1 /*
   2  * Copyright (c) 1999, 2011, 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 #ifndef SHARE_VM_CI_CIOBJECTFACTORY_HPP
  26 #define SHARE_VM_CI_CIOBJECTFACTORY_HPP
  27 
  28 #include "ci/ciClassList.hpp"
  29 #include "ci/ciObject.hpp"
  30 #include "utilities/growableArray.hpp"
  31 
  32 // ciObjectFactory
  33 //
  34 // This class handles requests for the creation of new instances
  35 // of ciObject and its subclasses.  It contains a caching mechanism
  36 // which ensures that for each oop, at most one ciObject is created.
  37 // This invariant allows efficient implementation of ciObject.
  38 class ciObjectFactory : public ResourceObj {
  39 private:
  40   static volatile bool _initialized;
  41   static GrowableArray<ciObject*>* _shared_ci_objects;
  42   static ciSymbol*                 _shared_ci_symbols[];
  43   static int                       _shared_ident_limit;
  44 
  45   Arena*                    _arena;
  46   GrowableArray<ciObject*>* _ci_objects;
  47   GrowableArray<ciMethod*>* _unloaded_methods;
  48   GrowableArray<ciKlass*>* _unloaded_klasses;
  49   GrowableArray<ciInstance*>* _unloaded_instances;
  50   GrowableArray<ciReturnAddress*>* _return_addresses;
  51   GrowableArray<ciSymbol*>* _symbols;  // keep list of symbols created
  52   int                       _next_ident;
  53 
  54 public:
  55   struct NonPermObject : public ResourceObj {
  56     ciObject*      _object;
  57     NonPermObject* _next;
  58 
  59     inline NonPermObject(NonPermObject* &bucket, oop key, ciObject* object);
  60     ciObject*     object()  { return _object; }
  61     NonPermObject* &next()  { return _next; }
  62   };
  63 private:
  64   enum { NON_PERM_BUCKETS = 61 };
  65   NonPermObject* _non_perm_bucket[NON_PERM_BUCKETS];
  66   int _non_perm_count;
  67 
  68   int find(oop key, GrowableArray<ciObject*>* objects);
  69   bool is_found_at(int index, oop key, GrowableArray<ciObject*>* objects);
  70   void insert(int index, ciObject* obj, GrowableArray<ciObject*>* objects);
  71   ciObject* create_new_object(oop o);
  72   static bool is_equal(NonPermObject* p, oop key) {
  73     return p->object()->get_oop() == key;
  74   }
  75 
  76   NonPermObject* &find_non_perm(oop key);
  77   void insert_non_perm(NonPermObject* &where, oop key, ciObject* obj);
  78 
  79   void init_ident_of(ciObject* obj);
  80   void init_ident_of(ciSymbol* obj);
  81 
  82   Arena* arena() { return _arena; }
  83 
  84   void print_contents_impl();
  85 
  86   ciInstance* get_unloaded_instance(ciInstanceKlass* klass);
  87 
  88 public:
  89   static bool is_initialized() { return _initialized; }
  90 
  91   static void initialize();
  92   void init_shared_objects();
  93   void remove_symbols();
  94 
  95   ciObjectFactory(Arena* arena, int expected_size);
  96 
  97   // Get the ciObject corresponding to some oop.
  98   ciObject* get(oop key);
  99 
 100   ciSymbol* get_symbol(Symbol* key);
 101 
 102   // Get the ciSymbol corresponding to one of the vmSymbols.
 103   static ciSymbol* vm_symbol_at(int index);
 104 
 105   // Get the ciMethod representing an unloaded/unfound method.
 106   ciMethod* get_unloaded_method(ciInstanceKlass* holder,
 107                                 ciSymbol*        name,
 108                                 ciSymbol*        signature);
 109 
 110   // Get a ciKlass representing an unloaded klass.
 111   ciKlass* get_unloaded_klass(ciKlass* accessing_klass,
 112                               ciSymbol* name,
 113                               bool create_if_not_found);
 114 
 115   // Get a ciInstance representing an unresolved klass mirror.
 116   ciInstance* get_unloaded_klass_mirror(ciKlass* type);
 117 
 118   // Get a ciInstance representing an unresolved method handle constant.
 119   ciInstance* get_unloaded_method_handle_constant(ciKlass*  holder,
 120                                                   ciSymbol* name,
 121                                                   ciSymbol* signature,
 122                                                   int       ref_kind);
 123 
 124   // Get a ciInstance representing an unresolved method type constant.
 125   ciInstance* get_unloaded_method_type_constant(ciSymbol* signature);
 126 
 127 
 128   // Get the ciMethodData representing the methodData for a method
 129   // with none.
 130   ciMethodData* get_empty_methodData();
 131 
 132   ciReturnAddress* get_return_address(int bci);
 133 
 134   void print_contents();
 135   void print();
 136 };
 137 
 138 #endif // SHARE_VM_CI_CIOBJECTFACTORY_HPP