type) {
 679   if (method_data() != NULL && method_data()->is_mature()) {
 680     ciProfileData* data = method_data()->bci_to_data(bci);
 681     if (data != NULL && data->is_ACmpData()) {
 682       ciACmpData* acmp = (ciACmpData*)data->as_ACmpData();
 683       left_type = acmp->left()->valid_type();
 684       right_type = acmp->right()->valid_type();
 685       left_ptr = acmp->left()->ptr_kind();
 686       right_ptr = acmp->right()->ptr_kind();
 687       left_inline_type = acmp->left_inline_type();
 688       right_inline_type = acmp->right_inline_type();
 689       return true;
 690     }
 691   }
 692   return false;
 693 }
 694 
 695 
 696 // ------------------------------------------------------------------
 697 // ciMethod::find_monomorphic_target
 698 //
 699 // Given a certain calling environment, find the monomorphic target
 700 // for the call.  Return NULL if the call is not monomorphic in
 701 // its calling environment, or if there are only abstract methods.
 702 // The returned method is never abstract.
 703 // Note: If caller uses a non-null result, it must inform dependencies
 704 // via assert_unique_concrete_method or assert_leaf_type.
 705 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
 706                                             ciInstanceKlass* callee_holder,
 707                                             ciInstanceKlass* actual_recv,
 708                                             bool check_access) {
 709   check_is_loaded();
 710 
 711   if (actual_recv->is_interface()) {
 712     // %%% We cannot trust interface types, yet.  See bug 6312651.
 713     return NULL;
 714   }
 715 
 716   ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access, true /* allow_abstract */);
 717   if (root_m == NULL) {
 718     // Something went wrong looking up the actual receiver method.
 719     return NULL;
 720   }
 721 
 722   // Make certain quick checks even if UseCHA is false.
 723 
 724   // Is it private or final?
 725   if (root_m->can_be_statically_bound()) {
 726     assert(!root_m->is_abstract(), "sanity");
 727     return root_m;
 728   }
 729 
 730   if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
 731     // Easy case.  There is no other place to put a method, so don't bother
 732     // to go through the VM_ENTRY_MARK and all the rest.
 733     if (root_m->is_abstract()) {
 734       return NULL;
 735     }
 736     return root_m;
 737   }
 738 
 739   // Array methods (clone, hashCode, etc.) are always statically bound.
 740   // If we were to see an array type here, we'd return root_m.
 741   // However, this method processes only ciInstanceKlasses.  (See 4962591.)
 742   // The inline_native_clone intrinsic narrows Object to T[] properly,
 743   // so there is no need to do the same job here.
 744 
 745   if (!UseCHA)  return NULL;
 746 
 747   VM_ENTRY_MARK;
 748 
 749   methodHandle target;
 750   {
 751     MutexLocker locker(Compile_lock);
 752     InstanceKlass* context = actual_recv->get_instanceKlass();
 753     if (UseVtableBasedCHA) {
 754       target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context,
 755                                                                               root_m->get_Method(),
 756                                                                               callee_holder->get_Klass(),
 757                                                                               this->get_Method()));
 758     } else {
 759       if (root_m->is_abstract()) {
 760         return NULL; // not supported
 761       }
 762       target = methodHandle(THREAD, Dependencies::find_unique_concrete_method(context, root_m->get_Method()));
 763     }
 764     assert(target() == NULL || !target()->is_abstract(), "not allowed");
 765     // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
 766   }
 767 
 768 #ifndef PRODUCT
 769   if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
 770     tty->print("found a non-root unique target method");
 771     tty->print_cr("  context = %s", actual_recv->get_Klass()->external_name());
 772     tty->print("  method  = ");
 773     target->print_short_name(tty);
 774     tty->cr();
 775   }
 776 #endif //PRODUCT
 777 
 778   if (target() == NULL) {
 779     return NULL;
 780   }
 781   if (target() == root_m->get_Method()) {
 782     return root_m;
 783   }
 784   if (!root_m->is_public() &&
 785       !root_m->is_protected()) {
 786     // If we are going to reason about inheritance, it's easiest
 787     // if the method in question is public, protected, or private.
