ciObjectFactory.cpp revision 3602:da91efe96a93
1/* 2 * Copyright (c) 1999, 2012, 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/ciNullObject.hpp" 34#include "ci/ciObjArray.hpp" 35#include "ci/ciObjArrayKlass.hpp" 36#include "ci/ciObject.hpp" 37#include "ci/ciObjectFactory.hpp" 38#include "ci/ciSymbol.hpp" 39#include "ci/ciTypeArray.hpp" 40#include "ci/ciTypeArrayKlass.hpp" 41#include "ci/ciUtilities.hpp" 42#include "classfile/systemDictionary.hpp" 43#include "gc_interface/collectedHeap.inline.hpp" 44#include "memory/allocation.inline.hpp" 45#include "oops/oop.inline.hpp" 46#include "oops/oop.inline2.hpp" 47#include "runtime/fieldType.hpp" 48 49// ciObjectFactory 50// 51// This class handles requests for the creation of new instances 52// of ciObject and its subclasses. It contains a caching mechanism 53// which ensures that for each oop, at most one ciObject is created. 54// This invariant allows more efficient implementation of ciObject. 55// 56// Implementation note: the oop->ciObject mapping is represented as 57// a table stored in an array. Even though objects are moved 58// by the garbage collector, the compactor preserves their relative 59// order; address comparison of oops (in perm space) is safe so long 60// as we prohibit GC during our comparisons. We currently use binary 61// search to find the oop in the table, and inserting a new oop 62// into the table may be costly. If this cost ends up being 63// problematic the underlying data structure can be switched to some 64// sort of balanced binary tree. 65 66GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL; 67ciSymbol* ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT]; 68int ciObjectFactory::_shared_ident_limit = 0; 69volatile bool ciObjectFactory::_initialized = false; 70 71 72// ------------------------------------------------------------------ 73// ciObjectFactory::ciObjectFactory 74ciObjectFactory::ciObjectFactory(Arena* arena, 75 int expected_size) { 76 77 for (int i = 0; i < NON_PERM_BUCKETS; i++) { 78 _non_perm_bucket[i] = NULL; 79 } 80 _non_perm_count = 0; 81 82 _next_ident = _shared_ident_limit; 83 _arena = arena; 84 _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL); 85 86 // If the shared ci objects exist append them to this factory's objects 87 88 if (_shared_ci_metadata != NULL) { 89 _ci_metadata->appendAll(_shared_ci_metadata); 90 } 91 92 _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL); 93 _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL); 94 _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL); 95 _return_addresses = 96 new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL); 97 98 _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL); 99} 100 101// ------------------------------------------------------------------ 102// ciObjectFactory::ciObjectFactory 103void ciObjectFactory::initialize() { 104 ASSERT_IN_VM; 105 JavaThread* thread = JavaThread::current(); 106 HandleMark handle_mark(thread); 107 108 // This Arena is long lived and exists in the resource mark of the 109 // compiler thread that initializes the initial ciObjectFactory which 110 // creates the shared ciObjects that all later ciObjectFactories use. 111 Arena* arena = new (mtCompiler) Arena(); 112 ciEnv initial(arena); 113 ciEnv* env = ciEnv::current(); 114 env->_factory->init_shared_objects(); 115 116 _initialized = true; 117 118} 119 120void ciObjectFactory::init_shared_objects() { 121 122 _next_ident = 1; // start numbering CI objects at 1 123 124 { 125 // Create the shared symbols, but not in _shared_ci_metadata. 126 int i; 127 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) { 128 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i); 129 assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping"); 130 ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i); 131 init_ident_of(sym); 132 _shared_ci_symbols[i] = sym; 133 } 134#ifdef ASSERT 135 for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) { 136 Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i); 137 ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i); 138 assert(sym->get_symbol() == vmsym, "oop must match"); 139 } 140 assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check"); 141#endif 