jdk8-mips64-public/hotspot: src/share/vm/ci/ciObjectFactory.cpp@2c6ef90f030a (annotated)

src/share/vm/ci/ciObjectFactory.cpp@2c6ef90f030a (annotated)

src/share/vm/ci/ciObjectFactory.cpp

Mon, 07 Jul 2014 10:12:40 +0200

author: stefank
date: Mon, 07 Jul 2014 10:12:40 +0200
changeset 6992: 2c6ef90f030a
parent 6198: 55fb97c4c58d
child 7074: 833b0f92429a
permissions: -rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

 /*
  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "ci/ciCallSite.hpp"
 #include "ci/ciInstance.hpp"
 #include "ci/ciInstanceKlass.hpp"
 #include "ci/ciMemberName.hpp"
 #include "ci/ciMethod.hpp"
 #include "ci/ciMethodData.hpp"
 #include "ci/ciMethodHandle.hpp"
 #include "ci/ciMethodType.hpp"
 #include "ci/ciNullObject.hpp"
 #include "ci/ciObjArray.hpp"
 #include "ci/ciObjArrayKlass.hpp"
 #include "ci/ciObject.hpp"
 #include "ci/ciObjectFactory.hpp"
 #include "ci/ciSymbol.hpp"
 #include "ci/ciTypeArray.hpp"
 #include "ci/ciTypeArrayKlass.hpp"
 #include "ci/ciUtilities.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "memory/allocation.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/oop.inline2.hpp"
 #include "runtime/fieldType.hpp"
 #if INCLUDE_ALL_GCS
 # include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
 #endif
 // ciObjectFactory
 //
 // This class handles requests for the creation of new instances
 // of ciObject and its subclasses.  It contains a caching mechanism
 // which ensures that for each oop, at most one ciObject is created.
 // This invariant allows more efficient implementation of ciObject.
 //
 // Implementation note: the oop->ciObject mapping is represented as
 // a table stored in an array.  Even though objects are moved
 // by the garbage collector, the compactor preserves their relative
 // order; address comparison of oops (in perm space) is safe so long
 // as we prohibit GC during our comparisons.  We currently use binary
 // search to find the oop in the table, and inserting a new oop
 // into the table may be costly.  If this cost ends up being
 // problematic the underlying data structure can be switched to some
 // sort of balanced binary tree.
 GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
 ciSymbol*                 ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT];
 int                       ciObjectFactory::_shared_ident_limit = 0;
 volatile bool             ciObjectFactory::_initialized = false;
 // ------------------------------------------------------------------
 // ciObjectFactory::ciObjectFactory
 ciObjectFactory::ciObjectFactory(Arena* arena,
                                  int expected_size) {
   for (int i = 0; i < NON_PERM_BUCKETS; i++) {
     _non_perm_bucket[i] = NULL;
   }
   _non_perm_count = 0;
   _next_ident = _shared_ident_limit;
   _arena = arena;
   _ci_metadata = new (arena) GrowableArray<ciMetadata*>(arena, expected_size, 0, NULL);
   // If the shared ci objects exist append them to this factory's objects
   if (_shared_ci_metadata != NULL) {
     _ci_metadata->appendAll(_shared_ci_metadata);
   }
   _unloaded_methods = new (arena) GrowableArray<ciMethod*>(arena, 4, 0, NULL);
   _unloaded_klasses = new (arena) GrowableArray<ciKlass*>(arena, 8, 0, NULL);
   _unloaded_instances = new (arena) GrowableArray<ciInstance*>(arena, 4, 0, NULL);
   _return_addresses =
     new (arena) GrowableArray<ciReturnAddress*>(arena, 8, 0, NULL);
   _symbols = new (arena) GrowableArray<ciSymbol*>(arena, 100, 0, NULL);
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::ciObjectFactory
 void ciObjectFactory::initialize() {
   ASSERT_IN_VM;
   JavaThread* thread = JavaThread::current();
   HandleMark  handle_mark(thread);
   // This Arena is long lived and exists in the resource mark of the
   // compiler thread that initializes the initial ciObjectFactory which
   // creates the shared ciObjects that all later ciObjectFactories use.