 788     // If the answer is not root_m, it is conservatively correct
 789     // to return NULL, even if the CHA encountered irrelevant
 790     // methods in other packages.
 791     // %%% TO DO: Work out logic for package-private methods
 792     // with the same name but different vtable indexes.
 793     return NULL;
 794   }
 795   return CURRENT_THREAD_ENV->get_method(target());
 796 }
 797 
 798 // ------------------------------------------------------------------
 799 // ciMethod::can_be_statically_bound
 800 //
 801 // Tries to determine whether a method can be statically bound in some context.
 802 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
 803   return (holder() == context) && can_be_statically_bound();
 804 }
 805 
 806 // ------------------------------------------------------------------
 807 // ciMethod::can_omit_stack_trace
 808 //
 809 // Tries to determine whether a method can omit stack trace in throw in compiled code.
 810 bool ciMethod::can_omit_stack_trace() const {
 811   if (!StackTraceInThrowable) {
 812     return true; // stack trace is switched off.
 813   }
 814   if (!OmitStackTraceInFastThrow) {
 815     return false; // Have to provide stack trace.
 816   }
 817   return _can_omit_stack_trace;
 818 }
 819 
 820 // ------------------------------------------------------------------
 821 // ciMethod::resolve_invoke
 822 //
 823 // Given a known receiver klass, find the target for the call.
 824 // Return NULL if the call has no target or the target is abstract.
 825 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access, bool allow_abstract) {
 826   check_is_loaded();
 827   VM_ENTRY_MARK;
 828 
 829   Klass* caller_klass = caller->get_Klass();
 830   Klass* recv         = exact_receiver->get_Klass();
 831   Klass* resolved     = holder()->get_Klass();
 832   Symbol* h_name      = name()->get_symbol();
 833   Symbol* h_signature = signature()->get_symbol();
 834 
 835   LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
 836                      check_access ? LinkInfo::AccessCheck::required : LinkInfo::AccessCheck::skip,
 837                      check_access ? LinkInfo::LoaderConstraintCheck::required : LinkInfo::LoaderConstraintCheck::skip);
 838   Method* m = NULL;
 839   // Only do exact lookup if receiver klass has been linked.  Otherwise,
 840   // the vtable has not been setup, and the LinkResolver will fail.
 841   if (recv->is_array_klass()
 842        ||
 843       (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
 844     if (holder()->is_interface()) {
 845       m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
 846     } else {
 847       m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
 848     }
 849   }
 850 
 851   if (m == NULL) {
 852     // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
 853     return NULL;
 854   }
 855 
 856   ciMethod* result = this;
 857   if (m != get_Method()) {
 858     result = CURRENT_THREAD_ENV->get_method(m);
 859   }
 860 
 861   if (result->is_abstract() && !allow_abstract) {
 862     // Don't return abstract methods because they aren't optimizable or interesting.
 863     return NULL;
 864   }
 865   return result;
 866 }
 867 
 868 // ------------------------------------------------------------------
 869 // ciMethod::resolve_vtable_index
 870 //
 871 // Given a known receiver klass, find the vtable index for the call.
 872 // Return Method::invalid_vtable_index if the vtable_index is unknown.
 873 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
 874    check_is_loaded();
 875 
 876    int vtable_index = Method::invalid_vtable_index;
 877    // Only do lookup if receiver klass has been linked.  Otherwise,
 878    // the vtable has not been setup, and the LinkResolver will fail.
