1 /* 2 * Copyright 1999-2010 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any 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 #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. 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 #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. 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 // ------------------------------------------------------------------ 233 // ciMethod::native_entry 234 // 235 // Get the address of this method's native code, if any. 236 address 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. 251 address 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? 263 bool 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 296 ciTypeFlow* 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 313 ciTypeFlow* 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? 331 MethodLivenessResult 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. 348 MethodLivenessResult 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. 370 371 BitMap 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 391 const 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). 410 ciCallProfile 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 tty->print_cr("bci: %d", bci); 449 this->print_codes(); 450 assert(false, "this call site should not be polymorphic"); 451 } 452 #endif 453 result._morphism = morphism; 454 } 455 } 456 // Make the count consistent if this is a call profile. If count is 457 // zero or less, presume that this is a typecheck profile and 458 // do nothing. Otherwise, increase count to be the sum of all 459 // receiver's counts. 460 if (count >= 0) { 461 count += receivers_count_total; 462 } 463 } 464 result._count = count; 465 } 466 } 467 return result; 468 } 469 470 // ------------------------------------------------------------------ 471 // Add new receiver and sort data by receiver's profile count. 472 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) { 473 // Add new receiver and sort data by receiver's counts when we have space 474 // for it otherwise replace the less called receiver (less called receiver 475 // is placed to the last array element which is not used). 476 // First array's element contains most called receiver. 477 int i = _limit; 478 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) { 479 _receiver[i] = _receiver[i-1]; 480 _receiver_count[i] = _receiver_count[i-1]; 481 } 482 _receiver[i] = receiver; 483 _receiver_count[i] = receiver_count; 484 if (_limit < MorphismLimit) _limit++; 485 } 486 487 // ------------------------------------------------------------------ 488 // ciMethod::find_monomorphic_target 489 // 490 // Given a certain calling environment, find the monomorphic target 491 // for the call. Return NULL if the call is not monomorphic in 492 // its calling environment, or if there are only abstract methods. 493 // The returned method is never abstract. 494 // Note: If caller uses a non-null result, it must inform dependencies 495 // via assert_unique_concrete_method or assert_leaf_type. 496 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller, 497 ciInstanceKlass* callee_holder, 498 ciInstanceKlass* actual_recv) { 499 check_is_loaded(); 500 501 if (actual_recv->is_interface()) { 502 // %%% We cannot trust interface types, yet. See bug 6312651. 503 return NULL; 504 } 505 506 ciMethod* root_m = resolve_invoke(caller, actual_recv); 507 if (root_m == NULL) { 508 // Something went wrong looking up the actual receiver method. 509 return NULL; 510 } 511 assert(!root_m->is_abstract(), "resolve_invoke promise"); 512 513 // Make certain quick checks even if UseCHA is false. 514 515 // Is it private or final? 516 if (root_m->can_be_statically_bound()) { 517 return root_m; 518 } 519 520 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) { 521 // Easy case. There is no other place to put a method, so don't bother 522 // to go through the VM_ENTRY_MARK and all the rest. 523 return root_m; 524 } 525 526 // Array methods (clone, hashCode, etc.) are always statically bound. 527 // If we were to see an array type here, we'd return root_m. 528 // However, this method processes only ciInstanceKlasses. (See 4962591.) 