1 /* 2 * Copyright (c) 1999, 2010, 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 "incls/_precompiled.incl" 26 #include "incls/_ciMethod.cpp.incl" 27 28 // ciMethod 29 // 30 // This class represents a methodOop in the HotSpot virtual 31 // machine. 32 33 34 // ------------------------------------------------------------------ 35 // ciMethod::ciMethod 36 // 37 // Loaded method. 38 ciMethod::ciMethod(methodHandle h_m) : ciObject(h_m) { 39 assert(h_m() != NULL, "no null method"); 40 41 // These fields are always filled in in loaded methods. 42 _flags = ciFlags(h_m()->access_flags()); 43 44 // Easy to compute, so fill them in now. 45 _max_stack = h_m()->max_stack(); 46 _max_locals = h_m()->max_locals(); 47 _code_size = h_m()->code_size(); 48 _intrinsic_id = h_m()->intrinsic_id(); 49 _handler_count = h_m()->exception_table()->length() / 4; 50 _uses_monitors = h_m()->access_flags().has_monitor_bytecodes(); 51 _balanced_monitors = !_uses_monitors || h_m()->access_flags().is_monitor_matching(); 52 _is_compilable = !h_m()->is_not_compilable(); 53 // Lazy fields, filled in on demand. Require allocation. 54 _code = NULL; 55 _exception_handlers = NULL; 56 _liveness = NULL; 57 _bcea = NULL; 58 _method_blocks = NULL; 59 #if defined(COMPILER2) || defined(SHARK) 60 _flow = NULL; 61 #endif // COMPILER2 || SHARK 62 63 ciEnv *env = CURRENT_ENV; 64 if (env->jvmti_can_hotswap_or_post_breakpoint() && _is_compilable) { 65 // 6328518 check hotswap conditions under the right lock. 66 MutexLocker locker(Compile_lock); 67 if (Dependencies::check_evol_method(h_m()) != NULL) { 68 _is_compilable = false; 69 } 70 } else { 71 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 72 } 73 74 if (instanceKlass::cast(h_m()->method_holder())->is_linked()) { 75 _can_be_statically_bound = h_m()->can_be_statically_bound(); 76 } else { 77 // Have to use a conservative value in this case. 78 _can_be_statically_bound = false; 79 } 80 81 // Adjust the definition of this condition to be more useful: 82 // %%% take these conditions into account in vtable generation 83 if (!_can_be_statically_bound && h_m()->is_private()) 84 _can_be_statically_bound = true; 85 if (_can_be_statically_bound && h_m()->is_abstract()) 86 _can_be_statically_bound = false; 87 88 // generating _signature may allow GC and therefore move m. 89 // These fields are always filled in. 90 _name = env->get_object(h_m()->name())->as_symbol(); 91 _holder = env->get_object(h_m()->method_holder())->as_instance_klass(); 92 ciSymbol* sig_symbol = env->get_object(h_m()->signature())->as_symbol(); 93 _signature = new (env->arena()) ciSignature(_holder, sig_symbol); 94 _method_data = NULL; 95 // Take a snapshot of these values, so they will be commensurate with the MDO. 96 if (ProfileInterpreter) { 97 int invcnt = h_m()->interpreter_invocation_count(); 98 // if the value overflowed report it as max int 99 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ; 100 _interpreter_throwout_count = h_m()->interpreter_throwout_count(); 101 } else { 102 _interpreter_invocation_count = 0; 103 _interpreter_throwout_count = 0; 104 } 105 if (_interpreter_invocation_count == 0) 106 _interpreter_invocation_count = 1; 107 } 108 109 110 // ------------------------------------------------------------------ 111 // ciMethod::ciMethod 112 // 113 // Unloaded method. 114 ciMethod::ciMethod(ciInstanceKlass* holder, 115 ciSymbol* name, 116 ciSymbol* signature) : ciObject(ciMethodKlass::make()) { 117 // These fields are always filled in. 118 _name = name; 119 _holder = holder; 120 _signature = new (CURRENT_ENV->arena()) ciSignature(_holder, signature); 121 _intrinsic_id = vmIntrinsics::_none; 122 _liveness = NULL; 123 _can_be_statically_bound = false; 124 _bcea = NULL; 125 _method_blocks = NULL; 126 _method_data = NULL; 127 #if defined(COMPILER2) || defined(SHARK) 128 _flow = NULL; 129 #endif // COMPILER2 || SHARK 130 } 131 132 133 // ------------------------------------------------------------------ 134 // ciMethod::load_code 135 // 136 // Load the bytecodes and exception handler table for this method. 137 void ciMethod::load_code() { 138 VM_ENTRY_MARK; 139 assert(is_loaded(), "only loaded methods have code"); 140 141 methodOop me = get_methodOop(); 142 Arena* arena = CURRENT_THREAD_ENV->arena(); 143 144 // Load the bytecodes. 145 _code = (address)arena->Amalloc(code_size()); 146 memcpy(_code, me->code_base(), code_size()); 147 148 // Revert any breakpoint bytecodes in ci's copy 149 if (me->number_of_breakpoints() > 0) { 150 BreakpointInfo* bp = instanceKlass::cast(me->method_holder())->breakpoints(); 151 for (; bp != NULL; bp = bp->next()) { 152 if (bp->match(me)) { 153 code_at_put(bp->bci(), bp->orig_bytecode()); 154 } 155 } 156 } 157 158 // And load the exception table. 