   Arena* arena = new (mtCompiler) Arena();
   ciEnv initial(arena);
   ciEnv* env = ciEnv::current();
   env->_factory->init_shared_objects();
   _initialized = true;
 }
 void ciObjectFactory::init_shared_objects() {
   _next_ident = 1;  // start numbering CI objects at 1
   {
     // Create the shared symbols, but not in _shared_ci_metadata.
     int i;
     for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
       Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
       assert(vmSymbols::find_sid(vmsym) == i, "1-1 mapping");
       ciSymbol* sym = new (_arena) ciSymbol(vmsym, (vmSymbols::SID) i);
       init_ident_of(sym);
       _shared_ci_symbols[i] = sym;
     }
 #ifdef ASSERT
     for (i = vmSymbols::FIRST_SID; i < vmSymbols::SID_LIMIT; i++) {
       Symbol* vmsym = vmSymbols::symbol_at((vmSymbols::SID) i);
       ciSymbol* sym = vm_symbol_at((vmSymbols::SID) i);
       assert(sym->get_symbol() == vmsym, "oop must match");
     }
     assert(ciSymbol::void_class_signature()->get_symbol() == vmSymbols::void_class_signature(), "spot check");
 #endif
   }
   _ci_metadata = new (_arena) GrowableArray<ciMetadata*>(_arena, 64, 0, NULL);
   for (int i = T_BOOLEAN; i <= T_CONFLICT; i++) {
     BasicType t = (BasicType)i;
     if (type2name(t) != NULL && t != T_OBJECT && t != T_ARRAY && t != T_NARROWOOP && t != T_NARROWKLASS) {
       ciType::_basic_types[t] = new (_arena) ciType(t);
       init_ident_of(ciType::_basic_types[t]);
     }
   }
   ciEnv::_null_object_instance = new (_arena) ciNullObject();
   init_ident_of(ciEnv::_null_object_instance);
 #define WK_KLASS_DEFN(name, ignore_s, opt)                              \
   if (SystemDictionary::name() != NULL) \
     ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass();
   WK_KLASSES_DO(WK_KLASS_DEFN)
 #undef WK_KLASS_DEFN
   for (int len = -1; len != _ci_metadata->length(); ) {
     len = _ci_metadata->length();
     for (int i2 = 0; i2 < len; i2++) {
       ciMetadata* obj = _ci_metadata->at(i2);
       assert (obj->is_metadata(), "what else would it be?");
       if (obj->is_loaded() && obj->is_instance_klass()) {
         obj->as_instance_klass()->compute_nonstatic_fields();
       }
     }
   }
   ciEnv::_unloaded_cisymbol = ciObjectFactory::get_symbol(vmSymbols::dummy_symbol());
   // Create dummy InstanceKlass and ObjArrayKlass object and assign them idents
   ciEnv::_unloaded_ciinstance_klass = new (_arena) ciInstanceKlass(ciEnv::_unloaded_cisymbol, NULL, NULL);
   init_ident_of(ciEnv::_unloaded_ciinstance_klass);
   ciEnv::_unloaded_ciobjarrayklass = new (_arena) ciObjArrayKlass(ciEnv::_unloaded_cisymbol, ciEnv::_unloaded_ciinstance_klass, 1);
   init_ident_of(ciEnv::_unloaded_ciobjarrayklass);
   assert(ciEnv::_unloaded_ciobjarrayklass->is_obj_array_klass(), "just checking");
   get_metadata(Universe::boolArrayKlassObj());
   get_metadata(Universe::charArrayKlassObj());
   get_metadata(Universe::singleArrayKlassObj());
   get_metadata(Universe::doubleArrayKlassObj());
   get_metadata(Universe::byteArrayKlassObj());
   get_metadata(Universe::shortArrayKlassObj());
   get_metadata(Universe::intArrayKlassObj());
   get_metadata(Universe::longArrayKlassObj());
   assert(_non_perm_count == 0, "no shared non-perm objects");
   // The shared_ident_limit is the first ident number that will
   // be used for non-shared objects.  That is, numbers less than
   // this limit are permanently assigned to shared CI objects,
   // while the higher numbers are recycled afresh by each new ciEnv.
