1 /*
   2  * Copyright (c) 1997, 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_OOPS_KLASSOOP_HPP
  26 #define SHARE_VM_OOPS_KLASSOOP_HPP
  27 
  28 #include "oops/oop.hpp"
  29 
  30 // A klassOop is the C++ equivalent of a Java class.
  31 // Part of a klassOopDesc is a Klass which handle the
  32 // dispatching for the C++ method calls.
  33 
  34 //  klassOop object layout:
  35 //    [header     ]
  36 //    [klass_field]
  37 //    [KLASS      ]
  38 
  39 class klassOopDesc : public oopDesc {
  40  public:
  41   // size operation
  42   static int header_size()                       { return sizeof(klassOopDesc)/HeapWordSize; }
  43 
  44   // support for code generation
  45   static int klass_part_offset_in_bytes()        { return sizeof(klassOopDesc); }
  46 
  47   // returns the Klass part containing dispatching behavior
  48   Klass* klass_part() const                      { return (Klass*)((address)this + klass_part_offset_in_bytes()); }
  49 
  50   // Convenience wrapper
  51   inline oop java_mirror() const;
  52 
  53  private:
  54   // These have no implementation since klassOop should never be accessed in this fashion
  55   oop obj_field(int offset) const;
  56   void obj_field_put(int offset, oop value);
  57   void obj_field_raw_put(int offset, oop value);
  58 
  59   jbyte byte_field(int offset) const;
  60   void byte_field_put(int offset, jbyte contents);
  61 
  62   jchar char_field(int offset) const;
  63   void char_field_put(int offset, jchar contents);
  64 
  65   jboolean bool_field(int offset) const;
  66   void bool_field_put(int offset, jboolean contents);
  67 
  68   jint int_field(int offset) const;
  69   void int_field_put(int offset, jint contents);
  70 
  71   jshort short_field(int offset) const;
  72   void short_field_put(int offset, jshort contents);
  73 
  74   jlong long_field(int offset) const;
  75   void long_field_put(int offset, jlong contents);
  76 
  77   jfloat float_field(int offset) const;
  78   void float_field_put(int offset, jfloat contents);
  79 
  80   jdouble double_field(int offset) const;
  81   void double_field_put(int offset, jdouble contents);
  82 
  83   address address_field(int offset) const;
  84   void address_field_put(int offset, address contents);
  85 
  86   oop obj_field_acquire(int offset) const;
  87   void release_obj_field_put(int offset, oop value);
  88 
  89   jbyte byte_field_acquire(int offset) const;
  90   void release_byte_field_put(int offset, jbyte contents);
  91 
  92   jchar char_field_acquire(int offset) const;
  93   void release_char_field_put(int offset, jchar contents);
  94 
  95   jboolean bool_field_acquire(int offset) const;
  96   void release_bool_field_put(int offset, jboolean contents);
  97 
  98   jint int_field_acquire(int offset) const;
  99   void release_int_field_put(int offset, jint contents);
 100 
 101   jshort short_field_acquire(int offset) const;
 102   void release_short_field_put(int offset, jshort contents);
 103 
 104   jlong long_field_acquire(int offset) const;
 105   void release_long_field_put(int offset, jlong contents);
 106 
 107   jfloat float_field_acquire(int offset) const;
 108   void release_float_field_put(int offset, jfloat contents);
 109 
 110   jdouble double_field_acquire(int offset) const;
 111   void release_double_field_put(int offset, jdouble contents);
 112 
 113   address address_field_acquire(int offset) const;
 114   void release_address_field_put(int offset, address contents);
 115 };
 116 
 117 #endif // SHARE_VM_OOPS_KLASSOOP_HPP