1 /* 2 * Copyright (c) 1999, 2015, 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/ciMethod.hpp" 31 #include "ci/ciMethodData.hpp" 32 #include "ci/ciMethodHandle.hpp" 33 #include "ci/ciMethodType.hpp" 34 #include "ci/ciNullObject.hpp" 35 #include "ci/ciObjArray.hpp" 36 #include "ci/ciObjArrayKlass.hpp" 37 #include "ci/ciObject.hpp" 38 #include "ci/ciObjectFactory.hpp" 39 #include "ci/ciSymbol.hpp" 40 #include "ci/ciTypeArray.hpp" 41 #include "ci/ciTypeArrayKlass.hpp" 42 #include "ci/ciUtilities.hpp" 43 #include "classfile/javaClasses.inline.hpp" 44 #include "classfile/systemDictionary.hpp" 45 #include "gc/shared/collectedHeap.inline.hpp" 46 #include "memory/allocation.inline.hpp" 47 #include "oops/oop.inline.hpp" 48 #include "runtime/fieldType.hpp" 49 #include "utilities/macros.hpp" 50 #if INCLUDE_ALL_GCS 51 # include "gc/shared/satbMarkQueue.hpp" 52 #endif 53 54 // ciObjectFactory 55 // 56 // This class handles requests for the creation of new instances 57 // of ciObject and its subclasses. It contains a caching mechanism 58 // which ensures that for each oop, at most one ciObject is created. 59 // This invariant allows more efficient implementation of ciObject. 60 // 61 // Implementation note: the oop->ciObject mapping is represented as 62 // a table stored in an array. Even though objects are moved 63 // by the garbage collector, the compactor preserves their relative 64 // order; address comparison of oops (in perm space) is safe so long 65 // as we prohibit GC during our comparisons. We currently use binary 66 // search to find the oop in the table, and inserting a new oop 67 // into the table may be costly. If this cost ends up being 68 // problematic the underlying data structure can be switched to some 69 // sort of balanced binary tree. 70 71 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL; 72 ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT]; 73 int ciObjectFactory::_shared_ident_limit = 0; 74 volatile bool ciObjectFactory::_initialized = false; 75 76 77 // ------------------------------------------------------------------ 78 // ciObjectFactory::ciObjectFactory 79 ciObjectFactory::ciObjectFactory(Arena* arena, 80 int expected_size) { 81 82 for (int i = 0; i < NON_PERM_BUCKETS; i++) { 83 _non_perm_bucket[i] = NULL; 84 } 85 _non_perm_count = 0; 86 87 _next_ident = _shared_ident_limit; 88 _arena = arena; 89 _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL); 90 91 // If the shared ci objects exist append them to this factory's objects 92 93 if (_shared_ci_metadata != NULL) { 94 _ci_metadata->appendAll(_shared_ci_metadata); 95 } 96 97 _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL); 98 _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL); 99 _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL); 100 _return_addresses = 101 new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL); 102 103 _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL); 104 } 105 106 // ------------------------------------------------------------------ 107 // ciObjectFactory::ciObjectFactory 108 void ciObjectFactory::initialize() { 109 ASSERT_IN_VM; 110 JavaThread* thread = JavaThread::current(); 111 HandleMark handle_mark(thread); 112 113 // This Arena is long lived and exists in the resource mark of the 114 // compiler thread that initializes the initial ciObjectFactory which 115 // creates the shared ciObjects that all later ciObjectFactories use. 116 Arena* arena = new (mtCompiler) Arena(mtCompiler); 117 ciEnv initial(arena); 118 ciEnv* env = ciEnv::current(); 119 env->_factory->init_shared_objects(); 120 121 _initialized = true; 122 123 } 124 125 void ciObjectFactory::init_shared_objects() { 126 127 _next_ident = 1; // start numbering CI objects at 1 128 129 { 130 // Create the shared symbols, but not in _shared_ci_metadata. 