1 /*
   2  * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "ci/ciCallProfile.hpp"
  27 #include "ci/ciExceptionHandler.hpp"
  28 #include "ci/ciInstanceKlass.hpp"
  29 #include "ci/ciMethod.hpp"
  30 #include "ci/ciMethodBlocks.hpp"
  31 #include "ci/ciMethodData.hpp"
  32 #include "ci/ciStreams.hpp"
  33 #include "ci/ciSymbol.hpp"
  34 #include "ci/ciReplay.hpp"
  35 #include "ci/ciUtilities.inline.hpp"
  36 #include "classfile/systemDictionary.hpp"
  37 #include "compiler/abstractCompiler.hpp"
  38 #include "compiler/methodLiveness.hpp"
  39 #include "interpreter/interpreter.hpp"
  40 #include "interpreter/linkResolver.hpp"
  41 #include "interpreter/oopMapCache.hpp"
  42 #include "memory/allocation.inline.hpp"
  43 #include "memory/resourceArea.hpp"
  44 #include "oops/generateOopMap.hpp"
  45 #include "oops/method.inline.hpp"
  46 #include "oops/oop.inline.hpp"
  47 #include "prims/nativeLookup.hpp"
  48 #include "runtime/deoptimization.hpp"
  49 #include "runtime/handles.inline.hpp"
  50 #include "utilities/bitMap.inline.hpp"
  51 #include "utilities/xmlstream.hpp"
  52 #ifdef COMPILER2
  53 #include "ci/bcEscapeAnalyzer.hpp"
  54 #include "ci/ciTypeFlow.hpp"
  55 #include "oops/method.hpp"
  56 #endif
  57 
  58 // ciMethod
  59 //
  60 // This class represents a Method* in the HotSpot virtual
  61 // machine.
  62 
  63 
  64 // ------------------------------------------------------------------
  65 // ciMethod::ciMethod
  66 //
  67 // Loaded method.
  68 ciMethod::ciMethod(const methodHandle& h_m, ciInstanceKlass* holder) :
  69   ciMetadata(h_m()),
  70   _holder(holder)
  71 {
  72   assert(h_m() != NULL, "no null method");
  73 
  74   if (LogTouchedMethods) {
  75     h_m()->log_touched(Thread::current());
  76   }
  77   // These fields are always filled in in loaded methods.
  78   _flags = ciFlags(h_m()->access_flags());
  79 
  80   // Easy to compute, so fill them in now.
  81   _max_stack          = h_m()->max_stack();
  82   _max_locals         = h_m()->max_locals();
  83   _code_size          = h_m()->code_size();
  84   _intrinsic_id       = h_m()->intrinsic_id();
  85   _handler_count      = h_m()->exception_table_length();
  86   _size_of_parameters = h_m()->size_of_parameters();
  87   _uses_monitors      = h_m()->access_flags().has_monitor_bytecodes();
  88   _balanced_monitors  = !_uses_monitors || h_m()->access_flags().is_monitor_matching();
  89   _is_c1_compilable   = !h_m()->is_not_c1_compilable();
  90   _is_c2_compilable   = !h_m()->is_not_c2_compilable();
  91   _can_be_parsed      = true;
  92   _has_reserved_stack_access = h_m()->has_reserved_stack_access();
  93   _is_overpass        = h_m()->is_overpass();
  94   // Lazy fields, filled in on demand.  Require allocation.
  95   _code               = NULL;
  96   _exception_handlers = NULL;
  97   _liveness           = NULL;
  98   _method_blocks = NULL;
  99 #if defined(COMPILER2)
 100   _flow               = NULL;
 101   _bcea               = NULL;
 102 #endif // COMPILER2
 103 
 104   ciEnv *env = CURRENT_ENV;
 105   if (env->jvmti_can_hotswap_or_post_breakpoint()) {
 106     // 6328518 check hotswap conditions under the right lock.
 107     MutexLocker locker(Compile_lock);
 108     if (Dependencies::check_evol_method(h_m()) != NULL) {
 109       _is_c1_compilable = false;
 110       _is_c2_compilable = false;
 111       _can_be_parsed = false;
 112     }
 113   } else {
 114     CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
 115   }
 116 
 117   if (h_m()->method_holder()->is_linked()) {
 118     _can_be_statically_bound = h_m()->can_be_statically_bound();
 119   } else {
 120     // Have to use a conservative value in this case.
 121     _can_be_statically_bound = false;
 122   }
 123 
 124   // Adjust the definition of this condition to be more useful:
 125   // %%% take these conditions into account in vtable generation
 126   if (!_can_be_statically_bound && h_m()->is_private())
 127     _can_be_statically_bound = true;
 128   if (_can_be_statically_bound && h_m()->is_abstract())
 129     _can_be_statically_bound = false;
 130 
 131   // generating _signature may allow GC and therefore move m.
 132   // These fields are always filled in.
 133   _name = env->get_symbol(h_m()->name());
 134   ciSymbol* sig_symbol = env->get_symbol(h_m()->signature());
 135   constantPoolHandle cpool = h_m()->constants();
 136   _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol);
 137   _method_data = NULL;
 138   _nmethod_age = h_m()->nmethod_age();
 139   // Take a snapshot of these values, so they will be commensurate with the MDO.
 140   if (ProfileInterpreter || TieredCompilation) {
 141     int invcnt = h_m()->interpreter_invocation_count();
 142     // if the value overflowed report it as max int
 143     _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ;
 144     _interpreter_throwout_count   = h_m()->interpreter_throwout_count();
 145   } else {
 146     _interpreter_invocation_count = 0;
 147     _interpreter_throwout_count = 0;
 148   }
 149   if (_interpreter_invocation_count == 0)
 150     _interpreter_invocation_count = 1;
 151   _instructions_size = -1;
 152 #ifdef ASSERT
 153   if (ReplayCompiles) {
 154     ciReplay::initialize(this);
 155   }
 156 #endif
 157 }
 158 
 159 
 160 // ------------------------------------------------------------------
 161 // ciMethod::ciMethod
 162 //
 163 // Unloaded method.
 164 ciMethod::ciMethod(ciInstanceKlass* holder,
 165                    ciSymbol*        name,
 166                    ciSymbol*        signature,
 167                    ciInstanceKlass* accessor) :
 168   ciMetadata((Metadata*)NULL),
 169   _name(                   name),
 170   _holder(                 holder),
 171   _method_data(            NULL),
 172   _method_blocks(          NULL),
 173   _intrinsic_id(           vmIntrinsics::_none),
 174   _instructions_size(-1),
 175   _can_be_statically_bound(false),
 176   _liveness(               NULL)
 177 #if defined(COMPILER2)
 178   ,
 179   _flow(                   NULL),
 180   _bcea(                   NULL)
 181 #endif // COMPILER2
 182 {
 183   // Usually holder and accessor are the same type but in some cases
 184   // the holder has the wrong class loader (e.g. invokedynamic call
 185   // sites) so we pass the accessor.
 186   _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature);
 187 }
 188 
 189 
 190 // ------------------------------------------------------------------
 191 // ciMethod::load_code
 192 //
 193 // Load the bytecodes and exception handler table for this method.
 194 void ciMethod::load_code() {
 195   VM_ENTRY_MARK;
 196   assert(is_loaded(), "only loaded methods have code");
 197 
 198   Method* me = get_Method();
 199   Arena* arena = CURRENT_THREAD_ENV->arena();
 200 
 201   // Load the bytecodes.