159 typeArrayOop exc_table = me->exception_table(); 160 161 // Allocate one extra spot in our list of exceptions. This 162 // last entry will be used to represent the possibility that 163 // an exception escapes the method. See ciExceptionHandlerStream 164 // for details. 165 _exception_handlers = 166 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*) 167 * (_handler_count + 1)); 168 if (_handler_count > 0) { 169 for (int i=0; i<_handler_count; i++) { 170 int base = i*4; 171 _exception_handlers[i] = new (arena) ciExceptionHandler( 172 holder(), 173 /* start */ exc_table->int_at(base), 174 /* limit */ exc_table->int_at(base+1), 175 /* goto pc */ exc_table->int_at(base+2), 176 /* cp index */ exc_table->int_at(base+3)); 177 } 178 } 179 180 // Put an entry at the end of our list to represent the possibility 181 // of exceptional exit. 182 _exception_handlers[_handler_count] = 183 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0); 184 185 if (CIPrintMethodCodes) { 186 print_codes(); 187 } 188 } 189 190 191 // ------------------------------------------------------------------ 192 // ciMethod::has_linenumber_table 193 // 194 // length unknown until decompression 195 bool ciMethod::has_linenumber_table() const { 196 check_is_loaded(); 197 VM_ENTRY_MARK; 198 return get_methodOop()->has_linenumber_table(); 199 } 200 201 202 // ------------------------------------------------------------------ 203 // ciMethod::compressed_linenumber_table 204 u_char* ciMethod::compressed_linenumber_table() const { 205 check_is_loaded(); 206 VM_ENTRY_MARK; 207 return get_methodOop()->compressed_linenumber_table(); 208 } 209 210 211 // ------------------------------------------------------------------ 212 // ciMethod::line_number_from_bci 213 int ciMethod::line_number_from_bci(int bci) const { 214 check_is_loaded(); 215 VM_ENTRY_MARK; 216 return get_methodOop()->line_number_from_bci(bci); 217 } 218 219 220 // ------------------------------------------------------------------ 221 // ciMethod::vtable_index 222 // 223 // Get the position of this method's entry in the vtable, if any. 224 int ciMethod::vtable_index() { 225 check_is_loaded(); 226 assert(holder()->is_linked(), "must be linked"); 227 VM_ENTRY_MARK; 228 return get_methodOop()->vtable_index(); 229 } 230 231 232 #ifdef SHARK 233 // ------------------------------------------------------------------ 234 // ciMethod::itable_index 235 // 236 // Get the position of this method's entry in the itable, if any. 237 int ciMethod::itable_index() { 238 check_is_loaded(); 239 assert(holder()->is_linked(), "must be linked"); 240 VM_ENTRY_MARK; 241 return klassItable::compute_itable_index(get_methodOop()); 242 } 243 #endif // SHARK 244 245 246 // ------------------------------------------------------------------ 247 // ciMethod::native_entry 248 // 249 // Get the address of this method's native code, if any. 250 address ciMethod::native_entry() { 251 check_is_loaded(); 252 assert(flags().is_native(), "must be native method"); 253 VM_ENTRY_MARK; 254 methodOop method = get_methodOop(); 255 address entry = method->native_function(); 256 assert(entry != NULL, "must be valid entry point"); 257 return entry; 258 } 259 260 261 // ------------------------------------------------------------------ 262 // ciMethod::interpreter_entry 263 // 264 // Get the entry point for running this method in the interpreter. 265 address ciMethod::interpreter_entry() { 266 check_is_loaded(); 267 VM_ENTRY_MARK; 268 methodHandle mh(THREAD, get_methodOop()); 269 return Interpreter::entry_for_method(mh); 270 } 271 272 273 // ------------------------------------------------------------------ 274 // ciMethod::uses_balanced_monitors 275 // 276 // Does this method use monitors in a strict stack-disciplined manner? 277 bool ciMethod::has_balanced_monitors() { 278 check_is_loaded(); 279 if (_balanced_monitors) return true; 280 281 // Analyze the method to see if monitors are used properly. 282 VM_ENTRY_MARK; 283 methodHandle method(THREAD, get_methodOop()); 284 assert(method->has_monitor_bytecodes(), "should have checked this"); 285 286 // Check to see if a previous compilation computed the 287 // monitor-matching analysis. 