 879    if (!receiver->is_interface()
 880        && (!receiver->is_instance_klass() ||
 881            receiver->as_instance_klass()->is_linked())) {
 882      VM_ENTRY_MARK;
 883 
 884      Klass* caller_klass = caller->get_Klass();
 885      Klass* recv         = receiver->get_Klass();
 886      Symbol* h_name = name()->get_symbol();
 887      Symbol* h_signature = signature()->get_symbol();
 888 
 889      LinkInfo link_info(recv, h_name, h_signature, caller_klass);
 890      vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
 891      if (vtable_index == Method::nonvirtual_vtable_index) {
 892        // A statically bound method.  Return "no such index".
 893        vtable_index = Method::invalid_vtable_index;
 894      }
 895    }
 896 
 897    return vtable_index;
 898 }
 899 
 900 // ------------------------------------------------------------------
 901 // ciMethod::get_field_at_bci
 902 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
 903   ciBytecodeStream iter(this);
 904   iter.reset_to_bci(bci);
 905   iter.next();
 906   return iter.get_field(will_link);
 907 }
 908 
 909 // ------------------------------------------------------------------
 910 // ciMethod::get_method_at_bci
 911 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
 912   ciBytecodeStream iter(this);
 913   iter.reset_to_bci(bci);
 914   iter.next();
 915   return iter.get_method(will_link, declared_signature);
 916 }
 917 
 918 // ------------------------------------------------------------------
 919 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
 920   ciBytecodeStream iter(this);
 921   iter.reset_to_bci(bci);
 922   iter.next();
 923   return iter.get_declared_method_holder();
 924 }
 925 
 926 // ------------------------------------------------------------------
 927 // Adjust a CounterData count to be commensurate with
 928 // interpreter_invocation_count.  If the MDO exists for
 929 // only 25% of the time the method exists, then the
 930 // counts in the MDO should be scaled by 4X, so that
 931 // they can be usefully and stably compared against the
 932 // invocation counts in methods.
 933 int ciMethod::scale_count(int count, float prof_factor) {
 934   if (count > 0 && method_data() != NULL) {
 935     int counter_life = method_data()->invocation_count();
 936     int method_life = interpreter_invocation_count();
 937     if (method_life < counter_life) { // may happen because of the snapshot timing
 938       method_life = counter_life;
 939     }
 940     if (counter_life > 0) {
 941       count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
 942       count = (count > 0) ? count : 1;
 943     } else {
 944       count = 1;
 945     }
 946   }
 947   return count;
 948 }
 949 
 950 
 951 // ------------------------------------------------------------------
 952 // ciMethod::is_special_get_caller_class_method
 953 //
 954 bool ciMethod::is_ignored_by_security_stack_walk() const {
 955   check_is_loaded();
 956   VM_ENTRY_MARK;
 957   return get_Method()->is_ignored_by_security_stack_walk();
 958 }
 959 
 960 // ------------------------------------------------------------------
 961 // ciMethod::needs_clinit_barrier
 962 //
 963 bool ciMethod::needs_clinit_barrier() const {
 964   check_is_loaded();
 965   return is_static() && !holder()->is_initialized();
 966 }
 967 
 968 // ------------------------------------------------------------------
 969 // invokedynamic support
 970 
 971 // ------------------------------------------------------------------
 972 // ciMethod::is_method_handle_intrinsic
 973 //
 974 // Return true if the method is an instance of the JVM-generated
 975 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
 976 bool ciMethod::is_method_handle_intrinsic() const {
 977   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 978   return (MethodHandles::is_signature_polymorphic(iid) &&
 979           MethodHandles::is_signature_polymorphic_intrinsic(iid));
 980 }
 981 
 982 // ------------------------------------------------------------------
 983 // ciMethod::is_compiled_lambda_form
 984 //
 985 // Return true if the method is a generated MethodHandle adapter.
 986 // These are built by Java code.
 987 bool ciMethod::is_compiled_lambda_form() const {
 988   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 989   return iid == vmIntrinsics::_compiledLambdaForm;
 990 }
 991 
 992 // ------------------------------------------------------------------
 993 // ciMethod::is_object_constructor
 994 //
 995 bool ciMethod::is_object_constructor() const {
 996    return (name() == ciSymbols::object_initializer_name()
 997            && signature()->return_type()->is_void());
 998    // Note:  We can't test is_static, because that would
 999    // require the method to be loaded.  Sometimes it isn't.
