1 /* 2 * Copyright (c) 1999, 2017, 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/g1/g1SATBCardTableModRefBS.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(Thread::current(), 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 Klass* k = (Klass*)o; 381 if (k->is_instance_klass()) { 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::ensure_metadata_alive 406 // 407 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC. 408 // This is primarily useful for metadata which is considered as weak roots 409 // by the GC but need to be strong roots if reachable from a current compilation. 410 // 411 void ciObjectFactory::ensure_metadata_alive(ciMetadata* m) { 412 ASSERT_IN_VM; // We're handling raw oops here. 413 414 #if INCLUDE_ALL_GCS 415 if (!UseG1GC) { 416 return; 417 } 418 Klass* metadata_owner_klass; 419 if (m->is_klass()) { 420 metadata_owner_klass = m->as_klass()->get_Klass(); 421 } else if (m->is_method()) { 422 metadata_owner_klass = m->as_method()->get_Method()->constants()->pool_holder(); 423 } else { 424 fatal("Not implemented for other types of metadata"); 425 return; 426 } 427 428 oop metadata_holder = metadata_owner_klass->klass_holder(); 429 if (metadata_holder != NULL) { 430 G1SATBCardTableModRefBS::enqueue(metadata_holder); 431 } 432 433 #endif 434 } 435 436 //------------------------------------------------------------------ 437 // ciObjectFactory::get_unloaded_method 438 // 439 // Get the ciMethod representing an unloaded/unfound method. 440 // 441 // Implementation note: unloaded methods are currently stored in 442 // an unordered array, requiring a linear-time lookup for each 443 // unloaded method. This may need to change. 444 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder, 445 ciSymbol* name, 446 ciSymbol* signature, 447 ciInstanceKlass* accessor) { 448 ciSignature* that = NULL; 449 for (int i = 0; i < _unloaded_methods->length(); i++) { 450 ciMethod* entry = _unloaded_methods->at(i); 451 if (entry->holder()->equals(holder) && 452 entry->name()->equals(name) && 453 entry->signature()->as_symbol()->equals(signature)) { 454 // Short-circuit slow resolve. 455 if (entry->signature()->accessing_klass() == accessor) { 456 // We've found a match. 457 return entry; 458 } else { 459 // Lazily create ciSignature 460 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature); 461 if (entry->signature()->equals(that)) { 462 // We've found a match. 463 return entry; 464 } 465 } 466 } 467 } 468 469 // This is a new unloaded method. Create it and stick it in 470 // the cache. 471 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor); 472 473 init_ident_of(new_method); 474 _unloaded_methods->append(new_method); 475 476 return new_method; 477 } 478 479 //------------------------------------------------------------------ 480 // ciObjectFactory::get_unloaded_klass 481 // 482 // Get a ciKlass representing an unloaded klass. 483 // 484 // Implementation note: unloaded klasses are currently stored in 485 // an unordered array, requiring a linear-time lookup for each 486 // unloaded klass. This may need to change. 487 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass, 488 ciSymbol* name, 489 bool create_if_not_found) { 490 EXCEPTION_CONTEXT; 491 oop loader = NULL; 492 oop domain = NULL; 493 if (accessing_klass != NULL) { 494 loader = accessing_klass->loader(); 495 domain = accessing_klass->protection_domain(); 496 } 497 for (int i=0; i<_unloaded_klasses->length(); i++) { 498 ciKlass* entry = _unloaded_klasses->at(i); 499 if (entry->name()->equals(name) && 500 entry->loader() == loader && 501 entry->protection_domain() == domain) { 502 // We've found a match. 503 return entry; 504 } 505 } 506 507 if (!create_if_not_found) 508 return NULL; 509 510 // This is a new unloaded klass. Create it and stick it in 511 // the cache. 