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