1000 }
1001 
1002 // ------------------------------------------------------------------
1003 // ciMethod::is_static_init_factory
1004 //
1005 bool ciMethod::is_static_init_factory() const {
1006    return (name() == ciSymbols::object_initializer_name()
1007            && !signature()->return_type()->is_void());
1008    // Note:  We can't test is_static, because that would
1009    // require the method to be loaded.  Sometimes it isn't.
1010 }
1011 
1012 // ------------------------------------------------------------------
1013 // ciMethod::has_member_arg
1014 //
1015 // Return true if the method is a linker intrinsic like _linkToVirtual.
1016 // These are built by the JVM.
1017 bool ciMethod::has_member_arg() const {
1018   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
1019   return (MethodHandles::is_signature_polymorphic(iid) &&
1020           MethodHandles::has_member_arg(iid));
1021 }
1022 
1023 // ------------------------------------------------------------------
1024 // ciMethod::ensure_method_data
1025 //
1026 // Generate new MethodData* objects at compile time.
1027 // Return true if allocation was successful or no MDO is required.
1028 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
1029   EXCEPTION_CONTEXT;
1030   if (is_native() || is_abstract() || h_m()->is_accessor()) {
1031     return true;
1032   }
1033   if (h_m()->method_data() == NULL) {
1034     Method::build_interpreter_method_data(h_m, THREAD);
1035     if (HAS_PENDING_EXCEPTION) {
1036       CLEAR_PENDING_EXCEPTION;
1037     }
1038   }
1039   if (h_m()->method_data() != NULL) {
1040     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1041     return _method_data->load_data();
1042   } else {
1043     _method_data = CURRENT_ENV->get_empty_methodData();
1044     return false;
1045   }
1046 }
1047 
1048 // public, retroactive version
1049 bool ciMethod::ensure_method_data() {
1050   bool result = true;
1051   if (_method_data == NULL || _method_data->is_empty()) {
1052     GUARDED_VM_ENTRY({
1053       methodHandle mh(Thread::current(), get_Method());
1054       result = ensure_method_data(mh);
1055     });
1056   }
1057   return result;
1058 }
1059 
1060 
1061 // ------------------------------------------------------------------
1062 // ciMethod::method_data
1063 //
1064 ciMethodData* ciMethod::method_data() {
1065   if (_method_data != NULL) {
1066     return _method_data;
1067   }
1068   VM_ENTRY_MARK;
1069   ciEnv* env = CURRENT_ENV;
1070   Thread* my_thread = JavaThread::current();
1071   methodHandle h_m(my_thread, get_Method());
1072 
1073   if (h_m()->method_data() != NULL) {
1074     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1075     _method_data->load_data();
1076   } else {
1077     _method_data = CURRENT_ENV->get_empty_methodData();
1078   }
1079   return _method_data;
1080 
1081 }
1082 
1083 // ------------------------------------------------------------------
1084 // ciMethod::method_data_or_null
1085 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1086 // NULL otherwise.
