1 /* 2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "ci/ciCallProfile.hpp" 27 #include "ci/ciExceptionHandler.hpp" 28 #include "ci/ciInstanceKlass.hpp" 29 #include "ci/ciMethod.hpp" 30 #include "ci/ciMethodBlocks.hpp" 31 #include "ci/ciMethodData.hpp" 32 #include "ci/ciMethodKlass.hpp" 33 #include "ci/ciStreams.hpp" 34 #include "ci/ciSymbol.hpp" 35 #include "ci/ciUtilities.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "compiler/abstractCompiler.hpp" 38 #include "compiler/compilerOracle.hpp" 39 #include "compiler/methodLiveness.hpp" 40 #include "interpreter/interpreter.hpp" 41 #include "interpreter/linkResolver.hpp" 42 #include "interpreter/oopMapCache.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "memory/resourceArea.hpp" 45 #include "oops/generateOopMap.hpp" 46 #include "oops/oop.inline.hpp" 47 #include "prims/nativeLookup.hpp" 48 #include "runtime/deoptimization.hpp" 49 #include "utilities/bitMap.inline.hpp" 50 #include "utilities/xmlstream.hpp" 51 #ifdef COMPILER2 52 #include "ci/bcEscapeAnalyzer.hpp" 53 #include "ci/ciTypeFlow.hpp" 54 #include "oops/methodOop.hpp" 55 #endif 56 #ifdef SHARK 57 #include "ci/ciTypeFlow.hpp" 58 #include "oops/methodOop.hpp" 59 #endif 60 61 // ciMethod 62 // 63 // This class represents a methodOop in the HotSpot virtual 64 // machine. 65 66 67 // ------------------------------------------------------------------ 68 // ciMethod::ciMethod 69 // 70 // Loaded method. 71 ciMethod::ciMethod(methodHandle h_m) : ciObject(h_m) { 72 assert(h_m() != NULL, "no null method"); 73 74 // These fields are always filled in in loaded methods. 75 _flags = ciFlags(h_m()->access_flags()); 76 77 // Easy to compute, so fill them in now. 78 _max_stack = h_m()->max_stack(); 79 _max_locals = h_m()->max_locals(); 80 _code_size = h_m()->code_size(); 81 _intrinsic_id = h_m()->intrinsic_id(); 82 _handler_count = h_m()->exception_table()->length() / 4; 83 _uses_monitors = h_m()->access_flags().has_monitor_bytecodes(); 84 _balanced_monitors = !_uses_monitors || h_m()->access_flags().is_monitor_matching(); 85 _is_c1_compilable = !h_m()->is_not_c1_compilable(); 86 _is_c2_compilable = !h_m()->is_not_c2_compilable(); 87 // Lazy fields, filled in on demand. Require allocation. 88 _code = NULL; 89 _exception_handlers = NULL; 90 _liveness = NULL; 91 _method_blocks = NULL; 92 #if defined(COMPILER2) || defined(SHARK) 93 _flow = NULL; 94 _bcea = NULL; 95 #endif // COMPILER2 || SHARK 96 97 ciEnv *env = CURRENT_ENV; 98 if (env->jvmti_can_hotswap_or_post_breakpoint() && can_be_compiled()) { 99 // 6328518 check hotswap conditions under the right lock. 100 MutexLocker locker(Compile_lock); 101 if (Dependencies::check_evol_method(h_m()) != NULL) { 102 _is_c1_compilable = false; 103 _is_c2_compilable = false; 104 } 105 } else { 106 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 107 } 108 109 if (instanceKlass::cast(h_m()->method_holder())->is_linked()) { 110 _can_be_statically_bound = h_m()->can_be_statically_bound(); 111 } else { 112 // Have to use a conservative value in this case. 113 _can_be_statically_bound = false; 114 } 115 116 // Adjust the definition of this condition to be more useful: 117 // %%% take these conditions into account in vtable generation 118 if (!_can_be_statically_bound && h_m()->is_private()) 119 _can_be_statically_bound = true; 120 if (_can_be_statically_bound && h_m()->is_abstract()) 121 _can_be_statically_bound = false; 122 123 // generating _signature may allow GC and therefore move m. 124 // These fields are always filled in. 125 _name = env->get_symbol(h_m()->name()); 126 _holder = env->get_object(h_m()->method_holder())->as_instance_klass(); 127 ciSymbol* sig_symbol = env->get_symbol(h_m()->signature()); 128 constantPoolHandle cpool = h_m()->constants(); 129 _signature = new (env->arena()) ciSignature(_holder, cpool, sig_symbol); 130 _method_data = NULL; 131 // Take a snapshot of these values, so they will be commensurate with the MDO. 132 if (ProfileInterpreter || TieredCompilation) { 133 int invcnt = h_m()->interpreter_invocation_count(); 134 // if the value overflowed report it as max int 135 _interpreter_invocation_count = invcnt < 0 ? max_jint : invcnt ; 136 _interpreter_throwout_count = h_m()->interpreter_throwout_count(); 137 } else { 138 _interpreter_invocation_count = 0; 139 _interpreter_throwout_count = 0; 140 } 141 if (_interpreter_invocation_count == 0) 142 _interpreter_invocation_count = 1; 143 } 144 145 146 // ------------------------------------------------------------------ 147 // ciMethod::ciMethod 148 // 149 // Unloaded method. 150 ciMethod::ciMethod(ciInstanceKlass* holder, 151 ciSymbol* name, 152 ciSymbol* signature, 153 ciInstanceKlass* accessor) : 154 ciObject(ciMethodKlass::make()), 155 _name( name), 156 _holder( holder), 157 _intrinsic_id( vmIntrinsics::_none), 158 _liveness( NULL), 159 _can_be_statically_bound(false), 160 _method_blocks( NULL), 161 _method_data( NULL) 162 #if defined(COMPILER2) || defined(SHARK) 163 , 164 _flow( NULL), 165 _bcea( NULL) 166 #endif // COMPILER2 || SHARK 167 { 168 // Usually holder and accessor are the same type but in some cases 169 // the holder has the wrong class loader (e.g. invokedynamic call 170 // sites) so we pass the accessor. 