1 /* 2 * Copyright (c) 1999, 2021, 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/ciCallSite.hpp" 27 #include "ci/ciInstance.hpp" 28 #include "ci/ciInstanceKlass.hpp" 29 #include "ci/ciMemberName.hpp" 30 #include "ci/ciNativeEntryPoint.hpp" 31 #include "ci/ciMethod.hpp" 32 #include "ci/ciMethodData.hpp" 33 #include "ci/ciMethodHandle.hpp" 34 #include "ci/ciMethodType.hpp" 35 #include "ci/ciNullObject.hpp" 36 #include "ci/ciObjArray.hpp" 37 #include "ci/ciObjArrayKlass.hpp" 38 #include "ci/ciObject.hpp" 39 #include "ci/ciObjectFactory.hpp" 40 #include "ci/ciSymbol.hpp" 41 #include "ci/ciSymbols.hpp" 42 #include "ci/ciTypeArray.hpp" 43 #include "ci/ciTypeArrayKlass.hpp" 44 #include "ci/ciUtilities.inline.hpp" 45 #include "classfile/javaClasses.inline.hpp" 46 #include "classfile/vmClasses.hpp" 47 #include "compiler/compiler_globals.hpp" 48 #include "gc/shared/collectedHeap.inline.hpp" 49 #include "memory/allocation.inline.hpp" 50 #include "memory/universe.hpp" 51 #include "oops/oop.inline.hpp" 52 #include "runtime/handles.inline.hpp" 53 #include "runtime/signature.hpp" 54 #include "utilities/macros.hpp" 55 56 // ciObjectFactory 57 // 58 // This class handles requests for the creation of new instances 59 // of ciObject and its subclasses. It contains a caching mechanism 60 // which ensures that for each oop, at most one ciObject is created. 61 // This invariant allows more efficient implementation of ciObject. 62 // 63 // Implementation note: the oop->ciObject mapping is represented as 64 // a table stored in an array. Even though objects are moved 65 // by the garbage collector, the compactor preserves their relative 66 // order; address comparison of oops (in perm space) is safe so long 67 // as we prohibit GC during our comparisons. We currently use binary 68 // search to find the oop in the table, and inserting a new oop 69 // into the table may be costly. If this cost ends up being 70 // problematic the underlying data structure can be switched to some 71 // sort of balanced binary tree. 72 73 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL; 74 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()]; 75 int ciObjectFactory::_shared_ident_limit = 0; 76 volatile bool ciObjectFactory::_initialized = false; 77 78 79 // ------------------------------------------------------------------ 80 // ciObjectFactory::ciObjectFactory 81 ciObjectFactory::ciObjectFactory(Arena* arena, 82 int expected_size) 83 : _arena(arena), 84 _ci_metadata(arena, expected_size, 0, NULL), 85 _unloaded_methods(arena, 4, 0, NULL), 86 _unloaded_klasses(arena, 8, 0, NULL), 87 _unloaded_instances(arena, 4, 0, NULL), 88 _return_addresses(arena, 8, 0, NULL), 89 _symbols(arena, 100, 0, NULL), 90 _next_ident(_shared_ident_limit), 91 _non_perm_count(0) { 92 for (int i = 0; i < NON_PERM_BUCKETS; i++) { 93 _non_perm_bucket[i] = NULL; 94 } 95 96 // If the shared ci objects exist append them to this factory's objects 97 if (_shared_ci_metadata != NULL) { 98 _ci_metadata.appendAll(_shared_ci_metadata); 99 } 100 } 101 102 // ------------------------------------------------------------------ 103 // ciObjectFactory::ciObjectFactory 104 void ciObjectFactory::initialize() { 105 ASSERT_IN_VM; 106 JavaThread* thread = JavaThread::current(); 107 HandleMark handle_mark(thread); 108 109 // This Arena is long lived and exists in the resource mark of the 110 // compiler thread that initializes the initial ciObjectFactory which 111 // creates the shared ciObjects that all later ciObjectFactories use. 112 Arena* arena = new (mtCompiler) Arena(mtCompiler); 113 ciEnv initial(arena); 114 ciEnv* env = ciEnv::current(); 115 env->_factory->init_shared_objects(); 116 117 _initialized = true; 118 119 } 120 121 void ciObjectFactory::init_shared_objects() { 122 123 _next_ident = 1; // start numbering CI objects at 1 124 125 { 126 // Create the shared symbols, but not in _shared_ci_metadata. 