142 } 143 144 _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL); 145 146 for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) { 147 BasicType t = (BasicType)i; 148 if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY && t != T_NARROWOOP) { 149 ciType::_basic_types[t] = new (_arena) ciType(t); 150 init_ident_of(ciType::_basic_types[t]); 151 } 152 } 153 154 ciEnv::_null_object_instance = new (_arena) ciNullObject(); 155 init_ident_of(ciEnv::_null_object_instance); 156 157#define WK_KLASS_DEFN(name, ignore_s, opt) \ 158 if (SystemDictionary::name() != NULL) \ 159 ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass(); 160 161 WK_KLASSES_DO(WK_KLASS_DEFN) 162#undef WK_KLASS_DEFN 163 164 for (int len = -1; len != _ci_metadata->length(); ) { 165 len = _ci_metadata->length(); 166 for (int i2 = 0; i2 < len; i2++) { 167 ciMetadata* obj = _ci_metadata->at(i2); 168 assert (obj->is_metadata(), "what else would it be?"); 169 if (obj->is_loaded() && obj->is_instance_klass()) { 170 obj->as_instance_klass()->compute_nonstatic_fields(); 171 } 172 } 173 } 174 175 ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol()); 176 // Create dummy InstanceKlass and objArrayKlass object and assign them idents 177 ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL); 178 init_ident_of(ciEnv::_unloaded_ciinstance_klass); 179 ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1); 180 init_ident_of(ciEnv::_unloaded_ciobjarrayklass); 181 assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking"); 182 183 get_metadata(Universe::boolArrayKlassObj()); 184 get_metadata(Universe::charArrayKlassObj()); 185 get_metadata(Universe::singleArrayKlassObj()); 186 get_metadata(Universe::doubleArrayKlassObj()); 187 get_metadata(Universe::byteArrayKlassObj()); 188 get_metadata(Universe::shortArrayKlassObj()); 189 get_metadata(Universe::intArrayKlassObj()); 190 get_metadata(Universe::longArrayKlassObj()); 191 192 193 194 assert(_non_perm_count == 0, "no shared non-perm objects"); 195 196 // The shared_ident_limit is the first ident number that will 197 // be used for non-shared objects. That is, numbers less than 198 // this limit are permanently assigned to shared CI objects, 199 // while the higher numbers are recycled afresh by each new ciEnv. 200 201 _shared_ident_limit = _next_ident; 202 _shared_ci_metadata = _ci_metadata; 203} 204 205 206ciSymbol* ciObjectFactory::get_symbol(Symbol* key) { 207 vmSymbols::SID sid = vmSymbols::find_sid(key); 208 if (sid != vmSymbols::NO_SID) { 209 // do not pollute the main cache with it 210 return vm_symbol_at(sid); 211 } 212 213 assert(vmSymbols::find_sid(key) == vmSymbols::NO_SID, ""); 214 ciSymbol* s = new (arena()) ciSymbol(key, vmSymbols::NO_SID); 215 _symbols->push(s); 216 return s; 217} 218 219// Decrement the refcount when done on symbols referenced by this compilation. 220void ciObjectFactory::remove_symbols() { 221 for (int i = 0; i < _symbols->length(); i++) { 222 ciSymbol* s = _symbols->at(i); 223 s->get_symbol()->decrement_refcount(); 224 } 225 // Since _symbols is resource allocated we're not allowed to delete it 226 // but it'll go away just the same. 227} 228 229// ------------------------------------------------------------------ 230// ciObjectFactory::get 231// 232// Get the ciObject corresponding to some oop. If the ciObject has 233// already been created, it is returned. Otherwise, a new ciObject 234// is created. 235ciObject* ciObjectFactory::get(oop key) { 236 ASSERT_IN_VM; 237 238 assert(key == NULL || Universe::heap()->is_in_reserved(key), "must be"); 239 240 NonPermObject* &bucket = find_non_perm(key); 241 if (bucket != NULL) { 242 return bucket->object(); 243 } 244 245 // The ciObject does not yet exist. Create it and insert it 246 // into the cache. 247 Handle keyHandle(key); 248 ciObject* new_object = create_new_object(keyHandle()); 249 assert(keyHandle() == new_object->get_oop(), "must be properly recorded"); 250 init_ident_of(new_object); 251 assert(Universe::heap()->is_in_reserved(new_object->get_oop()), "must be"); 252 253 // Not a perm-space object. 