171 _signature = new (CURRENT_ENV->arena()) ciSignature(accessor, constantPoolHandle(), signature); 172 } 173 174 175 // ------------------------------------------------------------------ 176 // ciMethod::load_code 177 // 178 // Load the bytecodes and exception handler table for this method. 179 void ciMethod::load_code() { 180 VM_ENTRY_MARK; 181 assert(is_loaded(), "only loaded methods have code"); 182 183 methodOop me = get_methodOop(); 184 Arena* arena = CURRENT_THREAD_ENV->arena(); 185 186 // Load the bytecodes. 187 _code = (address)arena->Amalloc(code_size()); 188 memcpy(_code, me->code_base(), code_size()); 189 190 // Revert any breakpoint bytecodes in ci's copy 191 if (me->number_of_breakpoints() > 0) { 192 BreakpointInfo* bp = instanceKlass::cast(me->method_holder())->breakpoints(); 193 for (; bp != NULL; bp = bp->next()) { 194 if (bp->match(me)) { 195 code_at_put(bp->bci(), bp->orig_bytecode()); 196 } 197 } 198 } 199 200 // And load the exception table. 201 typeArrayOop exc_table = me->exception_table(); 202 203 // Allocate one extra spot in our list of exceptions. This 204 // last entry will be used to represent the possibility that 205 // an exception escapes the method. See ciExceptionHandlerStream 206 // for details. 207 _exception_handlers = 208 (ciExceptionHandler**)arena->Amalloc(sizeof(ciExceptionHandler*) 209 * (_handler_count + 1)); 210 if (_handler_count > 0) { 211 for (int i=0; i<_handler_count; i++) { 212 int base = i*4; 213 _exception_handlers[i] = new (arena) ciExceptionHandler( 214 holder(), 215 /* start */ exc_table->int_at(base), 216 /* limit */ exc_table->int_at(base+1), 217 /* goto pc */ exc_table->int_at(base+2), 218 /* cp index */ exc_table->int_at(base+3)); 219 } 220 } 221 222 // Put an entry at the end of our list to represent the possibility 223 // of exceptional exit. 224 _exception_handlers[_handler_count] = 225 new (arena) ciExceptionHandler(holder(), 0, code_size(), -1, 0); 226 227 if (CIPrintMethodCodes) { 228 print_codes(); 229 } 230 } 231 232 233 // ------------------------------------------------------------------ 234 // ciMethod::has_linenumber_table 235 // 236 // length unknown until decompression 237 bool ciMethod::has_linenumber_table() const { 238 check_is_loaded(); 239 VM_ENTRY_MARK; 240 return get_methodOop()->has_linenumber_table(); 241 } 242 243 244 // ------------------------------------------------------------------ 245 // ciMethod::compressed_linenumber_table 246 u_char* ciMethod::compressed_linenumber_table() const { 247 check_is_loaded(); 248 VM_ENTRY_MARK; 249 return get_methodOop()->compressed_linenumber_table(); 250 } 251 252 253 // ------------------------------------------------------------------ 254 // ciMethod::line_number_from_bci 255 int ciMethod::line_number_from_bci(int bci) const { 256 check_is_loaded(); 257 VM_ENTRY_MARK; 258 return get_methodOop()->line_number_from_bci(bci); 259 } 260 261 262 // ------------------------------------------------------------------ 263 // ciMethod::vtable_index 264 // 265 // Get the position of this method's entry in the vtable, if any. 266 int ciMethod::vtable_index() { 267 check_is_loaded(); 268 assert(holder()->is_linked(), "must be linked"); 269 VM_ENTRY_MARK; 270 return get_methodOop()->vtable_index(); 271 } 272 273 274 #ifdef SHARK 275 // ------------------------------------------------------------------ 276 // ciMethod::itable_index 277 // 278 // Get the position of this method's entry in the itable, if any. 279 int ciMethod::itable_index() { 280 check_is_loaded(); 281 assert(holder()->is_linked(), "must be linked"); 282 VM_ENTRY_MARK; 283 return klassItable::compute_itable_index(get_methodOop()); 284 } 285 #endif // SHARK 286 287 288 // ------------------------------------------------------------------ 289 // ciMethod::native_entry 290 // 291 // Get the address of this method's native code, if any. 292 address ciMethod::native_entry() { 293 check_is_loaded(); 294 assert(flags().is_native(), "must be native method"); 295 VM_ENTRY_MARK; 296 methodOop method = get_methodOop(); 297 address entry = method->native_function(); 298 assert(entry != NULL, "must be valid entry point"); 299 return entry; 300 } 301 302 303 // ------------------------------------------------------------------ 304 // ciMethod::interpreter_entry 305 // 306 // Get the entry point for running this method in the interpreter. 307 address ciMethod::interpreter_entry() { 308 check_is_loaded(); 309 VM_ENTRY_MARK; 310 methodHandle mh(THREAD, get_methodOop()); 311 return Interpreter::entry_for_method(mh); 312 } 313 314 315 // ------------------------------------------------------------------ 316 // ciMethod::uses_balanced_monitors 317 // 318 // Does this method use monitors in a strict stack-disciplined manner? 319 bool ciMethod::has_balanced_monitors() { 320 check_is_loaded(); 321 if (_balanced_monitors) return true; 322 323 // Analyze the method to see if monitors are used properly. 324 VM_ENTRY_MARK; 325 methodHandle method(THREAD, get_methodOop()); 326 assert(method->has_monitor_bytecodes(), "should have checked this"); 327 328 // Check to see if a previous compilation computed the 329 // monitor-matching analysis. 