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/* Generic object operations; and implementation of None (NoObject) */
#include
"Python.h"
#ifdef
__cplusplus
extern
"C"
{
#endif
#ifdef
Py_REF_DEBUG
Py_ssize_t
_Py_RefTotal
;
Py_ssize_t
_Py_GetRefTotal
(
void
)
{
PyObject
*
o
;
Py_ssize_t
total
=
_Py_RefTotal
;
/* ignore the references to the dummy object of the dicts and sets
because they are not reliable and not useful (now that the
hash table code is well-tested) */
o
=
_PyDict_Dummy
();
if
(
o
!=
NULL
)
total
-=
o
->
ob_refcnt
;
o
=
_PySet_Dummy
();
if
(
o
!=
NULL
)
total
-=
o
->
ob_refcnt
;
return
total
;
}
#endif
/* Py_REF_DEBUG */
int
Py_DivisionWarningFlag
;
int
Py_Py3kWarningFlag
;
/* Object allocation routines used by NEWOBJ and NEWVAROBJ macros.
These are used by the individual routines for object creation.
Do not call them otherwise, they do not initialize the object! */
#ifdef
Py_TRACE_REFS
/* Head of circular doubly-linked list of all objects. These are linked
* together via the _ob_prev and _ob_next members of a PyObject, which
* exist only in a Py_TRACE_REFS build.
*/
static
PyObject
refchain
=
{
&
refchain
,
&
refchain
};
/* Insert op at the front of the list of all objects. If force is true,
* op is added even if _ob_prev and _ob_next are non-NULL already. If
* force is false amd _ob_prev or _ob_next are non-NULL, do nothing.
* force should be true if and only if op points to freshly allocated,
* uninitialized memory, or you've unlinked op from the list and are
* relinking it into the front.
* Note that objects are normally added to the list via _Py_NewReference,
* which is called by PyObject_Init. Not all objects are initialized that
* way, though; exceptions include statically allocated type objects, and
* statically allocated singletons (like Py_True and Py_None).
*/
void
_Py_AddToAllObjects
(
PyObject
*
op
,
int
force
)
{
#ifdef
Py_DEBUG
if
(!
force
) {
/* If it's initialized memory, op must be in or out of
* the list unambiguously.
*/
assert
((
op
->
_ob_prev
==
NULL
)
==
(
op
->
_ob_next
==
NULL
));
}
#endif
if
(
force
||
op
->
_ob_prev
==
NULL
) {
op
->
_ob_next
=
refchain
.
_ob_next
;
op
->
_ob_prev
=
&
refchain
;
refchain
.
_ob_next
->
_ob_prev
=
op
;
refchain
.
_ob_next
=
op
;
}
}
#endif
/* Py_TRACE_REFS */
#ifdef
COUNT_ALLOCS
static
PyTypeObject
*
type_list
;
/* All types are added to type_list, at least when
they get one object created. That makes them
immortal, which unfortunately contributes to
garbage itself. If unlist_types_without_objects
is set, they will be removed from the type_list
once the last object is deallocated. */
static
int
unlist_types_without_objects
;
extern
Py_ssize_t
tuple_zero_allocs
,
fast_tuple_allocs
;
extern
Py_ssize_t
quick_int_allocs
,
quick_neg_int_allocs
;
extern
Py_ssize_t
null_strings
,
one_strings
;
void
dump_counts
(
FILE
*
f
)
{
PyTypeObject
*
tp
;
for
(
tp
=
type_list
;
tp
;
tp
=
tp
->
tp_next
)
fprintf
(
f
,
"%s alloc'd: %"
PY_FORMAT_SIZE_T
"d, "
"freed: %"
PY_FORMAT_SIZE_T