131 int i; 132 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) { 133 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i); 134 assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping"); 135 ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i); 136 init_ident_of(sym); 137 _shared_ci_symbols[i] = sym; 138 } 139 #ifdef ASSERT 140 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) { 141 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i); 142 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i); 143 assert(sym->get_symbol() == vmsym, "oop must match"); 144 } 145 assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check"); 146 #endif 147 } 148 149 _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL); 150 151 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) { 152 BasicType t = (BasicType)i; 153 if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY && t != T_NARROWOOP && t != T_NARROWKLASS) { 154 ciType::_basic_types[t] = new (_arena) ciType(t); 155 init_ident_of(ciType::_basic_types[t]); 156 } 157 } 158 159 ciEnv::_null_object_instance = new (_arena) ciNullObject(); 160 init_ident_of(ciEnv::_null_object_instance); 161 162 #define WK_KLASS_DEFN(name, ignore_s, opt) \ 163 if (SystemDictionary::name() != NULL) \ 164 ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass(); 165 166 WK_KLASSES_DO(WK_KLASS_DEFN) 167 #undef WK_KLASS_DEFN 168 169 for (int len = -1; len != _ci_metadata->length(); ) { 170 len = _ci_metadata->length(); 171 for (int i2 = 0; i2 < len; i2++) { 172 ciMetadata* obj = _ci_metadata->at(i2); 173 assert (obj->is_metadata(), "what else would it be?"); 174 if (obj->is_loaded() && obj->is_instance_klass()) { 175 obj->as_instance_klass()->compute_nonstatic_fields(); 176 } 177 } 178 } 179 180 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol()); 181 // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents 182 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL); 183 init_ident_of(ciEnv::_unloaded_ciinstance_klass); 184 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1); 185 init_ident_of(ciEnv::_unloaded_ciobjarrayklass); 186 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking"); 187 188 get_metadata(Universe::boolArrayKlassObj()); 189 get_metadata(Universe::charArrayKlassObj()); 190 get_metadata(Universe::singleArrayKlassObj()); 191 get_metadata(Universe::doubleArrayKlassObj()); 192 get_metadata(Universe::byteArrayKlassObj()); 193 get_metadata(Universe::shortArrayKlassObj()); 194 get_metadata(Universe::intArrayKlassObj()); 195 get_metadata(Universe::longArrayKlassObj()); 196 197 198 199 assert(_non_perm_count == 0, "no shared non-perm objects"); 200 201 // The shared_ident_limit is the first ident number that will 202 // be used for non-shared objects. That is, numbers less than 203 // this limit are permanently assigned to shared CI objects, 204 // while the higher numbers are recycled afresh by each new ciEnv. 205 206 _shared_ident_limit = _next_ident; 207 _shared_ci_metadata = _ci_metadata; 208 } 209 210 211 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) { 212 vmSymbols::SID sid = vmSymbols::find_sid(key); 213 if (sid != vmSymbols::NO_SID) { 214 // do not pollute the main cache with it 215 return vm_symbol_at(sid); 216 } 217 218 assert(vmSymbols::find_sid(key) == vmSymbols::NO_SID, ""); 219 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbols::NO_SID); 220 _symbols->push(s); 221 return s; 222 } 223 224 // Decrement the refcount when done on symbols referenced by this compilation. 225 void ciObjectFactory::remove_symbols() { 226 for (int i = 0; i < _symbols->length(); i++) { 227 ciSymbol* s = _symbols->at(i); 228 s->get_symbol()->decrement_refcount(); 229 } 230 // Since _symbols is resource allocated we're not allowed to delete it 231 // but it'll go away just the same. 232 } 233 234 // ------------------------------------------------------------------ 235 // ciObjectFactory::get 236 // 237 // Get the ciObject corresponding to some oop. If the ciObject has 238 // already been created, it is returned. Otherwise, a new ciObject 239 // is created. 240 ciObject* ciObjectFactory::get(oop key) { 241 ASSERT_IN_VM; 242 243 assert(Universe::heap()->is_in_reserved(key), "must be"); 244 245 NonPermObject* &bucket = find_non_perm(key); 246 if (bucket != NULL) { 247 return bucket->object(); 248 } 249 250 // The ciObject does not yet exist. Create it and insert it 251 // into the cache. 252 Handle keyHandle(key); 253 ciObject* new_object = create_new_object(keyHandle()); 254 assert(keyHandle() == new_object->get_oop(), "must be properly recorded"); 255 init_ident_of(new_object); 256 assert(Universe::heap()->is_in_reserved(new_object->get_oop()), "must be"); 257 258 // Not a perm-space object. 