254 insert_non_perm(bucket, keyHandle(), new_object); 255 return new_object; 256 } 257 258// ------------------------------------------------------------------ 259// ciObjectFactory::get 260// 261// Get the ciObject corresponding to some oop. If the ciObject has 262// already been created, it is returned. Otherwise, a new ciObject 263// is created. 264ciMetadata* ciObjectFactory::get_metadata(Metadata* key) { 265 ASSERT_IN_VM; 266 267 assert(key == NULL || key->is_metadata(), "must be"); 268 269#ifdef ASSERT 270 if (CIObjectFactoryVerify) { 271 Metadata* last = NULL; 272 for (int j = 0; j< _ci_metadata->length(); j++) { 273 Metadata* o = _ci_metadata->at(j)->constant_encoding(); 274 assert(last < o, "out of order"); 275 last = o; 276 } 277 } 278#endif // ASSERT 279 int len = _ci_metadata->length(); 280 int index = find(key, _ci_metadata); 281#ifdef ASSERT 282 if (CIObjectFactoryVerify) { 283 for (int i=0; i<_ci_metadata->length(); i++) { 284 if (_ci_metadata->at(i)->constant_encoding() == key) { 285 assert(index == i, " bad lookup"); 286 } 287 } 288 } 289#endif 290 if (!is_found_at(index, key, _ci_metadata)) { 291 // The ciObject does not yet exist. Create it and insert it 292 // into the cache. 293 ciMetadata* new_object = create_new_object(key); 294 init_ident_of(new_object); 295 assert(new_object->is_metadata(), "must be"); 296 297 if (len != _ci_metadata->length()) { 298 // creating the new object has recursively entered new objects 299 // into the table. We need to recompute our index. 300 index = find(key, _ci_metadata); 301 } 302 assert(!is_found_at(index, key, _ci_metadata), "no double insert"); 303 insert(index, new_object, _ci_metadata); 304 return new_object; 305 } 306 return _ci_metadata->at(index)->as_metadata(); 307} 308 309// ------------------------------------------------------------------ 310// ciObjectFactory::create_new_object 311// 312// Create a new ciObject from an oop. 313// 314// Implementation note: this functionality could be virtual behavior 315// of the oop itself. For now, we explicitly marshal the object. 316ciObject* ciObjectFactory::create_new_object(oop o) { 317 EXCEPTION_CONTEXT; 318 319 if (o->is_instance()) { 320 instanceHandle h_i(THREAD, (instanceOop)o); 321 if (java_lang_invoke_CallSite::is_instance(o)) 322 return new (arena()) ciCallSite(h_i); 323 else if (java_lang_invoke_MemberName::is_instance(o)) 324 return new (arena()) ciMemberName(h_i); 325 else if (java_lang_invoke_MethodHandle::is_instance(o)) 326 return new (arena()) ciMethodHandle(h_i); 327 else 328 return new (arena()) ciInstance(h_i); 329 } else if (o->is_objArray()) { 330 objArrayHandle h_oa(THREAD, (objArrayOop)o); 331 return new (arena()) ciObjArray(h_oa); 332 } else if (o->is_typeArray()) { 333 typeArrayHandle h_ta(THREAD, (typeArrayOop)o); 334 return new (arena()) ciTypeArray(h_ta); 335 } 336 337 // The oop is of some type not supported by the compiler interface. 338 ShouldNotReachHere(); 339 return NULL; 340} 341 342// ------------------------------------------------------------------ 343// ciObjectFactory::create_new_object 344// 345// Create a new ciObject from a Metadata*. 346// 347// Implementation note: this functionality could be virtual behavior 348// of the oop itself. For now, we explicitly marshal the object. 349ciMetadata* ciObjectFactory::create_new_object(Metadata* o) { 350 EXCEPTION_CONTEXT; 351 352 if (o->is_klass()) { 353 KlassHandle h_k(THREAD, (Klass*)o); 354 Klass* k = (Klass*)o; 355 if (k->oop_is_instance()) { 356 return new (arena()) ciInstanceKlass(h_k); 357 } else if (k->oop_is_objArray()) { 358 return new (arena()) ciObjArrayKlass(h_k); 359 } else if (k->oop_is_typeArray()) { 360 return new (arena()) ciTypeArrayKlass(h_k); 361 } 362 } else if (o->is_method()) { 363 methodHandle h_m(THREAD, (Method*)o); 364 return new (arena()) ciMethod(h_m); 365 } else if (o->is_methodData()) { 366 // Hold methodHandle alive - might not be necessary ??? 367 methodHandle h_m(THREAD, ((MethodData*)o)->method()); 368 return new (arena()) ciMethodData((MethodData*)o); 369 } 370 371 // The oop is of some type not supported by the compiler interface. 372 ShouldNotReachHere(); 373 return NULL; 374} 375 376//------------------------------------------------------------------ 377// ciObjectFactory::get_unloaded_method 378// 379// Get the ciMethod representing an unloaded/unfound method. 