127 for (auto index : EnumRange<vmSymbolID>{}) { 128 Symbol* vmsym = vmSymbols::symbol_at(index); 129 assert(vmSymbols::find_sid(vmsym) == index, "1-1 mapping"); 130 ciSymbol* sym = new (_arena) ciSymbol(vmsym, index); 131 init_ident_of(sym); 132 _shared_ci_symbols[vmSymbols::as_int(index)] = sym; 133 } 134 #ifdef ASSERT 135 for (auto index : EnumRange<vmSymbolID>{}) { 136 Symbol* vmsym = vmSymbols::symbol_at(index); 137 ciSymbol* sym = vm_symbol_at(index); 138 assert(sym->get_symbol() == vmsym, "oop must match"); 139 } 140 assert(ciSymbols::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check"); 141 #endif 142 } 143 144 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) { 145 BasicType t = (BasicType)i; 146 if (type2name(t) != NULL && !is_reference_type(t) && 147 t != T_NARROWOOP && t != T_NARROWKLASS) { 148 ciType::_basic_types[t] = new (_arena) ciType(t); 149 init_ident_of(ciType::_basic_types[t]); 150 } 151 } 152 153 ciEnv::_null_object_instance = new (_arena) ciNullObject(); 154 init_ident_of(ciEnv::_null_object_instance); 155 156 #define VM_CLASS_DEFN(name, ignore_s) \ 157 if (vmClasses::name##_is_loaded()) \ 158 ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass(); 159 160 VM_CLASSES_DO(VM_CLASS_DEFN) 161 #undef VM_CLASS_DEFN 162 163 for (int len = -1; len != _ci_metadata.length(); ) { 164 len = _ci_metadata.length(); 165 for (int i2 = 0; i2 < len; i2++) { 166 ciMetadata* obj = _ci_metadata.at(i2); 167 assert (obj->is_metadata(), "what else would it be?"); 168 if (obj->is_loaded() && obj->is_instance_klass()) { 169 obj->as_instance_klass()->compute_nonstatic_fields(); 170 } 171 } 172 } 173 174 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol()); 175 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents 176 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL); 177 init_ident_of(ciEnv::_unloaded_ciinstance_klass); 178 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1); 179 init_ident_of(ciEnv::_unloaded_ciobjarrayklass); 180 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking"); 181 182 get_metadata(Universe::boolArrayKlassObj()); 183 get_metadata(Universe::charArrayKlassObj()); 184 get_metadata(Universe::floatArrayKlassObj()); 185 get_metadata(Universe::doubleArrayKlassObj()); 186 get_metadata(Universe::byteArrayKlassObj()); 187 get_metadata(Universe::shortArrayKlassObj()); 188 get_metadata(Universe::intArrayKlassObj()); 189 get_metadata(Universe::longArrayKlassObj()); 190 191 assert(_non_perm_count == 0, "no shared non-perm objects"); 192 193 // The shared_ident_limit is the first ident number that will 194 // be used for non-shared objects. That is, numbers less than 195 // this limit are permanently assigned to shared CI objects, 196 // while the higher numbers are recycled afresh by each new ciEnv. 197 198 _shared_ident_limit = _next_ident; 199 _shared_ci_metadata = &_ci_metadata; 200 } 201 202 203 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) { 204 vmSymbolID sid = vmSymbols::find_sid(key); 205 if (sid != vmSymbolID::NO_SID) { 206 // do not pollute the main cache with it 207 return vm_symbol_at(sid); 208 } 209 210 assert(vmSymbols::find_sid(key) == vmSymbolID::NO_SID, ""); 211 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbolID::NO_SID); 212 _symbols.push(s); 213 return s; 214 } 215 216 // Decrement the refcount when done on symbols referenced by this compilation. 217 void ciObjectFactory::remove_symbols() { 218 for (int i = 0; i < _symbols.length(); i++) { 219 ciSymbol* s = _symbols.at(i); 220 s->get_symbol()->decrement_refcount(); 221 } 222 // Since _symbols is resource allocated we're not allowed to delete it 223 // but it'll go away just the same. 224 } 225 226 // ------------------------------------------------------------------ 227 // ciObjectFactory::get 228 // 229 // Get the ciObject corresponding to some oop. If the ciObject has 230 // already been created, it is returned. Otherwise, a new ciObject 231 // is created. 232 ciObject* ciObjectFactory::get(oop key) { 233 ASSERT_IN_VM; 234 235 assert(Universe::heap()->is_in(key), "must be"); 236 237 NonPermObject* &bucket = find_non_perm(key); 238 if (bucket != NULL) { 239 return bucket->object(); 240 } 241 242 // The ciObject does not yet exist. Create it and insert it 243 // into the cache. 244 Handle keyHandle(Thread::current(), key); 245 ciObject* new_object = create_new_object(keyHandle()); 246 assert(keyHandle() == new_object->get_oop(), "must be properly recorded"); 247 init_ident_of(new_object); 248 assert(Universe::heap()->is_in(new_object->get_oop()), "must be"); 249 250 // Not a perm-space object. 