 202   _code = (address)arena->Amalloc(code_size());
 203   memcpy(_code, me->code_base(), code_size());
 204 
 205 #if INCLUDE_JVMTI
 206   // Revert any breakpoint bytecodes in ci's copy
 207   if (me->number_of_breakpoints() > 0) {
 208     BreakpointInfo* bp = me->method_holder()->breakpoints();
 209     for (; bp != NULL; bp = bp->next()) {
 210       if (bp->match(me)) {
 211         code_at_put(bp->bci(), bp->orig_bytecode());
 212       }
 213     }
 214   }
 215 #endif
 216 
 217   // And load the exception table.
 218   ExceptionTable exc_table(me);
 219 
 220   // Allocate one extra spot in our list of exceptions.  This
 221   // last entry will be used to represent the possibility that
 222   // an exception escapes the method.  See ciExceptionHandlerStream
 223   // for details.
 224   _exception_handlers =
 225     (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*)
 226                                          * (_handler_count + 1));
 227   if (_handler_count > 0) {
 228     for (int i=0; i<_handler_count; i++) {
 229       _exception_handlers[i] = new (arena) ciExceptionHandler(
 230                                 holder(),
 231             /* start    */      exc_table.start_pc(i),
 232             /* limit    */      exc_table.end_pc(i),
 233             /* goto pc  */      exc_table.handler_pc(i),
 234             /* cp index */      exc_table.catch_type_index(i));
 235     }
 236   }
 237 
 238   // Put an entry at the end of our list to represent the possibility
 239   // of exceptional exit.
 240   _exception_handlers[_handler_count] =
 241     new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0);
 242 
 243   if (CIPrintMethodCodes) {
 244     print_codes();
 245   }
 246 }
 247 
 248 
 249 // ------------------------------------------------------------------
 250 // ciMethod::has_linenumber_table
 251 //
 252 // length unknown until decompression
 253 bool    ciMethod::has_linenumber_table() const {
 254   check_is_loaded();
 255   VM_ENTRY_MARK;
 256   return get_Method()->has_linenumber_table();
 257 }
 258 
 259 
 260 // ------------------------------------------------------------------
 261 // ciMethod::compressed_linenumber_table
 262 u_char* ciMethod::compressed_linenumber_table() const {
 263   check_is_loaded();
 264   VM_ENTRY_MARK;
 265   return get_Method()->compressed_linenumber_table();
 266 }
 267 
 268 
 269 // ------------------------------------------------------------------
 270 // ciMethod::line_number_from_bci
 271 int ciMethod::line_number_from_bci(int bci) const {
 272   check_is_loaded();
 273   VM_ENTRY_MARK;
 274   return get_Method()->line_number_from_bci(bci);
 275 }
 276 
 277 
 278 // ------------------------------------------------------------------
 279 // ciMethod::vtable_index
 280 //
 281 // Get the position of this method's entry in the vtable, if any.
 282 int ciMethod::vtable_index() {
 283   check_is_loaded();
 284   assert(holder()->is_linked(), "must be linked");
 285   VM_ENTRY_MARK;
 286   return get_Method()->vtable_index();
 287 }
 288 
 289 
 290 // ------------------------------------------------------------------
 291 // ciMethod::native_entry
 292 //
 293 // Get the address of this method's native code, if any.
 294 address ciMethod::native_entry() {
 295   check_is_loaded();
 296   assert(flags().is_native(), "must be native method");
 297   VM_ENTRY_MARK;
 298   Method* method = get_Method();
 299   address entry = method->native_function();
 300   assert(entry != NULL, "must be valid entry point");
 301   return entry;
 302 }
 303 
 304 
 305 // ------------------------------------------------------------------
 306 // ciMethod::interpreter_entry
 307 //
 308 // Get the entry point for running this method in the interpreter.
 309 address ciMethod::interpreter_entry() {
 310   check_is_loaded();
 311   VM_ENTRY_MARK;
 312   methodHandle mh(THREAD, get_Method());
 313   return Interpreter::entry_for_method(mh);
 314 }
 315 
 316 
 317 // ------------------------------------------------------------------
 318 // ciMethod::uses_balanced_monitors
 319 //
 320 // Does this method use monitors in a strict stack-disciplined manner?
 321 bool ciMethod::has_balanced_monitors() {
 322   check_is_loaded();
 323   if (_balanced_monitors) return true;
 324 
 325   // Analyze the method to see if monitors are used properly.
 326   VM_ENTRY_MARK;
 327   methodHandle method(THREAD, get_Method());
 328   assert(method->has_monitor_bytecodes(), "should have checked this");
 329 
 330   // Check to see if a previous compilation computed the
 331   // monitor-matching analysis.
 332   if (method->guaranteed_monitor_matching()) {
 333     _balanced_monitors = true;
 334     return true;
 335   }
 336 
 337   {
 338     EXCEPTION_MARK;
 339     ResourceMark rm(THREAD);
 340     GeneratePairingInfo gpi(method);
 341     gpi.compute_map(CATCH);
 342     if (!gpi.monitor_safe()) {
 343       return false;
 344     }
 345     method->set_guaranteed_monitor_matching();
 346     _balanced_monitors = true;
 347   }
 348   return true;
 349 }
 350 
 351 
 352 // ------------------------------------------------------------------
 353 // ciMethod::get_flow_analysis
 354 ciTypeFlow* ciMethod::get_flow_analysis() {
 355 #if defined(COMPILER2)
 356   if (_flow == NULL) {
 357     ciEnv* env = CURRENT_ENV;
 358     _flow = new (env->arena()) ciTypeFlow(env, this);
 359     _flow->do_flow();
 360   }
 361   return _flow;
 362 #else // COMPILER2
 363   ShouldNotReachHere();
 364   return NULL;
 365 #endif // COMPILER2
 366 }
 367 
 368 
 369 // ------------------------------------------------------------------
 370 // ciMethod::get_osr_flow_analysis
 371 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) {
 372 #if defined(COMPILER2)
 373   // OSR entry points are always place after a call bytecode of some sort
 374   assert(osr_bci >= 0, "must supply valid OSR entry point");
 375   ciEnv* env = CURRENT_ENV;
 376   ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci);
 377   flow->do_flow();
 378   return flow;
 379 #else // COMPILER2
 380   ShouldNotReachHere();
 381   return NULL;
 382 #endif // COMPILER2
 383 }
 384 
 385 // ------------------------------------------------------------------
 386 // ciMethod::raw_liveness_at_bci
 387 //
 388 // Which local variables are live at a specific bci?
 389 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) {
 390   check_is_loaded();
 391   if (_liveness == NULL) {
 392     // Create the liveness analyzer.
 393     Arena* arena = CURRENT_ENV->arena();
 394     _liveness = new (arena) MethodLiveness(arena, this);
 395     _liveness->compute_liveness();
 396   }
 397   return _liveness->get_liveness_at(bci);
 398 }
 399 
 400 // ------------------------------------------------------------------
 401 // ciMethod::liveness_at_bci
 402 //
 403 // Which local variables are live at a specific bci?  When debugging
 404 // will return true for all locals in some cases to improve debug
 405 // information.
 406 MethodLivenessResult ciMethod::liveness_at_bci(int bci) {
 407   if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot) {
 408     // Keep all locals live for the user's edification and amusement.