330 if (method->guaranteed_monitor_matching()) { 331 _balanced_monitors = true; 332 return true; 333 } 334 335 { 336 EXCEPTION_MARK; 337 ResourceMark rm(THREAD); 338 GeneratePairingInfo gpi(method); 339 gpi.compute_map(CATCH); 340 if (!gpi.monitor_safe()) { 341 return false; 342 } 343 method->set_guaranteed_monitor_matching(); 344 _balanced_monitors = true; 345 } 346 return true; 347 } 348 349 350 // ------------------------------------------------------------------ 351 // ciMethod::get_flow_analysis 352 ciTypeFlow* ciMethod::get_flow_analysis() { 353 #if defined(COMPILER2) || defined(SHARK) 354 if (_flow == NULL) { 355 ciEnv* env = CURRENT_ENV; 356 _flow = new (env->arena()) ciTypeFlow(env, this); 357 _flow->do_flow(); 358 } 359 return _flow; 360 #else // COMPILER2 || SHARK 361 ShouldNotReachHere(); 362 return NULL; 363 #endif // COMPILER2 || SHARK 364 } 365 366 367 // ------------------------------------------------------------------ 368 // ciMethod::get_osr_flow_analysis 369 ciTypeFlow* ciMethod::get_osr_flow_analysis(int osr_bci) { 370 #if defined(COMPILER2) || defined(SHARK) 371 // OSR entry points are always place after a call bytecode of some sort 372 assert(osr_bci >= 0, "must supply valid OSR entry point"); 373 ciEnv* env = CURRENT_ENV; 374 ciTypeFlow* flow = new (env->arena()) ciTypeFlow(env, this, osr_bci); 375 flow->do_flow(); 376 return flow; 377 #else // COMPILER2 || SHARK 378 ShouldNotReachHere(); 379 return NULL; 380 #endif // COMPILER2 || SHARK 381 } 382 383 // ------------------------------------------------------------------ 384 // ciMethod::raw_liveness_at_bci 385 // 386 // Which local variables are live at a specific bci? 387 MethodLivenessResult ciMethod::raw_liveness_at_bci(int bci) { 388 check_is_loaded(); 389 if (_liveness == NULL) { 390 // Create the liveness analyzer. 391 Arena* arena = CURRENT_ENV->arena(); 392 _liveness = new (arena) MethodLiveness(arena, this); 393 _liveness->compute_liveness(); 394 } 395 return _liveness->get_liveness_at(bci); 396 } 397 398 // ------------------------------------------------------------------ 399 // ciMethod::liveness_at_bci 400 // 401 // Which local variables are live at a specific bci? When debugging 402 // will return true for all locals in some cases to improve debug 403 // information. 404 MethodLivenessResult ciMethod::liveness_at_bci(int bci) { 405 MethodLivenessResult result = raw_liveness_at_bci(bci); 406 if (CURRENT_ENV->jvmti_can_access_local_variables() || DeoptimizeALot || CompileTheWorld) { 407 // Keep all locals live for the user's edification and amusement. 408 result.at_put_range(0, result.size(), true); 409 } 410 return result; 411 } 412 413 // ciMethod::live_local_oops_at_bci 414 // 415 // find all the live oops in the locals array for a particular bci 416 // Compute what the interpreter believes by using the interpreter 417 // oopmap generator. This is used as a double check during osr to 418 // guard against conservative result from MethodLiveness making us 419 // think a dead oop is live. MethodLiveness is conservative in the 420 // sense that it may consider locals to be live which cannot be live, 421 // like in the case where a local could contain an oop or a primitive 422 // along different paths. In that case the local must be dead when 423 // those paths merge. Since the interpreter's viewpoint is used when 424 // gc'ing an interpreter frame we need to use its viewpoint during 425 // OSR when loading the locals. 426 427 BitMap ciMethod::live_local_oops_at_bci(int bci) { 428 VM_ENTRY_MARK; 429 InterpreterOopMap mask; 430 OopMapCache::compute_one_oop_map(get_methodOop(), bci, &mask); 431 int mask_size = max_locals(); 432 BitMap result(mask_size); 433 result.clear(); 434 int i; 435 for (i = 0; i < mask_size ; i++ ) { 436 if (mask.is_oop(i)) result.set_bit(i); 437 } 438 return result; 439 } 440 441 442 #ifdef COMPILER1 443 // ------------------------------------------------------------------ 444 // ciMethod::bci_block_start 445 // 446 // Marks all bcis where a new basic block starts 447 const BitMap ciMethod::bci_block_start() { 448 check_is_loaded(); 449 if (_liveness == NULL) { 450 // Create the liveness analyzer. 451 Arena* arena = CURRENT_ENV->arena(); 452 _liveness = new (arena) MethodLiveness(arena, this); 453 _liveness->compute_liveness(); 454 } 455 456 return _liveness->get_bci_block_start(); 457 } 458 #endif // COMPILER1 459 460 461 // ------------------------------------------------------------------ 462 // ciMethod::call_profile_at_bci 463 // 464 // Get the ciCallProfile for the invocation of this method. 465 // Also reports receiver types for non-call type checks (if TypeProfileCasts). 466 ciCallProfile ciMethod::call_profile_at_bci(int bci) { 467 ResourceMark rm; 468 ciCallProfile result; 469 if (method_data() != NULL && method_data()->is_mature()) { 470 ciProfileData* data = method_data()->bci_to_data(bci); 471 if (data != NULL && data->is_CounterData()) { 472 // Every profiled call site has a counter. 473 int count = data->as_CounterData()->count(); 474 475 if (!data->is_ReceiverTypeData()) { 476 result._receiver_count[0] = 0; // that's a definite zero 477 } else { // ReceiverTypeData is a subclass of CounterData 478 ciReceiverTypeData* call = (ciReceiverTypeData*)data->as_ReceiverTypeData(); 479 // In addition, virtual call sites have receiver type information 480 int receivers_count_total = 0; 481 int morphism = 0; 482 // Precompute morphism for the possible fixup 483 for (uint i = 0; i < call->row_limit(); i++) { 484 ciKlass* receiver = call->receiver(i); 485 if (receiver == NULL) continue; 486 morphism++; 487 } 488 int epsilon = 0; 489 if (TieredCompilation && ProfileInterpreter) { 490 // Interpreter and C1 treat final and special invokes differently. 