"d, "
"max in use: %"
PY_FORMAT_SIZE_T
"d\n"
,
tp
->
tp_name
,
tp
->
tp_allocs
,
tp
->
tp_frees
,
tp
->
tp_maxalloc
);
fprintf
(
f
,
"fast tuple allocs: %"
PY_FORMAT_SIZE_T
"d, "
"empty: %"
PY_FORMAT_SIZE_T
"d\n"
,
fast_tuple_allocs
,
tuple_zero_allocs
);
fprintf
(
f
,
"fast int allocs: pos: %"
PY_FORMAT_SIZE_T
"d, "
"neg: %"
PY_FORMAT_SIZE_T
"d\n"
,
quick_int_allocs
,
quick_neg_int_allocs
);
fprintf
(
f
,
"null strings: %"
PY_FORMAT_SIZE_T
"d, "
"1-strings: %"
PY_FORMAT_SIZE_T
"d\n"
,
null_strings
,
one_strings
);
}
PyObject
*
get_counts
(
void
)
{
PyTypeObject
*
tp
;
PyObject
*
result
;
PyObject
*
v
;
result
=
PyList_New
(
0
);
if
(
result
==
NULL
)
return
NULL
;
for
(
tp
=
type_list
;
tp
;
tp
=
tp
->
tp_next
) {
v
=
Py_BuildValue
(
"(snnn)"
,
tp
->
tp_name
,
tp
->
tp_allocs
,
tp
->
tp_frees
,
tp
->
tp_maxalloc
);
if
(
v
==
NULL
) {
Py_DECREF
(
result
);
return
NULL
;
}
if
(
PyList_Append
(
result
,
v
)
<
0
) {
Py_DECREF
(
v
);
Py_DECREF
(
result
);
return
NULL
;
}
Py_DECREF
(
v
);
}
return
result
;
}
void
inc_count
(
PyTypeObject
*
tp
)
{
if
(
tp
->
tp_next
==
NULL
&&
tp
->
tp_prev
==
NULL
) {
/* first time; insert in linked list */
if
(
tp
->
tp_next
!=
NULL
)
/* sanity check */
Py_FatalError
(
"XXX inc_count sanity check"
);
if
(
type_list
)
type_list
->
tp_prev
=
tp
;
tp
->
tp_next
=
type_list
;
/* Note that as of Python 2.2, heap-allocated type objects
* can go away, but this code requires that they stay alive
* until program exit. That's why we're careful with
* refcounts here. type_list gets a new reference to tp,
* while ownership of the reference type_list used to hold
* (if any) was transferred to tp->tp_next in the line above.
* tp is thus effectively immortal after this.
*/
Py_INCREF
(
tp
);
type_list
=
tp
;
#ifdef
Py_TRACE_REFS
/* Also insert in the doubly-linked list of all objects,
* if not already there.
*/
_Py_AddToAllObjects
((
PyObject
*
)
tp
,
0
);
#endif
}
tp
->
tp_allocs
++
;
if
(
tp
->
tp_allocs
-
tp
->
tp_frees
>
tp
->
tp_maxalloc
)
tp
->
tp_maxalloc
=
tp
->
tp_allocs
-
tp
->
tp_frees
;
}
void
dec_count
(
PyTypeObject
*
tp
)
{
tp
->
tp_frees
++
;
if
(
unlist_types_without_objects
&&
tp
->
tp_allocs
==
tp
->
tp_frees
) {
/* unlink the type from type_list */
if
(
tp
->
tp_prev
)
tp
->
tp_prev
->
tp_next
=
tp
->
tp_next
;
else
type_list
=
tp
->
tp_next
;
if
(
tp
->
tp_next
)
tp
->
tp_next
->
tp_prev
=
tp
->
tp_prev
;
tp
->
tp_next
=
tp
->
tp_prev
=
NULL
;
Py_DECREF
(
tp
);
}
}
#endif
#ifdef
Py_REF_DEBUG
/* Log a fatal error; doesn't return. */
void
_Py_NegativeRefcount
(
const
char
*
fname
,
int
lineno
,
PyObject
*
op
)
{
char
buf
[
300
];
PyOS_snprintf
(
buf
,
sizeof
(
buf
),
"%s:%i object at %p has negative ref count "
"%"
PY_FORMAT_SIZE_T
"d"
,
fname
,
lineno
,
op
,
op
->
ob_refcnt
);
Py_FatalError
(
buf
);
}
#endif
/* Py_REF_DEBUG */
void
Py_IncRef
(
PyObject
*
o
)
{
Py_XINCREF
(
o
);
}
void
Py_DecRef
(
PyObject
*
o
)
{
Py_XDECREF
(
o
);
}
PyObject
*
PyObject_Init
(
PyObject
*
op
,
PyTypeObject
*
tp
)
{
if
(
op
