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Copy pathtupleobject.c
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1282 lines (1135 loc) · 36.2 KB
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/* Tuple object implementation */
#include "Python.h"
#include "pycore_abstract.h" // _PyIndex_Check()
#include "pycore_ceval.h" // _PyEval_GetBuiltin()
#include "pycore_freelist.h" // _Py_FREELIST_PUSH()
#include "pycore_gc.h" // _PyObject_GC_IS_TRACKED()
#include "pycore_list.h" // _Py_memory_repeat()
#include "pycore_modsupport.h" // _PyArg_NoKwnames()
#include "pycore_object.h" // _PyObject_GC_TRACK()
#include "pycore_stackref.h" // PyStackRef_AsPyObjectSteal()
#include "pycore_tuple.h" // _PyTupleIterObject
/*[clinic input]
class tuple "PyTupleObject *" "&PyTuple_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=f051ba3cfdf9a189]*/
#include "clinic/tupleobject.c.h"
static inline int maybe_freelist_push(PyTupleObject *);
/* Allocate an uninitialized tuple object. Before making it public, following
steps must be done:
- Initialize its items.
- Call _PyObject_GC_TRACK() on it.
Because the empty tuple is always reused and it's already tracked by GC,
this function must not be called with size == 0 (unless from PyTuple_New()
which wraps this function).
*/
static PyTupleObject *
tuple_alloc(Py_ssize_t size)
{
if (size < 0) {
PyErr_BadInternalCall();
return NULL;
}
assert(size != 0); // The empty tuple is statically allocated.
Py_ssize_t index = size - 1;
if (index < PyTuple_MAXSAVESIZE) {
PyTupleObject *op = _Py_FREELIST_POP(PyTupleObject, tuples[index]);
if (op != NULL) {
_PyTuple_RESET_HASH_CACHE(op);
return op;
}
}
/* Check for overflow */
if ((size_t)size > ((size_t)PY_SSIZE_T_MAX - (sizeof(PyTupleObject) -
sizeof(PyObject *))) / sizeof(PyObject *)) {
return (PyTupleObject *)PyErr_NoMemory();
}
PyTupleObject *result = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size);
if (result != NULL) {
_PyTuple_RESET_HASH_CACHE(result);
}
return result;
}
// The empty tuple singleton is not tracked by the GC.
// It does not contain any Python object.
// Note that tuple subclasses have their own empty instances.
static inline PyObject *
tuple_get_empty(void)
{
return (PyObject *)&_Py_SINGLETON(tuple_empty);
}
PyObject *
PyTuple_New(Py_ssize_t size)
{
PyTupleObject *op;
if (size == 0) {
return tuple_get_empty();
}
op = tuple_alloc(size);
if (op == NULL) {
return NULL;
}
for (Py_ssize_t i = 0; i < size; i++) {
op->ob_item[i] = NULL;
}
_PyObject_GC_TRACK(op);
return (PyObject *) op;
}
Py_ssize_t
PyTuple_Size(PyObject *op)
{
if (!PyTuple_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
else
return Py_SIZE(op);
}
PyObject *
PyTuple_GetItem(PyObject *op, Py_ssize_t i)
{
if (!PyTuple_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
if (i < 0 || i >= Py_SIZE(op)) {
PyErr_SetString(PyExc_IndexError, "tuple index out of range");
return NULL;
}
return ((PyTupleObject *)op) -> ob_item[i];
}
int
PyTuple_SetItem(PyObject *op, Py_ssize_t i, PyObject *newitem)
{
PyObject **p;
if (!PyTuple_Check(op) || !_PyObject_IsUniquelyReferenced(op)) {
Py_XDECREF(newitem);
PyErr_BadInternalCall();
return -1;
}
if (i < 0 || i >= Py_SIZE(op)) {
Py_XDECREF(newitem);
PyErr_SetString(PyExc_IndexError,
"tuple assignment index out of range");
return -1;
}
p = ((PyTupleObject *)op) -> ob_item + i;
Py_XSETREF(*p, newitem);
return 0;
}
void
_PyTuple_MaybeUntrack(PyObject *op)
{
PyTupleObject *t;
Py_ssize_t i, n;
if (!PyTuple_CheckExact(op) || !_PyObject_GC_IS_TRACKED(op))
return;
t = (PyTupleObject *) op;
n = Py_SIZE(t);
for (i = 0; i < n; i++) {
PyObject *elt = PyTuple_GET_ITEM(t, i);
/* Tuple with NULL elements aren't
fully constructed, don't untrack
them yet. */
if (!elt ||
_PyObject_GC_MAY_BE_TRACKED(elt))
return;
}
_PyObject_GC_UNTRACK(op);
}
/* Fast, but conservative check if an object maybe tracked
May return true for an object that is not tracked,
Will always return true for an object that is tracked.