529 // The inline_native_clone intrinsic narrows Object to T[] properly, 530 // so there is no need to do the same job here. 531 532 if (!UseCHA) return NULL; 533 534 VM_ENTRY_MARK; 535 536 methodHandle target; 537 { 538 MutexLocker locker(Compile_lock); 539 klassOop context = actual_recv->get_klassOop(); 540 target = Dependencies::find_unique_concrete_method(context, 541 root_m->get_methodOop()); 542 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods. 543 } 544 545 #ifndef PRODUCT 546 if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) { 547 tty->print("found a non-root unique target method"); 548 tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name()); 549 tty->print(" method = "); 550 target->print_short_name(tty); 551 tty->cr(); 552 } 553 #endif //PRODUCT 554 555 if (target() == NULL) { 556 return NULL; 557 } 558 if (target() == root_m->get_methodOop()) { 559 return root_m; 560 } 561 if (!root_m->is_public() && 562 !root_m->is_protected()) { 563 // If we are going to reason about inheritance, it's easiest 564 // if the method in question is public, protected, or private. 565 // If the answer is not root_m, it is conservatively correct 566 // to return NULL, even if the CHA encountered irrelevant 567 // methods in other packages. 568 // %%% TO DO: Work out logic for package-private methods 569 // with the same name but different vtable indexes. 570 return NULL; 571 } 572 return CURRENT_THREAD_ENV->get_object(target())->as_method(); 573 } 574 575 // ------------------------------------------------------------------ 576 // ciMethod::resolve_invoke 577 // 578 // Given a known receiver klass, find the target for the call. 579 // Return NULL if the call has no target or the target is abstract. 580 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) { 581 check_is_loaded(); 582 VM_ENTRY_MARK; 583 584 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 585 KlassHandle h_recv (THREAD, exact_receiver->get_klassOop()); 586 KlassHandle h_resolved (THREAD, holder()->get_klassOop()); 587 symbolHandle h_name (THREAD, name()->get_symbolOop()); 588 symbolHandle h_signature (THREAD, signature()->get_symbolOop()); 589 590 methodHandle m; 591 // Only do exact lookup if receiver klass has been linked. Otherwise, 592 // the vtable has not been setup, and the LinkResolver will fail. 593 if (h_recv->oop_is_javaArray() 594 || 595 instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) { 596 if (holder()->is_interface()) { 597 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 598 } else { 599 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 600 } 601 } 602 603 if (m.is_null()) { 604 // Return NULL only if there was a problem with lookup (uninitialized class, etc.) 605 return NULL; 606 } 607 608 ciMethod* result = this; 609 if (m() != get_methodOop()) { 610 result = CURRENT_THREAD_ENV->get_object(m())->as_method(); 611 } 612 613 // Don't return abstract methods because they aren't 614 // optimizable or interesting. 615 if (result->is_abstract()) { 616 return NULL; 617 } else { 618 return result; 619 } 620 } 621 622 // ------------------------------------------------------------------ 623 // ciMethod::resolve_vtable_index 624 // 625 // Given a known receiver klass, find the vtable index for the call. 626 // Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown. 627 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) { 628 check_is_loaded(); 629 630 int vtable_index = methodOopDesc::invalid_vtable_index; 631 // Only do lookup if receiver klass has been linked. Otherwise, 632 // the vtable has not been setup, and the LinkResolver will fail. 633 if (!receiver->is_interface() 634 && (!receiver->is_instance_klass() || 635 receiver->as_instance_klass()->is_linked())) { 636 VM_ENTRY_MARK; 637 638 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 639 KlassHandle h_recv (THREAD, receiver->get_klassOop()); 640 symbolHandle h_name (THREAD, name()->get_symbolOop()); 641 symbolHandle h_signature (THREAD, signature()->get_symbolOop()); 642 643 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass); 644 if (vtable_index == methodOopDesc::nonvirtual_vtable_index) { 645 // A statically bound method. Return "no such index". 646 vtable_index = methodOopDesc::invalid_vtable_index; 647 } 648 } 649 650 return vtable_index; 651 } 652 653 // ------------------------------------------------------------------ 654 // ciMethod::interpreter_call_site_count 655 int ciMethod::interpreter_call_site_count(int bci) { 656 if (method_data() != NULL) { 657 ResourceMark rm; 658 ciProfileData* data = method_data()->bci_to_data(bci); 659 if (data != NULL && data->is_CounterData()) { 660 return scale_count(data->as_CounterData()->count()); 661 } 662 } 663 return -1; // unknown 664 } 665 666 // ------------------------------------------------------------------ 667 // Adjust a CounterData count to be commensurate with 668 // interpreter_invocation_count. If the MDO exists for 669 // only 25% of the time the method exists, then the 670 // counts in the MDO should be scaled by 4X, so that 671 // they can be usefully and stably compared against the 672 // invocation counts in methods. 