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_c1_compilable = !h_m()->is_not_c1_compilable(); 53 _is_c2_compilable = !h_m()->is_not_c2_compilable(); 54 // Lazy fields, filled in on demand. Require allocation. 55 _code = NULL; 56 _exception_handlers = NULL; 57 _liveness = NULL; 58 _method_blocks = NULL; 59 #if defined(COMPILER2) || defined(SHARK) 60 _flow = NULL; 61 _bcea = NULL; 62 #endif // COMPILER2 || SHARK 63 64 ciEnv *env = CURRENT_ENV; 65 if (env->jvmti_can_hotswap_or_post_breakpoint() && can_be_compiled()) { 66 // 6328518 check hotswap conditions under the right lock. 67 MutexLocker locker(Compile_lock); 68 if (Dependencies::check_evol_method(h_m()) != NULL) { 69 _is_c1_compilable = false; 70 _is_c2_compilable = false; 71 } 72 } else { 73 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 74 } 75 76 if (instanceKlass::cast(h_m()->method_holder())->is_linked()) { 77 _can_be_statically_bound = h_m()->can_be_statically_bound(); 78 } else { 79 // Have to use a conservative value in this case. 80 _can_be_statically_bound = false; 81 } 82 83 // Adjust the definition of this condition to be more useful: 84 // %%% take these conditions into account in vtable generation 85 if (!_can_be_statically_bound && h_m()->is_private()) 86 _can_be_statically_bound = true; 87 if (_can_be_statically_bound && h_m()->is_abstract()) 88 _can_be_statically_bound = false; 89 90 // generating _signature may allow GC and therefore move m. 91 // These fields are always filled in. 92 _name = env->get_object(h_m()->name())->as_symbol(); 93 _holder = env->get_object(h_m()->method_holder())->as_instance_klass(); 94 ciSymbol* sig_symbol = env->get_object(h_m()->signature())->as_symbol(); 95 _signature = new (env->arena()) ciSignature(_holder, sig_symbol); 96 _method_data = NULL; 97 // Take a snapshot of these values, so they will be commensurate with the MDO. 98 if (ProfileInterpreter || TieredCompilation) { 99 int invcnt = h_m()->interpreter_invocation_count(); 100 // if the value overflowed report it as max int 101 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ; 102 _interpreter_throwout_count = h_m()->interpreter_throwout_count(); 103 } else { 104 _interpreter_invocation_count = 0; 105 _interpreter_throwout_count = 0; 106 } 107 if (_interpreter_invocation_count == 0) 108 _interpreter_invocation_count = 1; 109 } 110 111 112 // ------------------------------------------------------------------ 113 // ciMethod::ciMethod 114 // 115 // Unloaded method. 116 ciMethod::ciMethod(ciInstanceKlass* holder, 117 ciSymbol* name, 118 ciSymbol* signature) : ciObject(ciMethodKlass::make()) { 119 // These fields are always filled in. 120 _name = name; 121 _holder = holder; 122 _signature = new (CURRENT_ENV->arena()) ciSignature(_holder, signature); 123 _intrinsic_id = vmIntrinsics::_none; 124 _liveness = NULL; 125 _can_be_statically_bound = false; 126 _method_blocks = NULL; 127 _method_data = NULL; 128 #if defined(COMPILER2) || defined(SHARK) 129 _flow = NULL; 130 _bcea = NULL; 131 #endif // COMPILER2 || SHARK 132 } 133 134 135 // ------------------------------------------------------------------ 136 // ciMethod::load_code 137 // 138 // Load the bytecodes and exception handler table for this method. 139 void ciMethod::load_code() { 140 VM_ENTRY_MARK; 141 assert(is_loaded(), "only loaded methods have code"); 142 143 methodOop me = get_methodOop(); 144 Arena* arena = CURRENT_THREAD_ENV->arena(); 145 146 // Load the bytecodes. 147 _code = (address)arena->Amalloc(code_size()); 148 memcpy(_code, me->code_base(), code_size()); 149 150 // Revert any breakpoint bytecodes in ci's copy 151 if (me->number_of_breakpoints() > 0) { 152 BreakpointInfo* bp = instanceKlass::cast(me->method_holder())->breakpoints(); 153 for (; bp != NULL; bp = bp->next()) { 154 if (bp->match(me)) { 155 code_at_put(bp->bci(), bp->orig_bytecode()); 156 } 157 } 158 } 159 160 // And load the exception table. 161 typeArrayOop exc_table = me->exception_table(); 162 163 // Allocate one extra spot in our list of exceptions. This 164 // last entry will be used to represent the possibility that 165 // an exception escapes the method. See ciExceptionHandlerStream 166 // for details. 