This is a temporary workaround until _PyObject_GC_IS_TRACKED
becomes fast and safe to call on non-GC objects.
*/
static bool
maybe_tracked(PyObject *ob)
{
return _PyType_IS_GC(Py_TYPE(ob));
}
PyObject *
PyTuple_Pack(Py_ssize_t n, ...)
{
Py_ssize_t i;
PyObject *o;
PyObject **items;
va_list vargs;
bool track = false;
if (n == 0) {
return tuple_get_empty();
}
va_start(vargs, n);
PyTupleObject *result = tuple_alloc(n);
if (result == NULL) {
va_end(vargs);
return NULL;
}
items = result->ob_item;
for (i = 0; i < n; i++) {
o = va_arg(vargs, PyObject *);
if (!track && maybe_tracked(o)) {
track = true;
}
items[i] = Py_NewRef(o);
}
va_end(vargs);
if (track) {
_PyObject_GC_TRACK(result);
}
return (PyObject *)result;
}
PyObject *
_PyTuple_FromPair(PyObject *first, PyObject *second)
{
assert(first != NULL);
assert(second != NULL);
return _PyTuple_FromPairSteal(Py_NewRef(first), Py_NewRef(second));
}
PyObject *
_PyTuple_FromPairSteal(PyObject *first, PyObject *second)
{
assert(first != NULL);
assert(second != NULL);
PyTupleObject *op = tuple_alloc(2);
if (op == NULL) {
Py_DECREF(first);
Py_DECREF(second);
return NULL;
}
PyObject **items = op->ob_item;
items[0] = first;
items[1] = second;
if (maybe_tracked(first) || maybe_tracked(second)) {
_PyObject_GC_TRACK(op);
}
return (PyObject *)op;
}
/* Methods */
/*
Free of a tuple where all contents have been stolen and
is now untracked by GC. This operation is thus non-escaping.
*/
void
_PyStolenTuple_Free(PyObject *obj)
{
assert(PyTuple_CheckExact(obj));
PyTupleObject *op = _PyTuple_CAST(obj);
assert(Py_SIZE(op) != 0);
assert(!_PyObject_GC_IS_TRACKED(obj));
// This will abort on the empty singleton (if there is one).
if (!maybe_freelist_push(op)) {
PyTuple_Type.tp_free((PyObject *)op);
}
}
static void
tuple_dealloc(PyObject *self)
{
PyTupleObject *op = _PyTuple_CAST(self);
if (Py_SIZE(op) == 0) {
/* The empty tuple is statically allocated. */
if (op == &_Py_SINGLETON(tuple_empty)) {
#ifdef Py_DEBUG
_Py_FatalRefcountError("deallocating the empty tuple singleton");
#else
return;
#endif
}
#ifdef Py_DEBUG
/* tuple subclasses have their own empty instances. */
assert(!PyTuple_CheckExact(op));
#endif
}
PyObject_GC_UnTrack(op);
Py_ssize_t i = Py_SIZE(op);
while (--i >= 0) {
Py_XDECREF(op->ob_item[i]);
}
// This will abort on the empty singleton (if there is one).