   _shared_ident_limit = _next_ident;
   _shared_ci_metadata = _ci_metadata;
 }
 ciSymbol* ciObjectFactory::get_symbol(Symbol* key) {
   vmSymbols::SID sid = vmSymbols::find_sid(key);
   if (sid != vmSymbols::NO_SID) {
     // do not pollute the main cache with it
     return vm_symbol_at(sid);
   }
   assert(vmSymbols::find_sid(key) == vmSymbols::NO_SID, "");
   ciSymbol* s = new (arena()) ciSymbol(key, vmSymbols::NO_SID);
   _symbols->push(s);
   return s;
 }
 // Decrement the refcount when done on symbols referenced by this compilation.
 void ciObjectFactory::remove_symbols() {
   for (int i = 0; i < _symbols->length(); i++) {
     ciSymbol* s = _symbols->at(i);
     s->get_symbol()->decrement_refcount();
   }
   // Since _symbols is resource allocated we're not allowed to delete it
   // but it'll go away just the same.
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::get
 //
 // Get the ciObject corresponding to some oop.  If the ciObject has
 // already been created, it is returned.  Otherwise, a new ciObject
 // is created.
 ciObject* ciObjectFactory::get(oop key) {
   ASSERT_IN_VM;
   assert(key == NULL || Universe::heap()->is_in_reserved(key), "must be");
   NonPermObject* &bucket = find_non_perm(key);
   if (bucket != NULL) {
     return bucket->object();
   }
   // The ciObject does not yet exist.  Create it and insert it
   // into the cache.
   Handle keyHandle(key);
   ciObject* new_object = create_new_object(keyHandle());
   assert(keyHandle() == new_object->get_oop(), "must be properly recorded");
   init_ident_of(new_object);
   assert(Universe::heap()->is_in_reserved(new_object->get_oop()), "must be");
   // Not a perm-space object.
   insert_non_perm(bucket, keyHandle(), new_object);
   return new_object;
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::get
 //
 // Get the ciObject corresponding to some oop.  If the ciObject has
 // already been created, it is returned.  Otherwise, a new ciObject
 // is created.
 ciMetadata* ciObjectFactory::get_metadata(Metadata* key) {
   ASSERT_IN_VM;
 #ifdef ASSERT
   if (CIObjectFactoryVerify) {
     Metadata* last = NULL;
     for (int j = 0; j< _ci_metadata->length(); j++) {
       Metadata* o = _ci_metadata->at(j)->constant_encoding();
       assert(last < o, "out of order");
       last = o;
     }
   }
 #endif // ASSERT
   int len = _ci_metadata->length();
   int index = find(key, _ci_metadata);
 #ifdef ASSERT
   if (CIObjectFactoryVerify) {
     for (int i=0; i<_ci_metadata->length(); i++) {
       if (_ci_metadata->at(i)->constant_encoding() == key) {
         assert(index == i, " bad lookup");
       }
     }
   }
 #endif
   if (!is_found_at(index, key, _ci_metadata)) {
     // The ciObject does not yet exist.  Create it and insert it
     // into the cache.
     ciMetadata* new_object = create_new_object(key);
     init_ident_of(new_object);
     assert(new_object->is_metadata(), "must be");
     if (len != _ci_metadata->length()) {
       // creating the new object has recursively entered new objects
       // into the table.  We need to recompute our index.
       index = find(key, _ci_metadata);
     }
     assert(!is_found_at(index, key, _ci_metadata), "no double insert");
     insert(index, new_object, _ci_metadata);
     return new_object;
   }
   return _ci_metadata->at(index)->as_metadata();
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::create_new_object
 //
 // Create a new ciObject from an oop.
