[mirror_edk2.git] / AppPkg / Applications / Python / Python-2.7.10 / Objects / tupleobject.c

\r
/* Tuple object implementation */\r
\r
#include "Python.h"\r
\r
/* Speed optimization to avoid frequent malloc/free of small tuples */\r
#ifndef PyTuple_MAXSAVESIZE\r
#define PyTuple_MAXSAVESIZE     20  /* Largest tuple to save on free list */\r
#endif\r
#ifndef PyTuple_MAXFREELIST\r
#define PyTuple_MAXFREELIST  2000  /* Maximum number of tuples of each size to save */\r
#endif\r
\r
#if PyTuple_MAXSAVESIZE > 0\r
/* Entries 1 up to PyTuple_MAXSAVESIZE are free lists, entry 0 is the empty\r
   tuple () of which at most one instance will be allocated.\r
*/\r
static PyTupleObject *free_list[PyTuple_MAXSAVESIZE];\r
static int numfree[PyTuple_MAXSAVESIZE];\r
#endif\r
#ifdef COUNT_ALLOCS\r
Py_ssize_t fast_tuple_allocs;\r
Py_ssize_t tuple_zero_allocs;\r
#endif\r
\r
/* Debug statistic to count GC tracking of tuples.\r
   Please note that tuples are only untracked when considered by the GC, and\r
   many of them will be dead before. Therefore, a tracking rate close to 100%\r
   does not necessarily prove that the heuristic is inefficient.\r
*/\r
#ifdef SHOW_TRACK_COUNT\r
static Py_ssize_t count_untracked = 0;\r
static Py_ssize_t count_tracked = 0;\r
\r
static void\r
show_track(void)\r
{\r
    fprintf(stderr, "Tuples created: %" PY_FORMAT_SIZE_T "d\n",\r
        count_tracked + count_untracked);\r
    fprintf(stderr, "Tuples tracked by the GC: %" PY_FORMAT_SIZE_T\r
        "d\n", count_tracked);\r
    fprintf(stderr, "%.2f%% tuple tracking rate\n\n",\r
        (100.0*count_tracked/(count_untracked+count_tracked)));\r
}\r
#endif\r
\r
\r
PyObject *\r
PyTuple_New(register Py_ssize_t size)\r
{\r
    register PyTupleObject *op;\r
    Py_ssize_t i;\r
    if (size < 0) {\r
        PyErr_BadInternalCall();\r
        return NULL;\r
    }\r
#if PyTuple_MAXSAVESIZE > 0\r
    if (size == 0 && free_list[0]) {\r
        op = free_list[0];\r
        Py_INCREF(op);\r
#ifdef COUNT_ALLOCS\r
        tuple_zero_allocs++;\r
#endif\r
        return (PyObject *) op;\r
    }\r
    if (size < PyTuple_MAXSAVESIZE && (op = free_list[size]) != NULL) {\r
        free_list[size] = (PyTupleObject *) op->ob_item[0];\r
        numfree[size]--;\r
#ifdef COUNT_ALLOCS\r
        fast_tuple_allocs++;\r
#endif\r
        /* Inline PyObject_InitVar */\r
#ifdef Py_TRACE_REFS\r
        Py_SIZE(op) = size;\r
        Py_TYPE(op) = &PyTuple_Type;\r
#endif\r
        _Py_NewReference((PyObject *)op);\r
    }\r
    else\r
#endif\r
    {\r
        Py_ssize_t nbytes = size * sizeof(PyObject *);\r
        /* Check for overflow */\r
        if (nbytes / sizeof(PyObject *) != (size_t)size ||\r
            (nbytes > PY_SSIZE_T_MAX - sizeof(PyTupleObject) - sizeof(PyObject *)))\r
        {\r
            return PyErr_NoMemory();\r
        }\r
\r
        op = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size);\r
        if (op == NULL)\r
            return NULL;\r
    }\r
    for (i=0; i < size; i++)\r
        op->ob_item[i] = NULL;\r
#if PyTuple_MAXSAVESIZE > 0\r
    if (size == 0) {\r
        free_list[0] = op;\r
