/*

 * 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

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 */

// 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 {

private:

  static volatile bool _initialized;

  static GrowableArray<ciObject*>* _shared_ci_objects;

  static ciSymbol*                 _shared_ci_symbols[];

  static int                       _shared_ident_limit;

  Arena*                    _arena;

  GrowableArray<ciObject*>* _ci_objects;

  GrowableArray<ciMethod*>* _unloaded_methods;

  GrowableArray<ciKlass*>* _unloaded_klasses;

  GrowableArray<ciInstance*>* _unloaded_instances;

  GrowableArray<ciReturnAddress*>* _return_addresses;

  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(oop key, GrowableArray<ciObject*>* objects);

  bool is_found_at(int index, oop key, GrowableArray<ciObject*>* objects);

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

  ciObject* create_new_object(oop 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(ciObject* 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();

  ciObjectFactory(Arena* arena, int expected_size);

  // Get the ciObject corresponding to some oop.

  ciObject* get(oop 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);

  // 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);

  void print_contents();

  void print();

};