259 insert_non_perm(bucket, keyHandle(), new_object); 260 return new_object; 261 } 262 263 int ciObjectFactory::metadata_compare(Metadata* const& key, ciMetadata* const& elt) { 264 Metadata* value = elt->constant_encoding(); 265 if (key < value) return -1; 266 else if (key > value) return 1; 267 else return 0; 268 } 269 270 // ------------------------------------------------------------------ 271 // ciObjectFactory::get_metadata 272 // 273 // Get the ciMetadata corresponding to some Metadata. If the ciMetadata has 274 // already been created, it is returned. Otherwise, a new ciMetadata 275 // is created. 276 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) { 277 ASSERT_IN_VM; 278 279 #ifdef ASSERT 280 if (CIObjectFactoryVerify) { 281 Metadata* last = NULL; 282 for (int j = 0; j< _ci_metadata->length(); j++) { 283 Metadata* o = _ci_metadata->at(j)->constant_encoding(); 284 assert(last < o, "out of order"); 285 last = o; 286 } 287 } 288 #endif // ASSERT 289 int len = _ci_metadata->length(); 290 bool found = false; 291 int index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found); 292 #ifdef ASSERT 293 if (CIObjectFactoryVerify) { 294 for (int i=0; i<_ci_metadata->length(); i++) { 295 if (_ci_metadata->at(i)->constant_encoding() == key) { 296 assert(index == i, " bad lookup"); 297 } 298 } 299 } 300 #endif 301 302 if (!found) { 303 // The ciMetadata does not yet exist. Create it and insert it 304 // into the cache. 305 ciMetadata* new_object = create_new_metadata(key); 306 init_ident_of(new_object); 307 assert(new_object->is_metadata(), "must be"); 308 309 if (len != _ci_metadata->length()) { 310 // creating the new object has recursively entered new objects 311 // into the table. We need to recompute our index. 312 index = _ci_metadata->find_sorted<Metadata*, ciObjectFactory::metadata_compare>(key, found); 313 } 314 assert(!found, "no double insert"); 315 _ci_metadata->insert_before(index, new_object); 316 return new_object; 317 } 318 return _ci_metadata->at(index)->as_metadata(); 319 } 320 321 // ------------------------------------------------------------------ 322 // ciObjectFactory::create_new_object 323 // 324 // Create a new ciObject from an oop. 325 // 326 // Implementation note: this functionality could be virtual behavior 327 // of the oop itself. For now, we explicitly marshal the object. 328 ciObject* ciObjectFactory::create_new_object(oop o) { 329 EXCEPTION_CONTEXT; 330 331 if (o->is_instance()) { 332 instanceHandle h_i(THREAD, (instanceOop)o); 333 if (java_lang_invoke_CallSite::is_instance(o)) 334 return new (arena()) ciCallSite(h_i); 335 else if (java_lang_invoke_MemberName::is_instance(o)) 336 return new (arena()) ciMemberName(h_i); 337 else if (java_lang_invoke_MethodHandle::is_instance(o)) 338 return new (arena()) ciMethodHandle(h_i); 339 else if (java_lang_invoke_MethodType::is_instance(o)) 340 return new (arena()) ciMethodType(h_i); 341 else 342 return new (arena()) ciInstance(h_i); 343 } else if (o->is_objArray()) { 344 objArrayHandle h_oa(THREAD, (objArrayOop)o); 345 return new (arena()) ciObjArray(h_oa); 346 } else if (o->is_typeArray()) { 347 typeArrayHandle h_ta(THREAD, (typeArrayOop)o); 348 return new (arena()) ciTypeArray(h_ta); 349 } 350 351 // The oop is of some type not supported by the compiler interface. 352 ShouldNotReachHere(); 353 return NULL; 354 } 355 356 // ------------------------------------------------------------------ 357 // ciObjectFactory::create_new_metadata 358 // 359 // Create a new ciMetadata from a Metadata*. 360 // 361 // Implementation note: in order to keep Metadata live, an auxiliary ciObject 362 // is used, which points to it's holder. 363 ciMetadata* ciObjectFactory::create_new_metadata(Metadata* o) { 364 EXCEPTION_CONTEXT; 365 366 // Hold metadata from unloading by keeping it's holder alive. 367 if (_initialized && o->is_klass()) { 368 Klass* holder = ((Klass*)o); 369 if (holder->is_instance_klass() && InstanceKlass::cast(holder)->is_anonymous()) { 370 // Though ciInstanceKlass records class loader oop, it's not enough to keep 371 // VM anonymous classes alive (loader == NULL). Klass holder should be used instead. 372 // It is enough to record a ciObject, since cached elements are never removed 373 // during ciObjectFactory lifetime. ciObjectFactory itself is created for 374 // every compilation and lives for the whole duration of the compilation. 