 //
 // Implementation note: this functionality could be virtual behavior
 // of the oop itself.  For now, we explicitly marshal the object.
 ciObject* ciObjectFactory::create_new_object(oop o) {
   EXCEPTION_CONTEXT;
   if (o->is_instance()) {
     instanceHandle h_i(THREAD, (instanceOop)o);
     if (java_lang_invoke_CallSite::is_instance(o))
       return new (arena()) ciCallSite(h_i);
     else if (java_lang_invoke_MemberName::is_instance(o))
       return new (arena()) ciMemberName(h_i);
     else if (java_lang_invoke_MethodHandle::is_instance(o))
       return new (arena()) ciMethodHandle(h_i);
     else if (java_lang_invoke_MethodType::is_instance(o))
       return new (arena()) ciMethodType(h_i);
     else
       return new (arena()) ciInstance(h_i);
   } else if (o->is_objArray()) {
     objArrayHandle h_oa(THREAD, (objArrayOop)o);
     return new (arena()) ciObjArray(h_oa);
   } else if (o->is_typeArray()) {
     typeArrayHandle h_ta(THREAD, (typeArrayOop)o);
     return new (arena()) ciTypeArray(h_ta);
   }
   // The oop is of some type not supported by the compiler interface.
   ShouldNotReachHere();
   return NULL;
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::create_new_object
 //
 // Create a new ciObject from a Metadata*.
 //
 // Implementation note: this functionality could be virtual behavior
 // of the oop itself.  For now, we explicitly marshal the object.
 ciMetadata* ciObjectFactory::create_new_object(Metadata* o) {
   EXCEPTION_CONTEXT;
   if (o->is_klass()) {
     KlassHandle h_k(THREAD, (Klass*)o);
     Klass* k = (Klass*)o;
     if (k->oop_is_instance()) {
       return new (arena()) ciInstanceKlass(h_k);
     } else if (k->oop_is_objArray()) {
       return new (arena()) ciObjArrayKlass(h_k);
     } else if (k->oop_is_typeArray()) {
       return new (arena()) ciTypeArrayKlass(h_k);
     }
   } else if (o->is_method()) {
     methodHandle h_m(THREAD, (Method*)o);
     return new (arena()) ciMethod(h_m);
   } else if (o->is_methodData()) {
     // Hold methodHandle alive - might not be necessary ???
     methodHandle h_m(THREAD, ((MethodData*)o)->method());
     return new (arena()) ciMethodData((MethodData*)o);
   }
   // The oop is of some type not supported by the compiler interface.
   ShouldNotReachHere();
   return NULL;
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::ensure_metadata_alive
 //
 // Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
 // This is primarily useful for metadata which is considered as weak roots
 // by the GC but need to be strong roots if reachable from a current compilation.
 //
 void ciObjectFactory::ensure_metadata_alive(ciMetadata* m) {
   ASSERT_IN_VM; // We're handling raw oops here.
 #if INCLUDE_ALL_GCS
   if (!UseG1GC) {
     return;
   }
   Klass* metadata_owner_klass;
   if (m->is_klass()) {
     metadata_owner_klass = m->as_klass()->get_Klass();
   } else if (m->is_method()) {
     metadata_owner_klass = m->as_method()->get_Method()->constants()->pool_holder();
   } else {
     fatal("Not implemented for other types of metadata");
   }
   oop metadata_holder = metadata_owner_klass->klass_holder();
   if (metadata_holder != NULL) {
     G1SATBCardTableModRefBS::enqueue(metadata_holder);
   }
 #endif
 }
 //------------------------------------------------------------------
 // ciObjectFactory::get_unloaded_method
 //
 // Get the ciMethod representing an unloaded/unfound method.
 //
 // Implementation note: unloaded methods are currently stored in
 // an unordered array, requiring a linear-time lookup for each
 // unloaded method.  This may need to change.
 ciMethod* ciObjectFactory::get_unloaded_method(ciInstanceKlass* holder,
                                                ciSymbol*        name,
                                                ciSymbol*        signature,
                                                ciInstanceKlass* accessor) {
   ciSignature* that = NULL;
   for (int i = 0; i < _unloaded_methods->length(); i++) {
     ciMethod* entry = _unloaded_methods->at(i);
     if (entry->holder()->equals(holder) &&
         entry->name()->equals(name) &&
         entry->signature()->as_symbol()->equals(signature)) {
       // Short-circuit slow resolve.
       if (entry->signature()->accessing_klass() == accessor) {
         // We've found a match.