380// 381// Implementation note: unloaded methods are currently stored in 382// an unordered array, requiring a linear-time lookup for each 383// unloaded method. This may need to change. 384ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder, 385 ciSymbol* name, 386 ciSymbol* signature, 387 ciInstanceKlass* accessor) { 388 ciSignature* that = NULL; 389 for (int i = 0; i < _unloaded_methods->length(); i++) { 390 ciMethod* entry = _unloaded_methods->at(i); 391 if (entry->holder()->equals(holder) && 392 entry->name()->equals(name) && 393 entry->signature()->as_symbol()->equals(signature)) { 394 // Short-circuit slow resolve. 395 if (entry->signature()->accessing_klass() == accessor) { 396 // We've found a match. 397 return entry; 398 } else { 399 // Lazily create ciSignature 400 if (that == NULL) that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature); 401 if (entry->signature()->equals(that)) { 402 // We've found a match. 403 return entry; 404 } 405 } 406 } 407 } 408 409 // This is a new unloaded method. Create it and stick it in 410 // the cache. 411 ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor); 412 413 init_ident_of(new_method); 414 _unloaded_methods->append(new_method); 415 416 return new_method; 417} 418 419//------------------------------------------------------------------ 420// ciObjectFactory::get_unloaded_klass 421// 422// Get a ciKlass representing an unloaded klass. 423// 424// Implementation note: unloaded klasses are currently stored in 425// an unordered array, requiring a linear-time lookup for each 426// unloaded klass. This may need to change. 427ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass, 428 ciSymbol* name, 429 bool create_if_not_found) { 430 EXCEPTION_CONTEXT; 431 oop loader = NULL; 432 oop domain = NULL; 433 if (accessing_klass != NULL) { 434 loader = accessing_klass->loader(); 435 domain = accessing_klass->protection_domain(); 436 } 437 for (int i=0; i<_unloaded_klasses->length(); i++) { 438 ciKlass* entry = _unloaded_klasses->at(i); 439 if (entry->name()->equals(name) && 440 entry->loader() == loader && 441 entry->protection_domain() == domain) { 442 // We've found a match. 443 return entry; 444 } 445 } 446 447 if (!create_if_not_found) 448 return NULL; 449 450 // This is a new unloaded klass. Create it and stick it in 451 // the cache. 452 ciKlass* new_klass = NULL; 453 454 // Two cases: this is an unloaded objArrayKlass or an 455 // unloaded InstanceKlass. Deal with both. 456 if (name->byte_at(0) == '[') { 457 // Decompose the name.' 458 FieldArrayInfo fd; 459 BasicType element_type = FieldType::get_array_info(name->get_symbol(), 460 fd, THREAD); 461 if (HAS_PENDING_EXCEPTION) { 462 CLEAR_PENDING_EXCEPTION; 463 CURRENT_THREAD_ENV->record_out_of_memory_failure(); 464 return ciEnv::_unloaded_ciobjarrayklass; 465 } 466 int dimension = fd.dimension(); 467 assert(element_type != T_ARRAY, "unsuccessful decomposition"); 468 ciKlass* element_klass = NULL; 469 if (element_type == T_OBJECT) { 470 ciEnv *env = CURRENT_THREAD_ENV; 471 ciSymbol* ci_name = env->get_symbol(fd.object_key()); 472 element_klass = 473 env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass(); 474 } else { 475 assert(dimension > 1, "one dimensional type arrays are always loaded."); 476 477 // The type array itself takes care of one of the dimensions. 478 dimension--; 479 480 // The element klass is a typeArrayKlass. 481 element_klass = ciTypeArrayKlass::make(element_type); 482 } 483 new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension); 484 } else { 485 jobject loader_handle = NULL; 486 jobject domain_handle = NULL; 487 if (accessing_klass != NULL) { 488 loader_handle = accessing_klass->loader_handle(); 489 domain_handle = accessing_klass->protection_domain_handle(); 490 } 491 new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle); 492 } 493 init_ident_of(new_klass); 494 _unloaded_klasses->append(new_klass); 495 496 return new_klass; 497} 498 499 500//------------------------------------------------------------------ 501// ciObjectFactory::get_unloaded_instance 502// 503// Get a ciInstance representing an as-yet undetermined instance of a given class. 