251 insert_non_perm(bucket, keyHandle(), new_object); 252 return new_object; 253 } 254 255 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) { 256 Metadata* value = elt->constant_encoding(); 257 if (key < value) return -1; 258 else if (key > value) return 1; 259 else return 0; 260 } 261 262 // ------------------------------------------------------------------ 263 // ciObjectFactory::cached_metadata 264 // 265 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has 266 // already been created, it is returned. Otherwise, null is returned. 267 ciMetadata* ciObjectFactory::cached_metadata(Metadata* key) { 268 ASSERT_IN_VM; 269 270 bool found = false; 271 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found); 272 273 if (!found) { 274 return NULL; 275 } 276 return _ci_metadata.at(index)->as_metadata(); 277 } 278 279 280 // ------------------------------------------------------------------ 281 // ciObjectFactory::get_metadata 282 // 283 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has 284 // already been created, it is returned. Otherwise, a new ciMetadata 285 // is created. 286 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) { 287 ASSERT_IN_VM; 288 289 #ifdef ASSERT 290 if (CIObjectFactoryVerify) { 291 Metadata* last = NULL; 292 for (int j = 0; j < _ci_metadata.length(); j++) { 293 Metadata* o = _ci_metadata.at(j)->constant_encoding(); 294 assert(last < o, "out of order"); 295 last = o; 296 } 297 } 298 #endif // ASSERT 299 int len = _ci_metadata.length(); 300 bool found = false; 301 int index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found); 302 #ifdef ASSERT 303 if (CIObjectFactoryVerify) { 304 for (int i = 0; i < _ci_metadata.length(); i++) { 305 if (_ci_metadata.at(i)->constant_encoding() == key) { 306 assert(index == i, " bad lookup"); 307 } 308 } 309 } 310 #endif 311 312 if (!found) { 313 // The ciMetadata does not yet exist. Create it and insert it 314 // into the cache. 315 ciMetadata* new_object = create_new_metadata(key); 316 init_ident_of(new_object); 317 assert(new_object->is_metadata(), "must be"); 318 319 if (len != _ci_metadata.length()) { 320 // creating the new object has recursively entered new objects 321 // into the table. We need to recompute our index. 322 index = _ci_metadata.find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found); 323 } 324 assert(!found, "no double insert"); 325 _ci_metadata.insert_before(index, new_object); 326 return new_object; 327 } 328 return _ci_metadata.at(index)->as_metadata(); 329 } 330 331 // ------------------------------------------------------------------ 332 // ciObjectFactory::create_new_object 333 // 334 // Create a new ciObject from an oop. 335 // 336 // Implementation note: this functionality could be virtual behavior 337 // of the oop itself. For now, we explicitly marshal the object. 338 ciObject* ciObjectFactory::create_new_object(oop o) { 339 EXCEPTION_CONTEXT; 340 341 if (o->is_instance()) { 342 instanceHandle h_i(THREAD, (instanceOop)o); 343 if (java_lang_invoke_CallSite::is_instance(o)) 344 return new (arena()) ciCallSite(h_i); 345 else if (java_lang_invoke_MemberName::is_instance(o)) 346 return new (arena()) ciMemberName(h_i); 347 else if (jdk_internal_invoke_NativeEntryPoint::is_instance(o)) 348 return new (arena()) ciNativeEntryPoint(h_i); 349 else if (java_lang_invoke_MethodHandle::is_instance(o)) 350 return new (arena()) ciMethodHandle(h_i); 351 else if (java_lang_invoke_MethodType::is_instance(o)) 352 return new (arena()) ciMethodType(h_i); 353 else 354 return new (arena()) ciInstance(h_i); 355 } else if (o->is_objArray()) { 356 objArrayHandle h_oa(THREAD, (objArrayOop)o); 357 return new (arena()) ciObjArray(h_oa); 358 } else if (o->is_typeArray()) { 359 typeArrayHandle h_ta(THREAD, (typeArrayOop)o); 360 return new (arena()) ciTypeArray(h_ta); 361 } 362 363 // The oop is of some type not supported by the compiler interface. 364 ShouldNotReachHere(); 365 return NULL; 366 } 367 368 // ------------------------------------------------------------------ 369 // ciObjectFactory::create_new_metadata 370 // 371 // Create a new ciMetadata from a Metadata*. 