673 int ciMethod::scale_count(int count, float prof_factor) { 674 if (count > 0 && method_data() != NULL) { 675 int current_mileage = method_data()->current_mileage(); 676 int creation_mileage = method_data()->creation_mileage(); 677 int counter_life = current_mileage - creation_mileage; 678 int method_life = interpreter_invocation_count(); 679 // counter_life due to backedge_counter could be > method_life 680 if (counter_life > method_life) 681 counter_life = method_life; 682 if (0 < counter_life && counter_life <= method_life) { 683 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5); 684 count = (count > 0) ? count : 1; 685 } 686 } 687 return count; 688 } 689 690 // ------------------------------------------------------------------ 691 // invokedynamic support 692 // 693 bool ciMethod::is_method_handle_invoke() const { 694 check_is_loaded(); 695 bool flag = ((flags().as_int() & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS); 696 #ifdef ASSERT 697 { 698 VM_ENTRY_MARK; 699 bool flag2 = get_methodOop()->is_method_handle_invoke(); 700 assert(flag == flag2, "consistent"); 701 } 702 #endif //ASSERT 703 return flag; 704 } 705 706 bool ciMethod::is_method_handle_adapter() const { 707 check_is_loaded(); 708 VM_ENTRY_MARK; 709 return get_methodOop()->is_method_handle_adapter(); 710 } 711 712 ciInstance* ciMethod::method_handle_type() { 713 check_is_loaded(); 714 VM_ENTRY_MARK; 715 oop mtype = get_methodOop()->method_handle_type(); 716 return CURRENT_THREAD_ENV->get_object(mtype)->as_instance(); 717 } 718 719 720 // ------------------------------------------------------------------ 721 // ciMethod::build_method_data 722 // 723 // Generate new methodDataOop objects at compile time. 724 void ciMethod::build_method_data(methodHandle h_m) { 725 EXCEPTION_CONTEXT; 726 if (is_native() || is_abstract() || h_m()->is_accessor()) return; 727 if (h_m()->method_data() == NULL) { 728 methodOopDesc::build_interpreter_method_data(h_m, THREAD); 729 if (HAS_PENDING_EXCEPTION) { 730 CLEAR_PENDING_EXCEPTION; 731 } 732 } 733 if (h_m()->method_data() != NULL) { 734 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 735 _method_data->load_data(); 736 } else { 737 _method_data = CURRENT_ENV->get_empty_methodData(); 738 } 739 } 740 741 // public, retroactive version 742 void ciMethod::build_method_data() { 743 if (_method_data == NULL || _method_data->is_empty()) { 744 GUARDED_VM_ENTRY({ 745 build_method_data(get_methodOop()); 746 }); 747 } 748 } 749 750 751 // ------------------------------------------------------------------ 752 // ciMethod::method_data 753 // 754 ciMethodData* ciMethod::method_data() { 755 if (_method_data != NULL) { 756 return _method_data; 757 } 758 VM_ENTRY_MARK; 759 ciEnv* env = CURRENT_ENV; 760 Thread* my_thread = JavaThread::current(); 761 methodHandle h_m(my_thread, get_methodOop()); 762 763 if (Tier1UpdateMethodData && is_tier1_compile(env->comp_level())) { 764 build_method_data(h_m); 765 } 766 767 if (h_m()->method_data() != NULL) { 768 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 769 _method_data->load_data(); 770 } else { 771 _method_data = CURRENT_ENV->get_empty_methodData(); 772 } 773 return _method_data; 774 775 } 776 777 778 // ------------------------------------------------------------------ 779 // ciMethod::will_link 780 // 781 // Will this method link in a specific calling context? 782 bool ciMethod::will_link(ciKlass* accessing_klass, 783 ciKlass* declared_method_holder, 784 Bytecodes::Code bc) { 785 if (!is_loaded()) { 786 // Method lookup failed. 787 return false; 788 } 789 790 // The link checks have been front-loaded into the get_method 791 // call. This method (ciMethod::will_link()) will be removed 792 // in the future. 793 794 return true; 795 } 796 797 // ------------------------------------------------------------------ 798 // ciMethod::should_exclude 799 // 800 // Should this method be excluded from compilation? 801 bool ciMethod::should_exclude() { 802 check_is_loaded(); 803 VM_ENTRY_MARK; 804 methodHandle mh(THREAD, get_methodOop()); 805 bool ignore; 806 return CompilerOracle::should_exclude(mh, ignore); 807 } 808 809 // ------------------------------------------------------------------ 810 // ciMethod::should_inline 811 // 812 // Should this method be inlined during compilation? 