ciMethod.cpp revision 1499:e9ff18c4ace7
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. 38ciMethod::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#ifdef COMPILER2 60 _flow = NULL; 61#endif // COMPILER2 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. 114ciMethod::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#ifdef COMPILER2 128 _flow = NULL; 129#endif // COMPILER2 130} 131 132 133// ------------------------------------------------------------------ 134// ciMethod::load_code 135// 136// Load the bytecodes and exception handler table for this method. 137void 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 195bool 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 204u_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 213int 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. 224int 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// ------------------------------------------------------------------ 233// ciMethod::native_entry 234// 235// Get the address of this method's native code, if any. 236address ciMethod::native_entry() { 237 check_is_loaded(); 238 assert(flags().is_native(), "must be native method"); 239 VM_ENTRY_MARK; 240 methodOop method = get_methodOop(); 241 address entry = method->native_function(); 242 assert(entry != NULL, "must be valid entry point"); 243 return entry; 244} 245 246 247// ------------------------------------------------------------------ 248// ciMethod::interpreter_entry 249// 250// Get the entry point for running this method in the interpreter. 251address ciMethod::interpreter_entry() { 252 check_is_loaded(); 253 VM_ENTRY_MARK; 254 methodHandle mh(THREAD, get_methodOop()); 255 return Interpreter::entry_for_method(mh); 256} 257 258 259// ------------------------------------------------------------------ 260// ciMethod::uses_balanced_monitors 261// 262// Does this method use monitors in a strict stack-disciplined manner? 263bool ciMethod::has_balanced_monitors() { 264 check_is_loaded(); 265 if (_balanced_monitors) return true; 266 267 // Analyze the method to see if monitors are used properly. 268 VM_ENTRY_MARK; 269 methodHandle method(THREAD, get_methodOop()); 270 assert(method->has_monitor_bytecodes(), "should have checked this"); 271 272 // Check to see if a previous compilation computed the 273 // monitor-matching analysis. 274 if (method->guaranteed_monitor_matching()) { 275 _balanced_monitors = true; 276 return true; 277 } 278 279 { 280 EXCEPTION_MARK; 281 ResourceMark rm(THREAD); 282 GeneratePairingInfo gpi(method); 283 gpi.compute_map(CATCH); 284 if (!gpi.monitor_safe()) { 285 return false; 286 } 287 method->set_guaranteed_monitor_matching(); 288 _balanced_monitors = true; 289 } 290 return true; 291} 292 293 294// ------------------------------------------------------------------ 295// ciMethod::get_flow_analysis 296ciTypeFlow* ciMethod::get_flow_analysis() { 297#ifdef COMPILER2 298 if (_flow == NULL) { 299 ciEnv* env = CURRENT_ENV; 300 _flow = new (env->arena()) ciTypeFlow(env, this); 301 _flow->do_flow(); 302 } 303 return _flow; 304#else // COMPILER2 305 ShouldNotReachHere(); 306 return NULL; 307#endif // COMPILER2 308} 309 310 311// ------------------------------------------------------------------ 312// ciMethod::get_osr_flow_analysis 313ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) { 314#ifdef COMPILER2 315 // OSR entry points are always place after a call bytecode of some sort 316 assert(osr_bci >= 0, "must supply valid OSR entry point"); 317 ciEnv* env = CURRENT_ENV; 318 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci); 319 flow->do_flow(); 320 return flow; 321#else // COMPILER2 322 ShouldNotReachHere(); 323 return NULL; 324#endif // COMPILER2 325} 326 327// ------------------------------------------------------------------ 328// ciMethod::raw_liveness_at_bci 329// 330// Which local variables are live at a specific bci? 331MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) { 332 check_is_loaded(); 333 if (_liveness == NULL) { 334 // Create the liveness analyzer. 335 Arena* arena = CURRENT_ENV->arena(); 336 _liveness = new (arena) MethodLiveness(arena, this); 337 _liveness->compute_liveness(); 338 } 339 return _liveness->get_liveness_at(bci); 340} 341 342// ------------------------------------------------------------------ 343// ciMethod::liveness_at_bci 344// 345// Which local variables are live at a specific bci? When debugging 346// will return true for all locals in some cases to improve debug 347// information. 