object.h

python s60 1.4.5版本的源代码

/* Portions Copyright (c) 2005 Nokia Corporation */
#ifndef Py_OBJECT_H
#define Py_OBJECT_H
#ifdef __cplusplus
extern "C" {
#endif


/* Object and type object interface */

/*
Objects are structures allocated on the heap.  Special rules apply to
the use of objects to ensure they are properly garbage-collected.
Objects are never allocated statically or on the stack; they must be
accessed through special macros and functions only.  (Type objects are
exceptions to the first rule; the standard types are represented by
statically initialized type objects.)

An object has a 'reference count' that is increased or decreased when a
pointer to the object is copied or deleted; when the reference count
reaches zero there are no references to the object left and it can be
removed from the heap.

An object has a 'type' that determines what it represents and what kind
of data it contains.  An object's type is fixed when it is created.
Types themselves are represented as objects; an object contains a
pointer to the corresponding type object.  The type itself has a type
pointer pointing to the object representing the type 'type', which
contains a pointer to itself!).

Objects do not float around in memory; once allocated an object keeps
the same size and address.  Objects that must hold variable-size data
can contain pointers to variable-size parts of the object.  Not all
objects of the same type have the same size; but the size cannot change
after allocation.  (These restrictions are made so a reference to an
object can be simply a pointer -- moving an object would require
updating all the pointers, and changing an object's size would require
moving it if there was another object right next to it.)

Objects are always accessed through pointers of the type 'PyObject *'.
The type 'PyObject' is a structure that only contains the reference count
and the type pointer.  The actual memory allocated for an object
contains other data that can only be accessed after casting the pointer
to a pointer to a longer structure type.  This longer type must start
with the reference count and type fields; the macro PyObject_HEAD should be
used for this (to accommodate for future changes).  The implementation
of a particular object type can cast the object pointer to the proper
type and back.

A standard interface exists for objects that contain an array of items
whose size is determined when the object is allocated.
*/

#ifdef Py_DEBUG

/* Turn on heavy reference debugging */
#define Py_TRACE_REFS

/* Turn on reference counting */
#define Py_REF_DEBUG

#endif /* Py_DEBUG */

#ifdef Py_TRACE_REFS
#define PyObject_HEAD \
	struct _object *_ob_next, *_ob_prev; \
	int ob_refcnt; \
	struct _typeobject *ob_type;
#define PyObject_HEAD_INIT(type) 0, 0, 1, type,
#else /* !Py_TRACE_REFS */
#define PyObject_HEAD \
	int ob_refcnt; \
	struct _typeobject *ob_type;
#define PyObject_HEAD_INIT(type) 1, type,
#endif /* !Py_TRACE_REFS */

#define PyObject_VAR_HEAD \
	PyObject_HEAD \
	int ob_size; /* Number of items in variable part */

typedef struct _object {
	PyObject_HEAD
} PyObject;

typedef struct {
	PyObject_VAR_HEAD
} PyVarObject;


/*
Type objects contain a string containing the type name (to help somewhat
in debugging), the allocation parameters (see newobj() and newvarobj()),
and methods for accessing objects of the type.  Methods are optional,a
nil pointer meaning that particular kind of access is not available for
this type.  The Py_DECREF() macro uses the tp_dealloc method without
checking for a nil pointer; it should always be implemented except if
the implementation can guarantee that the reference count will never
reach zero (e.g., for type objects).