288 if (method->guaranteed_monitor_matching()) { 289 _balanced_monitors = true; 290 return true; 291 } 292 293 { 294 EXCEPTION_MARK; 295 ResourceMark rm(THREAD); 296 GeneratePairingInfo gpi(method); 297 gpi.compute_map(CATCH); 298 if (!gpi.monitor_safe()) { 299 return false; 300 } 301 method->set_guaranteed_monitor_matching(); 302 _balanced_monitors = true; 303 } 304 return true; 305 } 306 307 308 // ------------------------------------------------------------------ 309 // ciMethod::get_flow_analysis 310 ciTypeFlow* ciMethod::get_flow_analysis() { 311 #if defined(COMPILER2) || defined(SHARK) 312 if (_flow == NULL) { 313 ciEnv* env = CURRENT_ENV; 314 _flow = new (env->arena()) ciTypeFlow(env, this); 315 _flow->do_flow(); 316 } 317 return _flow; 318 #else // COMPILER2 || SHARK 319 ShouldNotReachHere(); 320 return NULL; 321 #endif // COMPILER2 || SHARK 322 } 323 324 325 // ------------------------------------------------------------------ 326 // ciMethod::get_osr_flow_analysis 327 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) { 328 #if defined(COMPILER2) || defined(SHARK) 329 // OSR entry points are always place after a call bytecode of some sort 330 assert(osr_bci >= 0, "must supply valid OSR entry point"); 331 ciEnv* env = CURRENT_ENV; 332 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci); 333 flow->do_flow(); 334 return flow; 335 #else // COMPILER2 || SHARK 336 ShouldNotReachHere(); 337 return NULL; 338 #endif // COMPILER2 || SHARK 339 } 340 341 // ------------------------------------------------------------------ 342 // ciMethod::raw_liveness_at_bci 343 // 344 // Which local variables are live at a specific bci? 345 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) { 346 check_is_loaded(); 347 if (_liveness == NULL) { 348 // Create the liveness analyzer. 349 Arena* arena = CURRENT_ENV->arena(); 350 _liveness = new (arena) MethodLiveness(arena, this); 351 _liveness->compute_liveness(); 352 } 353 return _liveness->get_liveness_at(bci); 354 } 355 356 // ------------------------------------------------------------------ 357 // ciMethod::liveness_at_bci 358 // 359 // Which local variables are live at a specific bci? When debugging 360 // will return true for all locals in some cases to improve debug 361 // information. 362 MethodLivenessResult ciMethod::liveness_at_bci(int bci) { 363 MethodLivenessResult result = raw_liveness_at_bci(bci); 364 if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) { 365 // Keep all locals live for the user's edification and amusement. 366 result.at_put_range(0, result.size(), true); 367 } 368 return result; 369 } 370 371 // ciMethod::live_local_oops_at_bci 372 // 373 // find all the live oops in the locals array for a particular bci 374 // Compute what the interpreter believes by using the interpreter 375 // oopmap generator. This is used as a double check during osr to 376 // guard against conservative result from MethodLiveness making us 377 // think a dead oop is live. MethodLiveness is conservative in the 378 // sense that it may consider locals to be live which cannot be live, 379 // like in the case where a local could contain an oop or a primitive 380 // along different paths. In that case the local must be dead when 381 // those paths merge. Since the interpreter's viewpoint is used when 382 // gc'ing an interpreter frame we need to use its viewpoint during 383 // OSR when loading the locals. 384 385 BitMap ciMethod::live_local_oops_at_bci(int bci) { 386 VM_ENTRY_MARK; 387 InterpreterOopMap mask; 388 OopMapCache::compute_one_oop_map(get_methodOop(), bci, &mask); 389 int mask_size = max_locals(); 390 BitMap result(mask_size); 391 result.clear(); 392 int i; 393 for (i = 0; i < mask_size ; i++ ) { 394 if (mask.is_oop(i)) result.set_bit(i); 395 } 396 return result; 397 } 398 399 400 #ifdef COMPILER1 401 // ------------------------------------------------------------------ 402 // ciMethod::bci_block_start 403 // 404 // Marks all bcis where a new basic block starts 405 const BitMap ciMethod::bci_block_start() { 406 check_is_loaded(); 407 if (_liveness == NULL) { 408 // Create the liveness analyzer. 409 Arena* arena = CURRENT_ENV->arena(); 410 _liveness = new (arena) MethodLiveness(arena, this); 411 _liveness->compute_liveness(); 412 } 413 414 return _liveness->get_bci_block_start(); 415 } 416 #endif // COMPILER1 417 418 419 // ------------------------------------------------------------------ 420 // ciMethod::call_profile_at_bci 421 // 422 // Get the ciCallProfile for the invocation of this method. 423 // Also reports receiver types for non-call type checks (if TypeProfileCasts). 424 ciCallProfile ciMethod::call_profile_at_bci(int bci) { 425 ResourceMark rm; 426 ciCallProfile result; 427 if (method_data() != NULL && method_data()->is_mature()) { 428 ciProfileData* data = method_data()->bci_to_data(bci); 429 if (data != NULL && data->is_CounterData()) { 430 // Every profiled call site has a counter. 