348MethodLivenessResult ciMethod::liveness_at_bci(int bci) { 349 MethodLivenessResult result = raw_liveness_at_bci(bci); 350 if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) { 351 // Keep all locals live for the user's edification and amusement. 352 result.at_put_range(0, result.size(), true); 353 } 354 return result; 355} 356 357// ciMethod::live_local_oops_at_bci 358// 359// find all the live oops in the locals array for a particular bci 360// Compute what the interpreter believes by using the interpreter 361// oopmap generator. This is used as a double check during osr to 362// guard against conservative result from MethodLiveness making us 363// think a dead oop is live. MethodLiveness is conservative in the 364// sense that it may consider locals to be live which cannot be live, 365// like in the case where a local could contain an oop or a primitive 366// along different paths. In that case the local must be dead when 367// those paths merge. Since the interpreter's viewpoint is used when 368// gc'ing an interpreter frame we need to use its viewpoint during 369// OSR when loading the locals. 370 371BitMap ciMethod::live_local_oops_at_bci(int bci) { 372 VM_ENTRY_MARK; 373 InterpreterOopMap mask; 374 OopMapCache::compute_one_oop_map(get_methodOop(), bci, &mask); 375 int mask_size = max_locals(); 376 BitMap result(mask_size); 377 result.clear(); 378 int i; 379 for (i = 0; i < mask_size ; i++ ) { 380 if (mask.is_oop(i)) result.set_bit(i); 381 } 382 return result; 383} 384 385 386#ifdef COMPILER1 387// ------------------------------------------------------------------ 388// ciMethod::bci_block_start 389// 390// Marks all bcis where a new basic block starts 391const BitMap ciMethod::bci_block_start() { 392 check_is_loaded(); 393 if (_liveness == NULL) { 394 // Create the liveness analyzer. 395 Arena* arena = CURRENT_ENV->arena(); 396 _liveness = new (arena) MethodLiveness(arena, this); 397 _liveness->compute_liveness(); 398 } 399 400 return _liveness->get_bci_block_start(); 401} 402#endif // COMPILER1 403 404 405// ------------------------------------------------------------------ 406// ciMethod::call_profile_at_bci 407// 408// Get the ciCallProfile for the invocation of this method. 409// Also reports receiver types for non-call type checks (if TypeProfileCasts). 410ciCallProfile ciMethod::call_profile_at_bci(int bci) { 411 ResourceMark rm; 412 ciCallProfile result; 413 if (method_data() != NULL && method_data()->is_mature()) { 414 ciProfileData* data = method_data()->bci_to_data(bci); 415 if (data != NULL && data->is_CounterData()) { 416 // Every profiled call site has a counter. 417 int count = data->as_CounterData()->count(); 418 419 if (!data->is_ReceiverTypeData()) { 420 result._receiver_count[0] = 0; // that's a definite zero 421 } else { // ReceiverTypeData is a subclass of CounterData 422 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData(); 423 // In addition, virtual call sites have receiver type information 424 int receivers_count_total = 0; 425 int morphism = 0; 426 for (uint i = 0; i < call->row_limit(); i++) { 427 ciKlass* receiver = call->receiver(i); 428 if (receiver == NULL) continue; 429 morphism += 1; 430 int rcount = call->receiver_count(i); 431 if (rcount == 0) rcount = 1; // Should be valid value 432 receivers_count_total += rcount; 433 // Add the receiver to result data. 434 result.add_receiver(receiver, rcount); 435 // If we extend profiling to record methods, 436 // we will set result._method also. 437 } 438 // Determine call site's morphism. 439 // The call site count is 0 with known morphism (onlt 1 or 2 receivers) 440 // or < 0 in the case of a type check failured for checkcast, aastore, instanceof. 441 // The call site count is > 0 in the case of a polymorphic virtual call. 442 if (morphism > 0 && morphism == result._limit) { 443 // The morphism <= MorphismLimit. 444 if ((morphism < ciCallProfile::MorphismLimit) || 445 (morphism == ciCallProfile::MorphismLimit && count == 0)) { 446#ifdef ASSERT 447 if (count > 0) { 448 this->print_short_name(tty); 449 tty->print_cr(" @ bci:%d", bci); 450 this->print_codes(); 451 assert(false, "this call site should not be polymorphic"); 452 } 453#endif 454 result._morphism = morphism; 455 } 456 } 457 // Make the count consistent if this is a call profile. If count is 458 // zero or less, presume that this is a typecheck profile and 459 // do nothing. Otherwise, increase count to be the sum of all 460 // receiver's counts. 