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final patches from Neil Schemenauer for garbage collection

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This commit is contained in:
Jeremy Hylton 2000-06-30 05:02:53 +00:00
parent 4e542a3d99
commit c5007aa5c3
16 changed files with 956 additions and 18 deletions
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61
Include/objimpl.h
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@ -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
}