504// 505ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) { 506 for (int i=0; i<_unloaded_instances->length(); i++) { 507 ciInstance* entry = _unloaded_instances->at(i); 508 if (entry->klass()->equals(instance_klass)) { 509 // We've found a match. 510 return entry; 511 } 512 } 513 514 // This is a new unloaded instance. Create it and stick it in 515 // the cache. 516 ciInstance* new_instance = new (arena()) ciInstance(instance_klass); 517 518 init_ident_of(new_instance); 519 _unloaded_instances->append(new_instance); 520 521 // make sure it looks the way we want: 522 assert(!new_instance->is_loaded(), ""); 523 assert(new_instance->klass() == instance_klass, ""); 524 525 return new_instance; 526} 527 528 529//------------------------------------------------------------------ 530// ciObjectFactory::get_unloaded_klass_mirror 531// 532// Get a ciInstance representing an unresolved klass mirror. 533// 534// Currently, this ignores the parameters and returns a unique unloaded instance. 535ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass* type) { 536 assert(ciEnv::_Class_klass != NULL, ""); 537 return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass()); 538} 539 540//------------------------------------------------------------------ 541// ciObjectFactory::get_unloaded_method_handle_constant 542// 543// Get a ciInstance representing an unresolved method handle constant. 544// 545// Currently, this ignores the parameters and returns a unique unloaded instance. 546ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass* holder, 547 ciSymbol* name, 548 ciSymbol* signature, 549 int ref_kind) { 550 if (ciEnv::_MethodHandle_klass == NULL) return NULL; 551 return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass()); 552} 553 554//------------------------------------------------------------------ 555// ciObjectFactory::get_unloaded_method_type_constant 556// 557// Get a ciInstance representing an unresolved method type constant. 558// 559// Currently, this ignores the parameters and returns a unique unloaded instance. 560ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) { 561 if (ciEnv::_MethodType_klass == NULL) return NULL; 562 return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass()); 563} 564 565 566 567//------------------------------------------------------------------ 568// ciObjectFactory::get_empty_methodData 569// 570// Get the ciMethodData representing the methodData for a method with 571// none. 572ciMethodData* ciObjectFactory::get_empty_methodData() { 573 ciMethodData* new_methodData = new (arena()) ciMethodData(); 574 init_ident_of(new_methodData); 575 return new_methodData; 576} 577 578//------------------------------------------------------------------ 579// ciObjectFactory::get_return_address 580// 581// Get a ciReturnAddress for a specified bci. 582ciReturnAddress* ciObjectFactory::get_return_address(int bci) { 583 for (int i=0; i<_return_addresses->length(); i++) { 584 ciReturnAddress* entry = _return_addresses->at(i); 585 if (entry->bci() == bci) { 586 // We've found a match. 587 return entry; 588 } 589 } 590 591 ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci); 592 init_ident_of(new_ret_addr); 593 _return_addresses->append(new_ret_addr); 594 return new_ret_addr; 595} 596 597// ------------------------------------------------------------------ 598// ciObjectFactory::init_ident_of 599void ciObjectFactory::init_ident_of(ciBaseObject* obj) { 600 obj->set_ident(_next_ident++); 601} 602 603// ------------------------------------------------------------------ 604// ciObjectFactory::find 605// 606// Use binary search to find the position of this oop in the cache. 607// If there is no entry in the cache corresponding to this oop, return 608// the position at which the oop should be inserted. 609int ciObjectFactory::find(Metadata* key, GrowableArray<ciMetadata*>* objects) { 610 int min = 0; 611 int max = objects->length()-1; 612 613 // print_contents(); 614 615 while (max >= min) { 616 int mid = (max + min) / 2; 617 Metadata* value = objects->at(mid)->constant_encoding(); 618 if (value < key) { 619 min = mid + 1; 620 } else if (value > key) { 621 max = mid - 1; 622 } else { 623 return mid; 624 } 625 } 626 return min; 627} 628 629// ------------------------------------------------------------------ 630// ciObjectFactory::is_found_at 631// 632// Verify that the binary seach found the given key. 633bool ciObjectFactory::is_found_at(int index, Metadata* key, GrowableArray<ciMetadata*>* objects) { 634 return (index < objects->length() && 635 objects->at(index)->constant_encoding() == key); 636} 637 638 639// ------------------------------------------------------------------ 640// ciObjectFactory::insert 641// 642// Insert a ciObject into the table at some index. 