431 int count = data->as_CounterData()->count(); 432 433 if (!data->is_ReceiverTypeData()) { 434 result._receiver_count[0] = 0; // that's a definite zero 435 } else { // ReceiverTypeData is a subclass of CounterData 436 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData(); 437 // In addition, virtual call sites have receiver type information 438 int receivers_count_total = 0; 439 int morphism = 0; 440 for (uint i = 0; i < call->row_limit(); i++) { 441 ciKlass* receiver = call->receiver(i); 442 if (receiver == NULL) continue; 443 morphism += 1; 444 int rcount = call->receiver_count(i); 445 if (rcount == 0) rcount = 1; // Should be valid value 446 receivers_count_total += rcount; 447 // Add the receiver to result data. 448 result.add_receiver(receiver, rcount); 449 // If we extend profiling to record methods, 450 // we will set result._method also. 451 } 452 // Determine call site's morphism. 453 // The call site count is 0 with known morphism (onlt 1 or 2 receivers) 454 // or < 0 in the case of a type check failured for checkcast, aastore, instanceof. 455 // The call site count is > 0 in the case of a polymorphic virtual call. 456 if (morphism > 0 && morphism == result._limit) { 457 // The morphism <= MorphismLimit. 458 if ((morphism < ciCallProfile::MorphismLimit) || 459 (morphism == ciCallProfile::MorphismLimit && count == 0)) { 460 #ifdef ASSERT 461 if (count > 0) { 462 this->print_short_name(tty); 463 tty->print_cr(" @ bci:%d", bci); 464 this->print_codes(); 465 assert(false, "this call site should not be polymorphic"); 466 } 467 #endif 468 result._morphism = morphism; 469 } 470 } 471 // Make the count consistent if this is a call profile. If count is 472 // zero or less, presume that this is a typecheck profile and 473 // do nothing. Otherwise, increase count to be the sum of all 474 // receiver's counts. 475 if (count >= 0) { 476 count += receivers_count_total; 477 } 478 } 479 result._count = count; 480 } 481 } 482 return result; 483 } 484 485 // ------------------------------------------------------------------ 486 // Add new receiver and sort data by receiver's profile count. 487 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) { 488 // Add new receiver and sort data by receiver's counts when we have space 489 // for it otherwise replace the less called receiver (less called receiver 490 // is placed to the last array element which is not used). 491 // First array's element contains most called receiver. 492 int i = _limit; 493 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) { 494 _receiver[i] = _receiver[i-1]; 495 _receiver_count[i] = _receiver_count[i-1]; 496 } 497 _receiver[i] = receiver; 498 _receiver_count[i] = receiver_count; 499 if (_limit < MorphismLimit) _limit++; 500 } 501 502 // ------------------------------------------------------------------ 503 // ciMethod::find_monomorphic_target 504 // 505 // Given a certain calling environment, find the monomorphic target 506 // for the call. Return NULL if the call is not monomorphic in 507 // its calling environment, or if there are only abstract methods. 508 // The returned method is never abstract. 509 // Note: If caller uses a non-null result, it must inform dependencies 510 // via assert_unique_concrete_method or assert_leaf_type. 511 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller, 512 ciInstanceKlass* callee_holder, 513 ciInstanceKlass* actual_recv) { 514 check_is_loaded(); 515 516 if (actual_recv->is_interface()) { 517 // %%% We cannot trust interface types, yet. See bug 6312651. 518 return NULL; 519 } 520 521 ciMethod* root_m = resolve_invoke(caller, actual_recv); 522 if (root_m == NULL) { 523 // Something went wrong looking up the actual receiver method. 524 return NULL; 525 } 526 assert(!root_m->is_abstract(), "resolve_invoke promise"); 527 528 // Make certain quick checks even if UseCHA is false. 529 530 // Is it private or final? 531 if (root_m->can_be_statically_bound()) { 532 return root_m; 533 } 534 535 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) { 536 // Easy case. There is no other place to put a method, so don't bother 537 // to go through the VM_ENTRY_MARK and all the rest. 538 return root_m; 539 } 540 541 // Array methods (clone, hashCode, etc.) are always statically bound. 542 // If we were to see an array type here, we'd return root_m. 543 // However, this method processes only ciInstanceKlasses. (See 4962591.) 