491 // C1 will record a type, whereas the interpreter will just 492 // increment the count. Detect this case. 493 if (morphism == 1 && count > 0) { 494 epsilon = count; 495 count = 0; 496 } 497 } 498 for (uint i = 0; i < call->row_limit(); i++) { 499 ciKlass* receiver = call->receiver(i); 500 if (receiver == NULL) continue; 501 int rcount = call->receiver_count(i) + epsilon; 502 if (rcount == 0) rcount = 1; // Should be valid value 503 receivers_count_total += rcount; 504 // Add the receiver to result data. 505 result.add_receiver(receiver, rcount); 506 // If we extend profiling to record methods, 507 // we will set result._method also. 508 } 509 // Determine call site's morphism. 510 // The call site count is 0 with known morphism (onlt 1 or 2 receivers) 511 // or < 0 in the case of a type check failured for checkcast, aastore, instanceof. 512 // The call site count is > 0 in the case of a polymorphic virtual call. 513 if (morphism > 0 && morphism == result._limit) { 514 // The morphism <= MorphismLimit. 515 if ((morphism < ciCallProfile::MorphismLimit) || 516 (morphism == ciCallProfile::MorphismLimit && count == 0)) { 517 #ifdef ASSERT 518 if (count > 0) { 519 this->print_short_name(tty); 520 tty->print_cr(" @ bci:%d", bci); 521 this->print_codes(); 522 assert(false, "this call site should not be polymorphic"); 523 } 524 #endif 525 result._morphism = morphism; 526 } 527 } 528 // Make the count consistent if this is a call profile. If count is 529 // zero or less, presume that this is a typecheck profile and 530 // do nothing. Otherwise, increase count to be the sum of all 531 // receiver's counts. 532 if (count >= 0) { 533 count += receivers_count_total; 534 } 535 } 536 result._count = count; 537 } 538 } 539 return result; 540 } 541 542 // ------------------------------------------------------------------ 543 // Add new receiver and sort data by receiver's profile count. 544 void ciCallProfile::add_receiver(ciKlass* receiver, int receiver_count) { 545 // Add new receiver and sort data by receiver's counts when we have space 546 // for it otherwise replace the less called receiver (less called receiver 547 // is placed to the last array element which is not used). 548 // First array's element contains most called receiver. 549 int i = _limit; 550 for (; i > 0 && receiver_count > _receiver_count[i-1]; i--) { 551 _receiver[i] = _receiver[i-1]; 552 _receiver_count[i] = _receiver_count[i-1]; 553 } 554 _receiver[i] = receiver; 555 _receiver_count[i] = receiver_count; 556 if (_limit < MorphismLimit) _limit++; 557 } 558 559 // ------------------------------------------------------------------ 560 // ciMethod::find_monomorphic_target 561 // 562 // Given a certain calling environment, find the monomorphic target 563 // for the call. Return NULL if the call is not monomorphic in 564 // its calling environment, or if there are only abstract methods. 565 // The returned method is never abstract. 566 // Note: If caller uses a non-null result, it must inform dependencies 567 // via assert_unique_concrete_method or assert_leaf_type. 568 ciMethod* ciMethod::find_monomorphic_target(ciInstanceKlass* caller, 569 ciInstanceKlass* callee_holder, 570 ciInstanceKlass* actual_recv) { 571 check_is_loaded(); 572 573 if (actual_recv->is_interface()) { 574 // %%% We cannot trust interface types, yet. See bug 6312651. 575 return NULL; 576 } 577 578 ciMethod* root_m = resolve_invoke(caller, actual_recv); 579 if (root_m == NULL) { 580 // Something went wrong looking up the actual receiver method. 581 return NULL; 582 } 583 assert(!root_m->is_abstract(), "resolve_invoke promise"); 584 585 // Make certain quick checks even if UseCHA is false. 586 587 // Is it private or final? 588 if (root_m->can_be_statically_bound()) { 589 return root_m; 590 } 591 592 if (actual_recv->is_leaf_type() && actual_recv == root_m->holder()) { 593 // Easy case. There is no other place to put a method, so don't bother 594 // to go through the VM_ENTRY_MARK and all the rest. 595 return root_m; 596 } 597 598 // Array methods (clone, hashCode, etc.) are always statically bound. 599 // If we were to see an array type here, we'd return root_m. 600 // However, this method processes only ciInstanceKlasses. (See 4962591.) 601 // The inline_native_clone intrinsic narrows Object to T[] properly, 602 // so there is no need to do the same job here. 603 604 if (!UseCHA) return NULL; 605 606 VM_ENTRY_MARK; 607 608 methodHandle target; 609 { 610 MutexLocker locker(Compile_lock); 611 klassOop context = actual_recv->get_klassOop(); 612 target = Dependencies::find_unique_concrete_method(context, 613 root_m->get_methodOop()); 614 // %%% Should upgrade this ciMethod API to look for 1 or 2 concrete methods. 