643void ciObjectFactory::insert(int index, ciMetadata* obj, GrowableArray<ciMetadata*>* objects) { 644 int len = objects->length(); 645 if (len == index) { 646 objects->append(obj); 647 } else { 648 objects->append(objects->at(len-1)); 649 int pos; 650 for (pos = len-2; pos >= index; pos--) { 651 objects->at_put(pos+1,objects->at(pos)); 652 } 653 objects->at_put(index, obj); 654 } 655} 656 657static ciObjectFactory::NonPermObject* emptyBucket = NULL; 658 659// ------------------------------------------------------------------ 660// ciObjectFactory::find_non_perm 661// 662// Use a small hash table, hashed on the klass of the key. 663// If there is no entry in the cache corresponding to this oop, return 664// the null tail of the bucket into which the oop should be inserted. 665ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) { 666 assert(Universe::heap()->is_in_reserved_or_null(key), "must be"); 667 ciMetadata* klass = get_metadata(key->klass()); 668 NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS]; 669 for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) { 670 if (is_equal(p, key)) break; 671 } 672 return (*bp); 673} 674 675 676 677// ------------------------------------------------------------------ 678// Code for for NonPermObject 679// 680inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) { 681 assert(ciObjectFactory::is_initialized(), ""); 682 _object = object; 683 _next = bucket; 684 bucket = this; 685} 686 687 688 689// ------------------------------------------------------------------ 690// ciObjectFactory::insert_non_perm 691// 692// Insert a ciObject into the non-perm table. 693void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) { 694 assert(Universe::heap()->is_in_reserved_or_null(key), "must be"); 695 assert(&where != &emptyBucket, "must not try to fill empty bucket"); 696 NonPermObject* p = new (arena()) NonPermObject(where, key, obj); 697 assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match"); 698 assert(find_non_perm(key) == p, "must find the same spot"); 699 ++_non_perm_count; 700} 701 702// ------------------------------------------------------------------ 703// ciObjectFactory::vm_symbol_at 704// Get the ciSymbol corresponding to some index in vmSymbols. 705ciSymbol* ciObjectFactory::vm_symbol_at(int index) { 706 assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob"); 707 return _shared_ci_symbols[index]; 708} 709 710// ------------------------------------------------------------------ 711// ciObjectFactory::metadata_do 712void ciObjectFactory::metadata_do(void f(Metadata*)) { 713 if (_ci_metadata == NULL) return; 714 for (int j = 0; j< _ci_metadata->length(); j++) { 715 Metadata* o = _ci_metadata->at(j)->constant_encoding(); 716 f(o); 717 } 718} 719 720// ------------------------------------------------------------------ 721// ciObjectFactory::print_contents_impl 722void ciObjectFactory::print_contents_impl() { 723 int len = _ci_metadata->length(); 724 tty->print_cr("ciObjectFactory (%d) meta data contents:", len); 725 for (int i=0; i<len; i++) { 726 _ci_metadata->at(i)->print(); 727 tty->cr(); 728 } 729} 730 731// ------------------------------------------------------------------ 732// ciObjectFactory::print_contents 733void ciObjectFactory::print_contents() { 734 print(); 735 tty->cr(); 736 GUARDED_VM_ENTRY(print_contents_impl();) 737} 738 739// ------------------------------------------------------------------ 740// ciObjectFactory::print 741// 742// Print debugging information about the object factory 743void ciObjectFactory::print() { 744 tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>", 745 _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(), 746 _unloaded_instances->length(), 747 _unloaded_klasses->length()); 748} 749