 409     MethodLivenessResult result(_max_locals);
 410     result.set_range(0, _max_locals);
 411     result.set_is_valid();
 412     return result;
 413   }
 414   return raw_liveness_at_bci(bci);
 415 }
 416 
 417 // ciMethod::live_local_oops_at_bci
 418 //
 419 // find all the live oops in the locals array for a particular bci
 420 // Compute what the interpreter believes by using the interpreter
 421 // oopmap generator. This is used as a double check during osr to
 422 // guard against conservative result from MethodLiveness making us
 423 // think a dead oop is live.  MethodLiveness is conservative in the
 424 // sense that it may consider locals to be live which cannot be live,
 425 // like in the case where a local could contain an oop or  a primitive
 426 // along different paths.  In that case the local must be dead when
 427 // those paths merge. Since the interpreter's viewpoint is used when
 428 // gc'ing an interpreter frame we need to use its viewpoint  during
 429 // OSR when loading the locals.
 430 
 431 ResourceBitMap ciMethod::live_local_oops_at_bci(int bci) {
 432   VM_ENTRY_MARK;
 433   InterpreterOopMap mask;
 434   OopMapCache::compute_one_oop_map(get_Method(), bci, &mask);
 435   int mask_size = max_locals();
 436   ResourceBitMap result(mask_size);
 437   int i;
 438   for (i = 0; i < mask_size ; i++ ) {
 439     if (mask.is_oop(i)) result.set_bit(i);
 440   }
 441   return result;
 442 }
 443 
 444 
 445 #ifdef COMPILER1
 446 // ------------------------------------------------------------------
 447 // ciMethod::bci_block_start
 448 //
 449 // Marks all bcis where a new basic block starts
 450 const BitMap& ciMethod::bci_block_start() {
 451   check_is_loaded();
 452   if (_liveness == NULL) {
 453     // Create the liveness analyzer.
 454     Arena* arena = CURRENT_ENV->arena();
 455     _liveness = new (arena) MethodLiveness(arena, this);
 456     _liveness->compute_liveness();
 457   }
 458 
 459   return _liveness->get_bci_block_start();
 460 }
 461 #endif // COMPILER1
 462 
 463 
 464 // ------------------------------------------------------------------
 465 // ciMethod::check_overflow
 466 //
 467 // Check whether the profile counter is overflowed and adjust if true.
 468 // For invoke* it will turn negative values into max_jint,
 469 // and for checkcast/aastore/instanceof turn positive values into min_jint.
 470 int ciMethod::check_overflow(int c, Bytecodes::Code code) {
 471   switch (code) {
 472     case Bytecodes::_aastore:    // fall-through
 473     case Bytecodes::_checkcast:  // fall-through
 474     case Bytecodes::_instanceof: {
 475       return (c > 0 ? min_jint : c); // always non-positive
 476     }
 477     default: {
 478       assert(Bytecodes::is_invoke(code), "%s", Bytecodes::name(code));
 479       return (c < 0 ? max_jint : c); // always non-negative
 480     }
 481   }
 482 }
 483 
 484 
 485 // ------------------------------------------------------------------
 486 // ciMethod::call_profile_at_bci
 487 //
 488 // Get the ciCallProfile for the invocation of this method.
 489 // Also reports receiver types for non-call type checks (if TypeProfileCasts).
 490 ciCallProfile ciMethod::call_profile_at_bci(int bci) {
 491   ResourceMark rm;
 492   ciCallProfile result;
 493   if (method_data() != NULL && method_data()->is_mature()) {
 494     ciProfileData* data = method_data()->bci_to_data(bci);
 495     if (data != NULL && data->is_CounterData()) {
 496       // Every profiled call site has a counter.
 497       int count = check_overflow(data->as_CounterData()->count(), java_code_at_bci(bci));
 498 
 499       if (!data->is_ReceiverTypeData()) {
 500         result._receiver_count[0] = 0;  // that's a definite zero
 501       } else { // ReceiverTypeData is a subclass of CounterData
 502         ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData();
 503         // In addition, virtual call sites have receiver type information
 504         int receivers_count_total = 0;
 505         int morphism = 0;
 506         // Precompute morphism for the possible fixup
 507         for (uint i = 0; i < call->row_limit(); i++) {
 508           ciKlass* receiver = call->receiver(i);
 509           if (receiver == NULL)  continue;
 510           morphism++;
 511         }
 512         int epsilon = 0;
 513         if (TieredCompilation) {
 514           // For a call, it is assumed that either the type of the receiver(s)
 515           // is recorded or an associated counter is incremented, but not both. With
 516           // tiered compilation, however, both can happen due to the interpreter and
 517           // C1 profiling invocations differently. Address that inconsistency here.
 518           if (morphism == 1 && count > 0) {
 519             epsilon = count;
 520             count = 0;
 521           }
 522         }
 523         for (uint i = 0; i < call->row_limit(); i++) {
 524           ciKlass* receiver = call->receiver(i);
 525           if (receiver == NULL)  continue;
 526           int rcount = saturated_add(call->receiver_count(i), epsilon);
 527           if (rcount == 0) rcount = 1; // Should be valid value
 528           receivers_count_total = saturated_add(receivers_count_total, rcount);
 529           // Add the receiver to result data.
 530           result.add_receiver(receiver, rcount);
 531           // If we extend profiling to record methods,
 532           // we will set result._method also.
 533         }
 534         // Determine call site's morphism.
 535         // The call site count is 0 with known morphism (only 1 or 2 receivers)
 536         // or < 0 in the case of a type check failure for checkcast, aastore, instanceof.
 537         // The call site count is > 0 in the case of a polymorphic virtual call.
 538         if (morphism > 0 && morphism == result._limit) {
 539            // The morphism <= MorphismLimit.
 540            if ((morphism <  ciCallProfile::MorphismLimit) ||
 541                (morphism == ciCallProfile::MorphismLimit && count == 0)) {
 542 #ifdef ASSERT
 543              if (count > 0) {
 544                this->print_short_name(tty);
 545                tty->print_cr(" @ bci:%d", bci);
 546                this->print_codes();
 547                assert(false, "this call site should not be polymorphic");
 548              }
 549 #endif
 550              result._morphism = morphism;
 551            }
 552         }
 553         // Make the count consistent if this is a call profile. If count is
 554         // zero or less, presume that this is a typecheck profile and
 555         // do nothing.  Otherwise, increase count to be the sum of all
 556         // receiver's counts.
 557         if (count >= 0) {
 558           count = saturated_add(count, receivers_count_total);
 559         }
 560       }
 561       result._count = count;
 562     }
 563   }
 564   return result;
 565 }
 566 
 567 // ------------------------------------------------------------------
 568 // Add new receiver and sort data by receiver's profile count.
 569 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) {
 570   // Add new receiver and sort data by receiver's counts when we have space
 571   // for it otherwise replace the less called receiver (less called receiver
 572   // is placed to the last array element which is not used).
 573   // First array's element contains most called receiver.