372 // 373 // Implementation note: in order to keep Metadata live, an auxiliary ciObject 374 // is used, which points to it's holder. 375 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) { 376 EXCEPTION_CONTEXT; 377 378 if (o->is_klass()) { 379 Klass* k = (Klass*)o; 380 if (k->is_instance_klass()) { 381 assert(!ReplayCompiles || ciReplay::no_replay_state() || !ciReplay::is_klass_unresolved((InstanceKlass*)k), "must be whitelisted for replay compilation"); 382 return new (arena()) ciInstanceKlass(k); 383 } else if (k->is_objArray_klass()) { 384 return new (arena()) ciObjArrayKlass(k); 385 } else if (k->is_typeArray_klass()) { 386 return new (arena()) ciTypeArrayKlass(k); 387 } 388 } else if (o->is_method()) { 389 methodHandle h_m(THREAD, (Method*)o); 390 ciEnv *env = CURRENT_THREAD_ENV; 391 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder()); 392 return new (arena()) ciMethod(h_m, holder); 393 } else if (o->is_methodData()) { 394 // Hold methodHandle alive - might not be necessary ??? 395 methodHandle h_m(THREAD, ((MethodData*)o)->method()); 396 return new (arena()) ciMethodData((MethodData*)o); 397 } 398 399 // The Metadata* is of some type not supported by the compiler interface. 400 ShouldNotReachHere(); 401 return NULL; 402 } 403 404 //------------------------------------------------------------------ 405 // ciObjectFactory::get_unloaded_method 406 // 407 // Get the ciMethod representing an unloaded/unfound method. 408 // 409 // Implementation note: unloaded methods are currently stored in 410 // an unordered array, requiring a linear-time lookup for each 411 // unloaded method. This may need to change. 412 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder, 413 ciSymbol* name, 414 ciSymbol* signature, 415 ciInstanceKlass* accessor) { 416 assert(accessor != NULL, "need origin of access"); 417 ciSignature* that = NULL; 418 for (int i = 0; i < _unloaded_methods.length(); i++) { 419 ciMethod* entry = _unloaded_methods.at(i); 420 if (entry->holder()->equals(holder) && 421 entry->name()->equals(name) && 422 entry->signature()->as_symbol()->equals(signature)) { 423 // Short-circuit slow resolve. 424 if (entry->signature()->accessing_klass() == accessor) { 425 // We've found a match. 426 return entry; 427 } else { 428 // Lazily create ciSignature 429 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature); 430 if (entry->signature()->equals(that)) { 431 // We've found a match. 432 return entry; 433 } 434 } 435 } 436 } 437 438 // This is a new unloaded method. Create it and stick it in 439 // the cache. 440 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor); 441 442 init_ident_of(new_method); 443 _unloaded_methods.append(new_method); 444 445 return new_method; 446 } 447 448 //------------------------------------------------------------------ 449 // ciObjectFactory::get_unloaded_klass 450 // 451 // Get a ciKlass representing an unloaded klass. 452 // 453 // Implementation note: unloaded klasses are currently stored in 454 // an unordered array, requiring a linear-time lookup for each 455 // unloaded klass. This may need to change. 456 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass, 457 ciSymbol* name, 458 bool create_if_not_found) { 459 EXCEPTION_CONTEXT; 460 oop loader = NULL; 461 oop domain = NULL; 462 if (accessing_klass != NULL) { 463 loader = accessing_klass->loader(); 464 domain = accessing_klass->protection_domain(); 465 } 466 for (int i = 0; i < _unloaded_klasses.length(); i++) { 467 ciKlass* entry = _unloaded_klasses.at(i); 468 if (entry->name()->equals(name) && 469 entry->loader() == loader && 470 entry->protection_domain() == domain) { 471 // We've found a match. 472 return entry; 473 } 474 } 475 476 if (!create_if_not_found) 477 return NULL; 478 479 // This is a new unloaded klass. Create it and stick it in 480 // the cache. 