615 } 616 617 #ifndef PRODUCT 618 if (TraceDependencies && target() != NULL && target() != root_m->get_methodOop()) { 619 tty->print("found a non-root unique target method"); 620 tty->print_cr(" context = %s", instanceKlass::cast(actual_recv->get_klassOop())->external_name()); 621 tty->print(" method = "); 622 target->print_short_name(tty); 623 tty->cr(); 624 } 625 #endif //PRODUCT 626 627 if (target() == NULL) { 628 return NULL; 629 } 630 if (target() == root_m->get_methodOop()) { 631 return root_m; 632 } 633 if (!root_m->is_public() && 634 !root_m->is_protected()) { 635 // If we are going to reason about inheritance, it's easiest 636 // if the method in question is public, protected, or private. 637 // If the answer is not root_m, it is conservatively correct 638 // to return NULL, even if the CHA encountered irrelevant 639 // methods in other packages. 640 // %%% TO DO: Work out logic for package-private methods 641 // with the same name but different vtable indexes. 642 return NULL; 643 } 644 return CURRENT_THREAD_ENV->get_object(target())->as_method(); 645 } 646 647 // ------------------------------------------------------------------ 648 // ciMethod::resolve_invoke 649 // 650 // Given a known receiver klass, find the target for the call. 651 // Return NULL if the call has no target or the target is abstract. 652 ciMethod* ciMethod::resolve_invoke(ciKlass* caller, ciKlass* exact_receiver) { 653 check_is_loaded(); 654 VM_ENTRY_MARK; 655 656 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 657 KlassHandle h_recv (THREAD, exact_receiver->get_klassOop()); 658 KlassHandle h_resolved (THREAD, holder()->get_klassOop()); 659 Symbol* h_name = name()->get_symbol(); 660 Symbol* h_signature = signature()->get_symbol(); 661 662 methodHandle m; 663 // Only do exact lookup if receiver klass has been linked. Otherwise, 664 // the vtable has not been setup, and the LinkResolver will fail. 665 if (h_recv->oop_is_javaArray() 666 || 667 instanceKlass::cast(h_recv())->is_linked() && !exact_receiver->is_interface()) { 668 if (holder()->is_interface()) { 669 m = LinkResolver::resolve_interface_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 670 } else { 671 m = LinkResolver::resolve_virtual_call_or_null(h_recv, h_resolved, h_name, h_signature, caller_klass); 672 } 673 } 674 675 if (m.is_null()) { 676 // Return NULL only if there was a problem with lookup (uninitialized class, etc.) 677 return NULL; 678 } 679 680 ciMethod* result = this; 681 if (m() != get_methodOop()) { 682 result = CURRENT_THREAD_ENV->get_object(m())->as_method(); 683 } 684 685 // Don't return abstract methods because they aren't 686 // optimizable or interesting. 687 if (result->is_abstract()) { 688 return NULL; 689 } else { 690 return result; 691 } 692 } 693 694 // ------------------------------------------------------------------ 695 // ciMethod::resolve_vtable_index 696 // 697 // Given a known receiver klass, find the vtable index for the call. 698 // Return methodOopDesc::invalid_vtable_index if the vtable_index is unknown. 699 int ciMethod::resolve_vtable_index(ciKlass* caller, ciKlass* receiver) { 700 check_is_loaded(); 701 702 int vtable_index = methodOopDesc::invalid_vtable_index; 703 // Only do lookup if receiver klass has been linked. Otherwise, 704 // the vtable has not been setup, and the LinkResolver will fail. 705 if (!receiver->is_interface() 706 && (!receiver->is_instance_klass() || 707 receiver->as_instance_klass()->is_linked())) { 708 VM_ENTRY_MARK; 709 710 KlassHandle caller_klass (THREAD, caller->get_klassOop()); 711 KlassHandle h_recv (THREAD, receiver->get_klassOop()); 712 Symbol* h_name = name()->get_symbol(); 713 Symbol* h_signature = signature()->get_symbol(); 714 715 vtable_index = LinkResolver::resolve_virtual_vtable_index(h_recv, h_recv, h_name, h_signature, caller_klass); 716 if (vtable_index == methodOopDesc::nonvirtual_vtable_index) { 717 // A statically bound method. Return "no such index". 718 vtable_index = methodOopDesc::invalid_vtable_index; 719 } 720 } 721 722 return vtable_index; 723 } 724 725 // ------------------------------------------------------------------ 726 // ciMethod::interpreter_call_site_count 727 int ciMethod::interpreter_call_site_count(int bci) { 728 if (method_data() != NULL) { 729 ResourceMark rm; 730 ciProfileData* data = method_data()->bci_to_data(bci); 731 if (data != NULL && data->is_CounterData()) { 732 return scale_count(data->as_CounterData()->count()); 733 } 734 } 735 return -1; // unknown 736 } 737 738 // ------------------------------------------------------------------ 739 // Adjust a CounterData count to be commensurate with 740 // interpreter_invocation_count. If the MDO exists for 741 // only 25% of the time the method exists, then the 742 // counts in the MDO should be scaled by 4X, so that 743 // they can be usefully and stably compared against the 744 // invocation counts in methods. 