         return entry;
       } else {
         // Lazily create ciSignature
         if (that == NULL)  that = new (arena()) ciSignature(accessor, constantPoolHandle(), signature);
         if (entry->signature()->equals(that)) {
           // We've found a match.
           return entry;
         }
       }
     }
   }
   // This is a new unloaded method.  Create it and stick it in
   // the cache.
   ciMethod* new_method = new (arena()) ciMethod(holder, name, signature, accessor);
   init_ident_of(new_method);
   _unloaded_methods->append(new_method);
   return new_method;
 }
 //------------------------------------------------------------------
 // ciObjectFactory::get_unloaded_klass
 //
 // Get a ciKlass representing an unloaded klass.
 //
 // Implementation note: unloaded klasses are currently stored in
 // an unordered array, requiring a linear-time lookup for each
 // unloaded klass.  This may need to change.
 ciKlass* ciObjectFactory::get_unloaded_klass(ciKlass* accessing_klass,
                                              ciSymbol* name,
                                              bool create_if_not_found) {
   EXCEPTION_CONTEXT;
   oop loader = NULL;
   oop domain = NULL;
   if (accessing_klass != NULL) {
     loader = accessing_klass->loader();
     domain = accessing_klass->protection_domain();
   }
   for (int i=0; i<_unloaded_klasses->length(); i++) {
     ciKlass* entry = _unloaded_klasses->at(i);
     if (entry->name()->equals(name) &&
         entry->loader() == loader &&
         entry->protection_domain() == domain) {
       // We've found a match.
       return entry;
     }
   }
   if (!create_if_not_found)
     return NULL;
   // This is a new unloaded klass.  Create it and stick it in
   // the cache.
   ciKlass* new_klass = NULL;
   // Two cases: this is an unloaded ObjArrayKlass or an
   // unloaded InstanceKlass.  Deal with both.
   if (name->byte_at(0) == '[') {
     // Decompose the name.'
     FieldArrayInfo fd;
     BasicType element_type = FieldType::get_array_info(name->get_symbol(),
                                                        fd, THREAD);
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
       CURRENT_THREAD_ENV->record_out_of_memory_failure();
       return ciEnv::_unloaded_ciobjarrayklass;
     }
     int dimension = fd.dimension();
     assert(element_type != T_ARRAY, "unsuccessful decomposition");
     ciKlass* element_klass = NULL;
     if (element_type == T_OBJECT) {
       ciEnv *env = CURRENT_THREAD_ENV;
       ciSymbol* ci_name = env->get_symbol(fd.object_key());
       element_klass =
         env->get_klass_by_name(accessing_klass, ci_name, false)->as_instance_klass();
     } else {
       assert(dimension > 1, "one dimensional type arrays are always loaded.");
       // The type array itself takes care of one of the dimensions.
       dimension--;
       // The element klass is a TypeArrayKlass.
       element_klass = ciTypeArrayKlass::make(element_type);
     }
     new_klass = new (arena()) ciObjArrayKlass(name, element_klass, dimension);
   } else {
     jobject loader_handle = NULL;
     jobject domain_handle = NULL;
     if (accessing_klass != NULL) {
       loader_handle = accessing_klass->loader_handle();
       domain_handle = accessing_klass->protection_domain_handle();
     }
     new_klass = new (arena()) ciInstanceKlass(name, loader_handle, domain_handle);
   }
   init_ident_of(new_klass);
   _unloaded_klasses->append(new_klass);
   return new_klass;
 }
 //------------------------------------------------------------------
 // ciObjectFactory::get_unloaded_instance
 //
 // Get a ciInstance representing an as-yet undetermined instance of a given class.
 //
 ciInstance* ciObjectFactory::get_unloaded_instance(ciInstanceKlass* instance_klass) {
   for (int i=0; i<_unloaded_instances->length(); i++) {
     ciInstance* entry = _unloaded_instances->at(i);
     if (entry->klass()->equals(instance_klass)) {
       // We've found a match.
       return entry;
     }
   }
   // This is a new unloaded instance.  Create it and stick it in
   // the cache.
   ciInstance* new_instance = new (arena()) ciInstance(instance_klass);
   init_ident_of(new_instance);
   _unloaded_instances->append(new_instance);
   // make sure it looks the way we want:
   assert(!new_instance->is_loaded(), "");
   assert(new_instance->klass() == instance_klass, "");
   return new_instance;
 }
 //------------------------------------------------------------------
 // ciObjectFactory::get_unloaded_klass_mirror
 //
 // Get a ciInstance representing an unresolved klass mirror.
