1 /* Copyright (c) 2009 The Khronos Group Inc.

     2  *

     3  * Permission is hereby granted, free of charge, to any person obtaining a

     4  * copy of this software and/or associated documentation files (the

     5  * "Materials"), to deal in the Materials without restriction, including

     6  * without limitation the rights to use, copy, modify, merge, publish,

     7  * distribute, sublicense, and/or sell copies of the Materials, and to

     8  * permit persons to whom the Materials are furnished to do so, subject to

     9  * the following conditions:

    10  *

    11  * The above copyright notice and this permission notice shall be included

    12  * in all copies or substantial portions of the Materials.

    13  *

    14  * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

    15  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

    16  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

    17  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

    18  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

    19  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

    20  * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.

    21  */

    22 

    23 #ifndef OWFOBJECT_H_

    24 #define OWFOBJECT_H_

    25 

    26 #include <stdlib.h>

    27 

    28 #include "owftypes.h"

    29 #include "owfdebug.h"

    30 

    31 

    32 #ifdef __cplusplus

    33 extern "C"

    34 {

    35 #endif

    36 

    37 

    38 typedef void (*DESTRUCTOR)(void*);

    39 typedef void (*CONSTRUCTOR)(void*);

    40 

    41 typedef struct {

    42     const char*             type;

    43     DESTRUCTOR              destructor;

    44     OWFuint32               referenceCount;

    45     void*                   payload;

    46 } OWF_OBJECT;

    47 

    48 #define TYPE(x)             "" # x "_type"

    49 

    50 /*! returns field offset within structure */

    51 #define FOFF(x,y)           ((OWFuint32) &(((x*) 0x1000)->y) - 0x1000)

    52 

    53 /*! returns pointer to wrapper object which holds object x */

    54 #define _O(x)               ((OWF_OBJECT*) ((OWFuint32)(x) -\

    55                                            FOFF(OWF_OBJECT,payload)))

    56 

    57 /*! create new object instance */

    58 #define CREATE(x)           (x*) OWF_Object_Construct(sizeof(x), TYPE(x), \

    59                                                       & x##_Ctor, & x##_Dtor)

    60 

    61 #define REFCOUNT(x)         ((x) ? _O(x)->referenceCount : 0xFFFFFFFF)

    62 

    63 /*! get the type of the contained object  */

    64 #define TYPEOF(x)           (_O(x)->type)

    65 

    66 /*! increment object reference count  */

    67 #define ADDREF(x,y) \

    68     if (y) {\

    69          _O(y)->referenceCount++; \

    70          DPRINT(("ADDREF: ref count of %s(%p) is now %d\n", TYPEOF(y), y, \

    71                  REFCOUNT(y)));\

    72     }\

    73     x = y;

    74 

    75 /*! decrement object reference count, call destructor if count reaches zero  */

    76 #define REMREF(x) \

    77     if (x) {\

    78         --_O(x)->referenceCount; \

    79         DPRINT(("REMREF: ref count of %s(%p) is now %d\n", TYPEOF(x), x, \

    80                 REFCOUNT(x))); \

    81         if (0 == _O(x)->referenceCount) {\

    82             if (_O(x)->destructor) {\

    83                 _O(x)->destructor(x);\

    84             }\

    85             xfree(_O(x));\

    86         }\

    87         x = NULL;\

    88     }

    89 

    90 #define DESTROY(x) \

    91     REMREF(x); \

    92     x = NULL;

    93 

    94 OWF_API_CALL void*

    95 OWF_Object_Construct(size_t size,

    96                      const char* type,

    97                      CONSTRUCTOR ctor,

    98                      DESTRUCTOR dtor);

    99 

   100 

   101 #ifdef __cplusplus

   102 }

   103 #endif

   104 

   105 

   106 #endif /* OWFOBJECT_H_ */