==
NULL
)
return
PyErr_NoMemory
();
/* Any changes should be reflected in PyObject_INIT (objimpl.h) */
Py_TYPE
(
op
)
=
tp
;
_Py_NewReference
(
op
);
return
op
;
}
PyVarObject
*
PyObject_InitVar
(
PyVarObject
*
op
,
PyTypeObject
*
tp
,
Py_ssize_t
size
)
{
if
(
op
==
NULL
)
return
(
PyVarObject
*
)
PyErr_NoMemory
();
/* Any changes should be reflected in PyObject_INIT_VAR */
op
->
ob_size
=
size
;
Py_TYPE
(
op
)
=
tp
;
_Py_NewReference
((
PyObject
*
)
op
);
return
op
;
}
PyObject
*
_PyObject_New
(
PyTypeObject
*
tp
)
{
PyObject
*
op
;
op
=
(
PyObject
*
)
PyObject_MALLOC
(
_PyObject_SIZE
(
tp
));
if
(
op
==
NULL
)
return
PyErr_NoMemory
();
return
PyObject_INIT
(
op
,
tp
);
}
PyVarObject
*
_PyObject_NewVar
(
PyTypeObject
*
tp
,
Py_ssize_t
nitems
)
{
PyVarObject
*
op
;
const
size_t
size
=
_PyObject_VAR_SIZE
(
tp
,
nitems
);
op
=
(
PyVarObject
*
)
PyObject_MALLOC
(
size
);
if
(
op
==
NULL
)
return
(
PyVarObject
*
)
PyErr_NoMemory
();
return
PyObject_INIT_VAR
(
op
,
tp
,
nitems
);
}
/* for binary compatibility with 2.2 */
#undef
_PyObject_Del
void
_PyObject_Del
(
PyObject
*
op
)
{
PyObject_FREE
(
op
);
}
/* Implementation of PyObject_Print with recursion checking */
static
int
internal_print
(
PyObject
*
op
,
FILE
*
fp
,
int
flags
,
int
nesting
)
{
int
ret
=
0
;
if
(
nesting
>
10
) {
PyErr_SetString
(
PyExc_RuntimeError
,
"print recursion"
);
return
-1
;
}
if
(
PyErr_CheckSignals
())
return
-1
;
#ifdef
USE_STACKCHECK
if
(
PyOS_CheckStack
()) {
PyErr_SetString
(
PyExc_MemoryError
,
"stack overflow"
);
return
-1
;
}
#endif
clearerr
(
fp
);
/* Clear any previous error condition */
if
(
op
==
NULL
) {
Py_BEGIN_ALLOW_THREADS
fprintf
(
fp
, "
<
nil
>
");
Py_END_ALLOW_THREADS
}
else
{
if
(
op
->
ob_refcnt
<=
0
)
/* XXX(twouters) cast refcount to long until %zd is
universally available */
Py_BEGIN_ALLOW_THREADS
fprintf
(
fp
,
"<refcnt %ld at %p>"
,
(
long
)
op
->
ob_refcnt
,
op
);
Py_END_ALLOW_THREADS
else
if
(
Py_TYPE
(
op
)
->
tp_print
==
NULL) {
PyObject
*
s
;
if
(
flags
&
Py_PRINT_RAW
)
s
=
PyObject_Str
(
op
);
else
s
=
PyObject_Repr
(
op
);
if
(
s
==
NULL
)
ret
=
-1
;
else
{
ret
=
internal_print
(
s
,
fp
,
Py_PRINT_RAW
,
nesting
+
1
);
}
Py_XDECREF
(
s
);
}
else
ret
=
(
*
Py_TYPE
(
op
)
->
tp_print
)(
op
,
fp
,
flags
);
}
if
(
ret
==
0
) {
if
(
ferror
(
fp
)) {
PyErr_SetFromErrno
(
PyExc_IOError
);
clearerr
(
fp
);
ret
=
-1
;
}
}
return
ret
;
}
int
PyObject_Print
(
PyObject
*
op
,
FILE
*
fp
,
int
flags
)
{
return
internal_print
(
op
,
fp
,
flags
,
0
);
}
/* For debugging convenience. See Misc/gdbinit for some useful gdb hooks */
void
_PyObject_Dump
(
PyObject
*
op
)
{
if
(
op
==
NULL
)
fprintf
(
stderr
,
"NULL\n"
);
else
{
PyGILState_STATE
gil
;
fprintf
(
stderr
,
"object : "
);
gil
=
PyGILState_Ensure
();
(
void
)
PyObject_Print
(
op
,
stderr
,
0
);
PyGILState_Release
(
gil
);
/* XXX(twouters) cast refcount to long until %zd is
universally available */
fprintf
(
stderr
,
"\n"
"type : %s\n"
"refcount: %ld\n"
"address : %p\n"
,
Py_TYPE
(
op
)
==
NULL
?