544 // The inline_native_clone intrinsic narrows Object to T[] properly, 545 // so there is no need to do the same job here. 546 547 if (!UseCHA) return NULL; 548 549 VM_ENTRY_MARK; 550 551 methodHandle target; 552 { 553 MutexLocker locker(Compile_lock); 554 klassOop context = actual_recv->get_klassOop(); 555 target = Dependencies::find_unique_concrete_method(context, 556 root_m->get_methodOop()); 557 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods. 558 } 559 560 #ifndef PRODUCT 561 if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) { 562 tty->print("found a non-root unique target method"); 563 tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name()); 564 tty->print(" method = "); 565 target->print_short_name(tty); 566 tty->cr(); 567 } 568 #endif //PRODUCT 569 570 if (target() == NULL) { 571 return NULL; 572 } 573 if (target() == root_m->get_methodOop()) { 574 return root_m; 575 } 576 if (!root_m->is_public() && 577 !root_m->is_protected()) { 578 // If we are going to reason about inheritance, it's easiest 579 // if the method in question is public, protected, or private. 580 // If the answer is not root_m, it is conservatively correct 581 // to return NULL, even if the CHA encountered irrelevant 582 // methods in other packages. 583 // %%% TO DO: Work out logic for package-private methods 584 // with the same name but different vtable indexes. 585 return NULL; 586 } 587 return CURRENT_THREAD_ENV->get_object(target())->as_method(); 588 } 589 590 // ------------------------------------------------------------------ 591 // ciMethod::resolve_invoke 592 // 593 // Given a known receiver klass, find the target for the call. 594 // Return NULL if the call has no target or the target is abstract. 595 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) { 596 check_is_loaded(); 597 VM_ENTRY_MARK; 598 599 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 600 KlassHandle h_recv (THREAD, exact_receiver->get_klassOop()); 601 KlassHandle h_resolved (THREAD, holder()->get_klassOop()); 602 symbolHandle h_name (THREAD, name()->get_symbolOop()); 603 symbolHandle h_signature (THREAD, signature()->get_symbolOop()); 604 605 methodHandle m; 606 // Only do exact lookup if receiver klass has been linked. Otherwise, 607 // the vtable has not been setup, and the LinkResolver will fail. 608 if (h_recv->oop_is_javaArray() 609 || 610 instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) { 611 if (holder()->is_interface()) { 612 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 613 } else { 614 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 615 } 616 } 617 618 if (m.is_null()) { 619 // Return NULL only if there was a problem with lookup (uninitialized class, etc.) 620 return NULL; 621 } 622 623 ciMethod* result = this; 624 if (m() != get_methodOop()) { 625 result = CURRENT_THREAD_ENV->get_object(m())->as_method(); 626 } 627 628 // Don't return abstract methods because they aren't 629 // optimizable or interesting. 630 if (result->is_abstract()) { 631 return NULL; 632 } else { 633 return result; 634 } 635 } 636 637 // ------------------------------------------------------------------ 638 // ciMethod::resolve_vtable_index 639 // 640 // Given a known receiver klass, find the vtable index for the call. 641 // Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown. 642 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) { 643 check_is_loaded(); 644 645 int vtable_index = methodOopDesc::invalid_vtable_index; 646 // Only do lookup if receiver klass has been linked. Otherwise, 647 // the vtable has not been setup, and the LinkResolver will fail. 648 if (!receiver->is_interface() 649 && (!receiver->is_instance_klass() || 650 receiver->as_instance_klass()->is_linked())) { 651 VM_ENTRY_MARK; 652 653 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 654 KlassHandle h_recv (THREAD, receiver->get_klassOop()); 655 symbolHandle h_name (THREAD, name()->get_symbolOop()); 656 symbolHandle h_signature (THREAD, signature()->get_symbolOop()); 657 658 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass); 659 if (vtable_index == methodOopDesc::nonvirtual_vtable_index) { 660 // A statically bound method. Return "no such index". 661 vtable_index = methodOopDesc::invalid_vtable_index; 662 } 663 } 664 665 return vtable_index; 666 } 667 668 // ------------------------------------------------------------------ 669 // ciMethod::interpreter_call_site_count 670 int ciMethod::interpreter_call_site_count(int bci) { 671 if (method_data() != NULL) { 672 ResourceMark rm; 673 ciProfileData* data = method_data()->bci_to_data(bci); 674 if (data != NULL && data->is_CounterData()) { 675 return scale_count(data->as_CounterData()->count()); 676 } 677 } 678 return -1; // unknown 679 } 680 681 // ------------------------------------------------------------------ 682 // Adjust a CounterData count to be commensurate with 683 // interpreter_invocation_count. If the MDO exists for 684 // only 25% of the time the method exists, then the 685 // counts in the MDO should be scaled by 4X, so that 686 // they can be usefully and stably compared against the 687 // invocation counts in methods. 