481 ciKlass* new_klass = NULL; 482 483 // Two cases: this is an unloaded ObjArrayKlass or an 484 // unloaded InstanceKlass. Deal with both. 485 if (name->char_at(0) == JVM_SIGNATURE_ARRAY) { 486 // Decompose the name.' 487 SignatureStream ss(name->get_symbol(), false); 488 int dimension = ss.skip_array_prefix(); // skip all '['s 489 BasicType element_type = ss.type(); 490 assert(element_type != T_ARRAY, "unsuccessful decomposition"); 491 ciKlass* element_klass = NULL; 492 if (element_type == T_OBJECT) { 493 ciEnv *env = CURRENT_THREAD_ENV; 494 ciSymbol* ci_name = env->get_symbol(ss.as_symbol()); 495 element_klass = 496 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass(); 497 } else { 498 assert(dimension > 1, "one dimensional type arrays are always loaded."); 499 500 // The type array itself takes care of one of the dimensions. 501 dimension--; 502 503 // The element klass is a TypeArrayKlass. 504 element_klass = ciTypeArrayKlass::make(element_type); 505 } 506 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension); 507 } else { 508 jobject loader_handle = NULL; 509 jobject domain_handle = NULL; 510 if (accessing_klass != NULL) { 511 loader_handle = accessing_klass->loader_handle(); 512 domain_handle = accessing_klass->protection_domain_handle(); 513 } 514 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle); 515 } 516 init_ident_of(new_klass); 517 _unloaded_klasses.append(new_klass); 518 519 return new_klass; 520 } 521 522 523 //------------------------------------------------------------------ 524 // ciObjectFactory::get_unloaded_instance 525 // 526 // Get a ciInstance representing an as-yet undetermined instance of a given class. 527 // 528 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) { 529 for (int i = 0; i < _unloaded_instances.length(); i++) { 530 ciInstance* entry = _unloaded_instances.at(i); 531 if (entry->klass()->equals(instance_klass)) { 532 // We've found a match. 533 return entry; 534 } 535 } 536 537 // This is a new unloaded instance. Create it and stick it in 538 // the cache. 539 ciInstance* new_instance = new (arena()) ciInstance(instance_klass); 540 541 init_ident_of(new_instance); 542 _unloaded_instances.append(new_instance); 543 544 // make sure it looks the way we want: 545 assert(!new_instance->is_loaded(), ""); 546 assert(new_instance->klass() == instance_klass, ""); 547 548 return new_instance; 549 } 550 551 552 //------------------------------------------------------------------ 553 // ciObjectFactory::get_unloaded_klass_mirror 554 // 555 // Get a ciInstance representing an unresolved klass mirror. 556 // 557 // Currently, this ignores the parameters and returns a unique unloaded instance. 558 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) { 559 assert(ciEnv::_Class_klass != NULL, ""); 560 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass()); 561 } 562 563 //------------------------------------------------------------------ 564 // ciObjectFactory::get_unloaded_method_handle_constant 565 // 566 // Get a ciInstance representing an unresolved method handle constant. 567 // 568 // Currently, this ignores the parameters and returns a unique unloaded instance. 569 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder, 570 ciSymbol* name, 571 ciSymbol* signature, 572 int ref_kind) { 573 assert(ciEnv::_MethodHandle_klass != NULL, ""); 574 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass()); 575 } 576 577 //------------------------------------------------------------------ 578 // ciObjectFactory::get_unloaded_method_type_constant 579 // 580 // Get a ciInstance representing an unresolved method type constant. 581 // 582 // Currently, this ignores the parameters and returns a unique unloaded instance. 583 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) { 584 assert(ciEnv::_MethodType_klass != NULL, ""); 585 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass()); 586 } 587 588 ciInstance* ciObjectFactory::get_unloaded_object_constant() { 589 assert(ciEnv::_Object_klass != NULL, ""); 590 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass()); 591 } 592 593 //------------------------------------------------------------------ 594 // ciObjectFactory::get_empty_methodData 595 // 596 // Get the ciMethodData representing the methodData for a method with 597 // none. 598 ciMethodData* ciObjectFactory::get_empty_methodData() { 599 ciMethodData* new_methodData = new (arena()) ciMethodData(); 600 init_ident_of(new_methodData); 601 return new_methodData; 602 } 603 604 //------------------------------------------------------------------ 605 // ciObjectFactory::get_return_address 606 // 607 // Get a ciReturnAddress for a specified bci. 608 ciReturnAddress* ciObjectFactory::get_return_address(int bci) { 609 for (int i = 0; i < _return_addresses.length(); i++) { 610 ciReturnAddress* entry = _return_addresses.at(i); 611 if (entry->bci() == bci) { 612 // We've found a match. 