813 bool ciMethod::should_inline() { 814 check_is_loaded(); 815 VM_ENTRY_MARK; 816 methodHandle mh(THREAD, get_methodOop()); 817 return CompilerOracle::should_inline(mh); 818 } 819 820 // ------------------------------------------------------------------ 821 // ciMethod::should_not_inline 822 // 823 // Should this method be disallowed from inlining during compilation? 824 bool ciMethod::should_not_inline() { 825 check_is_loaded(); 826 VM_ENTRY_MARK; 827 methodHandle mh(THREAD, get_methodOop()); 828 return CompilerOracle::should_not_inline(mh); 829 } 830 831 // ------------------------------------------------------------------ 832 // ciMethod::should_print_assembly 833 // 834 // Should the compiler print the generated code for this method? 835 bool ciMethod::should_print_assembly() { 836 check_is_loaded(); 837 VM_ENTRY_MARK; 838 methodHandle mh(THREAD, get_methodOop()); 839 return CompilerOracle::should_print(mh); 840 } 841 842 // ------------------------------------------------------------------ 843 // ciMethod::break_at_execute 844 // 845 // Should the compiler insert a breakpoint into the generated code 846 // method? 847 bool ciMethod::break_at_execute() { 848 check_is_loaded(); 849 VM_ENTRY_MARK; 850 methodHandle mh(THREAD, get_methodOop()); 851 return CompilerOracle::should_break_at(mh); 852 } 853 854 // ------------------------------------------------------------------ 855 // ciMethod::has_option 856 // 857 bool ciMethod::has_option(const char* option) { 858 check_is_loaded(); 859 VM_ENTRY_MARK; 860 methodHandle mh(THREAD, get_methodOop()); 861 return CompilerOracle::has_option_string(mh, option); 862 } 863 864 // ------------------------------------------------------------------ 865 // ciMethod::can_be_compiled 866 // 867 // Have previous compilations of this method succeeded? 868 bool ciMethod::can_be_compiled() { 869 check_is_loaded(); 870 return _is_compilable; 871 } 872 873 // ------------------------------------------------------------------ 874 // ciMethod::set_not_compilable 875 // 876 // Tell the VM that this method cannot be compiled at all. 877 void ciMethod::set_not_compilable() { 878 check_is_loaded(); 879 VM_ENTRY_MARK; 880 _is_compilable = false; 881 get_methodOop()->set_not_compilable(); 882 } 883 884 // ------------------------------------------------------------------ 885 // ciMethod::can_be_osr_compiled 886 // 887 // Have previous compilations of this method succeeded? 888 // 889 // Implementation note: the VM does not currently keep track 890 // of failed OSR compilations per bci. The entry_bci parameter 891 // is currently unused. 892 bool ciMethod::can_be_osr_compiled(int entry_bci) { 893 check_is_loaded(); 894 VM_ENTRY_MARK; 895 return !get_methodOop()->access_flags().is_not_osr_compilable(); 896 } 897 898 // ------------------------------------------------------------------ 899 // ciMethod::has_compiled_code 900 bool ciMethod::has_compiled_code() { 901 VM_ENTRY_MARK; 902 return get_methodOop()->code() != NULL; 903 } 904 905 // ------------------------------------------------------------------ 906 // ciMethod::instructions_size 907 // This is a rough metric for "fat" methods, compared 908 // before inlining with InlineSmallCode. 909 // The CodeBlob::instructions_size accessor includes 910 // junk like exception handler, stubs, and constant table, 911 // which are not highly relevant to an inlined method. 912 // So we use the more specific accessor nmethod::code_size. 913 int ciMethod::instructions_size() { 914 GUARDED_VM_ENTRY( 915 nmethod* code = get_methodOop()->code(); 916 // if there's no compiled code or the code was produced by the 917 // tier1 profiler return 0 for the code size. This should 918 // probably be based on the compilation level of the nmethod but 919 // that currently isn't properly recorded. 920 if (code == NULL || 921 (TieredCompilation && code->compiler() != NULL && code->compiler()->is_c1())) { 922 return 0; 923 } 924 return code->code_end() - code->verified_entry_point(); 925 ) 926 } 927 928 // ------------------------------------------------------------------ 929 // ciMethod::log_nmethod_identity 930 void ciMethod::log_nmethod_identity(xmlStream* log) { 931 GUARDED_VM_ENTRY( 932 nmethod* code = get_methodOop()->code(); 933 if (code != NULL) { 934 code->log_identity(log); 935 } 936 ) 937 } 938 939 // ------------------------------------------------------------------ 940 // ciMethod::is_not_reached 941 bool ciMethod::is_not_reached(int bci) { 942 check_is_loaded(); 943 VM_ENTRY_MARK; 944 return Interpreter::is_not_reached( 945 methodHandle(THREAD, get_methodOop()), bci); 