688 int ciMethod::scale_count(int count, float prof_factor) { 689 if (count > 0 && method_data() != NULL) { 690 int current_mileage = method_data()->current_mileage(); 691 int creation_mileage = method_data()->creation_mileage(); 692 int counter_life = current_mileage - creation_mileage; 693 int method_life = interpreter_invocation_count(); 694 // counter_life due to backedge_counter could be > method_life 695 if (counter_life > method_life) 696 counter_life = method_life; 697 if (0 < counter_life && counter_life <= method_life) { 698 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5); 699 count = (count > 0) ? count : 1; 700 } 701 } 702 return count; 703 } 704 705 // ------------------------------------------------------------------ 706 // invokedynamic support 707 708 // ------------------------------------------------------------------ 709 // ciMethod::is_method_handle_invoke 710 // 711 // Return true if the method is a MethodHandle target. 712 bool ciMethod::is_method_handle_invoke() const { 713 bool flag = (holder()->name() == ciSymbol::java_dyn_MethodHandle() && 714 methodOopDesc::is_method_handle_invoke_name(name()->sid())); 715 #ifdef ASSERT 716 if (is_loaded()) { 717 bool flag2 = ((flags().as_int() & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS); 718 { 719 VM_ENTRY_MARK; 720 bool flag3 = get_methodOop()->is_method_handle_invoke(); 721 assert(flag2 == flag3, "consistent"); 722 assert(flag == flag3, "consistent"); 723 } 724 } 725 #endif //ASSERT 726 return flag; 727 } 728 729 // ------------------------------------------------------------------ 730 // ciMethod::is_method_handle_adapter 731 // 732 // Return true if the method is a generated MethodHandle adapter. 733 bool ciMethod::is_method_handle_adapter() const { 734 check_is_loaded(); 735 VM_ENTRY_MARK; 736 return get_methodOop()->is_method_handle_adapter(); 737 } 738 739 ciInstance* ciMethod::method_handle_type() { 740 check_is_loaded(); 741 VM_ENTRY_MARK; 742 oop mtype = get_methodOop()->method_handle_type(); 743 return CURRENT_THREAD_ENV->get_object(mtype)->as_instance(); 744 } 745 746 747 // ------------------------------------------------------------------ 748 // ciMethod::build_method_data 749 // 750 // Generate new methodDataOop objects at compile time. 751 void ciMethod::build_method_data(methodHandle h_m) { 752 EXCEPTION_CONTEXT; 753 if (is_native() || is_abstract() || h_m()->is_accessor()) return; 754 if (h_m()->method_data() == NULL) { 755 methodOopDesc::build_interpreter_method_data(h_m, THREAD); 756 if (HAS_PENDING_EXCEPTION) { 757 CLEAR_PENDING_EXCEPTION; 758 } 759 } 760 if (h_m()->method_data() != NULL) { 761 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 762 _method_data->load_data(); 763 } else { 764 _method_data = CURRENT_ENV->get_empty_methodData(); 765 } 766 } 767 768 // public, retroactive version 769 void ciMethod::build_method_data() { 770 if (_method_data == NULL || _method_data->is_empty()) { 771 GUARDED_VM_ENTRY({ 772 build_method_data(get_methodOop()); 773 }); 774 } 775 } 776 777 778 // ------------------------------------------------------------------ 779 // ciMethod::method_data 780 // 781 ciMethodData* ciMethod::method_data() { 782 if (_method_data != NULL) { 783 return _method_data; 784 } 785 VM_ENTRY_MARK; 786 ciEnv* env = CURRENT_ENV; 787 Thread* my_thread = JavaThread::current(); 788 methodHandle h_m(my_thread, get_methodOop()); 789 790 if (Tier1UpdateMethodData && is_tier1_compile(env->comp_level())) { 791 build_method_data(h_m); 792 } 793 794 if (h_m()->method_data() != NULL) { 795 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 796 _method_data->load_data(); 797 } else { 798 _method_data = CURRENT_ENV->get_empty_methodData(); 799 } 800 return _method_data; 801 802 } 803 804 805 // ------------------------------------------------------------------ 806 // ciMethod::will_link 807 // 808 // Will this method link in a specific calling context? 809 bool ciMethod::will_link(ciKlass* accessing_klass, 810 ciKlass* declared_method_holder, 811 Bytecodes::Code bc) { 812 if (!is_loaded()) { 813 // Method lookup failed. 814 return false; 815 } 816 817 // The link checks have been front-loaded into the get_method 818 // call. This method (ciMethod::will_link()) will be removed 819 // in the future. 820 821 return true; 822 } 823 824 // ------------------------------------------------------------------ 825 // ciMethod::should_exclude 826 // 827 // Should this method be excluded from compilation? 828 bool ciMethod::should_exclude() { 829 check_is_loaded(); 830 VM_ENTRY_MARK; 831 methodHandle mh(THREAD, get_methodOop()); 832 bool ignore; 833 return CompilerOracle::should_exclude(mh, ignore); 834 } 835 836 // ------------------------------------------------------------------ 837 // ciMethod::should_inline 838 // 839 // Should this method be inlined during compilation? 