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/* enumerate object */

#include "Python.h"

#include "pycore_call.h" // _PyObject_CallNoArgs()

#include "pycore_long.h" // _PyLong_GetOne()

#include "pycore_modsupport.h" // _PyArg_NoKwnames()

#include "pycore_object.h" // _PyObject_GC_TRACK()

#include "pycore_unicodeobject.h" // _PyUnicode_EqualToASCIIString

#include "pycore_tuple.h" // _PyTuple_Recycle()

#include "clinic/enumobject.c.h"

/*[clinic input]

class enumerate "enumobject *" "&PyEnum_Type"

class reversed "reversedobject *" "&PyReversed_Type"

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=d2dfdf1a88c88975]*/

typedef struct {

PyObject_HEAD

Py_ssize_t en_index; /* current index of enumeration */

PyObject* en_sit; /* secondary iterator of enumeration */

PyObject* en_result; /* result tuple */

PyObject* en_longindex; /* index for sequences >= PY_SSIZE_T_MAX */

PyObject* one; /* borrowed reference */

} enumobject;

#define _enumobject_CAST(op) ((enumobject *)(op))

/*[clinic input]

@vectorcall

@classmethod

enumerate.__new__ as enum_new

iterable: object

an object supporting iteration

start: object = 0

Return an enumerate object.

The enumerate object yields pairs containing a count (from start, which

defaults to zero) and a value yielded by the iterable argument.

enumerate is useful for obtaining an indexed list:

(0, seq[0]), (1, seq[1]), (2, seq[2]), ...

[clinic start generated code]*/

static PyObject *

enum_new_impl(PyTypeObject *type, PyObject *iterable, PyObject *start)

/*[clinic end generated code: output=e95e6e439f812c10 input=a139e88889360e8f]*/

{

enumobject *en;

en = (enumobject *)type->tp_alloc(type, 0);

if (en == NULL)

return NULL;

if (start != NULL) {

start = PyNumber_Index(start);

if (start == NULL) {

Py_DECREF(en);

return NULL;

}

assert(PyLong_Check(start));

en->en_index = PyLong_AsSsize_t(start);

if (en->en_index == -1 && PyErr_Occurred()) {

PyErr_Clear();

en->en_index = PY_SSIZE_T_MAX;

en->en_longindex = start;

} else {

en->en_longindex = NULL;

Py_DECREF(start);

}

} else {

en->en_index = 0;

en->en_longindex = NULL;

}

en->en_sit = PyObject_GetIter(iterable);

if (en->en_sit == NULL) {

Py_DECREF(en);

return NULL;

}

en->en_result = _PyTuple_FromPairSteal(Py_None, Py_None);

if (en->en_result == NULL) {

Py_DECREF(en);

return NULL;

}

en->one = _PyLong_GetOne(); /* borrowed reference */

return (PyObject *)en;

}

static void

enum_dealloc(PyObject *op)

{

enumobject *en = _enumobject_CAST(op);

PyObject_GC_UnTrack(en);

Py_XDECREF(en->en_sit);

Py_XDECREF(en->en_result);

Py_XDECREF(en->en_longindex);

Py_TYPE(en)->tp_free(en);

}

static int

enum_traverse(PyObject *op, visitproc visit, void *arg)

{

enumobject *en = _enumobject_CAST(op);

Py_VISIT(en->en_sit);

Py_VISIT(en->en_result);

Py_VISIT(en->en_longindex);

return 0;

}

// increment en_longindex with lock held, return the next index to be used

// or NULL on error

static inline PyObject *

increment_longindex_lock_held(enumobject *en)

{

if (en->en_longindex == NULL) {

en->en_longindex = PyLong_FromSsize_t(PY_SSIZE_T_MAX);

if (en->en_longindex == NULL) {

return NULL;

}

assert(en->en_longindex != NULL);

// We hold one reference to "next_index" (a.k.a. the old value of

// en->en_longindex); we'll either return it or keep it in en->en_longindex

PyObject *next_index = en->en_longindex;

PyObject *stepped_up = PyNumber_Add(next_index, en->one);

if (stepped_up == NULL) {

return NULL;

}

en->en_longindex = stepped_up;

return next_index;

}

static PyObject *

enum_next_long(enumobject *en, PyObject* next_item)

{

PyObject *result = en->en_result;

PyObject *next_index;

PyObject *old_index;

PyObject *old_item;

Py_BEGIN_CRITICAL_SECTION(en);

next_index = increment_longindex_lock_held(en);

Py_END_CRITICAL_SECTION();

if (next_index == NULL) {

Py_DECREF(next_item);

return NULL;

}

if (_PyObject_IsUniquelyReferenced(result)) {

Py_INCREF(result);

old_index = PyTuple_GET_ITEM(result, 0);

old_item = PyTuple_GET_ITEM(result, 1);

PyTuple_SET_ITEM(result, 0, next_index);

PyTuple_SET_ITEM(result, 1, next_item);

