diff options
Diffstat (limited to 'Include')
| -rw-r--r-- | Include/objimpl.h | 61 |
1 files changed, 58 insertions, 3 deletions
diff --git a/Include/objimpl.h b/Include/objimpl.h index 860030f..003dfdf 100644 --- a/Include/objimpl.h +++ b/Include/objimpl.h @@ -203,7 +203,6 @@ extern DL_IMPORT(void) _PyObject_Del Py_PROTO((PyObject *)); ( (type *) PyObject_InitVar( \ (PyVarObject *) PyObject_MALLOC( _PyObject_VAR_SIZE((typeobj),(n)) ),\ (typeobj), (n)) ) -#define PyObject_DEL(op) PyObject_FREE(op) /* This example code implements an object constructor with a custom allocator, where PyObject_New is inlined, and shows the important @@ -234,11 +233,67 @@ extern DL_IMPORT(void) _PyObject_Del Py_PROTO((PyObject *)); the 1st step is performed automatically for you, so in a C++ class constructor you would start directly with PyObject_Init/InitVar. */ +/* + * Garbage Collection Support + * ========================== + */ +/* To make a new object participate in garbage collection use + PyObject_{New, VarNew, Del} to manage the memory. Set the type flag + Py_TPFLAGS_GC and define the type method tp_recurse. You should also + add the method tp_clear if your object is mutable. Include + PyGC_INFO_SIZE in the calculation of tp_basicsize. Call + PyObject_GC_Init after the pointers followed by tp_recurse become + valid (usually just before returning the object from the allocation + method. Call PyObject_GC_Fini before those pointers become invalid + (usually at the top of the deallocation method). */ #ifndef WITH_CYCLE_GC -#define PyGC_INFO_SIZE 0 -#endif + +#define PyGC_HEAD_SIZE 0 +#define PyObject_GC_Init(op) +#define PyObject_GC_Fini(op) +#define PyObject_AS_GC(op) (op) +#define PyObject_FROM_GC(op) (op) +#define PyObject_DEL(op) PyObject_FREE(op) + +#else + +/* Add the object into the container set */ +extern DL_IMPORT(void) _PyGC_Insert Py_PROTO((PyObject *)); + +/* Remove the object from the container set */ +extern DL_IMPORT(void) _PyGC_Remove Py_PROTO((PyObject *)); + +#define PyObject_GC_Init(op) _PyGC_Insert((PyObject *)op) +#define PyObject_GC_Fini(op) _PyGC_Remove((PyObject *)op) + +/* Structure *prefixed* to container objects participating in GC */ +typedef struct _gc_head { + struct _gc_head *gc_next; + struct _gc_head *gc_prev; + int gc_refs; +} PyGC_Head; + +#define PyGC_HEAD_SIZE sizeof(PyGC_Head) + +/* Test if a type has a GC head */ +#define PyType_IS_GC(t) PyType_HasFeature((t), Py_TPFLAGS_GC) + +/* Test if an object has a GC head */ +#define PyObject_IS_GC(o) PyType_IS_GC((o)->ob_type) + +/* Get an object's GC head */ +#define PyObject_AS_GC(o) ((PyGC_Head *)(o)-1) + +/* Get the object given the PyGC_Head */ +#define PyObject_FROM_GC(g) ((PyObject *)(((PyGC_Head *)g)+1)) + +#define PyObject_DEL(op) PyObject_FREE( PyObject_IS_GC(op) ? \ + (ANY *)PyObject_AS_GC(op) : \ + (ANY *)(op) ) + +#endif /* WITH_CYCLE_GC */ #ifdef __cplusplus } |