840 bool ciMethod::should_inline() { 841 check_is_loaded(); 842 VM_ENTRY_MARK; 843 methodHandle mh(THREAD, get_methodOop()); 844 return CompilerOracle::should_inline(mh); 845 } 846 847 // ------------------------------------------------------------------ 848 // ciMethod::should_not_inline 849 // 850 // Should this method be disallowed from inlining during compilation? 851 bool ciMethod::should_not_inline() { 852 check_is_loaded(); 853 VM_ENTRY_MARK; 854 methodHandle mh(THREAD, get_methodOop()); 855 return CompilerOracle::should_not_inline(mh); 856 } 857 858 // ------------------------------------------------------------------ 859 // ciMethod::should_print_assembly 860 // 861 // Should the compiler print the generated code for this method? 862 bool ciMethod::should_print_assembly() { 863 check_is_loaded(); 864 VM_ENTRY_MARK; 865 methodHandle mh(THREAD, get_methodOop()); 866 return CompilerOracle::should_print(mh); 867 } 868 869 // ------------------------------------------------------------------ 870 // ciMethod::break_at_execute 871 // 872 // Should the compiler insert a breakpoint into the generated code 873 // method? 874 bool ciMethod::break_at_execute() { 875 check_is_loaded(); 876 VM_ENTRY_MARK; 877 methodHandle mh(THREAD, get_methodOop()); 878 return CompilerOracle::should_break_at(mh); 879 } 880 881 // ------------------------------------------------------------------ 882 // ciMethod::has_option 883 // 884 bool ciMethod::has_option(const char* option) { 885 check_is_loaded(); 886 VM_ENTRY_MARK; 887 methodHandle mh(THREAD, get_methodOop()); 888 return CompilerOracle::has_option_string(mh, option); 889 } 890 891 // ------------------------------------------------------------------ 892 // ciMethod::can_be_compiled 893 // 894 // Have previous compilations of this method succeeded? 895 bool ciMethod::can_be_compiled() { 896 check_is_loaded(); 897 return _is_compilable; 898 } 899 900 // ------------------------------------------------------------------ 901 // ciMethod::set_not_compilable 902 // 903 // Tell the VM that this method cannot be compiled at all. 904 void ciMethod::set_not_compilable() { 905 check_is_loaded(); 906 VM_ENTRY_MARK; 907 _is_compilable = false; 908 get_methodOop()->set_not_compilable(); 909 } 910 911 // ------------------------------------------------------------------ 912 // ciMethod::can_be_osr_compiled 913 // 914 // Have previous compilations of this method succeeded? 915 // 916 // Implementation note: the VM does not currently keep track 917 // of failed OSR compilations per bci. The entry_bci parameter 918 // is currently unused. 919 bool ciMethod::can_be_osr_compiled(int entry_bci) { 920 check_is_loaded(); 921 VM_ENTRY_MARK; 922 return !get_methodOop()->access_flags().is_not_osr_compilable(); 923 } 924 925 // ------------------------------------------------------------------ 926 // ciMethod::has_compiled_code 927 bool ciMethod::has_compiled_code() { 928 VM_ENTRY_MARK; 929 return get_methodOop()->code() != NULL; 930 } 931 932 // ------------------------------------------------------------------ 933 // ciMethod::instructions_size 934 // This is a rough metric for "fat" methods, compared 935 // before inlining with InlineSmallCode. 936 // The CodeBlob::instructions_size accessor includes 937 // junk like exception handler, stubs, and constant table, 938 // which are not highly relevant to an inlined method. 939 // So we use the more specific accessor nmethod::code_size. 940 int ciMethod::instructions_size() { 941 GUARDED_VM_ENTRY( 942 nmethod* code = get_methodOop()->code(); 943 // if there's no compiled code or the code was produced by the 944 // tier1 profiler return 0 for the code size. This should 945 // probably be based on the compilation level of the nmethod but 946 // that currently isn't properly recorded. 