1087 ciMethodData* ciMethod::method_data_or_null() {
1088   ciMethodData *md = method_data();
1089   if (md->is_empty()) {
1090     return NULL;
1091   }
1092   return md;
1093 }
1094 
1095 // ------------------------------------------------------------------
1096 // ciMethod::ensure_method_counters
1097 //
1098 MethodCounters* ciMethod::ensure_method_counters() {
1099   check_is_loaded();
1100   VM_ENTRY_MARK;
1101   methodHandle mh(THREAD, get_Method());
1102   MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1103   return method_counters;
1104 }
1105 
1106 // ------------------------------------------------------------------
1107 // ciMethod::has_option
1108 //
1109 bool ciMethod::has_option(enum CompileCommand option) {
1110   check_is_loaded();
1111   VM_ENTRY_MARK;
1112   methodHandle mh(THREAD, get_Method());
1113   return CompilerOracle::has_option(mh, option);
1114 }
1115 
1116 // ------------------------------------------------------------------
1117 // ciMethod::has_option_value
1118 //
1119 bool ciMethod::has_option_value(enum CompileCommand option, double& value) {
1120   check_is_loaded();
1121   VM_ENTRY_MARK;
1122   methodHandle mh(THREAD, get_Method());
1123   return CompilerOracle::has_option_value(mh, option, value);
1124 }
1125 // ------------------------------------------------------------------
1126 // ciMethod::can_be_compiled
1127 //
1128 // Have previous compilations of this method succeeded?
1129 bool ciMethod::can_be_compiled() {
1130   check_is_loaded();
1131   ciEnv* env = CURRENT_ENV;
1132   if (is_c1_compile(env->comp_level())) {
1133     return _is_c1_compilable;
1134   }
1135   return _is_c2_compilable;
1136 }
1137 
1138 // ------------------------------------------------------------------
1139 // ciMethod::has_compiled_code
1140 bool ciMethod::has_compiled_code() {
1141   return instructions_size() > 0;
1142 }
1143 
1144 int ciMethod::highest_osr_comp_level() {
1145   check_is_loaded();
1146   VM_ENTRY_MARK;
1147   return get_Method()->highest_osr_comp_level();
1148 }
1149 
1150 // ------------------------------------------------------------------
1151 // ciMethod::code_size_for_inlining
1152 //
1153 // Code size for inlining decisions.  This method returns a code
1154 // size of 1 for methods which has the ForceInline annotation.
1155 int ciMethod::code_size_for_inlining() {
1156   check_is_loaded();
1157   if (get_Method()->force_inline()) {
1158     return 1;
1159   }
1160   return code_size();
1161 }
1162 
1163 // ------------------------------------------------------------------
1164 // ciMethod::instructions_size
1165 //
1166 // This is a rough metric for "fat" methods, compared before inlining
1167 // with InlineSmallCode.  The CodeBlob::code_size accessor includes
1168 // junk like exception handler, stubs, and constant table, which are
1169 // not highly relevant to an inlined method.  So we use the more
1170 // specific accessor nmethod::insts_size.
1171 int ciMethod::instructions_size() {
1172   if (_instructions_size == -1) {
1173     GUARDED_VM_ENTRY(
1174                      CompiledMethod* code = get_Method()->code();
1175                      if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1176                        _instructions_size = code->insts_end() - code->verified_entry_point();
1177                      } else {
1178                        _instructions_size = 0;
1179                      }
1180                      );
1181   }
1182   return _instructions_size;
1183 }
1184 
1185 // ------------------------------------------------------------------
1186 // ciMethod::log_nmethod_identity
1187 void ciMethod::log_nmethod_identity(xmlStream* log) {
1188   GUARDED_VM_ENTRY(
1189     CompiledMethod* code = get_Method()->code();
1190     if (code != NULL) {
1191       code->log_identity(log);
1192     }
1193   )
1194 }
1195 
1196 // ------------------------------------------------------------------
1197 // ciMethod::is_not_reached
1198 bool ciMethod::is_not_reached(int bci) {
1199   check_is_loaded();
1200   VM_ENTRY_MARK;
1201   return Interpreter::is_not_reached(
1202                methodHandle(THREAD, get_Method()), bci);
1203 }
1204 
1205 // ------------------------------------------------------------------
1206 // ciMethod::was_never_executed
1207 bool ciMethod::was_executed_more_than(int times) {
1208   VM_ENTRY_MARK;
1209   return get_Method()->was_executed_more_than(times);
1210 }
1211 
1212 // ------------------------------------------------------------------
1213 // ciMethod::has_unloaded_classes_in_signature
1214 bool ciMethod::has_unloaded_classes_in_signature() {
1215   VM_ENTRY_MARK;
1216   {
1217     ExceptionMark em(THREAD);
1218     methodHandle m(THREAD, get_Method());
1219     bool has_unloaded = Method::has_unloaded_classes_in_signature(m, thread);
1220     if( HAS_PENDING_EXCEPTION ) {
1221       CLEAR_PENDING_EXCEPTION;
1222       return true;     // Declare that we may have unloaded classes
1223     }
1224     return has_unloaded;
1225   }
1226 }
1227 
1228 // ------------------------------------------------------------------
1229 // ciMethod::is_klass_loaded
1230 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1231   VM_ENTRY_MARK;
1232   return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1233 }
1234 
1235 // ------------------------------------------------------------------
1236 // ciMethod::check_call
1237 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1238   // This method is used only in C2 from InlineTree::ok_to_inline,
1239   // and is only used under -Xcomp.