 //
 // Currently, this ignores the parameters and returns a unique unloaded instance.
 ciInstance* ciObjectFactory::get_unloaded_klass_mirror(ciKlass*  type) {
   assert(ciEnv::_Class_klass != NULL, "");
   return get_unloaded_instance(ciEnv::_Class_klass->as_instance_klass());
 }
 //------------------------------------------------------------------
 // ciObjectFactory::get_unloaded_method_handle_constant
 //
 // Get a ciInstance representing an unresolved method handle constant.
 //
 // Currently, this ignores the parameters and returns a unique unloaded instance.
 ciInstance* ciObjectFactory::get_unloaded_method_handle_constant(ciKlass*  holder,
                                                                  ciSymbol* name,
                                                                  ciSymbol* signature,
                                                                  int       ref_kind) {
   if (ciEnv::_MethodHandle_klass == NULL)  return NULL;
   return get_unloaded_instance(ciEnv::_MethodHandle_klass->as_instance_klass());
 }
 //------------------------------------------------------------------
 // ciObjectFactory::get_unloaded_method_type_constant
 //
 // Get a ciInstance representing an unresolved method type constant.
 //
 // Currently, this ignores the parameters and returns a unique unloaded instance.
 ciInstance* ciObjectFactory::get_unloaded_method_type_constant(ciSymbol* signature) {
   if (ciEnv::_MethodType_klass == NULL)  return NULL;
   return get_unloaded_instance(ciEnv::_MethodType_klass->as_instance_klass());
 }
 ciInstance* ciObjectFactory::get_unloaded_object_constant() {
   if (ciEnv::_Object_klass == NULL)  return NULL;
   return get_unloaded_instance(ciEnv::_Object_klass->as_instance_klass());
 }
 //------------------------------------------------------------------
 // ciObjectFactory::get_empty_methodData
 //
 // Get the ciMethodData representing the methodData for a method with
 // none.
 ciMethodData* ciObjectFactory::get_empty_methodData() {
   ciMethodData* new_methodData = new (arena()) ciMethodData();
   init_ident_of(new_methodData);
   return new_methodData;
 }
 //------------------------------------------------------------------
 // ciObjectFactory::get_return_address
 //
 // Get a ciReturnAddress for a specified bci.
 ciReturnAddress* ciObjectFactory::get_return_address(int bci) {
   for (int i=0; i<_return_addresses->length(); i++) {
     ciReturnAddress* entry = _return_addresses->at(i);
     if (entry->bci() == bci) {
       // We've found a match.
       return entry;
     }
   }
   ciReturnAddress* new_ret_addr = new (arena()) ciReturnAddress(bci);
   init_ident_of(new_ret_addr);
   _return_addresses->append(new_ret_addr);
   return new_ret_addr;
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::init_ident_of
 void ciObjectFactory::init_ident_of(ciBaseObject* obj) {
   obj->set_ident(_next_ident++);
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::find
 //
 // Use binary search to find the position of this oop in the cache.
 // If there is no entry in the cache corresponding to this oop, return
 // the position at which the oop should be inserted.
 int ciObjectFactory::find(Metadata* key, GrowableArray<ciMetadata*>* objects) {
   int min = 0;
   int max = objects->length()-1;
   // print_contents();
   while (max >= min) {
     int mid = (max + min) / 2;
     Metadata* value = objects->at(mid)->constant_encoding();
     if (value < key) {
       min = mid + 1;
     } else if (value > key) {
       max = mid - 1;
     } else {
       return mid;
     }
   }
   return min;
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::is_found_at
 //
 // Verify that the binary seach found the given key.