947 if (code == NULL || 948 (TieredCompilation && code->compiler() != NULL && code->compiler()->is_c1())) { 949 return 0; 950 } 951 return code->code_end() - code->verified_entry_point(); 952 ) 953 } 954 955 // ------------------------------------------------------------------ 956 // ciMethod::log_nmethod_identity 957 void ciMethod::log_nmethod_identity(xmlStream* log) { 958 GUARDED_VM_ENTRY( 959 nmethod* code = get_methodOop()->code(); 960 if (code != NULL) { 961 code->log_identity(log); 962 } 963 ) 964 } 965 966 // ------------------------------------------------------------------ 967 // ciMethod::is_not_reached 968 bool ciMethod::is_not_reached(int bci) { 969 check_is_loaded(); 970 VM_ENTRY_MARK; 971 return Interpreter::is_not_reached( 972 methodHandle(THREAD, get_methodOop()), bci); 973 } 974 975 // ------------------------------------------------------------------ 976 // ciMethod::was_never_executed 977 bool ciMethod::was_executed_more_than(int times) { 978 VM_ENTRY_MARK; 979 return get_methodOop()->was_executed_more_than(times); 980 } 981 982 // ------------------------------------------------------------------ 983 // ciMethod::has_unloaded_classes_in_signature 984 bool ciMethod::has_unloaded_classes_in_signature() { 985 VM_ENTRY_MARK; 986 { 987 EXCEPTION_MARK; 988 methodHandle m(THREAD, get_methodOop()); 989 bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD); 990 if( HAS_PENDING_EXCEPTION ) { 991 CLEAR_PENDING_EXCEPTION; 992 return true; // Declare that we may have unloaded classes 993 } 994 return has_unloaded; 995 } 996 } 997 998 // ------------------------------------------------------------------ 999 // ciMethod::is_klass_loaded 1000 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 1001 VM_ENTRY_MARK; 1002 return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved); 1003 } 1004 1005 // ------------------------------------------------------------------ 1006 // ciMethod::check_call 1007 bool ciMethod::check_call(int refinfo_index, bool is_static) const { 1008 VM_ENTRY_MARK; 1009 { 1010 EXCEPTION_MARK; 1011 HandleMark hm(THREAD); 1012 constantPoolHandle pool (THREAD, get_methodOop()->constants()); 1013 methodHandle spec_method; 1014 KlassHandle spec_klass; 1015 LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD); 1016 if (HAS_PENDING_EXCEPTION) { 1017 CLEAR_PENDING_EXCEPTION; 1018 return false; 1019 } else { 1020 return (spec_method->is_static() == is_static); 1021 } 1022 } 1023 return false; 1024 } 1025 1026 // ------------------------------------------------------------------ 1027 // ciMethod::print_codes 1028 // 1029 // Print the bytecodes for this method. 1030 void ciMethod::print_codes_on(outputStream* st) { 1031 check_is_loaded(); 1032 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);) 1033 } 1034 1035 1036 #define FETCH_FLAG_FROM_VM(flag_accessor) { \ 1037 check_is_loaded(); \ 1038 VM_ENTRY_MARK; \ 1039 return get_methodOop()->flag_accessor(); \ 1040 } 1041 1042 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); } 1043 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); } 1044 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); } 1045 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); } 1046 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); } 1047 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); } 1048 1049 BCEscapeAnalyzer *ciMethod::get_bcea() { 1050 if (_bcea == NULL) { 1051 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL); 1052 } 1053 return _bcea; 1054 } 1055 1056 ciMethodBlocks *ciMethod::get_method_blocks() { 1057 Arena *arena = CURRENT_ENV->arena(); 1058 if (_method_blocks == NULL) { 1059 _method_blocks = new (arena) ciMethodBlocks(arena, this); 1060 } 1061 return _method_blocks; 1062 } 1063 1064 #undef FETCH_FLAG_FROM_VM 1065 1066 1067 // ------------------------------------------------------------------ 1068 // ciMethod::print_codes 1069 // 1070 // Print a range of the bytecodes for this method. 1071 void ciMethod::print_codes_on(int from, int to, outputStream* st) { 1072 check_is_loaded(); 1073 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);) 1074 } 1075 1076 // ------------------------------------------------------------------ 1077 // ciMethod::print_name 1078 // 1079 // Print the name of this method, including signature and some flags. 1080 void ciMethod::print_name(outputStream* st) { 1081 check_is_loaded(); 1082 GUARDED_VM_ENTRY(get_methodOop()->print_name(st);) 1083 } 1084 1085 // ------------------------------------------------------------------ 1086 // ciMethod::print_short_name 1087 // 1088 // Print the name of this method, without signature. 1089 void ciMethod::print_short_name(outputStream* st) { 1090 check_is_loaded(); 1091 GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);) 1092 } 1093 1094 // ------------------------------------------------------------------ 1095 // ciMethod::print_impl 1096 // 1097 // Implementation of the print method. 1098 void ciMethod::print_impl(outputStream* st) { 1099 ciObject::print_impl(st); 1100 st->print(" name="); 1101 name()->print_symbol_on(st); 1102 st->print(" holder="); 1103 holder()->print_name_on(st); 1104 st->print(" signature="); 1105 signature()->as_symbol()->print_symbol_on(st); 1106 if (is_loaded()) { 1107 st->print(" loaded=true flags="); 1108 flags().print_member_flags(st); 1109 } else { 1110 st->print(" loaded=false"); 1111 } 1112 }