745 int ciMethod::scale_count(int count, float prof_factor) { 746 if (count > 0 && method_data() != NULL) { 747 int counter_life; 748 int method_life = interpreter_invocation_count(); 749 if (TieredCompilation) { 750 // In tiered the MDO's life is measured directly, so just use the snapshotted counters 751 counter_life = MAX2(method_data()->invocation_count(), method_data()->backedge_count()); 752 } else { 753 int current_mileage = method_data()->current_mileage(); 754 int creation_mileage = method_data()->creation_mileage(); 755 counter_life = current_mileage - creation_mileage; 756 } 757 758 // counter_life due to backedge_counter could be > method_life 759 if (counter_life > method_life) 760 counter_life = method_life; 761 if (0 < counter_life && counter_life <= method_life) { 762 count = (int)((double)count * prof_factor * method_life / counter_life + 0.5); 763 count = (count > 0) ? count : 1; 764 } 765 } 766 return count; 767 } 768 769 // ------------------------------------------------------------------ 770 // invokedynamic support 771 772 // ------------------------------------------------------------------ 773 // ciMethod::is_method_handle_invoke 774 // 775 // Return true if the method is an instance of one of the two 776 // signature-polymorphic MethodHandle methods, invokeExact or invokeGeneric. 777 bool ciMethod::is_method_handle_invoke() const { 778 if (!is_loaded()) { 779 bool flag = (holder()->name() == ciSymbol::java_lang_invoke_MethodHandle() && 780 methodOopDesc::is_method_handle_invoke_name(name()->sid())); 781 return flag; 782 } 783 VM_ENTRY_MARK; 784 return get_methodOop()->is_method_handle_invoke(); 785 } 786 787 // ------------------------------------------------------------------ 788 // ciMethod::is_method_handle_adapter 789 // 790 // Return true if the method is a generated MethodHandle adapter. 791 // These are built by MethodHandleCompiler. 792 bool ciMethod::is_method_handle_adapter() const { 793 if (!is_loaded()) return false; 794 VM_ENTRY_MARK; 795 return get_methodOop()->is_method_handle_adapter(); 796 } 797 798 ciInstance* ciMethod::method_handle_type() { 799 check_is_loaded(); 800 VM_ENTRY_MARK; 801 oop mtype = get_methodOop()->method_handle_type(); 802 return CURRENT_THREAD_ENV->get_object(mtype)->as_instance(); 803 } 804 805 806 // ------------------------------------------------------------------ 807 // ciMethod::ensure_method_data 808 // 809 // Generate new methodDataOop objects at compile time. 810 // Return true if allocation was successful or no MDO is required. 811 bool ciMethod::ensure_method_data(methodHandle h_m) { 812 EXCEPTION_CONTEXT; 813 if (is_native() || is_abstract() || h_m()->is_accessor()) return true; 814 if (h_m()->method_data() == NULL) { 815 methodOopDesc::build_interpreter_method_data(h_m, THREAD); 816 if (HAS_PENDING_EXCEPTION) { 817 CLEAR_PENDING_EXCEPTION; 818 } 819 } 820 if (h_m()->method_data() != NULL) { 821 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 822 _method_data->load_data(); 823 return true; 824 } else { 825 _method_data = CURRENT_ENV->get_empty_methodData(); 826 return false; 827 } 828 } 829 830 // public, retroactive version 831 bool ciMethod::ensure_method_data() { 832 bool result = true; 833 if (_method_data == NULL || _method_data->is_empty()) { 834 GUARDED_VM_ENTRY({ 835 result = ensure_method_data(get_methodOop()); 836 }); 837 } 838 return result; 839 } 840 841 842 // ------------------------------------------------------------------ 843 // ciMethod::method_data 844 // 845 ciMethodData* ciMethod::method_data() { 846 if (_method_data != NULL) { 847 return _method_data; 848 } 849 VM_ENTRY_MARK; 850 ciEnv* env = CURRENT_ENV; 851 Thread* my_thread = JavaThread::current(); 852 methodHandle h_m(my_thread, get_methodOop()); 853 854 if (h_m()->method_data() != NULL) { 855 _method_data = CURRENT_ENV->get_object(h_m()->method_data())->as_method_data(); 856 _method_data->load_data(); 857 } else { 858 _method_data = CURRENT_ENV->get_empty_methodData(); 859 } 860 return _method_data; 861 862 } 863 864 // ------------------------------------------------------------------ 865 // ciMethod::method_data_or_null 866 // Returns a pointer to ciMethodData if MDO exists on the VM side, 867 // NULL otherwise. 868 ciMethodData* ciMethod::method_data_or_null() { 869 ciMethodData *md = method_data(); 870 if (md->is_empty()) return NULL; 871 return md; 872 } 873 874 // ------------------------------------------------------------------ 875 // ciMethod::will_link 876 // 877 // Will this method link in a specific calling context? 878 bool ciMethod::will_link(ciKlass* accessing_klass, 879 ciKlass* declared_method_holder, 880 Bytecodes::Code bc) { 881 if (!is_loaded()) { 882 // Method lookup failed. 883 return false; 884 } 885 886 // The link checks have been front-loaded into the get_method 887 // call. This method (ciMethod::will_link()) will be removed 888 // in the future. 889 890 return true; 891 } 892 893 // ------------------------------------------------------------------ 894 // ciMethod::should_exclude 895 // 896 // Should this method be excluded from compilation? 897 bool ciMethod::should_exclude() { 898 check_is_loaded(); 899 VM_ENTRY_MARK; 900 methodHandle mh(THREAD, get_methodOop()); 901 bool ignore; 902 return CompilerOracle::should_exclude(mh, ignore); 903 } 904 905 // ------------------------------------------------------------------ 906 // ciMethod::should_inline 907 // 908 // Should this method be inlined during compilation? 909 bool ciMethod::should_inline() { 910 check_is_loaded(); 911 VM_ENTRY_MARK; 912 methodHandle mh(THREAD, get_methodOop()); 913 return CompilerOracle::should_inline(mh); 914 } 915 916 // ------------------------------------------------------------------ 917 // ciMethod::should_not_inline 918 // 919 // Should this method be disallowed from inlining during compilation? 