        ++numfree[0];\r
        Py_INCREF(op);          /* extra INCREF so that this is never freed */\r
    }\r
#endif\r
#ifdef SHOW_TRACK_COUNT\r
    count_tracked++;\r
#endif\r
    _PyObject_GC_TRACK(op);\r
    return (PyObject *) op;\r
}\r
\r
Py_ssize_t\r
PyTuple_Size(register PyObject *op)\r
{\r
    if (!PyTuple_Check(op)) {\r
        PyErr_BadInternalCall();\r
        return -1;\r
    }\r
    else\r
        return Py_SIZE(op);\r
}\r
\r
PyObject *\r
PyTuple_GetItem(register PyObject *op, register Py_ssize_t i)\r
{\r
    if (!PyTuple_Check(op)) {\r
        PyErr_BadInternalCall();\r
        return NULL;\r
    }\r
    if (i < 0 || i >= Py_SIZE(op)) {\r
        PyErr_SetString(PyExc_IndexError, "tuple index out of range");\r
        return NULL;\r
    }\r
    return ((PyTupleObject *)op) -> ob_item[i];\r
}\r
\r
int\r
PyTuple_SetItem(register PyObject *op, register Py_ssize_t i, PyObject *newitem)\r
{\r
    register PyObject *olditem;\r
    register PyObject **p;\r
    if (!PyTuple_Check(op) || op->ob_refcnt != 1) {\r
        Py_XDECREF(newitem);\r
        PyErr_BadInternalCall();\r
        return -1;\r
    }\r
    if (i < 0 || i >= Py_SIZE(op)) {\r
        Py_XDECREF(newitem);\r
        PyErr_SetString(PyExc_IndexError,\r
                        "tuple assignment index out of range");\r
        return -1;\r
    }\r
    p = ((PyTupleObject *)op) -> ob_item + i;\r
    olditem = *p;\r
    *p = newitem;\r
    Py_XDECREF(olditem);\r
    return 0;\r
}\r
\r
void\r
_PyTuple_MaybeUntrack(PyObject *op)\r
{\r
    PyTupleObject *t;\r
    Py_ssize_t i, n;\r
\r
    if (!PyTuple_CheckExact(op) || !_PyObject_GC_IS_TRACKED(op))\r
        return;\r
    t = (PyTupleObject *) op;\r
    n = Py_SIZE(t);\r
    for (i = 0; i < n; i++) {\r
        PyObject *elt = PyTuple_GET_ITEM(t, i);\r
        /* Tuple with NULL elements aren't\r
           fully constructed, don't untrack\r
           them yet. */\r
        if (!elt ||\r
            _PyObject_GC_MAY_BE_TRACKED(elt))\r
            return;\r
    }\r
#ifdef SHOW_TRACK_COUNT\r
    count_tracked--;\r
    count_untracked++;\r
#endif\r
    _PyObject_GC_UNTRACK(op);\r
}\r
\r
PyObject *\r
PyTuple_Pack(Py_ssize_t n, ...)\r
{\r
    Py_ssize_t i;\r
    PyObject *o;\r
    PyObject *result;\r
    PyObject **items;\r
    va_list vargs;\r
\r
    va_start(vargs, n);\r
    result = PyTuple_New(n);\r
    if (result == NULL) {\r
        va_end(vargs);\r
        return NULL;\r
    }\r
    items = ((PyTupleObject *)result)->ob_item;\r
    for (i = 0; i < n; i++) {\r
        o = va_arg(vargs, PyObject *);\r
        Py_INCREF(o);\r
        items[i] = o;\r
    }\r
    va_end(vargs);\r
    return result;\r
}\r
\r
\r
/* Methods */\r
\r
static void\r
tupledealloc(register PyTupleObject *op)\r
{\r
    register Py_ssize_t i;\r
    register Py_ssize_t len =  Py_SIZE(op);\r
    PyObject_GC_UnTrack(op);\r
    Py_TRASHCAN_SAFE_BEGIN(op)\r
    if (len > 0) {\r
        i = len;\r
        while (--i >= 0)\r
            Py_XDECREF(op->ob_item[i]);\r
#if PyTuple_MAXSAVESIZE > 0\r
        if (len < PyTuple_MAXSAVESIZE &&\r