461 if (count >= 0) { 462 count += receivers_count_total; 463 } 464 } 465 result._count = count; 466 } 467 } 468 return result; 469} 470 471// ------------------------------------------------------------------ 472// Add new receiver and sort data by receiver's profile count. 473void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) { 474 // Add new receiver and sort data by receiver's counts when we have space 475 // for it otherwise replace the less called receiver (less called receiver 476 // is placed to the last array element which is not used). 477 // First array's element contains most called receiver. 478 int i = _limit; 479 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) { 480 _receiver[i] = _receiver[i-1]; 481 _receiver_count[i] = _receiver_count[i-1]; 482 } 483 _receiver[i] = receiver; 484 _receiver_count[i] = receiver_count; 485 if (_limit < MorphismLimit) _limit++; 486} 487 488// ------------------------------------------------------------------ 489// ciMethod::find_monomorphic_target 490// 491// Given a certain calling environment, find the monomorphic target 492// for the call. Return NULL if the call is not monomorphic in 493// its calling environment, or if there are only abstract methods. 494// The returned method is never abstract. 495// Note: If caller uses a non-null result, it must inform dependencies 496// via assert_unique_concrete_method or assert_leaf_type. 497ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller, 498 ciInstanceKlass* callee_holder, 499 ciInstanceKlass* actual_recv) { 500 check_is_loaded(); 501 502 if (actual_recv->is_interface()) { 503 // %%% We cannot trust interface types, yet. See bug 6312651. 504 return NULL; 505 } 506 507 ciMethod* root_m = resolve_invoke(caller, actual_recv); 508 if (root_m == NULL) { 509 // Something went wrong looking up the actual receiver method. 510 return NULL; 511 } 512 assert(!root_m->is_abstract(), "resolve_invoke promise"); 513 514 // Make certain quick checks even if UseCHA is false. 515 516 // Is it private or final? 517 if (root_m->can_be_statically_bound()) { 518 return root_m; 519 } 520 521 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) { 522 // Easy case. There is no other place to put a method, so don't bother 523 // to go through the VM_ENTRY_MARK and all the rest. 524 return root_m; 525 } 526 527 // Array methods (clone, hashCode, etc.) are always statically bound. 528 // If we were to see an array type here, we'd return root_m. 529 // However, this method processes only ciInstanceKlasses. (See 4962591.) 530 // The inline_native_clone intrinsic narrows Object to T[] properly, 531 // so there is no need to do the same job here. 532 533 if (!UseCHA) return NULL; 534 535 VM_ENTRY_MARK; 536 537 methodHandle target; 538 { 539 MutexLocker locker(Compile_lock); 540 klassOop context = actual_recv->get_klassOop(); 541 target = Dependencies::find_unique_concrete_method(context, 542 root_m->get_methodOop()); 543 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods. 544 } 545 546#ifndef PRODUCT 547 if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) { 548 tty->print("found a non-root unique target method"); 549 tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name()); 550 tty->print(" method = "); 551 target->print_short_name(tty); 552 tty->cr(); 553 } 554#endif //PRODUCT 555 556 if (target() == NULL) { 557 return NULL; 558 } 559 if (target() == root_m->get_methodOop()) { 560 return root_m; 561 } 562 if (!root_m->is_public() && 563 !root_m->is_protected()) { 564 // If we are going to reason about inheritance, it's easiest 565 // if the method in question is public, protected, or private. 566 // If the answer is not root_m, it is conservatively correct 567 // to return NULL, even if the CHA encountered irrelevant 568 // methods in other packages. 569 // %%% TO DO: Work out logic for package-private methods 570 // with the same name but different vtable indexes. 