 bool ciObjectFactory::is_found_at(int index, Metadata* key, GrowableArray<ciMetadata*>* objects) {
   return (index < objects->length() &&
           objects->at(index)->constant_encoding() == key);
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::insert
 //
 // Insert a ciObject into the table at some index.
 void ciObjectFactory::insert(int index, ciMetadata* obj, GrowableArray<ciMetadata*>* objects) {
   int len = objects->length();
   if (len == index) {
     objects->append(obj);
   } else {
     objects->append(objects->at(len-1));
     int pos;
     for (pos = len-2; pos >= index; pos--) {
       objects->at_put(pos+1,objects->at(pos));
     }
     objects->at_put(index, obj);
   }
 }
 static ciObjectFactory::NonPermObject* emptyBucket = NULL;
 // ------------------------------------------------------------------
 // ciObjectFactory::find_non_perm
 //
 // Use a small hash table, hashed on the klass of the key.
 // If there is no entry in the cache corresponding to this oop, return
 // the null tail of the bucket into which the oop should be inserted.
 ciObjectFactory::NonPermObject* &ciObjectFactory::find_non_perm(oop key) {
   assert(Universe::heap()->is_in_reserved_or_null(key), "must be");
   ciMetadata* klass = get_metadata(key->klass());
   NonPermObject* *bp = &_non_perm_bucket[(unsigned) klass->hash() % NON_PERM_BUCKETS];
   for (NonPermObject* p; (p = (*bp)) != NULL; bp = &p->next()) {
     if (is_equal(p, key))  break;
   }
   return (*bp);
 }
 // ------------------------------------------------------------------
 // Code for for NonPermObject
 //
 inline ciObjectFactory::NonPermObject::NonPermObject(ciObjectFactory::NonPermObject* &bucket, oop key, ciObject* object) {
   assert(ciObjectFactory::is_initialized(), "");
   _object = object;
   _next = bucket;
   bucket = this;
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::insert_non_perm
 //
 // Insert a ciObject into the non-perm table.
 void ciObjectFactory::insert_non_perm(ciObjectFactory::NonPermObject* &where, oop key, ciObject* obj) {
   assert(Universe::heap()->is_in_reserved_or_null(key), "must be");
   assert(&where != &emptyBucket, "must not try to fill empty bucket");
   NonPermObject* p = new (arena()) NonPermObject(where, key, obj);
   assert(where == p && is_equal(p, key) && p->object() == obj, "entry must match");
   assert(find_non_perm(key) == p, "must find the same spot");
   ++_non_perm_count;
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::vm_symbol_at
 // Get the ciSymbol corresponding to some index in vmSymbols.
 ciSymbol* ciObjectFactory::vm_symbol_at(int index) {
   assert(index >= vmSymbols::FIRST_SID && index < vmSymbols::SID_LIMIT, "oob");
   return _shared_ci_symbols[index];
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::metadata_do
 void ciObjectFactory::metadata_do(void f(Metadata*)) {
   if (_ci_metadata == NULL) return;
   for (int j = 0; j< _ci_metadata->length(); j++) {
     Metadata* o = _ci_metadata->at(j)->constant_encoding();
     f(o);
   }
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::print_contents_impl
 void ciObjectFactory::print_contents_impl() {
   int len = _ci_metadata->length();
   tty->print_cr("ciObjectFactory (%d) meta data contents:", len);
   for (int i=0; i<len; i++) {
     _ci_metadata->at(i)->print();
     tty->cr();
   }
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::print_contents
 void ciObjectFactory::print_contents() {
   print();
   tty->cr();
   GUARDED_VM_ENTRY(print_contents_impl();)
 }
 // ------------------------------------------------------------------
 // ciObjectFactory::print
 //
 // Print debugging information about the object factory
 void ciObjectFactory::print() {
   tty->print("<ciObjectFactory oops=%d metadata=%d unloaded_methods=%d unloaded_instances=%d unloaded_klasses=%d>",
              _non_perm_count, _ci_metadata->length(), _unloaded_methods->length(),
              _unloaded_instances->length(),
              _unloaded_klasses->length());
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciObjectFactory.cpp@2c6ef90f030a (annotated)

src/share/vm/ci/ciObjectFactory.cpp