167 _exception_handlers = 168 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*) 169 * (_handler_count + 1)); 170 if (_handler_count > 0) { 171 for (int i=0; i<_handler_count; i++) { 172 int base = i*4; 173 _exception_handlers[i] = new (arena) ciExceptionHandler( 174 holder(), 175 /* start */ exc_table->int_at(base), 176 /* limit */ exc_table->int_at(base+1), 177 /* goto pc */ exc_table->int_at(base+2), 178 /* cp index */ exc_table->int_at(base+3)); 179 } 180 } 181 182 // Put an entry at the end of our list to represent the possibility 183 // of exceptional exit. 184 _exception_handlers[_handler_count] = 185 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0); 186 187 if (CIPrintMethodCodes) { 188 print_codes(); 189 } 190 } 191 192 193 // ------------------------------------------------------------------ 194 // ciMethod::has_linenumber_table 195 // 196 // length unknown until decompression 197 bool ciMethod::has_linenumber_table() const { 198 check_is_loaded(); 199 VM_ENTRY_MARK; 200 return get_methodOop()->has_linenumber_table(); 201 } 202 203 204 // ------------------------------------------------------------------ 205 // ciMethod::compressed_linenumber_table 206 u_char* ciMethod::compressed_linenumber_table() const { 207 check_is_loaded(); 208 VM_ENTRY_MARK; 209 return get_methodOop()->compressed_linenumber_table(); 210 } 211 212 213 // ------------------------------------------------------------------ 214 // ciMethod::line_number_from_bci 215 int ciMethod::line_number_from_bci(int bci) const { 216 check_is_loaded(); 217 VM_ENTRY_MARK; 218 return get_methodOop()->line_number_from_bci(bci); 219 } 220 221 222 // ------------------------------------------------------------------ 223 // ciMethod::vtable_index 224 // 225 // Get the position of this method's entry in the vtable, if any. 226 int ciMethod::vtable_index() { 227 check_is_loaded(); 228 assert(holder()->is_linked(), "must be linked"); 229 VM_ENTRY_MARK; 230 return get_methodOop()->vtable_index(); 231 } 232 233 234 #ifdef SHARK 235 // ------------------------------------------------------------------ 236 // ciMethod::itable_index 237 // 238 // Get the position of this method's entry in the itable, if any. 239 int ciMethod::itable_index() { 240 check_is_loaded(); 241 assert(holder()->is_linked(), "must be linked"); 242 VM_ENTRY_MARK; 243 return klassItable::compute_itable_index(get_methodOop()); 244 } 245 #endif // SHARK 246 247 248 // ------------------------------------------------------------------ 249 // ciMethod::native_entry 250 // 251 // Get the address of this method's native code, if any. 252 address ciMethod::native_entry() { 253 check_is_loaded(); 254 assert(flags().is_native(), "must be native method"); 255 VM_ENTRY_MARK; 256 methodOop method = get_methodOop(); 257 address entry = method->native_function(); 258 assert(entry != NULL, "must be valid entry point"); 259 return entry; 260 } 261 262 263 // ------------------------------------------------------------------ 264 // ciMethod::interpreter_entry 265 // 266 // Get the entry point for running this method in the interpreter. 267 address ciMethod::interpreter_entry() { 268 check_is_loaded(); 269 VM_ENTRY_MARK; 270 methodHandle mh(THREAD, get_methodOop()); 271 return Interpreter::entry_for_method(mh); 272 } 273 274 275 // ------------------------------------------------------------------ 276 // ciMethod::uses_balanced_monitors 277 // 278 // Does this method use monitors in a strict stack-disciplined manner? 279 bool ciMethod::has_balanced_monitors() { 280 check_is_loaded(); 281 if (_balanced_monitors) return true; 282 283 // Analyze the method to see if monitors are used properly. 284 VM_ENTRY_MARK; 285 methodHandle method(THREAD, get_methodOop()); 286 assert(method->has_monitor_bytecodes(), "should have checked this"); 287 288 // Check to see if a previous compilation computed the 289 // monitor-matching analysis. 290 if (method->guaranteed_monitor_matching()) { 291 _balanced_monitors = true; 292 return true; 293 } 294 295 { 296 EXCEPTION_MARK; 297 ResourceMark rm(THREAD); 298 GeneratePairingInfo gpi(method); 299 gpi.compute_map(CATCH); 300 if (!gpi.monitor_safe()) { 301 return false; 302 } 303 method->set_guaranteed_monitor_matching(); 304 _balanced_monitors = true; 305 } 306 return true; 307 } 308 309 310 // ------------------------------------------------------------------ 311 // ciMethod::get_flow_analysis 312 ciTypeFlow* ciMethod::get_flow_analysis() { 313 #if defined(COMPILER2) || defined(SHARK) 314 if (_flow == NULL) { 315 ciEnv* env = CURRENT_ENV; 316 _flow = new (env->arena()) ciTypeFlow(env, this); 317 _flow->do_flow(); 318 } 319 return _flow; 320 #else // COMPILER2 || SHARK 321 ShouldNotReachHere(); 322 return NULL; 323 #endif // COMPILER2 || SHARK 324 } 325 326 327 // ------------------------------------------------------------------ 328 // ciMethod::get_osr_flow_analysis 329 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) { 330 #if defined(COMPILER2) || defined(SHARK) 331 // OSR entry points are always place after a call bytecode of some sort 332 assert(osr_bci >= 0, "must supply valid OSR entry point"); 333 ciEnv* env = CURRENT_ENV; 334 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci); 335 flow->do_flow(); 336 return flow; 337 #else // COMPILER2 || SHARK 338 ShouldNotReachHere(); 339 return NULL; 340 #endif // COMPILER2 || SHARK 341 } 342 343 // ------------------------------------------------------------------ 344 // ciMethod::raw_liveness_at_bci 345 // 346 // Which local variables are live at a specific bci? 347 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) { 348 check_is_loaded(); 349 if (_liveness == NULL) { 350 // Create the liveness analyzer. 