571 return NULL; 572 } 573 return CURRENT_THREAD_ENV->get_object(target())->as_method(); 574} 575 576// ------------------------------------------------------------------ 577// ciMethod::resolve_invoke 578// 579// Given a known receiver klass, find the target for the call. 580// Return NULL if the call has no target or the target is abstract. 581ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) { 582 check_is_loaded(); 583 VM_ENTRY_MARK; 584 585 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 586 KlassHandle h_recv (THREAD, exact_receiver->get_klassOop()); 587 KlassHandle h_resolved (THREAD, holder()->get_klassOop()); 588 symbolHandle h_name (THREAD, name()->get_symbolOop()); 589 symbolHandle h_signature (THREAD, signature()->get_symbolOop()); 590 591 methodHandle m; 592 // Only do exact lookup if receiver klass has been linked. Otherwise, 593 // the vtable has not been setup, and the LinkResolver will fail. 594 if (h_recv->oop_is_javaArray() 595 || 596 instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) { 597 if (holder()->is_interface()) { 598 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 599 } else { 600 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 601 } 602 } 603 604 if (m.is_null()) { 605 // Return NULL only if there was a problem with lookup (uninitialized class, etc.) 606 return NULL; 607 } 608 609 ciMethod* result = this; 610 if (m() != get_methodOop()) { 611 result = CURRENT_THREAD_ENV->get_object(m())->as_method(); 612 } 613 614 // Don't return abstract methods because they aren't 615 // optimizable or interesting. 616 if (result->is_abstract()) { 617 return NULL; 618 } else { 619 return result; 620 } 621} 622 623// ------------------------------------------------------------------ 624// ciMethod::resolve_vtable_index 625// 626// Given a known receiver klass, find the vtable index for the call. 627// Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown. 628int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) { 629 check_is_loaded(); 630 631 int vtable_index = methodOopDesc::invalid_vtable_index; 632 // Only do lookup if receiver klass has been linked. Otherwise, 633 // the vtable has not been setup, and the LinkResolver will fail. 634 if (!receiver->is_interface() 635 && (!receiver->is_instance_klass() || 636 receiver->as_instance_klass()->is_linked())) { 637 VM_ENTRY_MARK; 638 639 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 640 KlassHandle h_recv (THREAD, receiver->get_klassOop()); 641 symbolHandle h_name (THREAD, name()->get_symbolOop()); 642 symbolHandle h_signature (THREAD, signature()->get_symbolOop()); 643 644 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass); 645 if (vtable_index == methodOopDesc::nonvirtual_vtable_index) { 646 // A statically bound method. Return "no such index". 647 vtable_index = methodOopDesc::invalid_vtable_index; 648 } 649 } 650 651 return vtable_index; 652} 653 654// ------------------------------------------------------------------ 655// ciMethod::interpreter_call_site_count 656int ciMethod::interpreter_call_site_count(int bci) { 657 if (method_data() != NULL) { 658 ResourceMark rm; 659 ciProfileData* data = method_data()->bci_to_data(bci); 660 if (data != NULL && data->is_CounterData()) { 661 return scale_count(data->as_CounterData()->count()); 662 } 663 } 664 return -1; // unknown 665} 666 667// ------------------------------------------------------------------ 668// Adjust a CounterData count to be commensurate with 669// interpreter_invocation_count. If the MDO exists for 670// only 25% of the time the method exists, then the 671// counts in the MDO should be scaled by 4X, so that 672// they can be usefully and stably compared against the 673// invocation counts in methods. 674int ciMethod::scale_count(int count, float prof_factor) { 675 if (count > 0 && method_data() != NULL) { 676 int current_mileage = method_data()->current_mileage(); 677 int creation_mileage = method_data()->creation_mileage(); 678 int counter_life = current_mileage - creation_mileage; 679 int method_life = interpreter_invocation_count(); 680 // counter_life due to backedge_counter could be > method_life 681 if (counter_life > method_life) 682 counter_life = method_life; 683 if (0 < counter_life && counter_life <= method_life) { 684 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5); 685 count = (count > 0) ? count : 1; 686 } 687 } 688 return count; 689} 690 691// ------------------------------------------------------------------ 692// invokedynamic support 693 694// ------------------------------------------------------------------ 695// ciMethod::is_method_handle_invoke 696// 697// Return true if the method is a MethodHandle target. 