Py_DECREF(old_index);

Py_DECREF(old_item);

// bpo-42536: The GC may have untracked this result tuple. Since we're

// recycling it, make sure it's tracked again:

_PyTuple_Recycle(result);

return result;

}

return _PyTuple_FromPairSteal(next_index, next_item);

}

static PyObject *

enum_next(PyObject *op)

{

enumobject *en = _enumobject_CAST(op);

PyObject *next_index;

PyObject *next_item;

PyObject *result = en->en_result;

PyObject *it = en->en_sit;

PyObject *old_index;

PyObject *old_item;

next_item = (*Py_TYPE(it)->tp_iternext)(it);

if (next_item == NULL)

return NULL;

Py_ssize_t en_index = FT_ATOMIC_LOAD_SSIZE_RELAXED(en->en_index);

if (en_index == PY_SSIZE_T_MAX)

return enum_next_long(en, next_item);

next_index = PyLong_FromSsize_t(en_index);

if (next_index == NULL) {

Py_DECREF(next_item);

return NULL;

}

FT_ATOMIC_STORE_SSIZE_RELAXED(en->en_index, en_index + 1);

if (_PyObject_IsUniquelyReferenced(result)) {

Py_INCREF(result);

old_index = PyTuple_GET_ITEM(result, 0);

old_item = PyTuple_GET_ITEM(result, 1);

PyTuple_SET_ITEM(result, 0, next_index);

PyTuple_SET_ITEM(result, 1, next_item);

Py_DECREF(old_index);

Py_DECREF(old_item);

// bpo-42536: The GC may have untracked this result tuple. Since we're

// recycling it, make sure it's tracked again:

_PyTuple_Recycle(result);

return result;

}

return _PyTuple_FromPairSteal(next_index, next_item);

}

static PyObject *

enum_reduce(PyObject *op, PyObject *Py_UNUSED(ignored))

{

enumobject *en = _enumobject_CAST(op);

PyObject *result;

Py_BEGIN_CRITICAL_SECTION(en);

if (en->en_longindex != NULL) {

result = Py_BuildValue("O(OO)", Py_TYPE(en), en->en_sit, en->en_longindex);

}

else {

Py_ssize_t en_index = FT_ATOMIC_LOAD_SSIZE_RELAXED(en->en_index);

result = Py_BuildValue("O(On)", Py_TYPE(en), en->en_sit, en_index);

}

Py_END_CRITICAL_SECTION();

return result;

}

PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");

static PyMethodDef enum_methods[] = {

{"__reduce__", enum_reduce, METH_NOARGS, reduce_doc},

{"__class_getitem__", Py_GenericAlias,

METH_O|METH_CLASS, PyDoc_STR("'enumerate' objects are generic over the type of their values")},

{NULL, NULL} /* sentinel */

};

PyTypeObject PyEnum_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"enumerate", /* tp_name */

sizeof(enumobject), /* tp_basicsize */

0, /* tp_itemsize */

/* methods */

enum_dealloc, /* tp_dealloc */

0, /* tp_vectorcall_offset */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_as_async */

0, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* 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, /* tp_flags */

enum_new__doc__, /* tp_doc */

enum_traverse, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

0, /* tp_weaklistoffset */

PyObject_SelfIter, /* tp_iter */

enum_next, /* tp_iternext */

enum_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 */

PyType_GenericAlloc, /* tp_alloc */

enum_new, /* tp_new */

PyObject_GC_Del, /* tp_free */

.tp_vectorcall = enum_vectorcall

};

/* Reversed Object ***************************************************************/

typedef struct {

PyObject_HEAD

Py_ssize_t index;

PyObject* seq;

} reversedobject;

#define _reversedobject_CAST(op) ((reversedobject *)(op))

/*[clinic input]

@vectorcall

@classmethod

reversed.__new__ as reversed_new

object as seq: object

Return a reverse iterator over the values of the given sequence.

[clinic start generated code]*/

static PyObject *

reversed_new_impl(PyTypeObject *type, PyObject *seq)

/*[clinic end generated code: output=f7854cc1df26f570 input=7db568182ab28c59]*/

{

Py_ssize_t n;

PyObject *reversed_meth;

reversedobject *ro;

reversed_meth = _PyObject_LookupSpecial(seq, &_Py_ID(__reversed__));

if (reversed_meth == Py_None) {

Py_DECREF(reversed_meth);

PyErr_Format(PyExc_TypeError,

"'%.200s' object is not reversible",

Py_TYPE(seq)->tp_name);

return NULL;

}

if (reversed_meth != NULL) {

PyObject *res = _PyObject_CallNoArgs(reversed_meth);

Py_DECREF(reversed_meth);

return res;

}

else if (PyErr_Occurred())

return NULL;

if (!PySequence_Check(seq)) {

PyErr_Format(PyExc_TypeError,

"'%.200s' object is not reversible",

Py_TYPE(seq)->tp_name);

return NULL;