"NULL"
:
Py_TYPE
(
op
)
->
tp_name
,
(
long
)
op
->
ob_refcnt
,
op
);
}
}
PyObject
*
PyObject_Repr
(
PyObject
*
v
)
{
if
(
PyErr_CheckSignals
())
return
NULL
;
#ifdef
USE_STACKCHECK
if
(
PyOS_CheckStack
()) {
PyErr_SetString
(
PyExc_MemoryError
,
"stack overflow"
);
return
NULL
;
}
#endif
if
(
v
==
NULL
)
return
PyString_FromString
(
"<NULL>"
);
else
if
(
Py_TYPE
(
v
)
->
tp_repr
==
NULL
)
return
PyString_FromFormat
(
"<%s object at %p>"
,
Py_TYPE
(
v
)
->
tp_name
,
v
);
else
{
PyObject
*
res
;
res
=
(
*
Py_TYPE
(
v
)
->
tp_repr
)(
v
);
if
(
res
==
NULL
)
return
NULL
;
#ifdef
Py_USING_UNICODE
if
(
PyUnicode_Check
(
res
)) {
PyObject
*
str
;
str
=
PyUnicode_AsEncodedString
(
res
,
NULL
,
NULL
);
Py_DECREF
(
res
);
if
(
str
)
res
=
str
;
else
return
NULL
;
}
#endif
if
(!
PyString_Check
(
res
)) {
PyErr_Format
(
PyExc_TypeError
,
"__repr__ returned non-string (type %.200s)"
,
Py_TYPE
(
res
)
->
tp_name
);
Py_DECREF
(
res
);
return
NULL
;
}
return
res
;
}
}
PyObject
*
_PyObject_Str
(
PyObject
*
v
)
{
PyObject
*
res
;
int
type_ok
;
if
(
v
==
NULL
)
return
PyString_FromString
(
"<NULL>"
);
if
(
PyString_CheckExact
(
v
)) {
Py_INCREF
(
v
);
return
v
;
}
#ifdef
Py_USING_UNICODE
if
(
PyUnicode_CheckExact
(
v
)) {
Py_INCREF
(
v
);
return
v
;
}
#endif
if
(
Py_TYPE
(
v
)
->
tp_str
==
NULL
)
return
PyObject_Repr
(
v
);
/* It is possible for a type to have a tp_str representation that loops
infinitely. */
if
(
Py_EnterRecursiveCall
(
" while getting the str of an object"
))
return
NULL
;
res
=
(
*
Py_TYPE
(
v
)
->
tp_str
)(
v
);
Py_LeaveRecursiveCall
();
if
(
res
==
NULL
)
return
NULL
;
type_ok
=
PyString_Check
(
res
);
#ifdef
Py_USING_UNICODE
type_ok
=
type_ok
||
PyUnicode_Check
(
res
);
#endif
if
(!
type_ok
) {
PyErr_Format
(
PyExc_TypeError
,
"__str__ returned non-string (type %.200s)"
,
Py_TYPE
(
res
)
->
tp_name
);
Py_DECREF
(
res
);
return
NULL
;
}
return
res
;
}
PyObject
*
PyObject_Str
(
PyObject
*
v
)
{
PyObject
*
res
=
_PyObject_Str
(
v
);
if
(
res
==
NULL
)
return
NULL
;
#ifdef
Py_USING_UNICODE
if
(
PyUnicode_Check
(
res
)) {
PyObject
*
str
;
str
=
PyUnicode_AsEncodedString
(
res
,
NULL
,
NULL
);
Py_DECREF
(
res
);
if
(
str
)
res
=
str
;
else
return
NULL
;
}
#endif
assert
(
PyString_Check
(
res
));
return
res
;
}
#ifdef
Py_USING_UNICODE
PyObject
*
PyObject_Unicode
(
PyObject
*
v
)
{
PyObject
*
res
;
PyObject
*
func
;
PyObject
*
str
;
int
unicode_method_found
=
0
;
static
PyObject
*
unicodestr
;
if
(
v
==
NULL
) {
res
=
PyString_FromString
(
"<NULL>"
);
if
(
res
==
NULL
)
return
NULL
;
str
=
PyUnicode_FromEncodedObject
(
res
,
NULL
,
"strict"
);
Py_DECREF
(
res
);
return
str
;
}
else
if
(
PyUnicode_CheckExact
(
v
)) {
Py_INCREF
(
v
);
return
v
;
}
/* Try the __unicode__ method */
if
(
unicodestr
==
NULL
) {
unicodestr
=
PyString_InternFromString
(
"__unicode__"
);
if
(
unicodestr
==
NULL
)
return
NULL
;
}
if
(
PyInstance_Check
(
v
)) {
/* We're an instance of a classic class */
/* Try __unicode__ from the instance -- alas we have no type */
func
=
PyObject_GetAttr
(
v
,
unicodestr
);
if
(
func
!=
NULL
) {
unicode_method_found
=
1
;
res
=
PyObject_CallFunctionObjArgs
(
func
,
NULL
);
Py_DECREF
(
func
);
}
else
{
PyErr_Clear
();
}
}
else
{
/* Not a classic class instance, try __unicode__ from type */
/* _PyType_Lookup doesn't create a reference */
func
=
_PyType_Lookup
(
Py_TYPE
(
v
),
unicodestr
);
if
(
func
!=
NULL
) {
unicode_method_found
=
1
;
res
=
PyObject_CallFunctionObjArgs
(
func
,
v
,
NULL
);
}
else
{
PyErr_Clear
();
}
}
/* Didn't find __unicode__ */
if
(!