698bool ciMethod::is_method_handle_invoke() const { 699 bool flag = (holder()->name() == ciSymbol::java_dyn_MethodHandle() && 700 methodOopDesc::is_method_handle_invoke_name(name()->sid())); 701#ifdef ASSERT 702 if (is_loaded()) { 703 bool flag2 = ((flags().as_int() & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS); 704 { 705 VM_ENTRY_MARK; 706 bool flag3 = get_methodOop()->is_method_handle_invoke(); 707 assert(flag2 == flag3, "consistent"); 708 assert(flag == flag3, "consistent"); 709 } 710 } 711#endif //ASSERT 712 return flag; 713} 714 715// ------------------------------------------------------------------ 716// ciMethod::is_method_handle_adapter 717// 718// Return true if the method is a generated MethodHandle adapter. 719bool ciMethod::is_method_handle_adapter() const { 720 check_is_loaded(); 721 VM_ENTRY_MARK; 722 return get_methodOop()->is_method_handle_adapter(); 723} 724 725ciInstance* ciMethod::method_handle_type() { 726 check_is_loaded(); 727 VM_ENTRY_MARK; 728 oop mtype = get_methodOop()->method_handle_type(); 729 return CURRENT_THREAD_ENV->get_object(mtype)->as_instance(); 730} 731 732 733// ------------------------------------------------------------------ 734// ciMethod::build_method_data 735// 736// Generate new methodDataOop objects at compile time. 737void ciMethod::build_method_data(methodHandle h_m) { 738 EXCEPTION_CONTEXT; 739 if (is_native() || is_abstract() || h_m()->is_accessor()) return; 740 if (h_m()->method_data() == NULL) { 741 methodOopDesc::build_interpreter_method_data(h_m, THREAD); 742 if (HAS_PENDING_EXCEPTION) { 743 CLEAR_PENDING_EXCEPTION; 744 } 745 } 746 if (h_m()->method_data() != NULL) { 747 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 748 _method_data->load_data(); 749 } else { 750 _method_data = CURRENT_ENV->get_empty_methodData(); 751 } 752} 753 754// public, retroactive version 755void ciMethod::build_method_data() { 756 if (_method_data == NULL || _method_data->is_empty()) { 757 GUARDED_VM_ENTRY({ 758 build_method_data(get_methodOop()); 759 }); 760 } 761} 762 763 764// ------------------------------------------------------------------ 765// ciMethod::method_data 766// 767ciMethodData* ciMethod::method_data() { 768 if (_method_data != NULL) { 769 return _method_data; 770 } 771 VM_ENTRY_MARK; 772 ciEnv* env = CURRENT_ENV; 773 Thread* my_thread = JavaThread::current(); 774 methodHandle h_m(my_thread, get_methodOop()); 775 776 if (Tier1UpdateMethodData && is_tier1_compile(env->comp_level())) { 777 build_method_data(h_m); 778 } 779 780 if (h_m()->method_data() != NULL) { 781 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 782 _method_data->load_data(); 783 } else { 784 _method_data = CURRENT_ENV->get_empty_methodData(); 785 } 786 return _method_data; 787 788} 789 790 791// ------------------------------------------------------------------ 792// ciMethod::will_link 793// 794// Will this method link in a specific calling context? 795bool ciMethod::will_link(ciKlass* accessing_klass, 796 ciKlass* declared_method_holder, 797 Bytecodes::Code bc) { 798 if (!is_loaded()) { 799 // Method lookup failed. 800 return false; 801 } 802 803 // The link checks have been front-loaded into the get_method 804 // call. This method (ciMethod::will_link()) will be removed 805 // in the future. 806 807 return true; 808} 809 810// ------------------------------------------------------------------ 811// ciMethod::should_exclude 812// 813// Should this method be excluded from compilation? 814bool ciMethod::should_exclude() { 815 check_is_loaded(); 816 VM_ENTRY_MARK; 817 methodHandle mh(THREAD, get_methodOop()); 818 bool ignore; 819 return CompilerOracle::should_exclude(mh, ignore); 820} 821 822// ------------------------------------------------------------------ 823// ciMethod::should_inline 824// 825// Should this method be inlined during compilation? 826bool ciMethod::should_inline() { 827 check_is_loaded(); 828 VM_ENTRY_MARK; 829 methodHandle mh(THREAD, get_methodOop()); 830 return CompilerOracle::should_inline(mh); 831} 832 833// ------------------------------------------------------------------ 834// ciMethod::should_not_inline 835// 836// Should this method be disallowed from inlining during compilation? 