NB: the methods for certain type groups are now contained in separate
method blocks.
*/

typedef PyObject * (*unaryfunc)(PyObject *);
typedef PyObject * (*binaryfunc)(PyObject *, PyObject *);
typedef PyObject * (*ternaryfunc)(PyObject *, PyObject *, PyObject *);
typedef int (*inquiry)(PyObject *);
typedef int (*coercion)(PyObject **, PyObject **);
typedef PyObject *(*intargfunc)(PyObject *, int);
typedef PyObject *(*intintargfunc)(PyObject *, int, int);
typedef int(*intobjargproc)(PyObject *, int, PyObject *);
typedef int(*intintobjargproc)(PyObject *, int, int, PyObject *);
typedef int(*objobjargproc)(PyObject *, PyObject *, PyObject *);
typedef int (*getreadbufferproc)(PyObject *, int, void **);
typedef int (*getwritebufferproc)(PyObject *, int, void **);
typedef int (*getsegcountproc)(PyObject *, int *);
typedef int (*getcharbufferproc)(PyObject *, int, const char **);
typedef int (*objobjproc)(PyObject *, PyObject *);
typedef int (*visitproc)(PyObject *, void *);
typedef int (*traverseproc)(PyObject *, visitproc, void *);

typedef struct {
	/* For numbers without flag bit Py_TPFLAGS_CHECKTYPES set, all
	   arguments are guaranteed to be of the object's type (modulo
	   coercion hacks that is -- i.e. if the type's coercion function
	   returns other types, then these are allowed as well).  Numbers that
	   have the Py_TPFLAGS_CHECKTYPES flag bit set should check *both*
	   arguments for proper type and implement the necessary conversions
	   in the slot functions themselves. */

	binaryfunc nb_add;
	binaryfunc nb_subtract;
	binaryfunc nb_multiply;
	binaryfunc nb_divide;
	binaryfunc nb_remainder;
	binaryfunc nb_divmod;
	ternaryfunc nb_power;
	unaryfunc nb_negative;
	unaryfunc nb_positive;
	unaryfunc nb_absolute;
	inquiry nb_nonzero;
	unaryfunc nb_invert;
	binaryfunc nb_lshift;
	binaryfunc nb_rshift;
	binaryfunc nb_and;
	binaryfunc nb_xor;
	binaryfunc nb_or;
	coercion nb_coerce;
	unaryfunc nb_int;
	unaryfunc nb_long;
	unaryfunc nb_float;
	unaryfunc nb_oct;
	unaryfunc nb_hex;
	/* Added in release 2.0 */
	binaryfunc nb_inplace_add;
	binaryfunc nb_inplace_subtract;
	binaryfunc nb_inplace_multiply;
	binaryfunc nb_inplace_divide;
	binaryfunc nb_inplace_remainder;
	ternaryfunc nb_inplace_power;
	binaryfunc nb_inplace_lshift;
	binaryfunc nb_inplace_rshift;
	binaryfunc nb_inplace_and;
	binaryfunc nb_inplace_xor;
	binaryfunc nb_inplace_or;

	/* Added in release 2.2 */
	/* The following require the Py_TPFLAGS_HAVE_CLASS flag */
	binaryfunc nb_floor_divide;
	binaryfunc nb_true_divide;
	binaryfunc nb_inplace_floor_divide;
	binaryfunc nb_inplace_true_divide;
} PyNumberMethods;

typedef struct {
	inquiry sq_length;
	binaryfunc sq_concat;
	intargfunc sq_repeat;
	intargfunc sq_item;
	intintargfunc sq_slice;
	intobjargproc sq_ass_item;
	intintobjargproc sq_ass_slice;
	objobjproc sq_contains;
	/* Added in release 2.0 */
	binaryfunc sq_inplace_concat;
	intargfunc sq_inplace_repeat;
} PySequenceMethods;

typedef struct {
	inquiry mp_length;
	binaryfunc mp_subscript;
	objobjargproc mp_ass_subscript;
} PyMappingMethods;

typedef struct {
	getreadbufferproc bf_getreadbuffer;
	getwritebufferproc bf_getwritebuffer;
	getsegcountproc bf_getsegcount;
	getcharbufferproc bf_getcharbuffer;
} PyBufferProcs;