351 Arena* arena = CURRENT_ENV->arena(); 352 _liveness = new (arena) MethodLiveness(arena, this); 353 _liveness->compute_liveness(); 354 } 355 return _liveness->get_liveness_at(bci); 356 } 357 358 // ------------------------------------------------------------------ 359 // ciMethod::liveness_at_bci 360 // 361 // Which local variables are live at a specific bci? When debugging 362 // will return true for all locals in some cases to improve debug 363 // information. 364 MethodLivenessResult ciMethod::liveness_at_bci(int bci) { 365 MethodLivenessResult result = raw_liveness_at_bci(bci); 366 if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) { 367 // Keep all locals live for the user's edification and amusement. 368 result.at_put_range(0, result.size(), true); 369 } 370 return result; 371 } 372 373 // ciMethod::live_local_oops_at_bci 374 // 375 // find all the live oops in the locals array for a particular bci 376 // Compute what the interpreter believes by using the interpreter 377 // oopmap generator. This is used as a double check during osr to 378 // guard against conservative result from MethodLiveness making us 379 // think a dead oop is live. MethodLiveness is conservative in the 380 // sense that it may consider locals to be live which cannot be live, 381 // like in the case where a local could contain an oop or a primitive 382 // along different paths. In that case the local must be dead when 383 // those paths merge. Since the interpreter's viewpoint is used when 384 // gc'ing an interpreter frame we need to use its viewpoint during 385 // OSR when loading the locals. 386 387 BitMap ciMethod::live_local_oops_at_bci(int bci) { 388 VM_ENTRY_MARK; 389 InterpreterOopMap mask; 390 OopMapCache::compute_one_oop_map(get_methodOop(), bci, &mask); 391 int mask_size = max_locals(); 392 BitMap result(mask_size); 393 result.clear(); 394 int i; 395 for (i = 0; i < mask_size ; i++ ) { 396 if (mask.is_oop(i)) result.set_bit(i); 397 } 398 return result; 399 } 400 401 402 #ifdef COMPILER1 403 // ------------------------------------------------------------------ 404 // ciMethod::bci_block_start 405 // 406 // Marks all bcis where a new basic block starts 407 const BitMap ciMethod::bci_block_start() { 408 check_is_loaded(); 409 if (_liveness == NULL) { 410 // Create the liveness analyzer. 411 Arena* arena = CURRENT_ENV->arena(); 412 _liveness = new (arena) MethodLiveness(arena, this); 413 _liveness->compute_liveness(); 414 } 415 416 return _liveness->get_bci_block_start(); 417 } 418 #endif // COMPILER1 419 420 421 // ------------------------------------------------------------------ 422 // ciMethod::call_profile_at_bci 423 // 424 // Get the ciCallProfile for the invocation of this method. 425 // Also reports receiver types for non-call type checks (if TypeProfileCasts). 426 ciCallProfile ciMethod::call_profile_at_bci(int bci) { 427 ResourceMark rm; 428 ciCallProfile result; 429 if (method_data() != NULL && method_data()->is_mature()) { 430 ciProfileData* data = method_data()->bci_to_data(bci); 431 if (data != NULL && data->is_CounterData()) { 432 // Every profiled call site has a counter. 433 int count = data->as_CounterData()->count(); 434 435 if (!data->is_ReceiverTypeData()) { 436 result._receiver_count[0] = 0; // that's a definite zero 437 } else { // ReceiverTypeData is a subclass of CounterData 438 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData(); 439 // In addition, virtual call sites have receiver type information 440 int receivers_count_total = 0; 441 int morphism = 0; 442 // Precompute morphism for the possible fixup 443 for (uint i = 0; i < call->row_limit(); i++) { 444 ciKlass* receiver = call->receiver(i); 445 if (receiver == NULL) continue; 446 morphism++; 447 } 448 int epsilon = 0; 449 if (TieredCompilation && ProfileInterpreter) { 450 // Interpreter and C1 treat final and special invokes differently. 451 // C1 will record a type, whereas the interpreter will just 452 // increment the count. Detect this case. 453 if (morphism == 1 && count > 0) { 454 epsilon = count; 455 count = 0; 456 } 457 } 458 for (uint i = 0; i < call->row_limit(); i++) { 459 ciKlass* receiver = call->receiver(i); 460 if (receiver == NULL) continue; 461 int rcount = call->receiver_count(i) + epsilon; 462 if (rcount == 0) rcount = 1; // Should be valid value 463 receivers_count_total += rcount; 464 // Add the receiver to result data. 465 result.add_receiver(receiver, rcount); 466 // If we extend profiling to record methods, 467 // we will set result._method also. 468 } 469 // Determine call site's morphism. 