 574   int i = _limit;
 575   for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) {
 576     _receiver[i] = _receiver[i-1];
 577     _receiver_count[i] = _receiver_count[i-1];
 578   }
 579   _receiver[i] = receiver;
 580   _receiver_count[i] = receiver_count;
 581   if (_limit < MorphismLimit) _limit++;
 582 }
 583 
 584 
 585 void ciMethod::assert_virtual_call_type_ok(int bci) {
 586   assert(java_code_at_bci(bci) == Bytecodes::_invokevirtual ||
 587          java_code_at_bci(bci) == Bytecodes::_invokeinterface, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 588 }
 589 
 590 void ciMethod::assert_call_type_ok(int bci) {
 591   assert(java_code_at_bci(bci) == Bytecodes::_invokestatic ||
 592          java_code_at_bci(bci) == Bytecodes::_invokespecial ||
 593          java_code_at_bci(bci) == Bytecodes::_invokedynamic, "unexpected bytecode %s", Bytecodes::name(java_code_at_bci(bci)));
 594 }
 595 
 596 /**
 597  * Check whether profiling provides a type for the argument i to the
 598  * call at bci bci
 599  *
 600  * @param [in]bci         bci of the call
 601  * @param [in]i           argument number
 602  * @param [out]type       profiled type of argument, NULL if none
 603  * @param [out]ptr_kind   whether always null, never null or maybe null
 604  * @return                true if profiling exists
 605  *
 606  */
 607 bool ciMethod::argument_profiled_type(int bci, int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 608   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 609     ciProfileData* data = method_data()->bci_to_data(bci);
 610     if (data != NULL) {
 611       if (data->is_VirtualCallTypeData()) {
 612         assert_virtual_call_type_ok(bci);
 613         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 614         if (i >= call->number_of_arguments()) {
 615           return false;
 616         }
 617         type = call->valid_argument_type(i);
 618         ptr_kind = call->argument_ptr_kind(i);
 619         return true;
 620       } else if (data->is_CallTypeData()) {
 621         assert_call_type_ok(bci);
 622         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 623         if (i >= call->number_of_arguments()) {
 624           return false;
 625         }
 626         type = call->valid_argument_type(i);
 627         ptr_kind = call->argument_ptr_kind(i);
 628         return true;
 629       }
 630     }
 631   }
 632   return false;
 633 }
 634 
 635 /**
 636  * Check whether profiling provides a type for the return value from
 637  * the call at bci bci
 638  *
 639  * @param [in]bci         bci of the call
 640  * @param [out]type       profiled type of argument, NULL if none
 641  * @param [out]ptr_kind   whether always null, never null or maybe null
 642  * @return                true if profiling exists
 643  *
 644  */
 645 bool ciMethod::return_profiled_type(int bci, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 646   if (MethodData::profile_return() && method_data() != NULL && method_data()->is_mature()) {
 647     ciProfileData* data = method_data()->bci_to_data(bci);
 648     if (data != NULL) {
 649       if (data->is_VirtualCallTypeData()) {
 650         assert_virtual_call_type_ok(bci);
 651         ciVirtualCallTypeData* call = (ciVirtualCallTypeData*)data->as_VirtualCallTypeData();
 652         if (call->has_return()) {
 653           type = call->valid_return_type();
 654           ptr_kind = call->return_ptr_kind();
 655           return true;
 656         }
 657       } else if (data->is_CallTypeData()) {
 658         assert_call_type_ok(bci);
 659         ciCallTypeData* call = (ciCallTypeData*)data->as_CallTypeData();
 660         if (call->has_return()) {
 661           type = call->valid_return_type();
 662           ptr_kind = call->return_ptr_kind();
 663         }
 664         return true;
 665       }
 666     }
 667   }
 668   return false;
 669 }
 670 
 671 /**
 672  * Check whether profiling provides a type for the parameter i
 673  *
 674  * @param [in]i           parameter number
 675  * @param [out]type       profiled type of parameter, NULL if none
 676  * @param [out]ptr_kind   whether always null, never null or maybe null
 677  * @return                true if profiling exists
 678  *
 679  */
 680 bool ciMethod::parameter_profiled_type(int i, ciKlass*& type, ProfilePtrKind& ptr_kind) {
 681   if (MethodData::profile_parameters() && method_data() != NULL && method_data()->is_mature()) {
 682     ciParametersTypeData* parameters = method_data()->parameters_type_data();
 683     if (parameters != NULL && i < parameters->number_of_parameters()) {
 684       type = parameters->valid_parameter_type(i);
 685       ptr_kind = parameters->parameter_ptr_kind(i);
 686       return true;
 687     }
 688   }
 689   return false;
 690 }
 691 
 692 
 693 // ------------------------------------------------------------------
 694 // ciMethod::find_monomorphic_target
 695 //
 696 // Given a certain calling environment, find the monomorphic target
 697 // for the call.  Return NULL if the call is not monomorphic in
 698 // its calling environment, or if there are only abstract methods.
 699 // The returned method is never abstract.
 700 // Note: If caller uses a non-null result, it must inform dependencies
 701 // via assert_unique_concrete_method or assert_leaf_type.
 702 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller,
 703                                             ciInstanceKlass* callee_holder,
 704                                             ciInstanceKlass* actual_recv,
 705                                             bool check_access) {
 706   check_is_loaded();
 707 
 708   if (actual_recv->is_interface()) {
 709     // %%% We cannot trust interface types, yet.  See bug 6312651.
 710     return NULL;
 711   }
 712 
 713   ciMethod* root_m = resolve_invoke(caller, actual_recv, check_access);
 714   if (root_m == NULL) {
 715     // Something went wrong looking up the actual receiver method.
 716     return NULL;
 717   }
 718   assert(!root_m->is_abstract(), "resolve_invoke promise");
 719 
 720   // Make certain quick checks even if UseCHA is false.
 721 
 722   // Is it private or final?
 723   if (root_m->can_be_statically_bound()) {
 724     return root_m;
 725   }
 726 
 727   if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) {
 728     // Easy case.  There is no other place to put a method, so don't bother
 729     // to go through the VM_ENTRY_MARK and all the rest.
 730     return root_m;
 731   }
 732 
 733   // Array methods (clone, hashCode, etc.) are always statically bound.
 734   // If we were to see an array type here, we'd return root_m.
 735   // However, this method processes only ciInstanceKlasses.  (See 4962591.)
 736   // The inline_native_clone intrinsic narrows Object to T[] properly,
 737   // so there is no need to do the same job here.
 738 
 739   if (!UseCHA)  return NULL;
 740 
 741   VM_ENTRY_MARK;
 742 
 743   // Disable CHA for default methods for now
 744   if (root_m->is_default_method()) {
 745     return NULL;
 746   }
 747 
 748   methodHandle target;
 749   {
 750     MutexLocker locker(Compile_lock);
 751     Klass* context = actual_recv->get_Klass();
 752     target = Dependencies::find_unique_concrete_method(context,
 753                                                        root_m->get_Method());
 754     // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods.
 755   }
 756 
 757 #ifndef PRODUCT
 758   if (TraceDependencies && target() != NULL && target() != root_m->get_Method()) {
 759     tty->print("found a non-root unique target method");
 760     tty->print_cr("  context = %s", actual_recv->get_Klass()->external_name());
 761     tty->print("  method  = ");
 762     target->print_short_name(tty);
 763     tty->cr();
 764   }
 765 #endif //PRODUCT
 766 
 767   if (target() == NULL) {
 768     return NULL;
 769   }
 770   if (target() == root_m->get_Method()) {
 771     return root_m;
 772   }
 773   if (!root_m->is_public() &&
 774       !root_m->is_protected()) {
 775     // If we are going to reason about inheritance, it's easiest
 776     // if the method in question is public, protected, or private.
 777     // If the answer is not root_m, it is conservatively correct
 778     // to return NULL, even if the CHA encountered irrelevant
 779     // methods in other packages.
 780     // %%% TO DO: Work out logic for package-private methods
 781     // with the same name but different vtable indexes.
 782     return NULL;
 783   }
 784   assert(!target()->is_abstract(), "not allowed");
 785   return CURRENT_THREAD_ENV->get_method(target());
 786 }
 787 
 788 // ------------------------------------------------------------------
 789 // ciMethod::can_be_statically_bound
 790 //
 791 // Tries to determine whether a method can be statically bound in some context.