typedef void (*destructor)(PyObject *);
typedef int (*printfunc)(PyObject *, FILE *, int);
typedef PyObject *(*getattrfunc)(PyObject *, char *);
typedef PyObject *(*getattrofunc)(PyObject *, PyObject *);
typedef int (*setattrfunc)(PyObject *, char *, PyObject *);
typedef int (*setattrofunc)(PyObject *, PyObject *, PyObject *);
typedef int (*cmpfunc)(PyObject *, PyObject *);
typedef PyObject *(*reprfunc)(PyObject *);
typedef long (*hashfunc)(PyObject *);
typedef PyObject *(*richcmpfunc) (PyObject *, PyObject *, int);
typedef PyObject *(*getiterfunc) (PyObject *);
typedef PyObject *(*iternextfunc) (PyObject *);
typedef PyObject *(*descrgetfunc) (PyObject *, PyObject *, PyObject *);
typedef int (*descrsetfunc) (PyObject *, PyObject *, PyObject *);
typedef int (*initproc)(PyObject *, PyObject *, PyObject *);
typedef PyObject *(*newfunc)(struct _typeobject *, PyObject *, PyObject *);
typedef PyObject *(*allocfunc)(struct _typeobject *, int);

typedef struct _typeobject {
	PyObject_VAR_HEAD
	char *tp_name; /* For printing, in format "<module>.<name>" */
	int tp_basicsize, tp_itemsize; /* For allocation */

	/* Methods to implement standard operations */

	destructor tp_dealloc;
	printfunc tp_print;
	getattrfunc tp_getattr;
	setattrfunc tp_setattr;
	cmpfunc tp_compare;
	reprfunc tp_repr;

	/* Method suites for standard classes */

  // XXX:CW32
	const PyNumberMethods *tp_as_number;
	// XXX:CW32
	const PySequenceMethods *tp_as_sequence;
	// XXX:CW32
	const PyMappingMethods *tp_as_mapping;
  
	/* More standard operations (here for binary compatibility) */

	hashfunc tp_hash;
	ternaryfunc tp_call;
	reprfunc tp_str;
	getattrofunc tp_getattro;
	setattrofunc tp_setattro;

	/* Functions to access object as input/output buffer */
  // XXX:CW32
	const PyBufferProcs *tp_as_buffer;

	/* Flags to define presence of optional/expanded features */
	long tp_flags;

  // XXX:CW32
	const char *tp_doc; /* Documentation string */

	/* Assigned meaning in release 2.0 */
	/* call function for all accessible objects */
	traverseproc tp_traverse;

	/* delete references to contained objects */
	inquiry tp_clear;

	/* Assigned meaning in release 2.1 */
	/* rich comparisons */
	richcmpfunc tp_richcompare;

	/* weak reference enabler */
	long tp_weaklistoffset;

	/* Added in release 2.2 */
	/* Iterators */
	getiterfunc tp_iter;
	iternextfunc tp_iternext;

	/* Attribute descriptor and subclassing stuff */
	// XXX:CW32
	const struct PyMethodDef *tp_methods;
	// XXX:CW32
	const struct PyMemberDef *tp_members;
	// XXX:CW32
	const struct PyGetSetDef *tp_getset;
	struct _typeobject *tp_base;
	PyObject *tp_dict;
	descrgetfunc tp_descr_get;
	descrsetfunc tp_descr_set;
	long tp_dictoffset;
	initproc tp_init;
	allocfunc tp_alloc;
	newfunc tp_new;
	destructor tp_free; /* Low-level free-memory routine */
	inquiry tp_is_gc; /* For PyObject_IS_GC */
	PyObject *tp_bases;
	PyObject *tp_mro; /* method resolution order */
	PyObject *tp_cache;
	PyObject *tp_subclasses;
	PyObject *tp_weaklist;

#ifdef COUNT_ALLOCS
	/* these must be last and never explicitly initialized */
	int tp_allocs;
	int tp_frees;
	int tp_maxalloc;
	struct _typeobject *tp_next;
#endif
} PyTypeObject;


