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 /*

  * Copyright (c) 1999, 2012, 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.

  *

  */

 #ifndef SHARE_VM_CI_CIOBJECTFACTORY_HPP

 #define SHARE_VM_CI_CIOBJECTFACTORY_HPP

 #include "ci/ciClassList.hpp"

 #include "ci/ciObject.hpp"

 #include "utilities/growableArray.hpp"

 // 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 efficient implementation of ciObject.

 class ciObjectFactory : public ResourceObj {

   friend class VMStructs;

   friend class ciEnv;

 private:

   static volatile bool _initialized;

   static GrowableArray<ciMetadata*>* _shared_ci_metadata;

   static ciSymbol*                 _shared_ci_symbols[];

   static int                       _shared_ident_limit;

   Arena*                    _arena;

   GrowableArray<ciMetadata*>*        _ci_metadata;

   GrowableArray<ciMethod*>* _unloaded_methods;

   GrowableArray<ciKlass*>* _unloaded_klasses;

   GrowableArray<ciInstance*>* _unloaded_instances;

   GrowableArray<ciReturnAddress*>* _return_addresses;

   GrowableArray<ciSymbol*>* _symbols;  // keep list of symbols created

   int                       _next_ident;

 public:

   struct NonPermObject : public ResourceObj {

     ciObject*      _object;

     NonPermObject* _next;

     inline NonPermObject(NonPermObject* &bucket, oop key, ciObject* object);

     ciObject*     object()  { return _object; }

     NonPermObject* &next()  { return _next; }

   };

 private:

   enum { NON_PERM_BUCKETS = 61 };

   NonPermObject* _non_perm_bucket[NON_PERM_BUCKETS];

   int _non_perm_count;

   int find(Metadata* key, GrowableArray<ciMetadata*>* objects);

   bool is_found_at(int index, Metadata* key, GrowableArray<ciMetadata*>* objects);

   void insert(int index, ciMetadata* obj, GrowableArray<ciMetadata*>* objects);

   ciObject* create_new_object(oop o);

   ciMetadata* create_new_object(Metadata* o);

   static bool is_equal(NonPermObject* p, oop key) {

     return p->object()->get_oop() == key;

   }

   NonPermObject* &find_non_perm(oop key);

   void insert_non_perm(NonPermObject* &where, oop key, ciObject* obj);

   void init_ident_of(ciBaseObject* obj);

   Arena* arena() { return _arena; }

   void print_contents_impl();

   ciInstance* get_unloaded_instance(ciInstanceKlass* klass);

 public:

   static bool is_initialized() { return _initialized; }

   static void initialize();

   void init_shared_objects();

   void remove_symbols();

   ciObjectFactory(Arena* arena, int expected_size);

   // Get the ciObject corresponding to some oop.

   ciObject* get(oop key);

   ciMetadata* get_metadata(Metadata* key);

   ciSymbol* get_symbol(Symbol* key);

   // Get the ciSymbol corresponding to one of the vmSymbols.

   static ciSymbol* vm_symbol_at(int index);

   // Get the ciMethod representing an unloaded/unfound method.

   ciMethod* get_unloaded_method(ciInstanceKlass* holder,

                                 ciSymbol*        name,

                                 ciSymbol*        signature,

                                 ciInstanceKlass* accessor);

   // Get a ciKlass representing an unloaded klass.

   ciKlass* get_unloaded_klass(ciKlass* accessing_klass,

                               ciSymbol* name,

                               bool create_if_not_found);

   // Get a ciInstance representing an unresolved klass mirror.

   ciInstance* get_unloaded_klass_mirror(ciKlass* type);

   // Get a ciInstance representing an unresolved method handle constant.

   ciInstance* get_unloaded_method_handle_constant(ciKlass*  holder,

                                                   ciSymbol* name,

                                                   ciSymbol* signature,

                                                   int       ref_kind);

   // Get a ciInstance representing an unresolved method type constant.

   ciInstance* get_unloaded_method_type_constant(ciSymbol* signature);

   // Get the ciMethodData representing the methodData for a method

   // with none.

   ciMethodData* get_empty_methodData();

   ciReturnAddress* get_return_address(int bci);

   GrowableArray<ciMetadata*>* get_ci_metadata() const { return _ci_metadata; }

   // RedefineClasses support

   void metadata_do(void f(Metadata*));

   void print_contents();

   void print();

 };

 #endif // SHARE_VM_CI_CIOBJECTFACTORY_HPP