613 return entry; 614 } 615 } 616 617 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci); 618 init_ident_of(new_ret_addr); 619 _return_addresses.append(new_ret_addr); 620 return new_ret_addr; 621 } 622 623 // ------------------------------------------------------------------ 624 // ciObjectFactory::init_ident_of 625 void ciObjectFactory::init_ident_of(ciBaseObject* obj) { 626 obj->set_ident(_next_ident++); 627 } 628 629 static ciObjectFactory::NonPermObject* emptyBucket = NULL; 630 631 // ------------------------------------------------------------------ 632 // ciObjectFactory::find_non_perm 633 // 634 // Use a small hash table, hashed on the klass of the key. 635 // If there is no entry in the cache corresponding to this oop, return 636 // the null tail of the bucket into which the oop should be inserted. 637 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) { 638 assert(Universe::heap()->is_in(key), "must be"); 639 ciMetadata* klass = get_metadata(key->klass()); 640 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS]; 641 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) { 642 if (is_equal(p, key)) break; 643 } 644 return (*bp); 645 } 646 647 648 649 // ------------------------------------------------------------------ 650 // Code for for NonPermObject 651 // 652 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) { 653 assert(ciObjectFactory::is_initialized(), ""); 654 _object = object; 655 _next = bucket; 656 bucket = this; 657 } 658 659 660 661 // ------------------------------------------------------------------ 662 // ciObjectFactory::insert_non_perm 663 // 664 // Insert a ciObject into the non-perm table. 665 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) { 666 assert(Universe::heap()->is_in_or_null(key), "must be"); 667 assert(&where != &emptyBucket, "must not try to fill empty bucket"); 668 NonPermObject* p = new (arena()) NonPermObject(where, key, obj); 669 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match"); 670 assert(find_non_perm(key) == p, "must find the same spot"); 671 ++_non_perm_count; 672 } 673 674 // ------------------------------------------------------------------ 675 // ciObjectFactory::vm_symbol_at 676 // Get the ciSymbol corresponding to some index in vmSymbols. 677 ciSymbol* ciObjectFactory::vm_symbol_at(vmSymbolID sid) { 678 int index = vmSymbols::as_int(sid); 679 return _shared_ci_symbols[index]; 680 } 681 682 // ------------------------------------------------------------------ 683 // ciObjectFactory::metadata_do 684 void ciObjectFactory::metadata_do(MetadataClosure* f) { 685 for (int j = 0; j < _ci_metadata.length(); j++) { 686 Metadata* o = _ci_metadata.at(j)->constant_encoding(); 687 f->do_metadata(o); 688 } 689 } 690 691 // ------------------------------------------------------------------ 692 // ciObjectFactory::print_contents_impl 693 void ciObjectFactory::print_contents_impl() { 694 int len = _ci_metadata.length(); 695 tty->print_cr("ciObjectFactory (%d) meta data contents:", len); 696 for (int i = 0; i < len; i++) { 697 _ci_metadata.at(i)->print(); 698 tty->cr(); 699 } 700 } 701 702 // ------------------------------------------------------------------ 703 // ciObjectFactory::print_contents 704 void ciObjectFactory::print_contents() { 705 print(); 706 tty->cr(); 707 GUARDED_VM_ENTRY(print_contents_impl();) 708 } 709 710 // ------------------------------------------------------------------ 711 // ciObjectFactory::print 712 // 713 // Print debugging information about the object factory 714 void ciObjectFactory::print() { 715 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>", 716 _non_perm_count, _ci_metadata.length(), _unloaded_methods.length(), 717 _unloaded_instances.length(), 718 _unloaded_klasses.length()); 719 }