/* Generic type check */
extern DL_IMPORT(int) PyType_IsSubtype(PyTypeObject *, PyTypeObject *);
#define PyObject_TypeCheck(ob, tp) \
	((ob)->ob_type == (tp) || PyType_IsSubtype((ob)->ob_type, (tp)))

  /* extern DL_IMPORT(const PyTypeObject) PyType_Type; *//* built-in 'type' */
  /* extern DL_IMPORT(const PyTypeObject) PyBaseObject_Type; *//* built-in 'object' */
  /* extern DL_IMPORT(const PyTypeObject) PySuper_Type; */ /* built-in 'super' */

#define PyType_Type ((PYTHON_GLOBALS->tobj).t_PyType)
#define PyBaseObject_Type ((PYTHON_GLOBALS->tobj).t_PyBaseObject)
#define PySuper_Type ((PYTHON_GLOBALS->tobj).t_PySuper)


#define PyType_Check(op) PyObject_TypeCheck(op, &PyType_Type)
#define PyType_CheckExact(op) ((op)->ob_type == &PyType_Type)

extern DL_IMPORT(int) PyType_Ready(PyTypeObject *);
extern DL_IMPORT(PyObject *) PyType_GenericAlloc(PyTypeObject *, int);
extern DL_IMPORT(PyObject *) PyType_GenericNew(PyTypeObject *,
					       PyObject *, PyObject *);
extern DL_IMPORT(PyObject *) _PyType_Lookup(PyTypeObject *, PyObject *);

/* Generic operations on objects */
extern DL_IMPORT(int) PyObject_Print(PyObject *, FILE *, int);
extern DL_IMPORT(void) _PyObject_Dump(PyObject *);
extern DL_IMPORT(PyObject *) PyObject_Repr(PyObject *);
extern DL_IMPORT(PyObject *) PyObject_Str(PyObject *);
#ifdef Py_USING_UNICODE
extern DL_IMPORT(PyObject *) PyObject_Unicode(PyObject *);
#endif
extern DL_IMPORT(int) PyObject_Compare(PyObject *, PyObject *);
extern DL_IMPORT(PyObject *) PyObject_RichCompare(PyObject *, PyObject *, int);
extern DL_IMPORT(int) PyObject_RichCompareBool(PyObject *, PyObject *, int);
extern DL_IMPORT(PyObject *) PyObject_GetAttrString(PyObject *, char *);
extern DL_IMPORT(int) PyObject_SetAttrString(PyObject *, char *, PyObject *);
extern DL_IMPORT(int) PyObject_HasAttrString(PyObject *, char *);
extern DL_IMPORT(PyObject *) PyObject_GetAttr(PyObject *, PyObject *);
extern DL_IMPORT(int) PyObject_SetAttr(PyObject *, PyObject *, PyObject *);
extern DL_IMPORT(int) PyObject_HasAttr(PyObject *, PyObject *);
extern DL_IMPORT(PyObject **) _PyObject_GetDictPtr(PyObject *);
extern DL_IMPORT(PyObject *) PyObject_GenericGetAttr(PyObject *, PyObject *);
extern DL_IMPORT(int) PyObject_GenericSetAttr(PyObject *,
					      PyObject *, PyObject *);
extern DL_IMPORT(long) PyObject_Hash(PyObject *);
extern DL_IMPORT(int) PyObject_IsTrue(PyObject *);
extern DL_IMPORT(int) PyObject_Not(PyObject *);
extern DL_IMPORT(int) PyCallable_Check(PyObject *);
extern DL_IMPORT(int) PyNumber_Coerce(PyObject **, PyObject **);
extern DL_IMPORT(int) PyNumber_CoerceEx(PyObject **, PyObject **);

extern DL_IMPORT(void) PyObject_ClearWeakRefs(PyObject *);

/* A slot function whose address we need to compare */
extern int _PyObject_SlotCompare(PyObject *, PyObject *);