if (!maybe_freelist_push(op)) {
Py_TYPE(op)->tp_free((PyObject *)op);
}
}
static PyObject *
tuple_repr(PyObject *self)
{
PyTupleObject *v = _PyTuple_CAST(self);
Py_ssize_t n = PyTuple_GET_SIZE(v);
if (n == 0) {
return PyUnicode_FromString("()");
}
/* While not mutable, it is still possible to end up with a cycle in a
tuple through an object that stores itself within a tuple (and thus
infinitely asks for the repr of itself). This should only be
possible within a type. */
int res = Py_ReprEnter((PyObject *)v);
if (res != 0) {
return res > 0 ? PyUnicode_FromString("(...)") : NULL;
}
Py_ssize_t prealloc;
if (n > 1) {
// "(" + "1" + ", 2" * (len - 1) + ")"
prealloc = 1 + 1 + (2 + 1) * (n - 1) + 1;
}
else {
// "(1,)"
prealloc = 4;
}
PyUnicodeWriter *writer = PyUnicodeWriter_Create(prealloc);
if (writer == NULL) {
goto error;
}
if (PyUnicodeWriter_WriteChar(writer, '(') < 0) {
goto error;
}
/* Do repr() on each element. */
for (Py_ssize_t i = 0; i < n; ++i) {
if (i > 0) {
if (PyUnicodeWriter_WriteChar(writer, ',') < 0) {
goto error;
}
if (PyUnicodeWriter_WriteChar(writer, ' ') < 0) {
goto error;
}
}
if (PyUnicodeWriter_WriteRepr(writer, v->ob_item[i]) < 0) {
goto error;
}
}
if (n == 1) {
if (PyUnicodeWriter_WriteChar(writer, ',') < 0) {
goto error;
}
}
if (PyUnicodeWriter_WriteChar(writer, ')') < 0) {
goto error;
}
Py_ReprLeave((PyObject *)v);
return PyUnicodeWriter_Finish(writer);
error:
PyUnicodeWriter_Discard(writer);
Py_ReprLeave((PyObject *)v);
return NULL;
}
/* Hash for tuples. This is a slightly simplified version of the xxHash
non-cryptographic hash:
- we do not use any parallelism, there is only 1 accumulator.
- we drop the final mixing since this is just a permutation of the
output space: it does not help against collisions.
- at the end, we mangle the length with a single constant.
For the xxHash specification, see
https://github.com/Cyan4973/xxHash/blob/master/doc/xxhash_spec.md
The constants for the hash function are defined in pycore_tuple.h.
If you update this code, update also frozendict_pair_hash() which copied
this code.
*/
static Py_hash_t
tuple_hash(PyObject *op)
{
PyTupleObject *v = _PyTuple_CAST(op);
Py_uhash_t acc = FT_ATOMIC_LOAD_SSIZE_RELAXED(v->ob_hash);
if (acc != (Py_uhash_t)-1) {
return acc;
}
Py_ssize_t len = Py_SIZE(v);
PyObject **item = v->ob_item;
acc = _PyTuple_HASH_XXPRIME_5;
for (Py_ssize_t i = 0; i < len; i++) {
Py_uhash_t lane = PyObject_Hash(item[i]);
if (lane == (Py_uhash_t)-1) {
return -1;
}
acc += lane * _PyTuple_HASH_XXPRIME_2;
acc = _PyTuple_HASH_XXROTATE(acc);
acc *= _PyTuple_HASH_XXPRIME_1;
}
/* Add input length, mangled to keep the historical value of hash(()). */
acc += len ^ (_PyTuple_HASH_XXPRIME_5 ^ 3527539UL);
if (acc == (Py_uhash_t)-1) {
acc = 1546275796;
}
FT_ATOMIC_STORE_SSIZE_RELAXED(v->ob_hash, acc);
return acc;
}
static Py_ssize_t
tuple_length(PyObject *self)
{
PyTupleObject *a = _PyTuple_CAST(self);
return Py_SIZE(a);
}
static int