1240   // It appears to fail when applied to an invokeinterface call site.
1241   // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1242   VM_ENTRY_MARK;
1243   {
1244     ExceptionMark em(THREAD);
1245     HandleMark hm(THREAD);
1246     constantPoolHandle pool (THREAD, get_Method()->constants());
1247     Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1248     Method* spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1249     if (HAS_PENDING_EXCEPTION) {
1250       CLEAR_PENDING_EXCEPTION;
1251       return false;
1252     } else {
1253       return (spec_method->is_static() == is_static);
1254     }
1255   }
1256   return false;
1257 }
1258 
1259 // ------------------------------------------------------------------
1260 // ciMethod::profile_aging
1261 //
1262 // Should the method be compiled with an age counter?
1263 bool ciMethod::profile_aging() const {
1264   return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1265                           !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1266 }
1267 // ------------------------------------------------------------------
1268 // ciMethod::print_codes
1269 //
1270 // Print the bytecodes for this method.
1271 void ciMethod::print_codes_on(outputStream* st) {
1272   check_is_loaded();
1273   GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1274 }
1275 
1276 
1277 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1278   check_is_loaded(); \
1279   VM_ENTRY_MARK; \
1280   return get_Method()->flag_accessor(); \
1281 }
1282 
1283 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }
1284 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }
1285 bool ciMethod::is_getter      () const {         FETCH_FLAG_FROM_VM(is_getter); }
1286 bool ciMethod::is_setter      () const {         FETCH_FLAG_FROM_VM(is_setter); }
1287 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }
1288 bool ciMethod::is_object_constructor_or_class_initializer() const { FETCH_FLAG_FROM_VM(is_object_constructor_or_class_initializer); }
1289 bool ciMethod::is_empty       () const {         FETCH_FLAG_FROM_VM(is_empty_method); }
1290 
1291 bool ciMethod::is_boxing_method() const {
1292   if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1293     switch (intrinsic_id()) {
1294       case vmIntrinsics::_Boolean_valueOf:
1295       case vmIntrinsics::_Byte_valueOf:
1296       case vmIntrinsics::_Character_valueOf:
1297       case vmIntrinsics::_Short_valueOf:
1298       case vmIntrinsics::_Integer_valueOf:
1299       case vmIntrinsics::_Long_valueOf:
1300       case vmIntrinsics::_Float_valueOf:
1301       case vmIntrinsics::_Double_valueOf:
1302         return true;
1303       default:
1304         return false;
1305     }
1306   }
1307   return false;
1308 }
1309 
1310 bool ciMethod::is_unboxing_method() const {
1311   if (intrinsic_id() != vmIntrinsics::_none && holder()->is_box_klass()) {
1312     switch (intrinsic_id()) {
1313       case vmIntrinsics::_booleanValue:
1314       case vmIntrinsics::_byteValue:
1315       case vmIntrinsics::_charValue:
1316       case vmIntrinsics::_shortValue:
1317       case vmIntrinsics::_intValue:
1318       case vmIntrinsics::_longValue:
1319       case vmIntrinsics::_floatValue:
1320       case vmIntrinsics::_doubleValue:
1321         return true;
1322       default:
1323         return false;
1324     }
1325   }