920 bool ciMethod::should_not_inline() { 921 check_is_loaded(); 922 VM_ENTRY_MARK; 923 methodHandle mh(THREAD, get_methodOop()); 924 return CompilerOracle::should_not_inline(mh); 925 } 926 927 // ------------------------------------------------------------------ 928 // ciMethod::should_print_assembly 929 // 930 // Should the compiler print the generated code for this method? 931 bool ciMethod::should_print_assembly() { 932 check_is_loaded(); 933 VM_ENTRY_MARK; 934 methodHandle mh(THREAD, get_methodOop()); 935 return CompilerOracle::should_print(mh); 936 } 937 938 // ------------------------------------------------------------------ 939 // ciMethod::break_at_execute 940 // 941 // Should the compiler insert a breakpoint into the generated code 942 // method? 943 bool ciMethod::break_at_execute() { 944 check_is_loaded(); 945 VM_ENTRY_MARK; 946 methodHandle mh(THREAD, get_methodOop()); 947 return CompilerOracle::should_break_at(mh); 948 } 949 950 // ------------------------------------------------------------------ 951 // ciMethod::has_option 952 // 953 bool ciMethod::has_option(const char* option) { 954 check_is_loaded(); 955 VM_ENTRY_MARK; 956 methodHandle mh(THREAD, get_methodOop()); 957 return CompilerOracle::has_option_string(mh, option); 958 } 959 960 // ------------------------------------------------------------------ 961 // ciMethod::can_be_compiled 962 // 963 // Have previous compilations of this method succeeded? 964 bool ciMethod::can_be_compiled() { 965 check_is_loaded(); 966 ciEnv* env = CURRENT_ENV; 967 if (is_c1_compile(env->comp_level())) { 968 return _is_c1_compilable; 969 } 970 return _is_c2_compilable; 971 } 972 973 // ------------------------------------------------------------------ 974 // ciMethod::set_not_compilable 975 // 976 // Tell the VM that this method cannot be compiled at all. 977 void ciMethod::set_not_compilable() { 978 check_is_loaded(); 979 VM_ENTRY_MARK; 980 ciEnv* env = CURRENT_ENV; 981 if (is_c1_compile(env->comp_level())) { 982 _is_c1_compilable = false; 983 } else { 984 _is_c2_compilable = false; 985 } 986 get_methodOop()->set_not_compilable(env->comp_level()); 987 } 988 989 // ------------------------------------------------------------------ 990 // ciMethod::can_be_osr_compiled 991 // 992 // Have previous compilations of this method succeeded? 993 // 994 // Implementation note: the VM does not currently keep track 995 // of failed OSR compilations per bci. The entry_bci parameter 996 // is currently unused. 997 bool ciMethod::can_be_osr_compiled(int entry_bci) { 998 check_is_loaded(); 999 VM_ENTRY_MARK; 1000 ciEnv* env = CURRENT_ENV; 1001 return !get_methodOop()->is_not_osr_compilable(env->comp_level()); 1002 } 1003 1004 // ------------------------------------------------------------------ 1005 // ciMethod::has_compiled_code 1006 bool ciMethod::has_compiled_code() { 1007 VM_ENTRY_MARK; 1008 return get_methodOop()->code() != NULL; 1009 } 1010 1011 int ciMethod::comp_level() { 1012 check_is_loaded(); 1013 VM_ENTRY_MARK; 1014 nmethod* nm = get_methodOop()->code(); 1015 if (nm != NULL) return nm->comp_level(); 1016 return 0; 1017 } 1018 1019 int ciMethod::highest_osr_comp_level() { 1020 check_is_loaded(); 1021 VM_ENTRY_MARK; 1022 return get_methodOop()->highest_osr_comp_level(); 1023 } 1024 1025 // ------------------------------------------------------------------ 1026 // ciMethod::code_size_for_inlining 1027 // 1028 // Code size for inlining decisions. 1029 // 1030 // Don't fully count method handle adapters against inlining budgets: 1031 // the metric we use here is the number of call sites in the adapter 1032 // as they are probably the instructions which generate some code. 1033 int ciMethod::code_size_for_inlining() { 1034 check_is_loaded(); 1035 1036 // Method handle adapters 1037 if (is_method_handle_adapter()) { 1038 // Count call sites 1039 int call_site_count = 0; 1040 ciBytecodeStream iter(this); 1041 while (iter.next() != ciBytecodeStream::EOBC()) { 1042 if (Bytecodes::is_invoke(iter.cur_bc())) { 1043 call_site_count++; 1044 } 1045 } 1046 return call_site_count; 1047 } 1048 1049 // Normal method 1050 return code_size(); 1051 } 1052 1053 // ------------------------------------------------------------------ 1054 // ciMethod::instructions_size 1055 // 1056 // This is a rough metric for "fat" methods, compared before inlining 1057 // with InlineSmallCode. The CodeBlob::code_size accessor includes 1058 // junk like exception handler, stubs, and constant table, which are 1059 // not highly relevant to an inlined method. So we use the more 1060 // specific accessor nmethod::insts_size. 1061 int ciMethod::instructions_size(int comp_level) { 1062 GUARDED_VM_ENTRY( 1063 nmethod* code = get_methodOop()->code(); 1064 if (code != NULL && (comp_level == CompLevel_any || comp_level == code->comp_level())) { 1065 return code->insts_end() - code->verified_entry_point(); 1066 } 1067 return 0; 1068 ) 1069 } 1070 1071 // ------------------------------------------------------------------ 1072 // ciMethod::log_nmethod_identity 1073 void ciMethod::log_nmethod_identity(xmlStream* log) { 1074 GUARDED_VM_ENTRY( 1075 nmethod* code = get_methodOop()->code(); 1076 if (code != NULL) { 1077 code->log_identity(log); 