tuple_contains(PyObject *self, PyObject *el)
{
PyTupleObject *a = _PyTuple_CAST(self);
int cmp = 0;
for (Py_ssize_t i = 0; cmp == 0 && i < Py_SIZE(a); ++i) {
cmp = PyObject_RichCompareBool(PyTuple_GET_ITEM(a, i), el, Py_EQ);
}
return cmp;
}
static PyObject *
tuple_item(PyObject *op, Py_ssize_t i)
{
PyTupleObject *a = _PyTuple_CAST(op);
if (i < 0 || i >= Py_SIZE(a)) {
PyErr_SetString(PyExc_IndexError, "tuple index out of range");
return NULL;
}
return Py_NewRef(a->ob_item[i]);
}
PyObject *
PyTuple_FromArray(PyObject *const *src, Py_ssize_t n)
{
if (n == 0) {
return tuple_get_empty();
}
PyTupleObject *tuple = tuple_alloc(n);
if (tuple == NULL) {
return NULL;
}
PyObject **dst = tuple->ob_item;
bool track = false;
for (Py_ssize_t i = 0; i < n; i++) {
PyObject *item = src[i];
if (!track && maybe_tracked(item)) {
track = true;
}
dst[i] = Py_NewRef(item);
}
if (track) {
_PyObject_GC_TRACK(tuple);
}
return (PyObject *)tuple;
}
PyObject *
_PyTuple_FromStackRefStealOnSuccess(const _PyStackRef *src, Py_ssize_t n)
{
if (n == 0) {
return tuple_get_empty();
}
PyTupleObject *tuple = tuple_alloc(n);
if (tuple == NULL) {
return NULL;
}
PyObject **dst = tuple->ob_item;
bool track = false;
for (Py_ssize_t i = 0; i < n; i++) {
PyObject *item = PyStackRef_AsPyObjectSteal(src[i]);
if (!track && maybe_tracked(item)) {
track = true;
}
dst[i] = item;
}
if (track) {
_PyObject_GC_TRACK(tuple);
}
return (PyObject *)tuple;
}
PyObject *
_PyTuple_FromArraySteal(PyObject *const *src, Py_ssize_t n)
{
if (n == 0) {
return tuple_get_empty();
}
PyTupleObject *tuple = tuple_alloc(n);
if (tuple == NULL) {
for (Py_ssize_t i = 0; i < n; i++) {
Py_DECREF(src[i]);
}
return NULL;
}
PyObject **dst = tuple->ob_item;
for (Py_ssize_t i = 0; i < n; i++) {
PyObject *item = src[i];
dst[i] = item;
}
_PyObject_GC_TRACK(tuple);
return (PyObject *)tuple;
}
static PyObject *
tuple_slice(PyTupleObject *a, Py_ssize_t ilow,
Py_ssize_t ihigh)
{
if (ilow < 0)
ilow = 0;
if (ihigh > Py_SIZE(a))
ihigh = Py_SIZE(a);
if (ihigh < ilow)
ihigh = ilow;
if (ilow == 0 && ihigh == Py_SIZE(a) && PyTuple_CheckExact(a)) {
return Py_NewRef(a);
}
return PyTuple_FromArray(a->ob_item + ilow, ihigh - ilow);
}
PyObject *
_PyTuple_BinarySlice(PyObject *container, PyObject *start, PyObject *stop)
{
assert(PyTuple_CheckExact(container));
Py_ssize_t len = Py_SIZE(container);
Py_ssize_t istart, istop;
if (!_PyEval_UnpackIndices(start, stop, len, &istart, &istop)) {
return NULL;
}
if (istart == 0 && istop == len) {
return Py_NewRef(container);
}
if (istop < istart) {
istop = istart;
}
return PyTuple_FromArray(((PyTupleObject *)container)->ob_item + istart,
istop - istart);
}
PyObject *
PyTuple_GetSlice(PyObject *op, Py_ssize_t i, Py_ssize_t j)
{
if (op == NULL || !PyTuple_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return tuple_slice((PyTupleObject *)op, i, j);
}
PyObject *
_PyTuple_Concat(PyObject *aa, PyObject *bb)
{
PyTupleObject *a = _PyTuple_CAST(aa);