1326   return false;
1327 }
1328 
1329 bool ciMethod::is_vector_method() const {
1330   return (holder() == ciEnv::current()->vector_VectorSupport_klass()) &&
1331          (intrinsic_id() != vmIntrinsics::_none);
1332 }
1333 
1334 BCEscapeAnalyzer  *ciMethod::get_bcea() {
1335 #ifdef COMPILER2
1336   if (_bcea == NULL) {
1337     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1338   }
1339   return _bcea;
1340 #else // COMPILER2
1341   ShouldNotReachHere();
1342   return NULL;
1343 #endif // COMPILER2
1344 }
1345 
1346 ciMethodBlocks  *ciMethod::get_method_blocks() {
1347   if (_method_blocks == NULL) {
1348     Arena *arena = CURRENT_ENV->arena();
1349     _method_blocks = new (arena) ciMethodBlocks(arena, this);
1350   }
1351   return _method_blocks;
1352 }
1353 
1354 #undef FETCH_FLAG_FROM_VM
1355 
1356 void ciMethod::dump_name_as_ascii(outputStream* st, Method* method) {
1357   st->print("%s %s %s",
1358             CURRENT_ENV->replay_name(method->method_holder()),
1359             method->name()->as_quoted_ascii(),
1360             method->signature()->as_quoted_ascii());
1361 }
1362 
1363 void ciMethod::dump_name_as_ascii(outputStream* st) {
1364   Method* method = get_Method();
1365   dump_name_as_ascii(st, method);
1366 }
1367 
1368 void ciMethod::dump_replay_data(outputStream* st) {
1369   ResourceMark rm;
1370   Method* method = get_Method();
1371   if (MethodHandles::is_signature_polymorphic_method(method)) {
1372     // ignore for now
1373     return;
1374   }
1375   MethodCounters* mcs = method->method_counters();
1376   st->print("ciMethod ");
1377   dump_name_as_ascii(st);
1378   st->print_cr(" %d %d %d %d %d",
1379                mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1380                mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1381                interpreter_invocation_count(),
1382                interpreter_throwout_count(),
1383                _instructions_size);
1384 }
1385 
1386 // ------------------------------------------------------------------
1387 // ciMethod::print_codes
1388 //
1389 // Print a range of the bytecodes for this method.
1390 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1391   check_is_loaded();
1392   GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1393 }
1394 
1395 // ------------------------------------------------------------------
1396 // ciMethod::print_name
1397 //
1398 // Print the name of this method, including signature and some flags.
1399 void ciMethod::print_name(outputStream* st) {
1400   check_is_loaded();
1401   GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1402 }
1403 
1404 // ------------------------------------------------------------------
1405 // ciMethod::print_short_name
1406 //
1407 // Print the name of this method, without signature.
1408 void ciMethod::print_short_name(outputStream* st) {
1409   if (is_loaded()) {
1410     GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1411   } else {
1412     // Fall back if method is not loaded.
1413     holder()->print_name_on(st);
1414     st->print("::");
1415     name()->print_symbol_on(st);
1416     if (WizardMode)
1417       signature()->as_symbol()->print_symbol_on(st);
1418   }
1419 }
1420 
1421 // ------------------------------------------------------------------
1422 // ciMethod::print_impl
1423 //
1424 // Implementation of the print method.