470 // The call site count is 0 with known morphism (onlt 1 or 2 receivers) 471 // or < 0 in the case of a type check failured for checkcast, aastore, instanceof. 472 // The call site count is > 0 in the case of a polymorphic virtual call. 473 if (morphism > 0 && morphism == result._limit) { 474 // The morphism <= MorphismLimit. 475 if ((morphism < ciCallProfile::MorphismLimit) || 476 (morphism == ciCallProfile::MorphismLimit && count == 0)) { 477 #ifdef ASSERT 478 if (count > 0) { 479 this->print_short_name(tty); 480 tty->print_cr(" @ bci:%d", bci); 481 this->print_codes(); 482 assert(false, "this call site should not be polymorphic"); 483 } 484 #endif 485 result._morphism = morphism; 486 } 487 } 488 // Make the count consistent if this is a call profile. If count is 489 // zero or less, presume that this is a typecheck profile and 490 // do nothing. Otherwise, increase count to be the sum of all 491 // receiver's counts. 492 if (count >= 0) { 493 count += receivers_count_total; 494 } 495 } 496 result._count = count; 497 } 498 } 499 return result; 500 } 501 502 // ------------------------------------------------------------------ 503 // Add new receiver and sort data by receiver's profile count. 504 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) { 505 // Add new receiver and sort data by receiver's counts when we have space 506 // for it otherwise replace the less called receiver (less called receiver 507 // is placed to the last array element which is not used). 508 // First array's element contains most called receiver. 509 int i = _limit; 510 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) { 511 _receiver[i] = _receiver[i-1]; 512 _receiver_count[i] = _receiver_count[i-1]; 513 } 514 _receiver[i] = receiver; 515 _receiver_count[i] = receiver_count; 516 if (_limit < MorphismLimit) _limit++; 517 } 518 519 // ------------------------------------------------------------------ 520 // ciMethod::find_monomorphic_target 521 // 522 // Given a certain calling environment, find the monomorphic target 523 // for the call. Return NULL if the call is not monomorphic in 524 // its calling environment, or if there are only abstract methods. 525 // The returned method is never abstract. 526 // Note: If caller uses a non-null result, it must inform dependencies 527 // via assert_unique_concrete_method or assert_leaf_type. 528 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller, 529 ciInstanceKlass* callee_holder, 530 ciInstanceKlass* actual_recv) { 531 check_is_loaded(); 532 533 if (actual_recv->is_interface()) { 534 // %%% We cannot trust interface types, yet. See bug 6312651. 535 return NULL; 536 } 537 538 ciMethod* root_m = resolve_invoke(caller, actual_recv); 539 if (root_m == NULL) { 540 // Something went wrong looking up the actual receiver method. 541 return NULL; 542 } 543 assert(!root_m->is_abstract(), "resolve_invoke promise"); 544 545 // Make certain quick checks even if UseCHA is false. 546 547 // Is it private or final? 548 if (root_m->can_be_statically_bound()) { 549 return root_m; 550 } 551 552 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) { 553 // Easy case. There is no other place to put a method, so don't bother 554 // to go through the VM_ENTRY_MARK and all the rest. 555 return root_m; 556 } 557 558 // Array methods (clone, hashCode, etc.) are always statically bound. 559 // If we were to see an array type here, we'd return root_m. 560 // However, this method processes only ciInstanceKlasses. (See 4962591.) 561 // The inline_native_clone intrinsic narrows Object to T[] properly, 562 // so there is no need to do the same job here. 563 564 if (!UseCHA) return NULL; 565 566 VM_ENTRY_MARK; 567 568 methodHandle target; 569 { 570 MutexLocker locker(Compile_lock); 571 klassOop context = actual_recv->get_klassOop(); 572 target = Dependencies::find_unique_concrete_method(context, 573 root_m->get_methodOop()); 574 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods. 575 } 576 577 #ifndef PRODUCT 578 if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) { 579 tty->print("found a non-root unique target method"); 580 tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name()); 581 tty->print(" method = "); 582 target->print_short_name(tty); 583 tty->cr(); 584 } 585 #endif //PRODUCT 586 587 if (target() == NULL) { 588 return NULL; 589 } 590 if (target() == root_m->get_methodOop()) { 591 return root_m; 592 } 593 if (!root_m->is_public() && 594 !root_m->is_protected()) { 595 // If we are going to reason about inheritance, it's easiest 596 // if the method in question is public, protected, or private. 