if (Py_SIZE(a) == 0 && PyTuple_CheckExact(bb)) {
return Py_NewRef(bb);
}
if (!PyTuple_Check(bb)) {
PyErr_Format(PyExc_TypeError,
"can only concatenate tuple (not \"%.200s\") to tuple",
Py_TYPE(bb)->tp_name);
return NULL;
}
PyTupleObject *b = (PyTupleObject *)bb;
if (Py_SIZE(b) == 0 && PyTuple_CheckExact(a)) {
return Py_NewRef(a);
}
assert((size_t)Py_SIZE(a) + (size_t)Py_SIZE(b) < PY_SSIZE_T_MAX);
Py_ssize_t size = Py_SIZE(a) + Py_SIZE(b);
if (size == 0) {
return tuple_get_empty();
}
PyTupleObject *np = tuple_alloc(size);
if (np == NULL) {
return NULL;
}
PyObject **src = a->ob_item;
PyObject **dest = np->ob_item;
for (Py_ssize_t i = 0; i < Py_SIZE(a); i++) {
PyObject *v = src[i];
dest[i] = Py_NewRef(v);
}
src = b->ob_item;
dest = np->ob_item + Py_SIZE(a);
for (Py_ssize_t i = 0; i < Py_SIZE(b); i++) {
PyObject *v = src[i];
dest[i] = Py_NewRef(v);
}
_PyObject_GC_TRACK(np);
return (PyObject *)np;
}
PyObject *
_PyTuple_Repeat(PyObject *self, Py_ssize_t n)
{
PyTupleObject *a = _PyTuple_CAST(self);
const Py_ssize_t input_size = Py_SIZE(a);
if (input_size == 0 || n == 1) {
if (PyTuple_CheckExact(a)) {
/* Since tuples are immutable, we can return a shared
copy in this case */
return Py_NewRef(a);
}
}
if (input_size == 0 || n <= 0) {
return tuple_get_empty();
}
assert(n>0);
if (input_size > PY_SSIZE_T_MAX / n)
return PyErr_NoMemory();
Py_ssize_t output_size = input_size * n;
PyTupleObject *np = tuple_alloc(output_size);
if (np == NULL)
return NULL;
PyObject **dest = np->ob_item;
if (input_size == 1) {
PyObject *elem = a->ob_item[0];
_Py_RefcntAdd(elem, n);
PyObject **dest_end = dest + output_size;
while (dest < dest_end) {
*dest++ = elem;
}
}
else {
PyObject **src = a->ob_item;
PyObject **src_end = src + input_size;
while (src < src_end) {
_Py_RefcntAdd(*src, n);
*dest++ = *src++;
}
_Py_memory_repeat((char *)np->ob_item, sizeof(PyObject *)*output_size,
sizeof(PyObject *)*input_size);
}
_PyObject_GC_TRACK(np);
return (PyObject *) np;
}
/*[clinic input]
tuple.index
value: object
start: slice_index(accept={int}) = 0
stop: slice_index(accept={int}, c_default="PY_SSIZE_T_MAX") = sys.maxsize
/
Return first index of value.
Raises ValueError if the value is not present.
[clinic start generated code]*/
static PyObject *
tuple_index_impl(PyTupleObject *self, PyObject *value, Py_ssize_t start,
Py_ssize_t stop)
/*[clinic end generated code: output=07b6f9f3cb5c33eb input=fb39e9874a21fe3f]*/
{
Py_ssize_t i;
if (start < 0) {
start += Py_SIZE(self);
if (start < 0)
start = 0;
}
if (stop < 0) {
stop += Py_SIZE(self);
}
else if (stop > Py_SIZE(self)) {
stop = Py_SIZE(self);
}
for (i = start; i < stop; i++) {
int cmp = PyObject_RichCompareBool(self->ob_item[i], value, Py_EQ);
if (cmp > 0)
return PyLong_FromSsize_t(i);
else if (cmp < 0)
return NULL;
}
PyErr_SetString(PyExc_ValueError, "tuple.index(x): x not in tuple");
return NULL;
}
/*[clinic input]
tuple.count
value: object
/
Return number of occurrences of value.