837bool ciMethod::should_not_inline() { 838 check_is_loaded(); 839 VM_ENTRY_MARK; 840 methodHandle mh(THREAD, get_methodOop()); 841 return CompilerOracle::should_not_inline(mh); 842} 843 844// ------------------------------------------------------------------ 845// ciMethod::should_print_assembly 846// 847// Should the compiler print the generated code for this method? 848bool ciMethod::should_print_assembly() { 849 check_is_loaded(); 850 VM_ENTRY_MARK; 851 methodHandle mh(THREAD, get_methodOop()); 852 return CompilerOracle::should_print(mh); 853} 854 855// ------------------------------------------------------------------ 856// ciMethod::break_at_execute 857// 858// Should the compiler insert a breakpoint into the generated code 859// method? 860bool ciMethod::break_at_execute() { 861 check_is_loaded(); 862 VM_ENTRY_MARK; 863 methodHandle mh(THREAD, get_methodOop()); 864 return CompilerOracle::should_break_at(mh); 865} 866 867// ------------------------------------------------------------------ 868// ciMethod::has_option 869// 870bool ciMethod::has_option(const char* option) { 871 check_is_loaded(); 872 VM_ENTRY_MARK; 873 methodHandle mh(THREAD, get_methodOop()); 874 return CompilerOracle::has_option_string(mh, option); 875} 876 877// ------------------------------------------------------------------ 878// ciMethod::can_be_compiled 879// 880// Have previous compilations of this method succeeded? 881bool ciMethod::can_be_compiled() { 882 check_is_loaded(); 883 return _is_compilable; 884} 885 886// ------------------------------------------------------------------ 887// ciMethod::set_not_compilable 888// 889// Tell the VM that this method cannot be compiled at all. 890void ciMethod::set_not_compilable() { 891 check_is_loaded(); 892 VM_ENTRY_MARK; 893 _is_compilable = false; 894 get_methodOop()->set_not_compilable(); 895} 896 897// ------------------------------------------------------------------ 898// ciMethod::can_be_osr_compiled 899// 900// Have previous compilations of this method succeeded? 901// 902// Implementation note: the VM does not currently keep track 903// of failed OSR compilations per bci. The entry_bci parameter 904// is currently unused. 905bool ciMethod::can_be_osr_compiled(int entry_bci) { 906 check_is_loaded(); 907 VM_ENTRY_MARK; 908 return !get_methodOop()->access_flags().is_not_osr_compilable(); 909} 910 911// ------------------------------------------------------------------ 912// ciMethod::has_compiled_code 913bool ciMethod::has_compiled_code() { 914 VM_ENTRY_MARK; 915 return get_methodOop()->code() != NULL; 916} 917 918// ------------------------------------------------------------------ 919// ciMethod::instructions_size 920// This is a rough metric for "fat" methods, compared 921// before inlining with InlineSmallCode. 922// The CodeBlob::instructions_size accessor includes 923// junk like exception handler, stubs, and constant table, 924// which are not highly relevant to an inlined method. 925// So we use the more specific accessor nmethod::code_size. 926int ciMethod::instructions_size() { 927 GUARDED_VM_ENTRY( 928 nmethod* code = get_methodOop()->code(); 929 // if there's no compiled code or the code was produced by the 930 // tier1 profiler return 0 for the code size. This should 931 // probably be based on the compilation level of the nmethod but 932 // that currently isn't properly recorded. 933 if (code == NULL || 934 (TieredCompilation && code->compiler() != NULL && code->compiler()->is_c1())) { 935 return 0; 936 } 937 return code->code_end() - code->verified_entry_point(); 938 ) 939} 940 941// ------------------------------------------------------------------ 942// ciMethod::log_nmethod_identity 943void ciMethod::log_nmethod_identity(xmlStream* log) { 944 GUARDED_VM_ENTRY( 945 nmethod* code = get_methodOop()->code(); 946 if (code != NULL) { 947 code->log_identity(log); 948 } 949 ) 950} 951 952// ------------------------------------------------------------------ 953// ciMethod::is_not_reached 954bool ciMethod::is_not_reached(int bci) { 955 check_is_loaded(); 956 VM_ENTRY_MARK; 957 return Interpreter::is_not_reached( 958 methodHandle(THREAD, get_methodOop()), bci); 959} 960 961// ------------------------------------------------------------------ 962// ciMethod::was_never_executed 963bool ciMethod::was_executed_more_than(int