            numfree[len] < PyTuple_MAXFREELIST &&\r
            Py_TYPE(op) == &PyTuple_Type)\r
        {\r
            op->ob_item[0] = (PyObject *) free_list[len];\r
            numfree[len]++;\r
            free_list[len] = op;\r
            goto done; /* return */\r
        }\r
#endif\r
    }\r
    Py_TYPE(op)->tp_free((PyObject *)op);\r
done:\r
    Py_TRASHCAN_SAFE_END(op)\r
}\r
\r
static int\r
tupleprint(PyTupleObject *op, FILE *fp, int flags)\r
{\r
    Py_ssize_t i;\r
    Py_BEGIN_ALLOW_THREADS\r
    fprintf(fp, "(");\r
    Py_END_ALLOW_THREADS\r
    for (i = 0; i < Py_SIZE(op); i++) {\r
        if (i > 0) {\r
            Py_BEGIN_ALLOW_THREADS\r
            fprintf(fp, ", ");\r
            Py_END_ALLOW_THREADS\r
        }\r
        if (PyObject_Print(op->ob_item[i], fp, 0) != 0)\r
            return -1;\r
    }\r
    i = Py_SIZE(op);\r
    Py_BEGIN_ALLOW_THREADS\r
    if (i == 1)\r
        fprintf(fp, ",");\r
    fprintf(fp, ")");\r
    Py_END_ALLOW_THREADS\r
    return 0;\r
}\r
\r
static PyObject *\r
tuplerepr(PyTupleObject *v)\r
{\r
    Py_ssize_t i, n;\r
    PyObject *s, *temp;\r
    PyObject *pieces, *result = NULL;\r
\r
    n = Py_SIZE(v);\r
    if (n == 0)\r
        return PyString_FromString("()");\r
\r
    /* While not mutable, it is still possible to end up with a cycle in a\r
       tuple through an object that stores itself within a tuple (and thus\r
       infinitely asks for the repr of itself). This should only be\r
       possible within a type. */\r
    i = Py_ReprEnter((PyObject *)v);\r
    if (i != 0) {\r
        return i > 0 ? PyString_FromString("(...)") : NULL;\r
    }\r
\r
    pieces = PyTuple_New(n);\r
    if (pieces == NULL)\r
        return NULL;\r
\r
    /* Do repr() on each element. */\r
    for (i = 0; i < n; ++i) {\r
        if (Py_EnterRecursiveCall(" while getting the repr of a tuple"))\r
            goto Done;\r
        s = PyObject_Repr(v->ob_item[i]);\r
        Py_LeaveRecursiveCall();\r
        if (s == NULL)\r
            goto Done;\r
        PyTuple_SET_ITEM(pieces, i, s);\r
    }\r
\r
    /* Add "()" decorations to the first and last items. */\r
    assert(n > 0);\r
    s = PyString_FromString("(");\r
    if (s == NULL)\r
        goto Done;\r
    temp = PyTuple_GET_ITEM(pieces, 0);\r
    PyString_ConcatAndDel(&s, temp);\r
    PyTuple_SET_ITEM(pieces, 0, s);\r
    if (s == NULL)\r
        goto Done;\r
\r
    s = PyString_FromString(n == 1 ? ",)" : ")");\r
    if (s == NULL)\r
        goto Done;\r
    temp = PyTuple_GET_ITEM(pieces, n-1);\r
    PyString_ConcatAndDel(&temp, s);\r
    PyTuple_SET_ITEM(pieces, n-1, temp);\r
    if (temp == NULL)\r
        goto Done;\r
\r
    /* Paste them all together with ", " between. */\r
    s = PyString_FromString(", ");\r
    if (s == NULL)\r
        goto Done;\r
    result = _PyString_Join(s, pieces);\r
    Py_DECREF(s);\r
\r
Done:\r
    Py_DECREF(pieces);\r
    Py_ReprLeave((PyObject *)v);\r
    return result;\r
}\r
\r
/* The addend 82520, was selected from the range(0, 1000000) for\r
   generating the greatest number of prime multipliers for tuples\r
   upto length eight:\r