 792 bool ciMethod::can_be_statically_bound(ciInstanceKlass* context) const {
 793   return (holder() == context) && can_be_statically_bound();
 794 }
 795 
 796 // ------------------------------------------------------------------
 797 // ciMethod::resolve_invoke
 798 //
 799 // Given a known receiver klass, find the target for the call.
 800 // Return NULL if the call has no target or the target is abstract.
 801 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver, bool check_access) {
 802    check_is_loaded();
 803    VM_ENTRY_MARK;
 804 
 805    Klass* caller_klass = caller->get_Klass();
 806    Klass* recv         = exact_receiver->get_Klass();
 807    Klass* resolved     = holder()->get_Klass();
 808    Symbol* h_name      = name()->get_symbol();
 809    Symbol* h_signature = signature()->get_symbol();
 810 
 811    LinkInfo link_info(resolved, h_name, h_signature, caller_klass,
 812                       check_access ? LinkInfo::needs_access_check : LinkInfo::skip_access_check);
 813    methodHandle m;
 814    // Only do exact lookup if receiver klass has been linked.  Otherwise,
 815    // the vtable has not been setup, and the LinkResolver will fail.
 816    if (recv->is_array_klass()
 817         ||
 818        (InstanceKlass::cast(recv)->is_linked() && !exact_receiver->is_interface())) {
 819      if (holder()->is_interface()) {
 820        m = LinkResolver::resolve_interface_call_or_null(recv, link_info);
 821      } else {
 822        m = LinkResolver::resolve_virtual_call_or_null(recv, link_info);
 823      }
 824    }
 825 
 826    if (m.is_null()) {
 827      // Return NULL only if there was a problem with lookup (uninitialized class, etc.)
 828      return NULL;
 829    }
 830 
 831    ciMethod* result = this;
 832    if (m() != get_Method()) {
 833      result = CURRENT_THREAD_ENV->get_method(m());
 834    }
 835 
 836    // Don't return abstract methods because they aren't
 837    // optimizable or interesting.
 838    if (result->is_abstract()) {
 839      return NULL;
 840    } else {
 841      return result;
 842    }
 843 }
 844 
 845 // ------------------------------------------------------------------
 846 // ciMethod::resolve_vtable_index
 847 //
 848 // Given a known receiver klass, find the vtable index for the call.
 849 // Return Method::invalid_vtable_index if the vtable_index is unknown.
 850 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) {
 851    check_is_loaded();
 852 
 853    int vtable_index = Method::invalid_vtable_index;
 854    // Only do lookup if receiver klass has been linked.  Otherwise,
 855    // the vtable has not been setup, and the LinkResolver will fail.
 856    if (!receiver->is_interface()
 857        && (!receiver->is_instance_klass() ||
 858            receiver->as_instance_klass()->is_linked())) {
 859      VM_ENTRY_MARK;
 860 
 861      Klass* caller_klass = caller->get_Klass();
 862      Klass* recv         = receiver->get_Klass();
 863      Symbol* h_name = name()->get_symbol();
 864      Symbol* h_signature = signature()->get_symbol();
 865 
 866      LinkInfo link_info(recv, h_name, h_signature, caller_klass);
 867      vtable_index = LinkResolver::resolve_virtual_vtable_index(recv, link_info);
 868      if (vtable_index == Method::nonvirtual_vtable_index) {
 869        // A statically bound method.  Return "no such index".
 870        vtable_index = Method::invalid_vtable_index;
 871      }
 872    }
 873 
 874    return vtable_index;
 875 }
 876 
 877 // ------------------------------------------------------------------
 878 // ciMethod::interpreter_call_site_count
 879 int ciMethod::interpreter_call_site_count(int bci) {
 880   if (method_data() != NULL) {
 881     ResourceMark rm;
 882     ciProfileData* data = method_data()->bci_to_data(bci);
 883     if (data != NULL && data->is_CounterData()) {
 884       return scale_count(data->as_CounterData()->count());
 885     }
 886   }
 887   return -1;  // unknown
 888 }
 889 
 890 // ------------------------------------------------------------------
 891 // ciMethod::get_field_at_bci
 892 ciField* ciMethod::get_field_at_bci(int bci, bool &will_link) {
 893   ciBytecodeStream iter(this);
 894   iter.reset_to_bci(bci);
 895   iter.next();
 896   return iter.get_field(will_link);
 897 }
 898 
 899 // ------------------------------------------------------------------
 900 // ciMethod::get_method_at_bci
 901 ciMethod* ciMethod::get_method_at_bci(int bci, bool &will_link, ciSignature* *declared_signature) {
 902   ciBytecodeStream iter(this);
 903   iter.reset_to_bci(bci);
 904   iter.next();
 905   return iter.get_method(will_link, declared_signature);
 906 }
 907 
 908 // ------------------------------------------------------------------
 909 ciKlass* ciMethod::get_declared_method_holder_at_bci(int bci) {
 910   ciBytecodeStream iter(this);
 911   iter.reset_to_bci(bci);
 912   iter.next();
 913   return iter.get_declared_method_holder();
 914 }
 915 
 916 // ------------------------------------------------------------------
 917 // Adjust a CounterData count to be commensurate with
 918 // interpreter_invocation_count.  If the MDO exists for
 919 // only 25% of the time the method exists, then the
 920 // counts in the MDO should be scaled by 4X, so that
 921 // they can be usefully and stably compared against the
 922 // invocation counts in methods.
 923 int ciMethod::scale_count(int count, float prof_factor) {
 924   if (count > 0 && method_data() != NULL) {
 925     int counter_life;
 926     int method_life = interpreter_invocation_count();
 927     if (TieredCompilation) {
 928       // In tiered the MDO's life is measured directly, so just use the snapshotted counters
 929       counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count());
 930     } else {
 931       int current_mileage = method_data()->current_mileage();
 932       int creation_mileage = method_data()->creation_mileage();
 933       counter_life = current_mileage - creation_mileage;
 934     }
 935 
 936     // counter_life due to backedge_counter could be > method_life
 937     if (counter_life > method_life)
 938       counter_life = method_life;
 939     if (0 < counter_life && counter_life <= method_life) {
 940       count = (int)((double)count * prof_factor * method_life / counter_life + 0.5);
 941       count = (count > 0) ? count : 1;
 942     }
 943   }
 944   return count;
 945 }
 946 
 947 
 948 // ------------------------------------------------------------------
 949 // ciMethod::is_special_get_caller_class_method
 950 //
 951 bool ciMethod::is_ignored_by_security_stack_walk() const {
 952   check_is_loaded();
 953   VM_ENTRY_MARK;
 954   return get_Method()->is_ignored_by_security_stack_walk();
 955 }
 956 
 957 // ------------------------------------------------------------------
 958 // ciMethod::needs_clinit_barrier
 959 //
 960 bool ciMethod::needs_clinit_barrier() const {
 961   check_is_loaded();
 962   return is_static() && !holder()->is_initialized();
 963 }
 964 
 965 // ------------------------------------------------------------------
 966 // invokedynamic support
 967 
 968 // ------------------------------------------------------------------
 969 // ciMethod::is_method_handle_intrinsic
 970 //
 971 // Return true if the method is an instance of the JVM-generated
 972 // signature-polymorphic MethodHandle methods, _invokeBasic, _linkToVirtual, etc.
