associationOop.hpp

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/* Copyright 1994, 1995 LongView Technologies L.L.C. $Revision: 1.11 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
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// Associations are cons cells (key, value) used in the Delta system dictionary.
//  - associationOops      are mutable.
//  - constAssociationOops are immutable.

// memory layout:
//  [header      ]
//  [klass_field ]
//  [key         ]
//  [value       ]
//  [is_constant ]

class associationOopDesc: public memOopDesc {
 protected:
  symbolOop _key;
  oop       _value;
  oop       _is_constant;
 public:
  associationOopDesc* addr() const {
    return (associationOopDesc*) memOopDesc::addr(); }

  friend associationOop as_associationOop(void* p) {
    return associationOop(as_memOop(p)); }

  // sizing
  static int header_size()      { return sizeof(associationOopDesc)/oopSize; }

  void bootstrap_object(bootstrap* st);

  symbolOop key() const         { return addr()->_key; }
  void set_key(symbolOop k)     { STORE_OOP(&addr()->_key,k);}

  oop value() const             { return addr()->_value; }
  void set_value(oop v)         { STORE_OOP(&addr()->_value, v); }

  bool is_constant() const      { return addr()->_is_constant == trueObj; }
  void set_is_constant(bool v);

  static int key_offset()         { return 2; } // offset of the key field in words
  static int value_offset()       { return 3; } // offset of the value field in words
  static int is_constant_offset() { return 4; } // offset of the is_constant field in words
  friend associationKlass;
};

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