1078 } 1079 ) 1080 } 1081 1082 // ------------------------------------------------------------------ 1083 // ciMethod::is_not_reached 1084 bool ciMethod::is_not_reached(int bci) { 1085 check_is_loaded(); 1086 VM_ENTRY_MARK; 1087 return Interpreter::is_not_reached( 1088 methodHandle(THREAD, get_methodOop()), bci); 1089 } 1090 1091 // ------------------------------------------------------------------ 1092 // ciMethod::was_never_executed 1093 bool ciMethod::was_executed_more_than(int times) { 1094 VM_ENTRY_MARK; 1095 return get_methodOop()->was_executed_more_than(times); 1096 } 1097 1098 // ------------------------------------------------------------------ 1099 // ciMethod::has_unloaded_classes_in_signature 1100 bool ciMethod::has_unloaded_classes_in_signature() { 1101 VM_ENTRY_MARK; 1102 { 1103 EXCEPTION_MARK; 1104 methodHandle m(THREAD, get_methodOop()); 1105 bool has_unloaded = methodOopDesc::has_unloaded_classes_in_signature(m, (JavaThread *)THREAD); 1106 if( HAS_PENDING_EXCEPTION ) { 1107 CLEAR_PENDING_EXCEPTION; 1108 return true; // Declare that we may have unloaded classes 1109 } 1110 return has_unloaded; 1111 } 1112 } 1113 1114 // ------------------------------------------------------------------ 1115 // ciMethod::is_klass_loaded 1116 bool ciMethod::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { 1117 VM_ENTRY_MARK; 1118 return get_methodOop()->is_klass_loaded(refinfo_index, must_be_resolved); 1119 } 1120 1121 // ------------------------------------------------------------------ 1122 // ciMethod::check_call 1123 bool ciMethod::check_call(int refinfo_index, bool is_static) const { 1124 VM_ENTRY_MARK; 1125 { 1126 EXCEPTION_MARK; 1127 HandleMark hm(THREAD); 1128 constantPoolHandle pool (THREAD, get_methodOop()->constants()); 1129 methodHandle spec_method; 1130 KlassHandle spec_klass; 1131 LinkResolver::resolve_method(spec_method, spec_klass, pool, refinfo_index, THREAD); 1132 if (HAS_PENDING_EXCEPTION) { 1133 CLEAR_PENDING_EXCEPTION; 1134 return false; 1135 } else { 1136 return (spec_method->is_static() == is_static); 1137 } 1138 } 1139 return false; 1140 } 1141 1142 // ------------------------------------------------------------------ 1143 // ciMethod::print_codes 1144 // 1145 // Print the bytecodes for this method. 1146 void ciMethod::print_codes_on(outputStream* st) { 1147 check_is_loaded(); 1148 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(st);) 1149 } 1150 1151 1152 #define FETCH_FLAG_FROM_VM(flag_accessor) { \ 1153 check_is_loaded(); \ 1154 VM_ENTRY_MARK; \ 1155 return get_methodOop()->flag_accessor(); \ 1156 } 1157 1158 bool ciMethod::is_empty_method() const { FETCH_FLAG_FROM_VM(is_empty_method); } 1159 bool ciMethod::is_vanilla_constructor() const { FETCH_FLAG_FROM_VM(is_vanilla_constructor); } 1160 bool ciMethod::has_loops () const { FETCH_FLAG_FROM_VM(has_loops); } 1161 bool ciMethod::has_jsrs () const { FETCH_FLAG_FROM_VM(has_jsrs); } 1162 bool ciMethod::is_accessor () const { FETCH_FLAG_FROM_VM(is_accessor); } 1163 bool ciMethod::is_initializer () const { FETCH_FLAG_FROM_VM(is_initializer); } 1164 1165 BCEscapeAnalyzer *ciMethod::get_bcea() { 1166 #ifdef COMPILER2 1167 if (_bcea == NULL) { 1168 _bcea = new (CURRENT_ENV->arena()) BCEscapeAnalyzer(this, NULL); 1169 } 1170 return _bcea; 1171 #else // COMPILER2 1172 ShouldNotReachHere(); 1173 return NULL; 1174 #endif // COMPILER2 1175 } 1176 1177 ciMethodBlocks *ciMethod::get_method_blocks() { 1178 Arena *arena = CURRENT_ENV->arena(); 1179 if (_method_blocks == NULL) { 1180 _method_blocks = new (arena) ciMethodBlocks(arena, this); 1181 } 1182 return _method_blocks; 1183 } 1184 1185 #undef FETCH_FLAG_FROM_VM 1186 1187 1188 // ------------------------------------------------------------------ 1189 // ciMethod::print_codes 1190 // 1191 // Print a range of the bytecodes for this method. 1192 void ciMethod::print_codes_on(int from, int to, outputStream* st) { 1193 check_is_loaded(); 1194 GUARDED_VM_ENTRY(get_methodOop()->print_codes_on(from, to, st);) 1195 } 1196 1197 // ------------------------------------------------------------------ 1198 // ciMethod::print_name 1199 // 1200 // Print the name of this method, including signature and some flags. 1201 void ciMethod::print_name(outputStream* st) { 1202 check_is_loaded(); 1203 GUARDED_VM_ENTRY(get_methodOop()->print_name(st);) 1204 } 1205 1206 // ------------------------------------------------------------------ 1207 // ciMethod::print_short_name 1208 // 1209 // Print the name of this method, without signature. 1210 void ciMethod::print_short_name(outputStream* st) { 1211 check_is_loaded(); 1212 GUARDED_VM_ENTRY(get_methodOop()->print_short_name(st);) 1213 } 1214 1215 // ------------------------------------------------------------------ 1216 // ciMethod::print_impl 1217 // 1218 // Implementation of the print method. 1219 void ciMethod::print_impl(outputStream* st) { 1220 ciObject::print_impl(st); 1221 st->print(" name="); 1222 name()->print_symbol_on(st); 1223 st->print(" holder="); 1224 holder()->print_name_on(st); 1225 st->print(" signature="); 1226 signature()->as_symbol()->print_symbol_on(st); 1227 if (is_loaded()) { 1228 st->print(" loaded=true flags="); 1229 flags().print_member_flags(st); 1230 } else { 1231 st->print(" loaded=false"); 1232 } 1233 }