\r
     1082527, 1165049, 1082531, 1165057, 1247581, 1330103, 1082533,\r
     1330111, 1412633, 1165069, 1247599, 1495177, 1577699\r
*/\r
\r
static long\r
tuplehash(PyTupleObject *v)\r
{\r
    register long x, y;\r
    register Py_ssize_t len = Py_SIZE(v);\r
    register PyObject **p;\r
    long mult = 1000003L;\r
    x = 0x345678L;\r
    p = v->ob_item;\r
    while (--len >= 0) {\r
        y = PyObject_Hash(*p++);\r
        if (y == -1)\r
            return -1;\r
        x = (x ^ y) * mult;\r
        /* the cast might truncate len; that doesn't change hash stability */\r
        mult += (long)(82520L + len + len);\r
    }\r
    x += 97531L;\r
    if (x == -1)\r
        x = -2;\r
    return x;\r
}\r
\r
static Py_ssize_t\r
tuplelength(PyTupleObject *a)\r
{\r
    return Py_SIZE(a);\r
}\r
\r
static int\r
tuplecontains(PyTupleObject *a, PyObject *el)\r
{\r
    Py_ssize_t i;\r
    int cmp;\r
\r
    for (i = 0, cmp = 0 ; cmp == 0 && i < Py_SIZE(a); ++i)\r
        cmp = PyObject_RichCompareBool(el, PyTuple_GET_ITEM(a, i),\r
                                           Py_EQ);\r
    return cmp;\r
}\r
\r
static PyObject *\r
tupleitem(register PyTupleObject *a, register Py_ssize_t i)\r
{\r
    if (i < 0 || i >= Py_SIZE(a)) {\r
        PyErr_SetString(PyExc_IndexError, "tuple index out of range");\r
        return NULL;\r
    }\r
    Py_INCREF(a->ob_item[i]);\r
    return a->ob_item[i];\r
}\r
\r
static PyObject *\r
tupleslice(register PyTupleObject *a, register Py_ssize_t ilow,\r
           register Py_ssize_t ihigh)\r
{\r
    register PyTupleObject *np;\r
    PyObject **src, **dest;\r
    register Py_ssize_t i;\r
    Py_ssize_t len;\r
    if (ilow < 0)\r
        ilow = 0;\r
    if (ihigh > Py_SIZE(a))\r
        ihigh = Py_SIZE(a);\r
    if (ihigh < ilow)\r
        ihigh = ilow;\r
    if (ilow == 0 && ihigh == Py_SIZE(a) && PyTuple_CheckExact(a)) {\r
        Py_INCREF(a);\r
        return (PyObject *)a;\r
    }\r
    len = ihigh - ilow;\r
    np = (PyTupleObject *)PyTuple_New(len);\r
    if (np == NULL)\r
        return NULL;\r
    src = a->ob_item + ilow;\r
    dest = np->ob_item;\r
    for (i = 0; i < len; i++) {\r
        PyObject *v = src[i];\r
        Py_INCREF(v);\r
        dest[i] = v;\r
    }\r
    return (PyObject *)np;\r
}\r
\r
PyObject *\r
PyTuple_GetSlice(PyObject *op, Py_ssize_t i, Py_ssize_t j)\r
{\r
    if (op == NULL || !PyTuple_Check(op)) {\r
        PyErr_BadInternalCall();\r
        return NULL;\r
    }\r
    return tupleslice((PyTupleObject *)op, i, j);\r
}\r
\r
static PyObject *\r
tupleconcat(register PyTupleObject *a, register PyObject *bb)\r
{\r
    register Py_ssize_t size;\r
    register Py_ssize_t i;\r
    PyObject **src, **dest;\r
    PyTupleObject *np;\r
    if (!PyTuple_Check(bb)) {\r
        PyErr_Format(PyExc_TypeError,\r
             "can only concatenate tuple (not \"%.200s\") to tuple",\r
                 Py_TYPE(bb)->tp_name);\r
        return NULL;\r
    }\r
#define b ((PyTupleObject *)bb)\r
    size = Py_SIZE(a) + Py_SIZE(b);\r
    if (size < 0)\r
        return PyErr_NoMemory();\r