375 ciObject* h = get(holder->klass_holder()); 376 } 377 } 378 379 if (o->is_klass()) { 380 KlassHandle h_k(THREAD, (Klass*)o); 381 Klass* k = (Klass*)o; 382 if (k->is_instance_klass()) { 383 return new (arena()) ciInstanceKlass(h_k); 384 } else if (k->is_objArray_klass()) { 385 return new (arena()) ciObjArrayKlass(h_k); 386 } else if (k->is_typeArray_klass()) { 387 return new (arena()) ciTypeArrayKlass(h_k); 388 } 389 } else if (o->is_method()) { 390 methodHandle h_m(THREAD, (Method*)o); 391 ciEnv *env = CURRENT_THREAD_ENV; 392 ciInstanceKlass* holder = env->get_instance_klass(h_m()->method_holder()); 393 return new (arena()) ciMethod(h_m, holder); 394 } else if (o->is_methodData()) { 395 // Hold methodHandle alive - might not be necessary ??? 396 methodHandle h_m(THREAD, ((MethodData*)o)->method()); 397 return new (arena()) ciMethodData((MethodData*)o); 398 } 399 400 // The Metadata* is of some type not supported by the compiler interface. 401 ShouldNotReachHere(); 402 return NULL; 403 } 404 405 // ------------------------------------------------------------------ 406 // ciObjectFactory::ensure_metadata_alive 407 // 408 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC. 409 // This is primarily useful for metadata which is considered as weak roots 410 // by the GC but need to be strong roots if reachable from a current compilation. 411 // 412 void ciObjectFactory::ensure_metadata_alive(ciMetadata* m) { 413 ASSERT_IN_VM; // We're handling raw oops here. 414 415 #if INCLUDE_ALL_GCS 416 if (!UseG1GC) { 417 return; 418 } 419 Klass* metadata_owner_klass; 420 if (m->is_klass()) { 421 metadata_owner_klass = m->as_klass()->get_Klass(); 422 } else if (m->is_method()) { 423 metadata_owner_klass = m->as_method()->get_Method()->constants()->pool_holder(); 424 } else { 425 fatal("Not implemented for other types of metadata"); 426 return; 427 } 428 429 oop metadata_holder = metadata_owner_klass->klass_holder(); 430 if (metadata_holder != NULL) { 431 SATBMarkQueue::enqueue(metadata_holder); 432 } 433 434 #endif 435 } 436 437 //------------------------------------------------------------------ 438 // ciObjectFactory::get_unloaded_method 439 // 440 // Get the ciMethod representing an unloaded/unfound method. 441 // 442 // Implementation note: unloaded methods are currently stored in 443 // an unordered array, requiring a linear-time lookup for each 444 // unloaded method. This may need to change. 445 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder, 446 ciSymbol* name, 447 ciSymbol* signature, 448 ciInstanceKlass* accessor) { 449 ciSignature* that = NULL; 450 for (int i = 0; i < _unloaded_methods->length(); i++) { 451 ciMethod* entry = _unloaded_methods->at(i); 452 if (entry->holder()->equals(holder) && 453 entry->name()->equals(name) && 454 entry->signature()->as_symbol()->equals(signature)) { 455 // Short-circuit slow resolve. 456 if (entry->signature()->accessing_klass() == accessor) { 457 // We've found a match. 458 return entry; 459 } else { 460 // Lazily create ciSignature 461 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature); 462 if (entry->signature()->equals(that)) { 463 // We've found a match. 464 return entry; 465 } 466 } 467 } 468 } 469 470 // This is a new unloaded method. Create it and stick it in 471 // the cache. 472 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor); 473 474 init_ident_of(new_method); 475 _unloaded_methods->append(new_method); 476 477 return new_method; 478 } 479 480 //------------------------------------------------------------------ 481 // ciObjectFactory::get_unloaded_klass 482 // 483 // Get a ciKlass representing an unloaded klass. 484 // 485 // Implementation note: unloaded klasses are currently stored in 486 // an unordered array, requiring a linear-time lookup for each 487 // unloaded klass. This may need to change. 488 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass, 489 ciSymbol* name, 490 bool create_if_not_found) { 491 EXCEPTION_CONTEXT; 492 oop loader = NULL; 493 oop domain = NULL; 494 if (accessing_klass != NULL) { 495 loader = accessing_klass->loader(); 496 domain = accessing_klass->protection_domain(); 497 } 498 for (int i=0; i<_unloaded_klasses->length(); i++) { 499 ciKlass* entry = _unloaded_klasses->at(i); 500 if (entry->name()->equals(name) && 501 entry->loader() == loader && 502 entry->protection_domain() == domain) { 503 // We've found a match. 504 return entry; 505 } 506 } 507 508 if (!create_if_not_found) 509 return NULL; 510 511 // This is a new unloaded klass. Create it and stick it in 512 // the cache. 