unicode_method_found
) {
if
(
PyUnicode_Check
(
v
)) {
/* For a Unicode subtype that's didn't overwrite __unicode__,
return a true Unicode object with the same data. */
return
PyUnicode_FromUnicode
(
PyUnicode_AS_UNICODE
(
v
),
PyUnicode_GET_SIZE
(
v
));
}
if
(
PyString_CheckExact
(
v
)) {
Py_INCREF
(
v
);
res
=
v
;
}
else
{
if
(
Py_TYPE
(
v
)
->
tp_str
!=
NULL
)
res
=
(
*
Py_TYPE
(
v
)
->
tp_str
)(
v
);
else
res
=
PyObject_Repr
(
v
);
}
}
if
(
res
==
NULL
)
return
NULL
;
if
(!
PyUnicode_Check
(
res
)) {
str
=
PyUnicode_FromEncodedObject
(
res
,
NULL
,
"strict"
);
Py_DECREF
(
res
);
res
=
str
;
}
return
res
;
}
#endif
/* Helper to warn about deprecated tp_compare return values. Return:
-2 for an exception;
-1 if v < w;
0 if v == w;
1 if v > w.
(This function cannot return 2.)
*/
static
int
adjust_tp_compare
(
int
c
)
{
if
(
PyErr_Occurred
()) {
if
(
c
!=
-1
&&
c
!=
-2
) {
PyObject
*
t
,
*
v
,
*
tb
;
PyErr_Fetch
(
&
t
,
&
v
,
&
tb
);
if
(
PyErr_Warn
(
PyExc_RuntimeWarning
,
"tp_compare didn't return -1 or -2 "
"for exception"
)
<
0
) {
Py_XDECREF
(
t
);
Py_XDECREF
(
v
);
Py_XDECREF
(
tb
);
}
else
PyErr_Restore
(
t
,
v
,
tb
);
}
return
-2
;
}
else
if
(
c
<
-1
||
c
>
1
) {
if
(
PyErr_Warn
(
PyExc_RuntimeWarning
,
"tp_compare didn't return -1, 0 or 1"
)
<
0
)
return
-2
;
else
return
c
<
-1
?
-1
:
1
;
}
else
{
assert
(
c
>=
-1
&&
c
<=
1
);
return
c
;
}
}
/* Macro to get the tp_richcompare field of a type if defined */
#define
RICHCOMPARE
(
t
) (PyType_HasFeature((t), Py_TPFLAGS_HAVE_RICHCOMPARE) \
? (t)->tp_richcompare : NULL)
/* Map rich comparison operators to their swapped version, e.g. LT --> GT */
int
_Py_SwappedOp
[]
=
{
Py_GT
,
Py_GE
,
Py_EQ
,
Py_NE
,
Py_LT
,
Py_LE
};
/* Try a genuine rich comparison, returning an object. Return:
NULL for exception;
NotImplemented if this particular rich comparison is not implemented or
undefined;
some object not equal to NotImplemented if it is implemented
(this latter object may not be a Boolean).