946 } 947 948 // ------------------------------------------------------------------ 949 // ciMethod::was_never_executed 950 bool ciMethod::was_executed_more_than(int times) { 951 VM_ENTRY_MARK; 952 return get_methodOop()->was_executed_more_than(times); 953 } 954 955 // ------------------------------------------------------------------ 956 // ciMethod::has_unloaded_classes_in_signature 957 bool ciMethod::has_unloaded_classes_in_signature() { 958 VM_ENTRY_MARK; 959 { 960 EXCEPTION_MARK; 961 methodHandle m(THREAD, get_methodOop()); 962 bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD); 963 if( HAS_PENDING_EXCEPTION ) { 964 CLEAR_PENDING_EXCEPTION; 965 return true; // Declare that we may have unloaded classes 966 } 967 return has_unloaded; 968 } 969 } 970 971 // ------------------------------------------------------------------ 972 // ciMethod::is_klass_loaded 973 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 974 VM_ENTRY_MARK; 975 return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved); 976 } 977 978 // ------------------------------------------------------------------ 979 // ciMethod::check_call 980 bool ciMethod::check_call(int refinfo_index, bool is_static) const { 981 VM_ENTRY_MARK; 982 { 983 EXCEPTION_MARK; 984 HandleMark hm(THREAD); 985 constantPoolHandle pool (THREAD, get_methodOop()->constants()); 986 methodHandle spec_method; 987 KlassHandle spec_klass; 988 LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD); 989 if (HAS_PENDING_EXCEPTION) { 990 CLEAR_PENDING_EXCEPTION; 991 return false; 992 } else { 993 return (spec_method->is_static() == is_static); 994 } 995 } 996 return false; 997 } 998 999 // ------------------------------------------------------------------ 1000 // ciMethod::print_codes 1001 // 1002 // Print the bytecodes for this method. 1003 void ciMethod::print_codes_on(outputStream* st) { 1004 check_is_loaded(); 1005 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);) 1006 } 1007 1008 1009 #define FETCH_FLAG_FROM_VM(flag_accessor) { \ 1010 check_is_loaded(); \ 1011 VM_ENTRY_MARK; \ 1012 return get_methodOop()->flag_accessor(); \ 1013 } 1014 1015 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); } 1016 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); } 1017 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); } 1018 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); } 1019 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); } 1020 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); } 1021 1022 BCEscapeAnalyzer *ciMethod::get_bcea() { 1023 if (_bcea == NULL) { 1024 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL); 1025 } 1026 return _bcea; 1027 } 1028 1029 ciMethodBlocks *ciMethod::get_method_blocks() { 1030 Arena *arena = CURRENT_ENV->arena(); 1031 if (_method_blocks == NULL) { 1032 _method_blocks = new (arena) ciMethodBlocks(arena, this); 1033 } 1034 return _method_blocks; 1035 } 1036 1037 #undef FETCH_FLAG_FROM_VM 1038 1039 1040 // ------------------------------------------------------------------ 1041 // ciMethod::print_codes 1042 // 1043 // Print a range of the bytecodes for this method. 1044 void ciMethod::print_codes_on(int from, int to, outputStream* st) { 1045 check_is_loaded(); 1046 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);) 1047 } 1048 1049 // ------------------------------------------------------------------ 1050 // ciMethod::print_name 1051 // 1052 // Print the name of this method, including signature and some flags. 1053 void ciMethod::print_name(outputStream* st) { 1054 check_is_loaded(); 1055 GUARDED_VM_ENTRY(get_methodOop()->print_name(st);) 1056 } 1057 1058 // ------------------------------------------------------------------ 1059 // ciMethod::print_short_name 1060 // 1061 // Print the name of this method, without signature. 1062 void ciMethod::print_short_name(outputStream* st) { 1063 check_is_loaded(); 1064 GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);) 1065 } 1066 1067 // ------------------------------------------------------------------ 1068 // ciMethod::print_impl 1069 // 1070 // Implementation of the print method. 1071 void ciMethod::print_impl(outputStream* st) { 1072 ciObject::print_impl(st); 1073 st->print(" name="); 1074 name()->print_symbol_on(st); 1075 st->print(" holder="); 1076 holder()->print_name_on(st); 1077 st->print(" signature="); 1078 signature()->as_symbol()->print_symbol_on(st); 1079 if (is_loaded()) { 1080 st->print(" loaded=true flags="); 1081 flags().print_member_flags(st); 1082 } else { 1083 st->print(" loaded=false"); 1084 } 1085 }