513 ciKlass* new_klass = NULL; 514 515 // Two cases: this is an unloaded ObjArrayKlass or an 516 // unloaded InstanceKlass. Deal with both. 517 if (name->byte_at(0) == '[') { 518 // Decompose the name.' 519 FieldArrayInfo fd; 520 BasicType element_type = FieldType::get_array_info(name->get_symbol(), 521 fd, THREAD); 522 if (HAS_PENDING_EXCEPTION) { 523 CLEAR_PENDING_EXCEPTION; 524 CURRENT_THREAD_ENV->record_out_of_memory_failure(); 525 return ciEnv::_unloaded_ciobjarrayklass; 526 } 527 int dimension = fd.dimension(); 528 assert(element_type != T_ARRAY, "unsuccessful decomposition"); 529 ciKlass* element_klass = NULL; 530 if (element_type == T_OBJECT) { 531 ciEnv *env = CURRENT_THREAD_ENV; 532 ciSymbol* ci_name = env->get_symbol(fd.object_key()); 533 element_klass = 534 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass(); 535 } else { 536 assert(dimension > 1, "one dimensional type arrays are always loaded."); 537 538 // The type array itself takes care of one of the dimensions. 539 dimension--; 540 541 // The element klass is a TypeArrayKlass. 542 element_klass = ciTypeArrayKlass::make(element_type); 543 } 544 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension); 545 } else { 546 jobject loader_handle = NULL; 547 jobject domain_handle = NULL; 548 if (accessing_klass != NULL) { 549 loader_handle = accessing_klass->loader_handle(); 550 domain_handle = accessing_klass->protection_domain_handle(); 551 } 552 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle); 553 } 554 init_ident_of(new_klass); 555 _unloaded_klasses->append(new_klass); 556 557 return new_klass; 558 } 559 560 561 //------------------------------------------------------------------ 562 // ciObjectFactory::get_unloaded_instance 563 // 564 // Get a ciInstance representing an as-yet undetermined instance of a given class. 565 // 566 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) { 567 for (int i=0; i<_unloaded_instances->length(); i++) { 568 ciInstance* entry = _unloaded_instances->at(i); 569 if (entry->klass()->equals(instance_klass)) { 570 // We've found a match. 571 return entry; 572 } 573 } 574 575 // This is a new unloaded instance. Create it and stick it in 576 // the cache. 577 ciInstance* new_instance = new (arena()) ciInstance(instance_klass); 578 579 init_ident_of(new_instance); 580 _unloaded_instances->append(new_instance); 581 582 // make sure it looks the way we want: 583 assert(!new_instance->is_loaded(), ""); 584 assert(new_instance->klass() == instance_klass, ""); 585 586 return new_instance; 587 } 588 589 590 //------------------------------------------------------------------ 591 // ciObjectFactory::get_unloaded_klass_mirror 592 // 593 // Get a ciInstance representing an unresolved klass mirror. 594 // 595 // Currently, this ignores the parameters and returns a unique unloaded instance. 596 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) { 597 assert(ciEnv::_Class_klass != NULL, ""); 598 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass()); 599 } 600 601 //------------------------------------------------------------------ 602 // ciObjectFactory::get_unloaded_method_handle_constant 603 // 604 // Get a ciInstance representing an unresolved method handle constant. 605 // 606 // Currently, this ignores the parameters and returns a unique unloaded instance. 607 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder, 608 ciSymbol* name, 609 ciSymbol* signature, 610 int ref_kind) { 611 if (ciEnv::_MethodHandle_klass == NULL) return NULL; 612 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass()); 613 } 614 615 //------------------------------------------------------------------ 616 // ciObjectFactory::get_unloaded_method_type_constant 617 // 618 // Get a ciInstance representing an unresolved method type constant. 619 // 620 // Currently, this ignores the parameters and returns a unique unloaded instance. 621 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) { 622 if (ciEnv::_MethodType_klass == NULL) return NULL; 623 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass()); 624 } 625 626 ciInstance* ciObjectFactory::get_unloaded_object_constant() { 627 if (ciEnv::_Object_klass == NULL) return NULL; 628 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass()); 629 } 630 631 //------------------------------------------------------------------ 632 // ciObjectFactory::get_empty_methodData 633 // 634 // Get the ciMethodData representing the methodData for a method with 635 // none. 636 ciMethodData* ciObjectFactory::get_empty_methodData() { 637 ciMethodData* new_methodData = new (arena()) ciMethodData(); 638 init_ident_of(new_methodData); 639 return new_methodData; 640 } 641 642 //------------------------------------------------------------------ 643 // ciObjectFactory::get_return_address 644 // 645 // Get a ciReturnAddress for a specified bci. 646 ciReturnAddress* ciObjectFactory::get_return_address(int bci) { 647 for (int i=0; i<_return_addresses->length(); i++) { 648 ciReturnAddress* entry = _return_addresses->at(i); 649 if (entry->bci() == bci) { 650 // We've found a match. 