512 ciKlass* new_klass = NULL; 513 514 // Two cases: this is an unloaded ObjArrayKlass or an 515 // unloaded InstanceKlass. Deal with both. 516 if (name->byte_at(0) == '[') { 517 // Decompose the name.' 518 FieldArrayInfo fd; 519 BasicType element_type = FieldType::get_array_info(name->get_symbol(), 520 fd, THREAD); 521 if (HAS_PENDING_EXCEPTION) { 522 CLEAR_PENDING_EXCEPTION; 523 CURRENT_THREAD_ENV->record_out_of_memory_failure(); 524 return ciEnv::_unloaded_ciobjarrayklass; 525 } 526 int dimension = fd.dimension(); 527 assert(element_type != T_ARRAY, "unsuccessful decomposition"); 528 ciKlass* element_klass = NULL; 529 if (element_type == T_OBJECT) { 530 ciEnv *env = CURRENT_THREAD_ENV; 531 ciSymbol* ci_name = env->get_symbol(fd.object_key()); 532 element_klass = 533 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass(); 534 } else { 535 assert(dimension > 1, "one dimensional type arrays are always loaded."); 536 537 // The type array itself takes care of one of the dimensions. 538 dimension--; 539 540 // The element klass is a TypeArrayKlass. 541 element_klass = ciTypeArrayKlass::make(element_type); 542 } 543 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension); 544 } else { 545 jobject loader_handle = NULL; 546 jobject domain_handle = NULL; 547 if (accessing_klass != NULL) { 548 loader_handle = accessing_klass->loader_handle(); 549 domain_handle = accessing_klass->protection_domain_handle(); 550 } 551 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle); 552 } 553 init_ident_of(new_klass); 554 _unloaded_klasses->append(new_klass); 555 556 return new_klass; 557 } 558 559 560 //------------------------------------------------------------------ 561 // ciObjectFactory::get_unloaded_instance 562 // 563 // Get a ciInstance representing an as-yet undetermined instance of a given class. 564 // 565 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) { 566 for (int i=0; i<_unloaded_instances->length(); i++) { 567 ciInstance* entry = _unloaded_instances->at(i); 568 if (entry->klass()->equals(instance_klass)) { 569 // We've found a match. 570 return entry; 571 } 572 } 573 574 // This is a new unloaded instance. Create it and stick it in 575 // the cache. 576 ciInstance* new_instance = new (arena()) ciInstance(instance_klass); 577 578 init_ident_of(new_instance); 579 _unloaded_instances->append(new_instance); 580 581 // make sure it looks the way we want: 582 assert(!new_instance->is_loaded(), ""); 583 assert(new_instance->klass() == instance_klass, ""); 584 585 return new_instance; 586 } 587 588 589 //------------------------------------------------------------------ 590 // ciObjectFactory::get_unloaded_klass_mirror 591 // 592 // Get a ciInstance representing an unresolved klass mirror. 593 // 594 // Currently, this ignores the parameters and returns a unique unloaded instance. 595 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) { 596 assert(ciEnv::_Class_klass != NULL, ""); 597 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass()); 598 } 599 600 //------------------------------------------------------------------ 601 // ciObjectFactory::get_unloaded_method_handle_constant 602 // 603 // Get a ciInstance representing an unresolved method handle constant. 604 // 605 // Currently, this ignores the parameters and returns a unique unloaded instance. 606 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder, 607 ciSymbol* name, 608 ciSymbol* signature, 609 int ref_kind) { 610 if (ciEnv::_MethodHandle_klass == NULL) return NULL; 611 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass()); 612 } 613 614 //------------------------------------------------------------------ 615 // ciObjectFactory::get_unloaded_method_type_constant 616 // 617 // Get a ciInstance representing an unresolved method type constant. 618 // 619 // Currently, this ignores the parameters and returns a unique unloaded instance. 620 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) { 621 if (ciEnv::_MethodType_klass == NULL) return NULL; 622 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass()); 623 } 624 625 ciInstance* ciObjectFactory::get_unloaded_object_constant() { 626 if (ciEnv::_Object_klass == NULL) return NULL; 627 return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass()); 628 } 629 630 //------------------------------------------------------------------ 631 // ciObjectFactory::get_empty_methodData 632 // 633 // Get the ciMethodData representing the methodData for a method with 634 // none. 635 ciMethodData* ciObjectFactory::get_empty_methodData() { 636 ciMethodData* new_methodData = new (arena()) ciMethodData(); 637 init_ident_of(new_methodData); 638 return new_methodData; 639 } 640 641 //------------------------------------------------------------------ 642 // ciObjectFactory::get_return_address 643 // 644 // Get a ciReturnAddress for a specified bci. 645 ciReturnAddress* ciObjectFactory::get_return_address(int bci) { 646 for (int i=0; i<_return_addresses->length(); i++) { 647 ciReturnAddress* entry = _return_addresses->at(i); 648 if (entry->bci() == bci) { 649 // We've found a match. 