*/
static
PyObject
*
try_rich_compare
(
PyObject
*
v
,
PyObject
*
w
,
int
op
)
{
richcmpfunc
f
;
PyObject
*
res
;
if
(
v
->
ob_type
!=
w
->
ob_type
&&
PyType_IsSubtype
(
w
->
ob_type
,
v
->
ob_type
)
&&
(
f
=
RICHCOMPARE
(
w
->
ob_type
))
!=
NULL
) {
res
=
(
*
f
)(
w
,
v
,
_Py_SwappedOp
[
op
]);
if
(
res
!=
Py_NotImplemented
)
return
res
;
Py_DECREF
(
res
);
}
if
((
f
=
RICHCOMPARE
(
v
->
ob_type
))
!=
NULL
) {
res
=
(
*
f
)(
v
,
w
,
op
);
if
(
res
!=
Py_NotImplemented
)
return
res
;
Py_DECREF
(
res
);
}
if
((
f
=
RICHCOMPARE
(
w
->
ob_type
))
!=
NULL
) {
return
(
*
f
)(
w
,
v
,
_Py_SwappedOp
[
op
]);
}
res
=
Py_NotImplemented
;
Py_INCREF
(
res
);
return
res
;
}
/* Try a genuine rich comparison, returning an int. Return:
-1 for exception (including the case where try_rich_compare() returns an
object that's not a Boolean);
0 if the outcome is false;
1 if the outcome is true;
2 if this particular rich comparison is not implemented or undefined.
*/
static
int
try_rich_compare_bool
(
PyObject
*
v
,
PyObject
*
w
,
int
op
)
{
PyObject
*
res
;
int
ok
;
if
(
RICHCOMPARE
(
v
->
ob_type
)
==
NULL
&&
RICHCOMPARE
(
w
->
ob_type
)
==
NULL
)
return
2
;
/* Shortcut, avoid INCREF+DECREF */
res
=
try_rich_compare
(
v
,
w
,
op
);
if
(
res
==
NULL
)
return
-1
;
if
(
res
==
Py_NotImplemented
) {
Py_DECREF
(
res
);
return
2
;
}
ok
=
PyObject_IsTrue
(
res
);
Py_DECREF
(
res
);
return
ok
;
}
/* Try rich comparisons to determine a 3-way comparison. Return:
-2 for an exception;
-1 if v < w;
0 if v == w;
1 if v > w;
2 if this particular rich comparison is not implemented or undefined.
*/
static
int
try_rich_to_3way_compare
(
PyObject
*
v
,
PyObject
*
w
)
{
static
struct
{
int
op
;
int
outcome
; }
tries
[
3
]
=
{
/* Try this operator, and if it is true, use this outcome: */
{
Py_EQ
,
0
},
{
Py_LT
,
-1
},
{
Py_GT
,
1
},
};
int
i
;
if
(
RICHCOMPARE
(
v
->
ob_type
)
==
NULL
&&
RICHCOMPARE
(
w
->
ob_type
)
==
NULL
)
return
2
;
/* Shortcut */
for
(
i
=
0
;
i
<
3
;
i
++
) {
switch
(
try_rich_compare_bool
(
v
,
w
,
tries
[
i
].
op
)) {
case
-1
:
return
-2
;
case
1
:
return
tries
[
i
].
outcome
;
}
}
return
2
;
}
/* Try a 3-way comparison, returning an int. Return:
-2 for an exception;
-1 if v < w;
0 if v == w;
1 if v > w;
2 if this particular 3-way comparison is not implemented or undefined.
*/
static
int
try_3way_compare
(
PyObject
*
v
,
PyObject
*
w
)
{
int
c
;
cmpfunc
f
;
/* Comparisons involving instances are given to instance_compare,
which has the same return conventions as this function. */
f
=
v
->
ob_type
->
tp_compare
;
if
(
PyInstance_Check
(
v
))
return
(
*
f
)(
v
,
w
);
if
(
PyInstance_Check
(
w
))
return
(
*
w
->
ob_type
->
tp_compare
)(
v
,
w
);
/* If both have the same (non-NULL) tp_compare, use it. */
if
(
f
!=
NULL
&&
f
==
w
->
ob_type
->
tp_compare
) {
c
=
(
*
f
)(
v
,
w
);
return
adjust_tp_compare
(
c
);
}
/* If either tp_compare is _PyObject_SlotCompare, that's safe. */
if
(
f
==
_PyObject_SlotCompare
||
w
->
ob_type
->
tp_compare
==
_PyObject_SlotCompare
)
return
_PyObject_SlotCompare
(
v
,
w
);
/* If we're here, v and w,
a) are not instances;
b) have different types or a type without tp_compare; and
c) don't have a user-defined tp_compare.
tp_compare implementations in C assume that both arguments
have their type, so we give up if the coercion fails or if
it yields types which are still incompatible (which can
happen with a user-defined nb_coerce).