651 return entry; 652 } 653 } 654 655 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci); 656 init_ident_of(new_ret_addr); 657 _return_addresses->append(new_ret_addr); 658 return new_ret_addr; 659 } 660 661 // ------------------------------------------------------------------ 662 // ciObjectFactory::init_ident_of 663 void ciObjectFactory::init_ident_of(ciBaseObject* obj) { 664 obj->set_ident(_next_ident++); 665 } 666 667 static ciObjectFactory::NonPermObject* emptyBucket = NULL; 668 669 // ------------------------------------------------------------------ 670 // ciObjectFactory::find_non_perm 671 // 672 // Use a small hash table, hashed on the klass of the key. 673 // If there is no entry in the cache corresponding to this oop, return 674 // the null tail of the bucket into which the oop should be inserted. 675 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) { 676 assert(Universe::heap()->is_in_reserved(key), "must be"); 677 ciMetadata* klass = get_metadata(key->klass()); 678 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS]; 679 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) { 680 if (is_equal(p, key)) break; 681 } 682 return (*bp); 683 } 684 685 686 687 // ------------------------------------------------------------------ 688 // Code for for NonPermObject 689 // 690 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) { 691 assert(ciObjectFactory::is_initialized(), ""); 692 _object = object; 693 _next = bucket; 694 bucket = this; 695 } 696 697 698 699 // ------------------------------------------------------------------ 700 // ciObjectFactory::insert_non_perm 701 // 702 // Insert a ciObject into the non-perm table. 703 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) { 704 assert(Universe::heap()->is_in_reserved_or_null(key), "must be"); 705 assert(&where != &emptyBucket, "must not try to fill empty bucket"); 706 NonPermObject* p = new (arena()) NonPermObject(where, key, obj); 707 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match"); 708 assert(find_non_perm(key) == p, "must find the same spot"); 709 ++_non_perm_count; 710 } 711 712 // ------------------------------------------------------------------ 713 // ciObjectFactory::vm_symbol_at 714 // Get the ciSymbol corresponding to some index in vmSymbols. 715 ciSymbol* ciObjectFactory::vm_symbol_at(int index) { 716 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob"); 717 return _shared_ci_symbols[index]; 718 } 719 720 // ------------------------------------------------------------------ 721 // ciObjectFactory::metadata_do 722 void ciObjectFactory::metadata_do(void f(Metadata*)) { 723 if (_ci_metadata == NULL) return; 724 for (int j = 0; j< _ci_metadata->length(); j++) { 725 Metadata* o = _ci_metadata->at(j)->constant_encoding(); 726 f(o); 727 } 728 } 729 730 // ------------------------------------------------------------------ 731 // ciObjectFactory::print_contents_impl 732 void ciObjectFactory::print_contents_impl() { 733 int len = _ci_metadata->length(); 734 tty->print_cr("ciObjectFactory (%d) meta data contents:", len); 735 for (int i=0; i<len; i++) { 736 _ci_metadata->at(i)->print(); 737 tty->cr(); 738 } 739 } 740 741 // ------------------------------------------------------------------ 742 // ciObjectFactory::print_contents 743 void ciObjectFactory::print_contents() { 744 print(); 745 tty->cr(); 746 GUARDED_VM_ENTRY(print_contents_impl();) 747 } 748 749 // ------------------------------------------------------------------ 750 // ciObjectFactory::print 751 // 752 // Print debugging information about the object factory 753 void ciObjectFactory::print() { 754 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>", 755 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(), 756 _unloaded_instances->length(), 757 _unloaded_klasses->length()); 758 }