lib/base/object.h

   1 #ifndef __base_object_h
   2 #define __base_object_h
   3
   4 #include <assert.h>
   5 #include <lib/base/smartptr.h>
   6 #include <lib/base/elock.h>
   7
   8 //#define OBJECT_DEBUG
   9
  10 #ifdef OBJECT_DEBUG
  11         #include <lib/base/eerror.h>
  12 #endif
  13
  14 typedef int RESULT;
  15
  16 class iObject
  17 {
  18 private:
  19                 /* we don't allow the default operator here, as it would break the refcount. */
  20         void operator=(const iObject &);
  21 protected:
  22         virtual ~iObject() { }
  23 public:
  24         virtual void AddRef()=0;
  25         virtual void Release()=0;
  26 };
  27
  28 #ifndef SWIG
  29         struct oRefCount
  30         {
  31                 volatile int count;
  32                 oRefCount(): count(0) { }
  33                 operator volatile int&() { return count; }
  34                 ~oRefCount() {
  35         #ifdef OBJECT_DEBUG
  36                         if (count) eDebug("OBJECT_DEBUG FATAL: %p has %d references!", this, count); else eDebug("OBJECT_DEBUG refcount ok! (%p)", this);
  37         #endif
  38                 }
  39         };
  40
  41         #if defined(OBJECT_DEBUG)
  42                 extern int object_total_remaining;
  43                 #define DECLARE_REF(x)                  \
  44                         private:oRefCount ref;  \
  45                                         eSingleLock ref_lock; \
  46                         public: void AddRef();          \
  47                                         void Release();
  48                 #define DEFINE_REF(c) \
  49                         void c::AddRef() \
  50                         { \
  51                                 eSingleLocker l(ref_lock); \
  52                                 ++object_total_remaining; \
  53                                 ++ref; \
  54                                 eDebug("OBJECT_DEBUG " #c "+%p now %d", this, (int)ref); \
  55                         } \
  56                         void c::Release() \
  57                         { \
  58                                 { \
  59                                         eSingleLocker l(ref_lock); \
  60                                         --object_total_remaining; \
  61                                         --ref; \
  62                                         eDebug("OBJECT_DEBUG " #c "-%p now %d", this, (int)ref); \
  63                                 } \
  64                                 if (!ref) \
  65                                         delete this; \
  66                         }
  67         #elif defined(__mips__)
  68                 #define DECLARE_REF(x)                  \
  69                         private: oRefCount ref;         \
  70                         public: void AddRef();          \
  71                                         void Release();
  72                 #define DEFINE_REF(c) \
  73                         void c::AddRef() \
  74                         { \
  75                                 unsigned long temp; \
  76                                 __asm__ __volatile__( \
  77                                 "               .set    mips3                                                                                   \n" \
  78                                 "1:             ll              %0, %1  # load counter                                                  \n" \
  79                                 "               .set    mips0                                                                                   \n" \
  80                                 "               addu    %0, 1   # increment                                                             \n" \
  81                                 "               .set    mips3                                                                                   \n" \
  82                                 "               sc              %0, %1  # try to store, checking for atomicity  \n" \
  83                                 "               .set    mips0                                                                                   \n" \
  84                                 "               beqz    %0, 1b  # if not atomic (0), try again                  \n" \
  85                                 : "=&r" (temp), "=m" (ref.count) \
  86                                 : "m" (ref.count) \
  87                                 : ); \
  88                         } \
  89                         void c::Release() \
  90                         { \
  91                                 unsigned long temp; \
  92                                 __asm__ __volatile__( \
  93                                 "               .set    mips3                           \n" \
  94                                 "1:             ll              %0, %1                          \n" \
  95                                 "               .set    mips0                           \n" \
  96                                 "               subu    %0, 1   # decrement     \n" \
  97                                 "               .set    mips3                           \n" \
  98                                 "               sc              %0, %1                          \n" \
  99                                 "               .set    mips0                           \n" \
 100                                 "               beqz    %0, 1b                          \n" \
 101                                 : "=&r" (temp), "=m" (ref.count) \
 102                                 : "m" (ref.count) \
 103                                 : ); \
 104                                 if (!ref) \
 105                                         delete this; \
 106                         }
 107         #elif defined(__ppc__)
 108                 #define DECLARE_REF(x)                  \
 109                         private: oRefCount ref;         \
 110                         public: void AddRef();          \
 111                                         void Release();
 112                 #define DEFINE_REF(c) \
 113                         void c::AddRef() \
 114                         { \
 115                                 int temp; \
 116                                 __asm__ __volatile__( \
 117                                 "1:             lwarx   %0, 0, %3       \n" \
 118                                 "               add             %0, %2, %0      \n" \
 119                                 "               dcbt    0, %3           # workaround for PPC405CR Errata\n" \
 120                                 "               stwcx.  %0, 0, %3       \n" \
 121                                 "               bne-    1b                      \n" \
 122                                 : "=&r" (temp), "=m" (ref.count) \
 123                                 : "r" (1), "r" (&ref.count), "m" (ref.count) \
 124                                 : "cc"); \
 125                         } \
 126                         void c::Release() \
 127                         { \
 128                                 int temp; \
 129                                 __asm__ __volatile__( \
 130                                 "1:             lwarx   %0, 0, %3       \n" \
 131                                 "               subf    %0, %2, %0      \n" \
 132                                 "               dcbt    0, %3           # workaround for PPC405CR Errata\n" \
 133                                 "               stwcx.  %0, 0, %3       \n" \
 134                                 "               bne-    1b                      \n" \
 135                                 : "=&r" (temp), "=m" (ref.count) \
 136                                 : "r" (1), "r" (&ref.count), "m" (ref.count) \
 137                                 : "cc"); \
 138                                 if (!ref) \
 139                                         delete this; \
 140                         }
 141         #else
 142                 #define DECLARE_REF(x)                  \
 143                         private:oRefCount ref;  \
 144                                         eSingleLock ref_lock; \
 145                         public: void AddRef();          \
 146                                         void Release();
 147                 #define DEFINE_REF(c) \
 148                         void c::AddRef() \
 149                         { \
 150                                 eSingleLocker l(ref_lock); \
 151                                 ++ref; \
 152                         } \
 153                         void c::Release() \
 154                         { \
 155                                 { \
 156                                         eSingleLocker l(ref_lock); \
 157                                         --ref; \
 158                                 } \
 159                                 if (!ref) \
 160                                         delete this; \
 161                         }
 162         #endif
 163 #else  // SWIG
 164         #define DECLARE_REF(x) \
 165                 private: \
 166                         void AddRef(); \
 167                         void Release();
 168         class Object
 169         {
 170         };
 171 #endif  // SWIG
 172
 173 #endif  // __base_object_h