 973 bool ciMethod::is_method_handle_intrinsic() const {
 974   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 975   return (MethodHandles::is_signature_polymorphic(iid) &&
 976           MethodHandles::is_signature_polymorphic_intrinsic(iid));
 977 }
 978 
 979 // ------------------------------------------------------------------
 980 // ciMethod::is_compiled_lambda_form
 981 //
 982 // Return true if the method is a generated MethodHandle adapter.
 983 // These are built by Java code.
 984 bool ciMethod::is_compiled_lambda_form() const {
 985   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
 986   return iid == vmIntrinsics::_compiledLambdaForm;
 987 }
 988 
 989 // ------------------------------------------------------------------
 990 // ciMethod::is_object_initializer
 991 //
 992 bool ciMethod::is_object_initializer() const {
 993    return name() == ciSymbol::object_initializer_name();
 994 }
 995 
 996 // ------------------------------------------------------------------
 997 // ciMethod::has_member_arg
 998 //
 999 // Return true if the method is a linker intrinsic like _linkToVirtual.
1000 // These are built by the JVM.
1001 bool ciMethod::has_member_arg() const {
1002   vmIntrinsics::ID iid = _intrinsic_id;  // do not check if loaded
1003   return (MethodHandles::is_signature_polymorphic(iid) &&
1004           MethodHandles::has_member_arg(iid));
1005 }
1006 
1007 // ------------------------------------------------------------------
1008 // ciMethod::ensure_method_data
1009 //
1010 // Generate new MethodData* objects at compile time.
1011 // Return true if allocation was successful or no MDO is required.
1012 bool ciMethod::ensure_method_data(const methodHandle& h_m) {
1013   EXCEPTION_CONTEXT;
1014   if (is_native() || is_abstract() || h_m()->is_accessor()) {
1015     return true;
1016   }
1017   if (h_m()->method_data() == NULL) {
1018     Method::build_interpreter_method_data(h_m, THREAD);
1019     if (HAS_PENDING_EXCEPTION) {
1020       CLEAR_PENDING_EXCEPTION;
1021     }
1022   }
1023   if (h_m()->method_data() != NULL) {
1024     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1025     _method_data->load_data();
1026     return true;
1027   } else {
1028     _method_data = CURRENT_ENV->get_empty_methodData();
1029     return false;
1030   }
1031 }
1032 
1033 // public, retroactive version
1034 bool ciMethod::ensure_method_data() {
1035   bool result = true;
1036   if (_method_data == NULL || _method_data->is_empty()) {
1037     GUARDED_VM_ENTRY({
1038       result = ensure_method_data(get_Method());
1039     });
1040   }
1041   return result;
1042 }
1043 
1044 
1045 // ------------------------------------------------------------------
1046 // ciMethod::method_data
1047 //
1048 ciMethodData* ciMethod::method_data() {
1049   if (_method_data != NULL) {
1050     return _method_data;
1051   }
1052   VM_ENTRY_MARK;
1053   ciEnv* env = CURRENT_ENV;
1054   Thread* my_thread = JavaThread::current();
1055   methodHandle h_m(my_thread, get_Method());
1056 
1057   if (h_m()->method_data() != NULL) {
1058     _method_data = CURRENT_ENV->get_method_data(h_m()->method_data());
1059     _method_data->load_data();
1060   } else {
1061     _method_data = CURRENT_ENV->get_empty_methodData();
1062   }
1063   return _method_data;
1064 
1065 }
1066 
1067 // ------------------------------------------------------------------
1068 // ciMethod::method_data_or_null
1069 // Returns a pointer to ciMethodData if MDO exists on the VM side,
1070 // NULL otherwise.
1071 ciMethodData* ciMethod::method_data_or_null() {
1072   ciMethodData *md = method_data();
1073   if (md->is_empty()) {
1074     return NULL;
1075   }
1076   return md;
1077 }
1078 
1079 // ------------------------------------------------------------------
1080 // ciMethod::ensure_method_counters
1081 //
1082 MethodCounters* ciMethod::ensure_method_counters() {
1083   check_is_loaded();
1084   VM_ENTRY_MARK;
1085   methodHandle mh(THREAD, get_Method());
1086   MethodCounters* method_counters = mh->get_method_counters(CHECK_NULL);
1087   return method_counters;
1088 }
1089 
1090 // ------------------------------------------------------------------
1091 // ciMethod::has_option
1092 //
1093 bool ciMethod::has_option(const char* option) {
1094   check_is_loaded();
1095   VM_ENTRY_MARK;
1096   methodHandle mh(THREAD, get_Method());
1097   return CompilerOracle::has_option_string(mh, option);
1098 }
1099 
1100 // ------------------------------------------------------------------
1101 // ciMethod::has_option_value
1102 //
1103 bool ciMethod::has_option_value(const char* option, double& value) {
1104   check_is_loaded();
1105   VM_ENTRY_MARK;
1106   methodHandle mh(THREAD, get_Method());
1107   return CompilerOracle::has_option_value(mh, option, value);
1108 }
1109 // ------------------------------------------------------------------
1110 // ciMethod::can_be_compiled
1111 //
1112 // Have previous compilations of this method succeeded?
1113 bool ciMethod::can_be_compiled() {
1114   check_is_loaded();
1115   ciEnv* env = CURRENT_ENV;
1116   if (is_c1_compile(env->comp_level())) {
1117     return _is_c1_compilable;
1118   }
1119   return _is_c2_compilable;
1120 }
1121 
1122 // ------------------------------------------------------------------
1123 // ciMethod::set_not_compilable
1124 //
1125 // Tell the VM that this method cannot be compiled at all.
1126 void ciMethod::set_not_compilable(const char* reason) {
1127   check_is_loaded();
1128   VM_ENTRY_MARK;
1129   ciEnv* env = CURRENT_ENV;
1130   if (is_c1_compile(env->comp_level())) {
1131     _is_c1_compilable = false;
1132   } else {
1133     _is_c2_compilable = false;
1134   }
1135   get_Method()->set_not_compilable(reason, env->comp_level());
1136 }
1137 
1138 // ------------------------------------------------------------------
1139 // ciMethod::can_be_osr_compiled
1140 //
1141 // Have previous compilations of this method succeeded?
1142 //
1143 // Implementation note: the VM does not currently keep track
1144 // of failed OSR compilations per bci.  The entry_bci parameter
1145 // is currently unused.
1146 bool ciMethod::can_be_osr_compiled(int entry_bci) {
1147   check_is_loaded();
1148   VM_ENTRY_MARK;
1149   ciEnv* env = CURRENT_ENV;
1150   return !get_Method()->is_not_osr_compilable(env->comp_level());
1151 }
1152 
1153 // ------------------------------------------------------------------
1154 // ciMethod::has_compiled_code
1155 bool ciMethod::has_compiled_code() {
1156   return instructions_size() > 0;
1157 }
1158 
1159 int ciMethod::comp_level() {
1160   check_is_loaded();
1161   VM_ENTRY_MARK;
1162   CompiledMethod* nm = get_Method()->code();
1163   if (nm != NULL) return nm->comp_level();
1164   return 0;
1165 }
1166 
1167 int ciMethod::highest_osr_comp_level() {
1168   check_is_loaded();
1169   VM_ENTRY_MARK;
1170   return get_Method()->highest_osr_comp_level();
1171 }
1172 
1173 // ------------------------------------------------------------------
1174 // ciMethod::code_size_for_inlining
1175 //
1176 // Code size for inlining decisions.  This method returns a code
1177 // size of 1 for methods which has the ForceInline annotation.