650 return entry; 651 } 652 } 653 654 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci); 655 init_ident_of(new_ret_addr); 656 _return_addresses->append(new_ret_addr); 657 return new_ret_addr; 658 } 659 660 // ------------------------------------------------------------------ 661 // ciObjectFactory::init_ident_of 662 void ciObjectFactory::init_ident_of(ciBaseObject* obj) { 663 obj->set_ident(_next_ident++); 664 } 665 666 static ciObjectFactory::NonPermObject* emptyBucket = NULL; 667 668 // ------------------------------------------------------------------ 669 // ciObjectFactory::find_non_perm 670 // 671 // Use a small hash table, hashed on the klass of the key. 672 // If there is no entry in the cache corresponding to this oop, return 673 // the null tail of the bucket into which the oop should be inserted. 674 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) { 675 assert(Universe::heap()->is_in_reserved(key), "must be"); 676 ciMetadata* klass = get_metadata(key->klass()); 677 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS]; 678 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) { 679 if (is_equal(p, key)) break; 680 } 681 return (*bp); 682 } 683 684 685 686 // ------------------------------------------------------------------ 687 // Code for for NonPermObject 688 // 689 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) { 690 assert(ciObjectFactory::is_initialized(), ""); 691 _object = object; 692 _next = bucket; 693 bucket = this; 694 } 695 696 697 698 // ------------------------------------------------------------------ 699 // ciObjectFactory::insert_non_perm 700 // 701 // Insert a ciObject into the non-perm table. 702 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) { 703 assert(Universe::heap()->is_in_reserved_or_null(key), "must be"); 704 assert(&where != &emptyBucket, "must not try to fill empty bucket"); 705 NonPermObject* p = new (arena()) NonPermObject(where, key, obj); 706 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match"); 707 assert(find_non_perm(key) == p, "must find the same spot"); 708 ++_non_perm_count; 709 } 710 711 // ------------------------------------------------------------------ 712 // ciObjectFactory::vm_symbol_at 713 // Get the ciSymbol corresponding to some index in vmSymbols. 714 ciSymbol* ciObjectFactory::vm_symbol_at(int index) { 715 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob"); 716 return _shared_ci_symbols[index]; 717 } 718 719 // ------------------------------------------------------------------ 720 // ciObjectFactory::metadata_do 721 void ciObjectFactory::metadata_do(void f(Metadata*)) { 722 if (_ci_metadata == NULL) return; 723 for (int j = 0; j< _ci_metadata->length(); j++) { 724 Metadata* o = _ci_metadata->at(j)->constant_encoding(); 725 f(o); 726 } 727 } 728 729 // ------------------------------------------------------------------ 730 // ciObjectFactory::print_contents_impl 731 void ciObjectFactory::print_contents_impl() { 732 int len = _ci_metadata->length(); 733 tty->print_cr("ciObjectFactory (%d) meta data contents:", len); 734 for (int i=0; i<len; i++) { 735 _ci_metadata->at(i)->print(); 736 tty->cr(); 737 } 738 } 739 740 // ------------------------------------------------------------------ 741 // ciObjectFactory::print_contents 742 void ciObjectFactory::print_contents() { 743 print(); 744 tty->cr(); 745 GUARDED_VM_ENTRY(print_contents_impl();) 746 } 747 748 // ------------------------------------------------------------------ 749 // ciObjectFactory::print 750 // 751 // Print debugging information about the object factory 752 void ciObjectFactory::print() { 753 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>", 754 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(), 755 _unloaded_instances->length(), 756 _unloaded_klasses->length()); 757 }