*/
c
=
PyNumber_CoerceEx
(
&
v
,
&
w
);
if
(
c
<
0
)
return
-2
;
if
(
c
>
0
)
return
2
;
f
=
v
->
ob_type
->
tp_compare
;
if
(
f
!=
NULL
&&
f
==
w
->
ob_type
->
tp_compare
) {
c
=
(
*
f
)(
v
,
w
);
Py_DECREF
(
v
);
Py_DECREF
(
w
);
return
adjust_tp_compare
(
c
);
}
/* No comparison defined */
Py_DECREF
(
v
);
Py_DECREF
(
w
);
return
2
;
}
/* Final fallback 3-way comparison, returning an int. Return:
-2 if an error occurred;
-1 if v < w;
0 if v == w;
1 if v > w.
*/
static
int
default_3way_compare
(
PyObject
*
v
,
PyObject
*
w
)
{
int
c
;
const
char
*
vname
,
*
wname
;
if
(
v
->
ob_type
==
w
->
ob_type
) {
/* When comparing these pointers, they must be cast to
* integer types (i.e. Py_uintptr_t, our spelling of C9X's
* uintptr_t). ANSI specifies that pointer compares other
* than == and != to non-related structures are undefined.
*/
Py_uintptr_t
vv
=
(
Py_uintptr_t
)
v
;
Py_uintptr_t
ww
=
(
Py_uintptr_t
)
w
;
return
(
vv
<
ww
) ?
-1
: (
vv
>
ww
) ?
1
:
0
;
}
/* None is smaller than anything */
if
(
v
==
Py_None
)
return
-1
;
if
(
w
==
Py_None
)
return
1
;
/* different type: compare type names; numbers are smaller */
if
(
PyNumber_Check
(
v
))
vname
=
""
;
else
vname
=
v
->
ob_type
->
tp_name
;
if
(
PyNumber_Check
(
w
))
wname
=
""
;
else
wname
=
w
->
ob_type
->
tp_name
;
c
=
strcmp
(
vname
,
wname
);
if
(
c
<
0
)
return
-1
;
if
(
c
>
0
)
return
1
;
/* Same type name, or (more likely) incomparable numeric types */
return
((
Py_uintptr_t
)(
v
->
ob_type
)
<
(
Py_uintptr_t
)(
w
->
ob_type
)) ?
-1
:
1
;
}
/* Do a 3-way comparison, by hook or by crook. Return:
-2 for an exception (but see below);
-1 if v < w;
0 if v == w;
1 if v > w;
BUT: if the object implements a tp_compare function, it returns
whatever this function returns (whether with an exception or not).
*/
static
int
do_cmp
(
PyObject
*
v
,
PyObject
*
w
)
{
int
c
;
cmpfunc
f
;
if
(
v
->
ob_type
==
w
->
ob_type
&&
(
f
=
v
->
ob_type
->
tp_compare
)
!=
NULL
) {
c
=
(
*
f
)(
v
,
w
);
if
(
PyInstance_Check
(
v
)) {
/* Instance tp_compare has a different signature.
But if it returns undefined we fall through. */
if
(
c
!=
2
)
return
c
;
/* Else fall through to try_rich_to_3way_compare() */
}
else
return
adjust_tp_compare
(
c
);
}
/* We only get here if one of the following is true:
a) v and w have different types
b) v and w have the same type, which doesn't have tp_compare
c) v and w are instances, and either __cmp__ is not defined or
__cmp__ returns NotImplemented
*/
c
=
try_rich_to_3way_compare
(
v
,
w
);
if
(
c
<
2
)
return
c
;
c
=
try_3way_compare
(
v
,
w
);
if
(
c
<
2
)
return
c
;
return
default_3way_compare
(
v
,
w
);
}
/* Compare v to w. Return
-1 if v < w or exception (PyErr_Occurred() true in latter case).
0 if v == w.
1 if v > w.
XXX The docs (C API manual) say the return value is undefined in case
XXX of error.
*/
int
PyObject_Compare
(
PyObject
*
v
,
PyObject
*
w
)
{
int
result
;
if
(
v
==
NULL
||
w
==
NULL
) {
PyErr_BadInternalCall
();
return
-1
;
}
if
(
v
==
w
)
return
0
;
if
(
Py_EnterRecursiveCall
(
" in cmp"
))
return
-1
;
result
=
do_cmp
(
v
,
w
);
Py_LeaveRecursiveCall
();
return
result
<
0
?