times) { 964 VM_ENTRY_MARK; 965 return get_methodOop()->was_executed_more_than(times); 966} 967 968// ------------------------------------------------------------------ 969// ciMethod::has_unloaded_classes_in_signature 970bool ciMethod::has_unloaded_classes_in_signature() { 971 VM_ENTRY_MARK; 972 { 973 EXCEPTION_MARK; 974 methodHandle m(THREAD, get_methodOop()); 975 bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD); 976 if( HAS_PENDING_EXCEPTION ) { 977 CLEAR_PENDING_EXCEPTION; 978 return true; // Declare that we may have unloaded classes 979 } 980 return has_unloaded; 981 } 982} 983 984// ------------------------------------------------------------------ 985// ciMethod::is_klass_loaded 986bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 987 VM_ENTRY_MARK; 988 return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved); 989} 990 991// ------------------------------------------------------------------ 992// ciMethod::check_call 993bool ciMethod::check_call(int refinfo_index, bool is_static) const { 994 VM_ENTRY_MARK; 995 { 996 EXCEPTION_MARK; 997 HandleMark hm(THREAD); 998 constantPoolHandle pool (THREAD, get_methodOop()->constants()); 999 methodHandle spec_method; 1000 KlassHandle spec_klass; 1001 LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD); 1002 if (HAS_PENDING_EXCEPTION) { 1003 CLEAR_PENDING_EXCEPTION; 1004 return false; 1005 } else { 1006 return (spec_method->is_static() == is_static); 1007 } 1008 } 1009 return false; 1010} 1011 1012// ------------------------------------------------------------------ 1013// ciMethod::print_codes 1014// 1015// Print the bytecodes for this method. 1016void ciMethod::print_codes_on(outputStream* st) { 1017 check_is_loaded(); 1018 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);) 1019} 1020 1021 1022#define FETCH_FLAG_FROM_VM(flag_accessor) { \ 1023 check_is_loaded(); \ 1024 VM_ENTRY_MARK; \ 1025 return get_methodOop()->flag_accessor(); \ 1026} 1027 1028bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); } 1029bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); } 1030bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); } 1031bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); } 1032bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); } 1033bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); } 1034 1035BCEscapeAnalyzer *ciMethod::get_bcea() { 1036 if (_bcea == NULL) { 1037 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL); 1038 } 1039 return _bcea; 1040} 1041 1042ciMethodBlocks *ciMethod::get_method_blocks() { 1043 Arena *arena = CURRENT_ENV->arena(); 1044 if (_method_blocks == NULL) { 1045 _method_blocks = new (arena) ciMethodBlocks(arena, this); 1046 } 1047 return _method_blocks; 1048} 1049 1050#undef FETCH_FLAG_FROM_VM 1051 1052 1053// ------------------------------------------------------------------ 1054// ciMethod::print_codes 1055// 1056// Print a range of the bytecodes for this method. 1057void ciMethod::print_codes_on(int from, int to, outputStream* st) { 1058 check_is_loaded(); 1059 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);) 1060} 1061 1062// ------------------------------------------------------------------ 1063// ciMethod::print_name 1064// 1065// Print the name of this method, including signature and some flags. 1066void ciMethod::print_name(outputStream* st) { 1067 check_is_loaded(); 1068 GUARDED_VM_ENTRY(get_methodOop()->print_name(st);) 1069} 1070 1071// ------------------------------------------------------------------ 1072// ciMethod::print_short_name 1073// 1074// Print the name of this method, without signature. 1075void ciMethod::print_short_name(outputStream* st) { 1076 check_is_loaded(); 1077 GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);) 1078} 1079 1080// ------------------------------------------------------------------ 1081// ciMethod::print_impl 1082// 1083// Implementation of the print method. 1084void ciMethod::print_impl(outputStream* st) { 1085 ciObject::print_impl(st); 1086 st->print(" name="); 1087 name()->print_symbol_on(st); 1088 st->print(" holder="); 1089 holder()->print_name_on(st); 1090 st->print(" signature="); 1091 signature()->as_symbol()->print_symbol_on(st); 1092 if (is_loaded()) { 1093 st->print(" loaded=true flags="); 1094 flags().print_member_flags(st); 1095 } else { 1096 st->print(" loaded=false"); 1097 } 1098} 1099