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 #include <lib/base/eerror.h>
  11
  12 typedef int RESULT;
  13
  14 class iObject
  15 {
  16 private:
  17                 /* we don't allow the default operator here, as it would break the refcount. */
  18         void operator=(const iObject &);
  19 protected:
  20         virtual ~iObject() { }
  21 #ifdef SWIG
  22         virtual void AddRef()=0;
  23         virtual void Release()=0;
  24 #endif
  25 public:
  26 #ifndef SWIG
  27         virtual void AddRef()=0;
  28         virtual void Release()=0;
  29 #endif
  30 };
  31
  32 #ifndef SWIG
  33         struct oRefCount
  34         {
  35                 volatile int count;
  36                 oRefCount(): count(0) { }
  37                 operator volatile int&() { return count; }
  38                 ~oRefCount()
  39                 {
  40         #ifdef OBJECT_DEBUG
  41                         if (count)
  42                                 eDebug("OBJECT_DEBUG FATAL: %p has %d references!", this, count);
  43                         else
  44                                 eDebug("OBJECT_DEBUG refcount ok! (%p)", this);
  45         #endif
  46                 }
  47         };
  48
  49         #if defined(OBJECT_DEBUG)
  50                 extern int object_total_remaining;
  51                 #define DECLARE_REF(x)                  \
  52                         public: void AddRef();          \
  53                                         void Release();         \
  54                         private:oRefCount ref;          \
  55                                         eSingleLock ref_lock;
  56                 #define DEFINE_REF(c) \
  57                         void c::AddRef() \
  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                         void c::Release() \
  65                         { \
  66                                 { \
  67                                         eSingleLocker l(ref_lock); \
  68                                         --object_total_remaining; \
  69                                         --ref; \
  70                                         eDebug("OBJECT_DEBUG " #c "-%p now %d", this, (int)ref); \
  71                                 } \
  72                                 if (!ref) \
  73                                         delete this; \
  74                         }
  75         #elif defined(__mips__)
  76                 #define DECLARE_REF(x)                  \
  77                         public: void AddRef();          \
  78                                         void Release();         \
  79                         private: oRefCount ref;
  80                 #define DEFINE_REF(c) \
  81                         void c::AddRef() \
  82                         { \
  83                                 unsigned long temp; \
  84                                 __asm__ __volatile__( \
  85                                 "               .set    mips3                                                                                   \n" \
  86                                 "1:             ll              %0, %1  # load counter                                                  \n" \
  87                                 "               .set    mips0                                                                                   \n" \
  88                                 "               addu    %0, 1   # increment                                                             \n" \
  89                                 "               .set    mips3                                                                                   \n" \
  90                                 "               sc              %0, %1  # try to store, checking for atomicity  \n" \
  91                                 "               .set    mips0                                                                                   \n" \
  92                                 "               beqz    %0, 1b  # if not atomic (0), try again                  \n" \
  93                                 : "=&r" (temp), "=m" (ref.count) \
  94                                 : "m" (ref.count) \
  95                                 : ); \
  96                         } \
  97                         void c::Release() \
  98                         { \
  99                                 unsigned long temp; \
 100                                 __asm__ __volatile__( \
 101                                 "               .set    mips3                           \n" \
 102                                 "1:             ll              %0, %1                          \n" \
 103                                 "               .set    mips0                           \n" \
 104                                 "               subu    %0, 1   # decrement     \n" \
 105                                 "               .set    mips3                           \n" \
 106                                 "               sc              %0, %1                          \n" \
 107                                 "               .set    mips0                           \n" \
 108                                 "               beqz    %0, 1b                          \n" \
 109                                 : "=&r" (temp), "=m" (ref.count) \
 110                                 : "m" (ref.count) \
 111                                 : ); \
 112                                 if (!ref) \
 113                                         delete this; \
 114                         }
 115         #elif defined(__ppc__) || defined(__powerpc__)
 116                 #define DECLARE_REF(x)                  \
 117                         public: void AddRef();          \
 118                                         void Release();         \
 119                         private: oRefCount ref;
 120                 #define DEFINE_REF(c) \
 121                         void c::AddRef() \
 122                         { \
 123                                 int temp; \
 124                                 __asm__ __volatile__( \
 125                                 "1:             lwarx   %0, 0, %3       \n" \
 126                                 "               add             %0, %2, %0      \n" \
 127                                 "               dcbt    0, %3           # workaround for PPC405CR Errata\n" \
 128                                 "               stwcx.  %0, 0, %3       \n" \
 129                                 "               bne-    1b                      \n" \
 130                                 : "=&r" (temp), "=m" (ref.count) \
 131                                 : "r" (1), "r" (&ref.count), "m" (ref.count) \
 132                                 : "cc"); \
 133                         } \
 134                         void c::Release() \
 135                         { \
 136                                 int temp; \
 137                                 __asm__ __volatile__( \
 138                                 "1:             lwarx   %0, 0, %3       \n" \
 139                                 "               subf    %0, %2, %0      \n" \
 140                                 "               dcbt    0, %3           # workaround for PPC405CR Errata\n" \
 141                                 "               stwcx.  %0, 0, %3       \n" \
 142                                 "               bne-    1b                      \n" \
 143                                 : "=&r" (temp), "=m" (ref.count) \
 144                                 : "r" (1), "r" (&ref.count), "m" (ref.count) \
 145                                 : "cc"); \
 146                                 if (!ref) \
 147                                         delete this; \
 148                         }
 149         #elif defined(__i386__) || defined(__x86_64__)
 150                 #define DECLARE_REF(x)                  \
 151                         public: void AddRef();          \
 152                                         void Release();         \
 153                         private: oRefCount ref;
 154                 #define DEFINE_REF(c) \
 155                         void c::AddRef() \
 156                         { \
 157                                 __asm__ __volatile__( \
 158                                 "               lock ; incl     %0      \n" \
 159                                 : "=m" (ref.count) \
 160                                 : "m" (ref.count)); \
 161                         } \
 162                         void c::Release() \
 163                         { \
 164                                 __asm__ __volatile__( \
 165                                 "               lock ; decl     %0      \n" \
 166                                 : "=m" (ref.count) \
 167                                 : "m" (ref.count)); \
 168                                 if (!ref) \
 169                                         delete this; \
 170                         }
 171         #else
 172                 #warning use non optimized implementation of refcounting.
 173                 #define DECLARE_REF(x)                  \
 174                         public: void AddRef();          \
 175                                         void Release();         \
 176                         private:oRefCount ref;  \
 177                                         eSingleLock ref_lock;
 178                 #define DEFINE_REF(c) \
 179                         void c::AddRef() \
 180                         { \
 181                                 eSingleLocker l(ref_lock); \
 182                                 ++ref; \
 183                         } \
 184                         void c::Release() \
 185                         { \
 186                                 { \
 187                                         eSingleLocker l(ref_lock); \
 188                                         --ref; \
 189                                 } \
 190                                 if (!ref) \
 191                                         delete this; \
 192                         }
 193         #endif
 194 #else  // SWIG
 195         #define DECLARE_REF(x) \
 196                 private: \
 197                         void AddRef(); \
 198                         void Release();
 199 #endif  // SWIG
 200
 201 #endif  // __base_object_h