-1
:
result
;
}
/* Return (new reference to) Py_True or Py_False. */
static
PyObject
*
convert_3way_to_object
(
int
op
,
int
c
)
{
PyObject
*
result
;
switch
(
op
) {
case
Py_LT
:
c
=
c
<
0
;
break
;
case
Py_LE
:
c
=
c
<=
0
;
break
;
case
Py_EQ
:
c
=
c
==
0
;
break
;
case
Py_NE
:
c
=
c
!=
0
;
break
;
case
Py_GT
:
c
=
c
>
0
;
break
;
case
Py_GE
:
c
=
c
>=
0
;
break
;
}
result
=
c
?
Py_True
:
Py_False
;
Py_INCREF
(
result
);
return
result
;
}
/* We want a rich comparison but don't have one. Try a 3-way cmp instead.
Return
NULL if error
Py_True if v op w
Py_False if not (v op w)
*/
static
PyObject
*
try_3way_to_rich_compare
(
PyObject
*
v
,
PyObject
*
w
,
int
op
)
{
int
c
;
c
=
try_3way_compare
(
v
,
w
);
if
(
c
>=
2
) {
/* Py3K warning if types are not equal and comparison isn't == or != */
if
(
Py_Py3kWarningFlag
&&
v
->
ob_type
!=
w
->
ob_type
&&
op
!=
Py_EQ
&&
op
!=
Py_NE
&&
PyErr_WarnEx
(
PyExc_DeprecationWarning
,
"comparing unequal types not supported "
"in 3.x"
,
1
)
<
0
) {
return
NULL
;
}
c
=
default_3way_compare
(
v
,
w
);
}
if
(
c
<=
-2
)
return
NULL
;
return
convert_3way_to_object
(
op
,
c
);
}
/* Do rich comparison on v and w. Return
NULL if error
Else a new reference to an object other than Py_NotImplemented, usually(?):
Py_True if v op w
Py_False if not (v op w)
*/
static
PyObject
*
do_richcmp
(
PyObject
*
v
,
PyObject
*
w
,
int
op
)
{
PyObject
*
res
;
res
=
try_rich_compare
(
v
,
w
,
op
);
if
(
res
!=
Py_NotImplemented
)
return
res
;
Py_DECREF
(
res
);
return
try_3way_to_rich_compare
(
v
,
w
,
op
);
}
/* Return:
NULL for exception;
some object not equal to NotImplemented if it is implemented
(this latter object may not be a Boolean).
*/
PyObject
*
PyObject_RichCompare
(
PyObject
*
v
,
PyObject
*
w
,
int
op
)
{
PyObject
*
res
;
assert
(
Py_LT
<=
op
&&
op
<=
Py_GE
);
if
(
Py_EnterRecursiveCall
(
" in cmp"
))
return
NULL
;
/* If the types are equal, and not old-style instances, try to
get out cheap (don't bother with coercions etc.). */
if
(
v
->
ob_type
==
w
->
ob_type
&&
!
PyInstance_Check
(
v
)) {
cmpfunc
fcmp
;
richcmpfunc
frich
=
RICHCOMPARE
(
v
->
ob_type
);
/* If the type has richcmp, try it first. try_rich_compare
tries it two-sided, which is not needed since we've a
single type only. */
if
(
frich
!=
NULL
) {
res
=
(
*
frich
)(
v
,
w
,
op
);
if
(
res
!=
Py_NotImplemented
)
goto
Done
;
Py_DECREF
(
res
);
}
/* No richcmp, or this particular richmp not implemented.
Try 3-way cmp. */
fcmp
=
v
->
ob_type
->
tp_compare
;
if
(
fcmp
!=
NULL
) {
int
c
=
(
*
fcmp
)(
v
,
w
);
c
=
adjust_tp_compare
(
c
);
if
(
c
==
-2
) {
res
=
NULL
;
goto
Done
;
}
res
=
convert_3way_to_object
(
op
,
c
);
goto
Done
;
}
}
/* Fast path not taken, or couldn't deliver a useful result. */
res
=
do_richcmp
(
v
,
w
,
op
);
Done
:
Py_LeaveRecursiveCall
();
return
res
;
}
/* Return -1 if error; 1 if v op w; 0 if not (v op w). */
int
PyObject_RichCompareBool
(
PyObject
*
v
,
PyObject
*
w
,
int
op
)
{
PyObject
*
res
;
int
ok
;
/* Quick result when objects are the same.
Guarantees that identity implies equality. */
if
(
v
==
w
) {
if
(
op
==
Py_EQ
)
return
1
;
else
if
(
op
==
Py_NE
)
return
0
;
}
res
=
PyObject_RichCompare
(
v
,
w
,
op
);
if
(
res
==
NULL
)
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