597 // If the answer is not root_m, it is conservatively correct 598 // to return NULL, even if the CHA encountered irrelevant 599 // methods in other packages. 600 // %%% TO DO: Work out logic for package-private methods 601 // with the same name but different vtable indexes. 602 return NULL; 603 } 604 return CURRENT_THREAD_ENV->get_object(target())->as_method(); 605 } 606 607 // ------------------------------------------------------------------ 608 // ciMethod::resolve_invoke 609 // 610 // Given a known receiver klass, find the target for the call. 611 // Return NULL if the call has no target or the target is abstract. 612 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) { 613 check_is_loaded(); 614 VM_ENTRY_MARK; 615 616 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 617 KlassHandle h_recv (THREAD, exact_receiver->get_klassOop()); 618 KlassHandle h_resolved (THREAD, holder()->get_klassOop()); 619 symbolHandle h_name (THREAD, name()->get_symbolOop()); 620 symbolHandle h_signature (THREAD, signature()->get_symbolOop()); 621 622 methodHandle m; 623 // Only do exact lookup if receiver klass has been linked. Otherwise, 624 // the vtable has not been setup, and the LinkResolver will fail. 625 if (h_recv->oop_is_javaArray() 626 || 627 instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) { 628 if (holder()->is_interface()) { 629 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 630 } else { 631 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 632 } 633 } 634 635 if (m.is_null()) { 636 // Return NULL only if there was a problem with lookup (uninitialized class, etc.) 637 return NULL; 638 } 639 640 ciMethod* result = this; 641 if (m() != get_methodOop()) { 642 result = CURRENT_THREAD_ENV->get_object(m())->as_method(); 643 } 644 645 // Don't return abstract methods because they aren't 646 // optimizable or interesting. 647 if (result->is_abstract()) { 648 return NULL; 649 } else { 650 return result; 651 } 652 } 653 654 // ------------------------------------------------------------------ 655 // ciMethod::resolve_vtable_index 656 // 657 // Given a known receiver klass, find the vtable index for the call. 658 // Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown. 659 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) { 660 check_is_loaded(); 661 662 int vtable_index = methodOopDesc::invalid_vtable_index; 663 // Only do lookup if receiver klass has been linked. Otherwise, 664 // the vtable has not been setup, and the LinkResolver will fail. 665 if (!receiver->is_interface() 666 && (!receiver->is_instance_klass() || 667 receiver->as_instance_klass()->is_linked())) { 668 VM_ENTRY_MARK; 669 670 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 671 KlassHandle h_recv (THREAD, receiver->get_klassOop()); 672 symbolHandle h_name (THREAD, name()->get_symbolOop()); 673 symbolHandle h_signature (THREAD, signature()->get_symbolOop()); 674 675 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass); 676 if (vtable_index == methodOopDesc::nonvirtual_vtable_index) { 677 // A statically bound method. Return "no such index". 678 vtable_index = methodOopDesc::invalid_vtable_index; 679 } 680 } 681 682 return vtable_index; 683 } 684 685 // ------------------------------------------------------------------ 686 // ciMethod::interpreter_call_site_count 687 int ciMethod::interpreter_call_site_count(int bci) { 688 if (method_data() != NULL) { 689 ResourceMark rm; 690 ciProfileData* data = method_data()->bci_to_data(bci); 691 if (data != NULL && data->is_CounterData()) { 692 return scale_count(data->as_CounterData()->count()); 693 } 694 } 695 return -1; // unknown 696 } 697 698 // ------------------------------------------------------------------ 699 // Adjust a CounterData count to be commensurate with 700 // interpreter_invocation_count. If the MDO exists for 701 // only 25% of the time the method exists, then the 702 // counts in the MDO should be scaled by 4X, so that 703 // they can be usefully and stably compared against the 704 // invocation counts in methods. 