[clinic start generated code]*/
static PyObject *
tuple_count_impl(PyTupleObject *self, PyObject *value)
/*[clinic end generated code: output=cf02888d4bc15d7a input=531721aff65bd772]*/
{
Py_ssize_t count = 0;
Py_ssize_t i;
for (i = 0; i < Py_SIZE(self); i++) {
int cmp = PyObject_RichCompareBool(self->ob_item[i], value, Py_EQ);
if (cmp > 0)
count++;
else if (cmp < 0)
return NULL;
}
return PyLong_FromSsize_t(count);
}
static int
tuple_traverse(PyObject *self, visitproc visit, void *arg)
{
PyTupleObject *o = _PyTuple_CAST(self);
for (Py_ssize_t i = Py_SIZE(o); --i >= 0; ) {
Py_VISIT(o->ob_item[i]);
}
return 0;
}
static PyObject *
tuple_richcompare(PyObject *v, PyObject *w, int op)
{
PyTupleObject *vt, *wt;
Py_ssize_t i;
Py_ssize_t vlen, wlen;
if (!PyTuple_Check(v) || !PyTuple_Check(w))
Py_RETURN_NOTIMPLEMENTED;
vt = (PyTupleObject *)v;
wt = (PyTupleObject *)w;
vlen = Py_SIZE(vt);
wlen = Py_SIZE(wt);
/* Note: the corresponding code for lists has an "early out" test
* here when op is EQ or NE and the lengths differ. That pays there,
* but Tim was unable to find any real code where EQ/NE tuple
* compares don't have the same length, so testing for it here would
* have cost without benefit.
*/
/* Search for the first index where items are different.
* Note that because tuples are immutable, it's safe to reuse
* vlen and wlen across the comparison calls.
*/
for (i = 0; i < vlen && i < wlen; i++) {
int k = PyObject_RichCompareBool(vt->ob_item[i],
wt->ob_item[i], Py_EQ);
if (k < 0)
return NULL;
if (!k)
break;
}
if (i >= vlen || i >= wlen) {
/* No more items to compare -- compare sizes */
Py_RETURN_RICHCOMPARE(vlen, wlen, op);
}
/* We have an item that differs -- shortcuts for EQ/NE */
if (op == Py_EQ) {
Py_RETURN_FALSE;
}
if (op == Py_NE) {
Py_RETURN_TRUE;
}
/* Compare the final item again using the proper operator */
return PyObject_RichCompare(vt->ob_item[i], wt->ob_item[i], op);
}
static PyObject *
tuple_subtype_new(PyTypeObject *type, PyObject *iterable);
/*[clinic input]
@vectorcall
@classmethod
tuple.__new__ as tuple_new
iterable: object(c_default="NULL") = ()
/
Built-in immutable sequence.
If no argument is given, the constructor returns an empty tuple.
If iterable is specified the tuple is initialized from iterable's items.
If the argument is a tuple, the return value is the same object.
[clinic start generated code]*/
static PyObject *
tuple_new_impl(PyTypeObject *type, PyObject *iterable)
/*[clinic end generated code: output=4546d9f0d469bce7 input=8fdda913493ebe48]*/
{
if (type != &PyTuple_Type)
return tuple_subtype_new(type, iterable);
if (iterable == NULL) {
return tuple_get_empty();
}
else {
return PySequence_Tuple(iterable);
}
}
static PyObject *
tuple_subtype_new(PyTypeObject *type, PyObject *iterable)
{
PyObject *tmp, *newobj, *item;
Py_ssize_t i, n;
assert(PyType_IsSubtype(type, &PyTuple_Type));
// tuple subclasses must implement the GC protocol
assert(_PyType_IS_GC(type));
tmp = tuple_new_impl(&PyTuple_Type, iterable);
if (tmp == NULL)
return NULL;
assert(PyTuple_Check(tmp));
/* This may allocate an empty tuple that is not the global one. */
newobj = type->tp_alloc(type, n = PyTuple_GET_SIZE(tmp));
if (newobj == NULL) {
Py_DECREF(tmp);
return NULL;
}
for (i = 0; i < n; i++) {
item = PyTuple_GET_ITEM(tmp, i);
PyTuple_SET_ITEM(newobj, i, Py_NewRef(item));
}
Py_DECREF(tmp);
_PyTuple_RESET_HASH_CACHE(newobj);
// Don't track if a subclass tp_alloc is PyType_GenericAlloc()
if (!_PyObject_GC_IS_TRACKED(newobj)) {
_PyObject_GC_TRACK(newobj);
}
return newobj;
}