}

n = PySequence_Size(seq);

if (n == -1)

return NULL;

ro = (reversedobject *)type->tp_alloc(type, 0);

if (ro == NULL)

return NULL;

ro->index = n-1;

ro->seq = Py_NewRef(seq);

return (PyObject *)ro;

}

static void

reversed_dealloc(PyObject *op)

{

reversedobject *ro = _reversedobject_CAST(op);

PyObject_GC_UnTrack(ro);

Py_XDECREF(ro->seq);

Py_TYPE(ro)->tp_free(ro);

}

static int

reversed_traverse(PyObject *op, visitproc visit, void *arg)

{

reversedobject *ro = _reversedobject_CAST(op);

Py_VISIT(ro->seq);

return 0;

}

static PyObject *

reversed_next(PyObject *op)

{

reversedobject *ro = _reversedobject_CAST(op);

PyObject *item;

Py_ssize_t index = FT_ATOMIC_LOAD_SSIZE_RELAXED(ro->index);

if (index >= 0) {

item = PySequence_GetItem(ro->seq, index);

if (item != NULL) {

FT_ATOMIC_STORE_SSIZE_RELAXED(ro->index, index - 1);

return item;

}

if (PyErr_ExceptionMatches(PyExc_IndexError) ||

PyErr_ExceptionMatches(PyExc_StopIteration))

PyErr_Clear();

}

FT_ATOMIC_STORE_SSIZE_RELAXED(ro->index, -1);

#ifndef Py_GIL_DISABLED

Py_CLEAR(ro->seq);

#endif

return NULL;

}

static PyObject *

reversed_len(PyObject *op, PyObject *Py_UNUSED(ignored))

{

reversedobject *ro = _reversedobject_CAST(op);

Py_ssize_t position, seqsize;

Py_ssize_t index = FT_ATOMIC_LOAD_SSIZE_RELAXED(ro->index);

if (index == -1)

return PyLong_FromLong(0);

assert(ro->seq != NULL);

seqsize = PySequence_Size(ro->seq);

if (seqsize == -1)

return NULL;

position = index + 1;

return PyLong_FromSsize_t((seqsize < position) ? 0 : position);

}

PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");

static PyObject *

reversed_reduce(PyObject *op, PyObject *Py_UNUSED(ignored))

{

reversedobject *ro = _reversedobject_CAST(op);

Py_ssize_t index = FT_ATOMIC_LOAD_SSIZE_RELAXED(ro->index);

if (index != -1) {

return Py_BuildValue("O(O)n", Py_TYPE(ro), ro->seq, ro->index);

}

else {

return Py_BuildValue("O(())", Py_TYPE(ro));

}

static PyObject *

reversed_setstate(PyObject *op, PyObject *state)

{

reversedobject *ro = _reversedobject_CAST(op);

Py_ssize_t index = PyLong_AsSsize_t(state);

if (index == -1 && PyErr_Occurred())

return NULL;

Py_ssize_t ro_index = FT_ATOMIC_LOAD_SSIZE_RELAXED(ro->index);

// if the iterator is exhausted we do not set the state

// this is for backwards compatibility reasons. in practice this situation

// will not occur, see gh-120971

if (ro_index != -1) {

Py_ssize_t n = PySequence_Size(ro->seq);

if (n < 0)

return NULL;

if (index < -1)

index = -1;

else if (index > n-1)

index = n-1;

FT_ATOMIC_STORE_SSIZE_RELAXED(ro->index, index);

}

Py_RETURN_NONE;

}

PyDoc_STRVAR(setstate_doc, "Set state information for unpickling.");

static PyMethodDef reversediter_methods[] = {

{"__length_hint__", reversed_len, METH_NOARGS, length_hint_doc},

{"__reduce__", reversed_reduce, METH_NOARGS, reduce_doc},

{"__setstate__", reversed_setstate, METH_O, setstate_doc},

{NULL, NULL} /* sentinel */

};

PyTypeObject PyReversed_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"reversed", /* tp_name */

sizeof(reversedobject), /* tp_basicsize */

0, /* tp_itemsize */

/* methods */

reversed_dealloc, /* tp_dealloc */

0, /* tp_vectorcall_offset */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_as_async */

0, /* tp_repr */

0, /* tp_as_number */

0, /* tp_as_sequence */

0, /* tp_as_mapping */

0, /* 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, /* tp_flags */

reversed_new__doc__, /* tp_doc */

reversed_traverse, /* tp_traverse */

0, /* tp_clear */

0, /* tp_richcompare */

0, /* tp_weaklistoffset */

PyObject_SelfIter, /* tp_iter */

reversed_next, /* tp_iternext */

reversediter_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 */

PyType_GenericAlloc, /* tp_alloc */

reversed_new, /* tp_new */

PyObject_GC_Del, /* tp_free */

.tp_vectorcall = reversed_vectorcall,

};

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