1178 int ciMethod::code_size_for_inlining() {
1179   check_is_loaded();
1180   if (get_Method()->force_inline()) {
1181     return 1;
1182   }
1183   return code_size();
1184 }
1185 
1186 // ------------------------------------------------------------------
1187 // ciMethod::instructions_size
1188 //
1189 // This is a rough metric for "fat" methods, compared before inlining
1190 // with InlineSmallCode.  The CodeBlob::code_size accessor includes
1191 // junk like exception handler, stubs, and constant table, which are
1192 // not highly relevant to an inlined method.  So we use the more
1193 // specific accessor nmethod::insts_size.
1194 int ciMethod::instructions_size() {
1195   if (_instructions_size == -1) {
1196     GUARDED_VM_ENTRY(
1197                      CompiledMethod* code = get_Method()->code();
1198                      if (code != NULL && (code->comp_level() == CompLevel_full_optimization)) {
1199                        _instructions_size = code->insts_end() - code->verified_entry_point();
1200                      } else {
1201                        _instructions_size = 0;
1202                      }
1203                      );
1204   }
1205   return _instructions_size;
1206 }
1207 
1208 // ------------------------------------------------------------------
1209 // ciMethod::log_nmethod_identity
1210 void ciMethod::log_nmethod_identity(xmlStream* log) {
1211   GUARDED_VM_ENTRY(
1212     CompiledMethod* code = get_Method()->code();
1213     if (code != NULL) {
1214       code->log_identity(log);
1215     }
1216   )
1217 }
1218 
1219 // ------------------------------------------------------------------
1220 // ciMethod::is_not_reached
1221 bool ciMethod::is_not_reached(int bci) {
1222   check_is_loaded();
1223   VM_ENTRY_MARK;
1224   return Interpreter::is_not_reached(
1225                methodHandle(THREAD, get_Method()), bci);
1226 }
1227 
1228 // ------------------------------------------------------------------
1229 // ciMethod::was_never_executed
1230 bool ciMethod::was_executed_more_than(int times) {
1231   VM_ENTRY_MARK;
1232   return get_Method()->was_executed_more_than(times);
1233 }
1234 
1235 // ------------------------------------------------------------------
1236 // ciMethod::has_unloaded_classes_in_signature
1237 bool ciMethod::has_unloaded_classes_in_signature() {
1238   VM_ENTRY_MARK;
1239   {
1240     EXCEPTION_MARK;
1241     methodHandle m(THREAD, get_Method());
1242     bool has_unloaded = Method::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD);
1243     if( HAS_PENDING_EXCEPTION ) {
1244       CLEAR_PENDING_EXCEPTION;
1245       return true;     // Declare that we may have unloaded classes
1246     }
1247     return has_unloaded;
1248   }
1249 }
1250 
1251 // ------------------------------------------------------------------
1252 // ciMethod::is_klass_loaded
1253 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const {
1254   VM_ENTRY_MARK;
1255   return get_Method()->is_klass_loaded(refinfo_index, must_be_resolved);
1256 }
1257 
1258 // ------------------------------------------------------------------
1259 // ciMethod::check_call
1260 bool ciMethod::check_call(int refinfo_index, bool is_static) const {
1261   // This method is used only in C2 from InlineTree::ok_to_inline,
1262   // and is only used under -Xcomp.
1263   // It appears to fail when applied to an invokeinterface call site.
1264   // FIXME: Remove this method and resolve_method_statically; refactor to use the other LinkResolver entry points.
1265   VM_ENTRY_MARK;
1266   {
1267     EXCEPTION_MARK;
1268     HandleMark hm(THREAD);
1269     constantPoolHandle pool (THREAD, get_Method()->constants());
1270     Bytecodes::Code code = (is_static ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual);
1271     methodHandle spec_method = LinkResolver::resolve_method_statically(code, pool, refinfo_index, THREAD);
1272     if (HAS_PENDING_EXCEPTION) {
1273       CLEAR_PENDING_EXCEPTION;
1274       return false;
1275     } else {
1276       return (spec_method->is_static() == is_static);
1277     }
1278   }
1279   return false;
1280 }
1281 
1282 // ------------------------------------------------------------------
1283 // ciMethod::profile_aging
1284 //
1285 // Should the method be compiled with an age counter?
1286 bool ciMethod::profile_aging() const {
1287   return UseCodeAging && (!MethodCounters::is_nmethod_hot(nmethod_age()) &&
1288                           !MethodCounters::is_nmethod_age_unset(nmethod_age()));
1289 }
1290 // ------------------------------------------------------------------
1291 // ciMethod::print_codes
1292 //
1293 // Print the bytecodes for this method.
1294 void ciMethod::print_codes_on(outputStream* st) {
1295   check_is_loaded();
1296   GUARDED_VM_ENTRY(get_Method()->print_codes_on(st);)
1297 }
1298 
1299 
1300 #define FETCH_FLAG_FROM_VM(flag_accessor) { \
1301   check_is_loaded(); \
1302   VM_ENTRY_MARK; \
1303   return get_Method()->flag_accessor(); \
1304 }
1305 
1306 bool ciMethod::is_empty_method() const {         FETCH_FLAG_FROM_VM(is_empty_method); }
1307 bool ciMethod::is_vanilla_constructor() const {  FETCH_FLAG_FROM_VM(is_vanilla_constructor); }
1308 bool ciMethod::has_loops      () const {         FETCH_FLAG_FROM_VM(has_loops); }
1309 bool ciMethod::has_jsrs       () const {         FETCH_FLAG_FROM_VM(has_jsrs);  }
1310 bool ciMethod::is_getter      () const {         FETCH_FLAG_FROM_VM(is_getter); }
1311 bool ciMethod::is_setter      () const {         FETCH_FLAG_FROM_VM(is_setter); }
1312 bool ciMethod::is_accessor    () const {         FETCH_FLAG_FROM_VM(is_accessor); }
1313 bool ciMethod::is_initializer () const {         FETCH_FLAG_FROM_VM(is_initializer); }
1314 
1315 bool ciMethod::is_boxing_method() const {
1316   if (holder()->is_box_klass()) {
1317     switch (intrinsic_id()) {
1318       case vmIntrinsics::_Boolean_valueOf:
1319       case vmIntrinsics::_Byte_valueOf:
1320       case vmIntrinsics::_Character_valueOf:
1321       case vmIntrinsics::_Short_valueOf:
1322       case vmIntrinsics::_Integer_valueOf:
1323       case vmIntrinsics::_Long_valueOf:
1324       case vmIntrinsics::_Float_valueOf:
1325       case vmIntrinsics::_Double_valueOf:
1326         return true;
1327       default:
1328         return false;
1329     }
1330   }
1331   return false;
1332 }
1333 
1334 bool ciMethod::is_unboxing_method() const {
1335   if (holder()->is_box_klass()) {
1336     switch (intrinsic_id()) {
1337       case vmIntrinsics::_booleanValue:
1338       case vmIntrinsics::_byteValue:
1339       case vmIntrinsics::_charValue:
1340       case vmIntrinsics::_shortValue:
1341       case vmIntrinsics::_intValue:
1342       case vmIntrinsics::_longValue:
1343       case vmIntrinsics::_floatValue:
1344       case vmIntrinsics::_doubleValue:
1345         return true;
1346       default:
1347         return false;
1348     }
1349   }
1350   return false;
1351 }
1352 
1353 BCEscapeAnalyzer  *ciMethod::get_bcea() {
1354 #ifdef COMPILER2
1355   if (_bcea == NULL) {
1356     _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL);
1357   }
1358   return _bcea;
1359 #else // COMPILER2
1360   ShouldNotReachHere();
1361   return NULL;
1362 #endif // COMPILER2
1363 }
1364 
1365 ciMethodBlocks  *ciMethod::get_method_blocks() {
1366   Arena *arena = CURRENT_ENV->arena();
1367   if (_method_blocks == NULL) {
1368     _method_blocks = new (arena) ciMethodBlocks(arena, this);
1369   }
1370   return _method_blocks;
1371 }
1372 
1373 #undef FETCH_FLAG_FROM_VM
1374 
1375 void ciMethod::dump_name_as_ascii(outputStream* st) {
1376   Method* method = get_Method();
1377   st->print("%s %s %s",
1378             method->klass_name()->as_quoted_ascii(),
1379             method->name()->as_quoted_ascii(),
1380             method->signature()->as_quoted_ascii());
1381 }
1382 
1383 void ciMethod::dump_replay_data(outputStream* st) {
1384   ResourceMark rm;
1385   Method* method = get_Method();
1386   MethodCounters* mcs = method->method_counters();
1387   st->print("ciMethod ");
1388   dump_name_as_ascii(st);
1389   st->print_cr(" %d %d %d %d %d",
1390                mcs == NULL ? 0 : mcs->invocation_counter()->raw_counter(),
1391                mcs == NULL ? 0 : mcs->backedge_counter()->raw_counter(),
1392                interpreter_invocation_count(),
1393                interpreter_throwout_count(),
1394                _instructions_size);
1395 }
1396 
1397 // ------------------------------------------------------------------
1398 // ciMethod::print_codes
1399 //
1400 // Print a range of the bytecodes for this method.