1425 void ciMethod::print_impl(outputStream* st) {
1426   ciMetadata::print_impl(st);
1427   st->print(" name=");
1428   name()->print_symbol_on(st);
1429   st->print(" holder=");
1430   holder()->print_name_on(st);
1431   st->print(" signature=");
1432   signature()->as_symbol()->print_symbol_on(st);
1433   if (is_loaded()) {
1434     st->print(" loaded=true");
1435     st->print(" arg_size=%d", arg_size());
1436     st->print(" flags=");
1437     flags().print_member_flags(st);
1438   } else {
1439     st->print(" loaded=false");
1440   }
1441 }
1442 
1443 // ------------------------------------------------------------------
1444 
1445 static BasicType erase_to_word_type(BasicType bt) {
1446   if (is_subword_type(bt))   return T_INT;
1447   if (is_reference_type(bt)) return T_OBJECT;
1448   if (bt == T_PRIMITIVE_OBJECT)   return T_OBJECT;
1449   return bt;
1450 }
1451 
1452 static bool basic_types_match(ciType* t1, ciType* t2) {
1453   if (t1 == t2)  return true;
1454   return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1455 }
1456 
1457 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1458   bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1459                                   !resolved_method->is_method_handle_intrinsic();
1460 
1461   if (!invoke_through_mh_intrinsic) {
1462     // Method name & descriptor should stay the same.
1463     // Signatures may reference unloaded types and thus they may be not strictly equal.
1464     ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1465     ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1466 
1467     return (declared_method->name()->equals(resolved_method->name())) &&
1468            (declared_signature->equals(resolved_signature));
1469   }
1470 
1471   ciMethod* linker = declared_method;
1472   ciMethod* target = resolved_method;
1473   // Linkers have appendix argument which is not passed to callee.
1474   int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1475   if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1476     return false; // argument slot count mismatch
1477   }
1478 
1479   ciSignature* linker_sig = linker->signature();
1480   ciSignature* target_sig = target->signature();
1481 
1482   if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1483       target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1484     return false; // argument count mismatch
1485   }
1486 
1487   int sbase = 0, rbase = 0;
1488   switch (linker->intrinsic_id()) {
1489     case vmIntrinsics::_linkToVirtual:
1490     case vmIntrinsics::_linkToInterface:
1491     case vmIntrinsics::_linkToSpecial: {
1492       if (target->is_static()) {
1493         return false;
1494       }
1495       if (linker_sig->type_at(0)->is_primitive_type()) {
1496         return false;  // receiver should be an oop
1497       }
1498       sbase = 1; // skip receiver
1499       break;
1500     }
1501     case vmIntrinsics::_linkToStatic: {
1502       if (!target->is_static()) {
1503         return false;
1504       }
1505       break;
1506     }
1507     case vmIntrinsics::_invokeBasic: {
1508       if (target->is_static()) {
1509         if (target_sig->type_at(0)->is_primitive_type()) {
1510           return false; // receiver should be an oop
1511         }
1512         rbase = 1; // skip receiver
1513       }
1514       break;
1515     }
1516     default:
1517       break;
1518   }
1519   assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1520   int arg_count = target_sig->count() - rbase;
1521   for (int i = 0; i < arg_count; i++) {
1522     if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1523       return false;
1524     }
1525   }
1526   // Only check the return type if the symbolic info has non-void return type.
1527   // I.e. the return value of the resolved method can be dropped.
1528   if (!linker->return_type()->is_void() &&
1529       !basic_types_match(linker->return_type(), target->return_type())) {
1530     return false;
1531   }
1532   return true; // no mismatch found
1533 }
1534 
1535 // ------------------------------------------------------------------
1536 
1537 bool ciMethod::is_scalarized_arg(int idx) const {
1538   VM_ENTRY_MARK;
1539   return get_Method()->is_scalarized_arg(idx);
1540 }
1541 
1542 bool ciMethod::has_scalarized_args() const {
1543   VM_ENTRY_MARK;
1544   return get_Method()->has_scalarized_args();
1545 }
1546 
1547 const GrowableArray<SigEntry>* ciMethod::get_sig_cc() const {
1548   VM_ENTRY_MARK;
1549   if (get_Method()->adapter() == NULL) {
1550     return NULL;
1551   }
1552   return get_Method()->adapter()->get_sig_cc();
1553 }
--- EOF ---