705 int ciMethod::scale_count(int count, float prof_factor) { 706 if (count > 0 && method_data() != NULL) { 707 int counter_life; 708 int method_life = interpreter_invocation_count(); 709 if (TieredCompilation) { 710 // In tiered the MDO's life is measured directly, so just use the snapshotted counters 711 counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count()); 712 } else { 713 int current_mileage = method_data()->current_mileage(); 714 int creation_mileage = method_data()->creation_mileage(); 715 counter_life = current_mileage - creation_mileage; 716 } 717 718 // counter_life due to backedge_counter could be > method_life 719 if (counter_life > method_life) 720 counter_life = method_life; 721 if (0 < counter_life && counter_life <= method_life) { 722 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5); 723 count = (count > 0) ? count : 1; 724 } 725 } 726 return count; 727 } 728 729 // ------------------------------------------------------------------ 730 // invokedynamic support 731 732 // ------------------------------------------------------------------ 733 // ciMethod::is_method_handle_invoke 734 // 735 // Return true if the method is an instance of one of the two 736 // signature-polymorphic MethodHandle methods, invokeExact or invokeGeneric. 737 bool ciMethod::is_method_handle_invoke() const { 738 if (!is_loaded()) { 739 bool flag = (holder()->name() == ciSymbol::java_dyn_MethodHandle() && 740 methodOopDesc::is_method_handle_invoke_name(name()->sid())); 741 return flag; 742 } 743 VM_ENTRY_MARK; 744 return get_methodOop()->is_method_handle_invoke(); 745 } 746 747 // ------------------------------------------------------------------ 748 // ciMethod::is_method_handle_adapter 749 // 750 // Return true if the method is a generated MethodHandle adapter. 751 // These are built by MethodHandleCompiler. 752 bool ciMethod::is_method_handle_adapter() const { 753 if (!is_loaded()) return false; 754 VM_ENTRY_MARK; 755 return get_methodOop()->is_method_handle_adapter(); 756 } 757 758 ciInstance* ciMethod::method_handle_type() { 759 check_is_loaded(); 760 VM_ENTRY_MARK; 761 oop mtype = get_methodOop()->method_handle_type(); 762 return CURRENT_THREAD_ENV->get_object(mtype)->as_instance(); 763 } 764 765 766 // ------------------------------------------------------------------ 767 // ciMethod::build_method_data 768 // 769 // Generate new methodDataOop objects at compile time. 770 void ciMethod::build_method_data(methodHandle h_m) { 771 EXCEPTION_CONTEXT; 772 if (is_native() || is_abstract() || h_m()->is_accessor()) return; 773 if (h_m()->method_data() == NULL) { 774 methodOopDesc::build_interpreter_method_data(h_m, THREAD); 775 if (HAS_PENDING_EXCEPTION) { 776 CLEAR_PENDING_EXCEPTION; 777 } 778 } 779 if (h_m()->method_data() != NULL) { 780 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 781 _method_data->load_data(); 782 } else { 783 _method_data = CURRENT_ENV->get_empty_methodData(); 784 } 785 } 786 787 // public, retroactive version 788 void ciMethod::build_method_data() { 789 if (_method_data == NULL || _method_data->is_empty()) { 790 GUARDED_VM_ENTRY({ 791 build_method_data(get_methodOop()); 792 }); 793 } 794 } 795 796 797 // ------------------------------------------------------------------ 798 // ciMethod::method_data 799 // 800 ciMethodData* ciMethod::method_data() { 801 if (_method_data != NULL) { 802 return _method_data; 803 } 804 VM_ENTRY_MARK; 805 ciEnv* env = CURRENT_ENV; 806 Thread* my_thread = JavaThread::current(); 807 methodHandle h_m(my_thread, get_methodOop()); 808 809 // Create an MDO for the inlinee 810 if (TieredCompilation && is_c1_compile(env->comp_level())) { 811 build_method_data(h_m); 812 } 813 814 if (h_m()->method_data() != NULL) { 815 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 816 _method_data->load_data(); 817 } else { 818 _method_data = CURRENT_ENV->get_empty_methodData(); 819 } 820 return _method_data; 821 822 } 823 824 825 // ------------------------------------------------------------------ 826 // ciMethod::will_link 827 // 828 // Will this method link in a specific calling context? 829 bool ciMethod::will_link(ciKlass* accessing_klass, 830 ciKlass* declared_method_holder, 831 Bytecodes::Code bc) { 832 if (!is_loaded()) { 833 // Method lookup failed. 834 return false; 835 } 836 837 // The link checks have been front-loaded into the get_method 838 // call. This method (ciMethod::will_link()) will be removed 839 // in the future. 840 841 return true; 842 } 843 844 // ------------------------------------------------------------------ 845 // ciMethod::should_exclude 846 // 847 // Should this method be excluded from compilation? 848 bool ciMethod::should_exclude() { 849 check_is_loaded(); 850 VM_ENTRY_MARK; 851 methodHandle mh(THREAD, get_methodOop()); 852 bool ignore; 853 return CompilerOracle::should_exclude(mh, ignore); 854 } 855 856 // ------------------------------------------------------------------ 857 // ciMethod::should_inline 858 // 859 // Should this method be inlined during compilation? 