static PySequenceMethods tuple_as_sequence = {
tuple_length, /* sq_length */
_PyTuple_Concat, /* sq_concat */
_PyTuple_Repeat, /* sq_repeat */
tuple_item, /* sq_item */
0, /* sq_slice */
0, /* sq_ass_item */
0, /* sq_ass_slice */
tuple_contains, /* sq_contains */
};
static _PyObjectIndexPair
tuple_iteritem(PyObject *obj, Py_ssize_t index)
{
if (index >= PyTuple_GET_SIZE(obj)) {
return (_PyObjectIndexPair) { .object = NULL, .index = index };
}
PyObject *result = PyTuple_GET_ITEM(obj, index);
Py_INCREF(result);
return (_PyObjectIndexPair) { .object = result, .index = index + 1 };
}
static PyObject*
tuple_subscript(PyObject *op, PyObject* item)
{
PyTupleObject *self = _PyTuple_CAST(op);
if (_PyIndex_Check(item)) {
Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
if (i == -1 && PyErr_Occurred())
return NULL;
if (i < 0)
i += PyTuple_GET_SIZE(self);
return tuple_item(op, i);
}
else if (PySlice_Check(item)) {
Py_ssize_t start, stop, step, slicelength, i;
size_t cur;
PyObject* it;
PyObject **src, **dest;
if (PySlice_Unpack(item, &start, &stop, &step) < 0) {
return NULL;
}
slicelength = PySlice_AdjustIndices(PyTuple_GET_SIZE(self), &start,
&stop, step);
if (slicelength <= 0) {
return tuple_get_empty();
}
else if (start == 0 && step == 1 &&
slicelength == PyTuple_GET_SIZE(self) &&
PyTuple_CheckExact(self)) {
return Py_NewRef(self);
}
else {
PyTupleObject* result = tuple_alloc(slicelength);
if (!result) return NULL;
src = self->ob_item;
dest = result->ob_item;
for (cur = start, i = 0; i < slicelength;
cur += step, i++) {
it = Py_NewRef(src[cur]);
dest[i] = it;
}
_PyObject_GC_TRACK(result);
return (PyObject *)result;
}
}
else {
PyErr_Format(PyExc_TypeError,
"tuple indices must be integers or slices, not %.200s",
Py_TYPE(item)->tp_name);
return NULL;
}
}
/*[clinic input]
tuple.__getnewargs__
[clinic start generated code]*/
static PyObject *
tuple___getnewargs___impl(PyTupleObject *self)
/*[clinic end generated code: output=25e06e3ee56027e2 input=1aeb4b286a21639a]*/
{
return Py_BuildValue("(N)", tuple_slice(self, 0, Py_SIZE(self)));
}
PyDoc_STRVAR(tuple_class_getitem_doc,
"Tuples are generic over the types of their contents.\n\n\
For example, use ``tuple[int, str]`` for a pair whose first element\n\
is an int and second element is a string.\n\n\
Tuples also support the form ``tuple[T, ...]`` to indicate\n\
an arbitrary length tuple of elements of type T.");
static PyMethodDef tuple_methods[] = {
TUPLE___GETNEWARGS___METHODDEF
TUPLE_INDEX_METHODDEF
TUPLE_COUNT_METHODDEF
{"__class_getitem__", Py_GenericAlias, METH_O|METH_CLASS, tuple_class_getitem_doc},
{NULL, NULL} /* sentinel */
};
static PyMappingMethods tuple_as_mapping = {
tuple_length,
tuple_subscript,
0
};
static PyObject *tuple_iter(PyObject *seq);
PyTypeObject PyTuple_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"tuple",
sizeof(PyTupleObject) - sizeof(PyObject *),
sizeof(PyObject *),
tuple_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
tuple_repr, /* tp_repr */
0, /* tp_as_number */
&tuple_as_sequence, /* tp_as_sequence */
&tuple_as_mapping, /* tp_as_mapping */
tuple_hash, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_BASETYPE | Py_TPFLAGS_TUPLE_SUBCLASS |
_Py_TPFLAGS_MATCH_SELF | Py_TPFLAGS_SEQUENCE, /* tp_flags */
tuple_new__doc__, /* tp_doc */
tuple_traverse, /* tp_traverse */
0, /* tp_clear */
tuple_richcompare, /* tp_richcompare */
0, /* tp_weaklistoffset */
tuple_iter, /* tp_iter */
0, /* tp_iternext */
tuple_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
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