1401 void ciMethod::print_codes_on(int from, int to, outputStream* st) {
1402   check_is_loaded();
1403   GUARDED_VM_ENTRY(get_Method()->print_codes_on(from, to, st);)
1404 }
1405 
1406 // ------------------------------------------------------------------
1407 // ciMethod::print_name
1408 //
1409 // Print the name of this method, including signature and some flags.
1410 void ciMethod::print_name(outputStream* st) {
1411   check_is_loaded();
1412   GUARDED_VM_ENTRY(get_Method()->print_name(st);)
1413 }
1414 
1415 // ------------------------------------------------------------------
1416 // ciMethod::print_short_name
1417 //
1418 // Print the name of this method, without signature.
1419 void ciMethod::print_short_name(outputStream* st) {
1420   if (is_loaded()) {
1421     GUARDED_VM_ENTRY(get_Method()->print_short_name(st););
1422   } else {
1423     // Fall back if method is not loaded.
1424     holder()->print_name_on(st);
1425     st->print("::");
1426     name()->print_symbol_on(st);
1427     if (WizardMode)
1428       signature()->as_symbol()->print_symbol_on(st);
1429   }
1430 }
1431 
1432 // ------------------------------------------------------------------
1433 // ciMethod::print_impl
1434 //
1435 // Implementation of the print method.
1436 void ciMethod::print_impl(outputStream* st) {
1437   ciMetadata::print_impl(st);
1438   st->print(" name=");
1439   name()->print_symbol_on(st);
1440   st->print(" holder=");
1441   holder()->print_name_on(st);
1442   st->print(" signature=");
1443   signature()->as_symbol()->print_symbol_on(st);
1444   if (is_loaded()) {
1445     st->print(" loaded=true");
1446     st->print(" arg_size=%d", arg_size());
1447     st->print(" flags=");
1448     flags().print_member_flags(st);
1449   } else {
1450     st->print(" loaded=false");
1451   }
1452 }
1453 
1454 // ------------------------------------------------------------------
1455 
1456 static BasicType erase_to_word_type(BasicType bt) {
1457   if (is_subword_type(bt)) return T_INT;
1458   if (bt == T_ARRAY)       return T_OBJECT;
1459   return bt;
1460 }
1461 
1462 static bool basic_types_match(ciType* t1, ciType* t2) {
1463   if (t1 == t2)  return true;
1464   return erase_to_word_type(t1->basic_type()) == erase_to_word_type(t2->basic_type());
1465 }
1466 
1467 bool ciMethod::is_consistent_info(ciMethod* declared_method, ciMethod* resolved_method) {
1468   bool invoke_through_mh_intrinsic = declared_method->is_method_handle_intrinsic() &&
1469                                   !resolved_method->is_method_handle_intrinsic();
1470 
1471   if (!invoke_through_mh_intrinsic) {
1472     // Method name & descriptor should stay the same.
1473     // Signatures may reference unloaded types and thus they may be not strictly equal.
1474     ciSymbol* declared_signature = declared_method->signature()->as_symbol();
1475     ciSymbol* resolved_signature = resolved_method->signature()->as_symbol();
1476 
1477     return (declared_method->name()->equals(resolved_method->name())) &&
1478            (declared_signature->equals(resolved_signature));
1479   }
1480 
1481   ciMethod* linker = declared_method;
1482   ciMethod* target = resolved_method;
1483   // Linkers have appendix argument which is not passed to callee.
1484   int has_appendix = MethodHandles::has_member_arg(linker->intrinsic_id()) ? 1 : 0;
1485   if (linker->arg_size() != (target->arg_size() + has_appendix)) {
1486     return false; // argument slot count mismatch
1487   }
1488 
1489   ciSignature* linker_sig = linker->signature();
1490   ciSignature* target_sig = target->signature();
1491 
1492   if (linker_sig->count() + (linker->is_static() ? 0 : 1) !=
1493       target_sig->count() + (target->is_static() ? 0 : 1) + has_appendix) {
1494     return false; // argument count mismatch
1495   }
1496 
1497   int sbase = 0, rbase = 0;
1498   switch (linker->intrinsic_id()) {
1499     case vmIntrinsics::_linkToVirtual:
1500     case vmIntrinsics::_linkToInterface:
1501     case vmIntrinsics::_linkToSpecial: {
1502       if (target->is_static()) {
1503         return false;
1504       }
1505       if (linker_sig->type_at(0)->is_primitive_type()) {
1506         return false;  // receiver should be an oop
1507       }
1508       sbase = 1; // skip receiver
1509       break;
1510     }
1511     case vmIntrinsics::_linkToStatic: {
1512       if (!target->is_static()) {
1513         return false;
1514       }
1515       break;
1516     }
1517     case vmIntrinsics::_invokeBasic: {
1518       if (target->is_static()) {
1519         if (target_sig->type_at(0)->is_primitive_type()) {
1520           return false; // receiver should be an oop
1521         }
1522         rbase = 1; // skip receiver
1523       }
1524       break;
1525     }
1526     default:
1527       break;
1528   }
1529   assert(target_sig->count() - rbase == linker_sig->count() - sbase - has_appendix, "argument count mismatch");
1530   int arg_count = target_sig->count() - rbase;
1531   for (int i = 0; i < arg_count; i++) {
1532     if (!basic_types_match(linker_sig->type_at(sbase + i), target_sig->type_at(rbase + i))) {
1533       return false;
1534     }
1535   }
1536   // Only check the return type if the symbolic info has non-void return type.
1537   // I.e. the return value of the resolved method can be dropped.
1538   if (!linker->return_type()->is_void() &&
1539       !basic_types_match(linker->return_type(), target->return_type())) {
1540     return false;
1541   }
1542   return true; // no mismatch found
1543 }
1544 
1545 // ------------------------------------------------------------------