860 bool ciMethod::should_inline() { 861 check_is_loaded(); 862 VM_ENTRY_MARK; 863 methodHandle mh(THREAD, get_methodOop()); 864 return CompilerOracle::should_inline(mh); 865 } 866 867 // ------------------------------------------------------------------ 868 // ciMethod::should_not_inline 869 // 870 // Should this method be disallowed from inlining during compilation? 871 bool ciMethod::should_not_inline() { 872 check_is_loaded(); 873 VM_ENTRY_MARK; 874 methodHandle mh(THREAD, get_methodOop()); 875 return CompilerOracle::should_not_inline(mh); 876 } 877 878 // ------------------------------------------------------------------ 879 // ciMethod::should_print_assembly 880 // 881 // Should the compiler print the generated code for this method? 882 bool ciMethod::should_print_assembly() { 883 check_is_loaded(); 884 VM_ENTRY_MARK; 885 methodHandle mh(THREAD, get_methodOop()); 886 return CompilerOracle::should_print(mh); 887 } 888 889 // ------------------------------------------------------------------ 890 // ciMethod::break_at_execute 891 // 892 // Should the compiler insert a breakpoint into the generated code 893 // method? 894 bool ciMethod::break_at_execute() { 895 check_is_loaded(); 896 VM_ENTRY_MARK; 897 methodHandle mh(THREAD, get_methodOop()); 898 return CompilerOracle::should_break_at(mh); 899 } 900 901 // ------------------------------------------------------------------ 902 // ciMethod::has_option 903 // 904 bool ciMethod::has_option(const char* option) { 905 check_is_loaded(); 906 VM_ENTRY_MARK; 907 methodHandle mh(THREAD, get_methodOop()); 908 return CompilerOracle::has_option_string(mh, option); 909 } 910 911 // ------------------------------------------------------------------ 912 // ciMethod::can_be_compiled 913 // 914 // Have previous compilations of this method succeeded? 915 bool ciMethod::can_be_compiled() { 916 check_is_loaded(); 917 ciEnv* env = CURRENT_ENV; 918 if (is_c1_compile(env->comp_level())) { 919 return _is_c1_compilable; 920 } 921 return _is_c2_compilable; 922 } 923 924 // ------------------------------------------------------------------ 925 // ciMethod::set_not_compilable 926 // 927 // Tell the VM that this method cannot be compiled at all. 928 void ciMethod::set_not_compilable() { 929 check_is_loaded(); 930 VM_ENTRY_MARK; 931 ciEnv* env = CURRENT_ENV; 932 if (is_c1_compile(env->comp_level())) { 933 _is_c1_compilable = false; 934 } else { 935 _is_c2_compilable = false; 936 } 937 get_methodOop()->set_not_compilable(env->comp_level()); 938 } 939 940 // ------------------------------------------------------------------ 941 // ciMethod::can_be_osr_compiled 942 // 943 // Have previous compilations of this method succeeded? 944 // 945 // Implementation note: the VM does not currently keep track 946 // of failed OSR compilations per bci. The entry_bci parameter 947 // is currently unused. 948 bool ciMethod::can_be_osr_compiled(int entry_bci) { 949 check_is_loaded(); 950 VM_ENTRY_MARK; 951 ciEnv* env = CURRENT_ENV; 952 return !get_methodOop()->is_not_osr_compilable(env->comp_level()); 953 } 954 955 // ------------------------------------------------------------------ 956 // ciMethod::has_compiled_code 957 bool ciMethod::has_compiled_code() { 958 VM_ENTRY_MARK; 959 return get_methodOop()->code() != NULL; 960 } 961 962 int ciMethod::comp_level() { 963 check_is_loaded(); 964 VM_ENTRY_MARK; 965 nmethod* nm = get_methodOop()->code(); 966 if (nm != NULL) return nm->comp_level(); 967 return 0; 968 } 969 970 // ------------------------------------------------------------------ 971 // ciMethod::instructions_size 972 // 973 // This is a rough metric for "fat" methods, compared before inlining 974 // with InlineSmallCode. The CodeBlob::code_size accessor includes 975 // junk like exception handler, stubs, and constant table, which are 976 // not highly relevant to an inlined method. So we use the more 977 // specific accessor nmethod::insts_size. 978 int ciMethod::instructions_size(int comp_level) { 979 GUARDED_VM_ENTRY( 980 nmethod* code = get_methodOop()->code(); 981 if (code != NULL && (comp_level == CompLevel_any || comp_level == code->comp_level())) { 982 return code->insts_end() - code->verified_entry_point(); 983 } 984 return 0; 985 ) 986 } 987 988 // ------------------------------------------------------------------ 989 // ciMethod::log_nmethod_identity 990 void ciMethod::log_nmethod_identity(xmlStream* log) { 991 GUARDED_VM_ENTRY( 992 nmethod* code = get_methodOop()->code(); 993 if (code != NULL) { 994 code->log_identity(log); 995 } 996 ) 997 } 998 999 // ------------------------------------------------------------------ 1000 // ciMethod::is_not_reached 1001 bool ciMethod::is_not_reached(int bci) { 1002 check_is_loaded(); 1003 VM_ENTRY_MARK; 1004 return Interpreter::is_not_reached( 1005 methodHandle(THREAD, get_methodOop()), bci); 1006 } 1007 1008 // ------------------------------------------------------------------ 1009 // ciMethod::was_never_executed 1010 bool ciMethod::was_executed_more_than(int times) { 1011 VM_ENTRY_MARK; 1012 return get_methodOop()->was_executed_more_than(times); 1013 } 1014 1015 // ------------------------------------------------------------------ 1016 // ciMethod::has_unloaded_classes_in_signature 1017 bool ciMethod::has_unloaded_classes_in_signature() { 1018 VM_ENTRY_MARK; 1019 { 1020 EXCEPTION_MARK; 1021 methodHandle m(THREAD, get_methodOop()); 1022 bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD); 1023 if( HAS_PENDING_EXCEPTION ) { 1024 CLEAR_PENDING_EXCEPTION; 1025 return true; // Declare that we may have unloaded classes 1026 } 1027 return has_unloaded; 1028 } 1029 } 1030 1031 // ------------------------------------------------------------------ 1032 // ciMethod::is_klass_loaded 1033 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 1034 VM_ENTRY_MARK; 1035 return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved); 1036 } 1037 1038 // ------------------------------------------------------------------ 1039 // ciMethod::check_call 1040 bool ciMethod::check_call(int refinfo_index, bool is_static) const { 1041 VM_ENTRY_MARK; 1042 { 1043 EXCEPTION_MARK; 1044 HandleMark hm(THREAD); 1045 constantPoolHandle pool (THREAD, get_methodOop()->constants()); 1046 methodHandle spec_method; 1047 KlassHandle spec_klass; 1048 LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD); 1049 if (HAS_PENDING_EXCEPTION) { 1050 CLEAR_PENDING_EXCEPTION; 1051 return false; 1052 } else { 1053 return (spec_method->is_static() == is_static); 1054 } 1055 } 1056 return false; 1057 } 1058 1059 // ------------------------------------------------------------------ 1060 // ciMethod::print_codes 1061 // 1062 // Print the bytecodes for this method. 1063 void ciMethod::print_codes_on(outputStream* st) { 1064 check_is_loaded(); 1065 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);) 1066 } 1067 1068 1069 #define FETCH_FLAG_FROM_VM(flag_accessor) { \ 1070 check_is_loaded(); \ 1071 VM_ENTRY_MARK; \ 1072 return get_methodOop()->flag_accessor(); \ 1073 } 1074 1075 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); } 1076 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); } 1077 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); } 1078 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); } 1079 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); } 1080 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); } 1081 1082 BCEscapeAnalyzer *ciMethod::get_bcea() { 1083 #ifdef COMPILER2 1084 if (_bcea == NULL) { 1085 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL); 1086 } 1087 return _bcea; 1088 #else // COMPILER2 1089 ShouldNotReachHere(); 1090 return NULL; 1091 #endif // COMPILER2 1092 } 1093 1094 ciMethodBlocks *ciMethod::get_method_blocks() { 1095 Arena *arena = CURRENT_ENV->arena(); 1096 if (_method_blocks == NULL) { 1097 _method_blocks = new (arena) ciMethodBlocks(arena, this); 1098 } 1099 return _method_blocks; 1100 } 1101 1102 #undef FETCH_FLAG_FROM_VM 1103 1104 1105 // ------------------------------------------------------------------ 1106 // ciMethod::print_codes 1107 // 1108 // Print a range of the bytecodes for this method. 1109 void ciMethod::print_codes_on(int from, int to, outputStream* st) { 1110 check_is_loaded(); 1111 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);) 1112 } 1113 1114 // ------------------------------------------------------------------ 1115 // ciMethod::print_name 1116 // 1117 // Print the name of this method, including signature and some flags. 1118 void ciMethod::print_name(outputStream* st) { 1119 check_is_loaded(); 1120 GUARDED_VM_ENTRY(get_methodOop()->print_name(st);) 1121 } 1122 1123 // ------------------------------------------------------------------ 1124 // ciMethod::print_short_name 1125 // 1126 // Print the name of this method, without signature. 1127 void ciMethod::print_short_name(outputStream* st) { 1128 check_is_loaded(); 1129 GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);) 1130 } 1131 1132 // ------------------------------------------------------------------ 1133 // ciMethod::print_impl 1134 // 1135 // Implementation of the print method. 1136 void ciMethod::print_impl(outputStream* st) { 1137 ciObject::print_impl(st); 1138 st->print(" name="); 1139 name()->print_symbol_on(st); 1140 st->print(" holder="); 1141 holder()->print_name_on(st); 1142 st->print(" signature="); 1143 signature()->as_symbol()->print_symbol_on(st); 1144 if (is_loaded()) { 1145 st->print(" loaded=true flags="); 1146 flags().print_member_flags(st); 1147 } else { 1148 st->print(" loaded=false"); 1149 } 1150 }