    np = (PyTupleObject *) PyTuple_New(size);\r
    if (np == NULL) {\r
        return NULL;\r
    }\r
    src = a->ob_item;\r
    dest = np->ob_item;\r
    for (i = 0; i < Py_SIZE(a); i++) {\r
        PyObject *v = src[i];\r
        Py_INCREF(v);\r
        dest[i] = v;\r
    }\r
    src = b->ob_item;\r
    dest = np->ob_item + Py_SIZE(a);\r
    for (i = 0; i < Py_SIZE(b); i++) {\r
        PyObject *v = src[i];\r
        Py_INCREF(v);\r
        dest[i] = v;\r
    }\r
    return (PyObject *)np;\r
#undef b\r
}\r
\r
static PyObject *\r
tuplerepeat(PyTupleObject *a, Py_ssize_t n)\r
{\r
    Py_ssize_t i, j;\r
    Py_ssize_t size;\r
    PyTupleObject *np;\r
    PyObject **p, **items;\r
    if (n < 0)\r
        n = 0;\r
    if (Py_SIZE(a) == 0 || n == 1) {\r
        if (PyTuple_CheckExact(a)) {\r
            /* Since tuples are immutable, we can return a shared\r
               copy in this case */\r
            Py_INCREF(a);\r
            return (PyObject *)a;\r
        }\r
        if (Py_SIZE(a) == 0)\r
            return PyTuple_New(0);\r
    }\r
    size = Py_SIZE(a) * n;\r
    if (size/Py_SIZE(a) != n)\r
        return PyErr_NoMemory();\r
    np = (PyTupleObject *) PyTuple_New(size);\r
    if (np == NULL)\r
        return NULL;\r
    p = np->ob_item;\r
    items = a->ob_item;\r
    for (i = 0; i < n; i++) {\r
        for (j = 0; j < Py_SIZE(a); j++) {\r
            *p = items[j];\r
            Py_INCREF(*p);\r
            p++;\r
        }\r
    }\r
    return (PyObject *) np;\r
}\r
\r
static PyObject *\r
tupleindex(PyTupleObject *self, PyObject *args)\r
{\r
    Py_ssize_t i, start=0, stop=Py_SIZE(self);\r
    PyObject *v;\r
\r
    if (!PyArg_ParseTuple(args, "O|O&O&:index", &v,\r
                                _PyEval_SliceIndex, &start,\r
                                _PyEval_SliceIndex, &stop))\r
        return NULL;\r
    if (start < 0) {\r
        start += Py_SIZE(self);\r
        if (start < 0)\r
            start = 0;\r
    }\r
    if (stop < 0) {\r
        stop += Py_SIZE(self);\r
        if (stop < 0)\r
            stop = 0;\r
    }\r
    for (i = start; i < stop && i < Py_SIZE(self); i++) {\r
        int cmp = PyObject_RichCompareBool(self->ob_item[i], v, Py_EQ);\r
        if (cmp > 0)\r
            return PyInt_FromSsize_t(i);\r
        else if (cmp < 0)\r
            return NULL;\r
    }\r
    PyErr_SetString(PyExc_ValueError, "tuple.index(x): x not in tuple");\r
    return NULL;\r
}\r
\r
static PyObject *\r
tuplecount(PyTupleObject *self, PyObject *v)\r
{\r
    Py_ssize_t count = 0;\r
    Py_ssize_t i;\r
\r
    for (i = 0; i < Py_SIZE(self); i++) {\r
        int cmp = PyObject_RichCompareBool(self->ob_item[i], v, Py_EQ);\r
        if (cmp > 0)\r
            count++;\r
        else if (cmp < 0)\r
            return NULL;\r
    }\r
    return PyInt_FromSsize_t(count);\r
}\r
\r
static int\r
tupletraverse(PyTupleObject *o, visitproc visit, void *arg)\r
{\r
    Py_ssize_t i;\r
\r
    for (i = Py_SIZE(o); --i >= 0; )\r
        Py_VISIT(o->ob_item[i]);\r
    return 0;\r
}\r
\r
static PyObject *\r
tuplerichcompare(PyObject *v, PyObject *w, int op)\r
{\r
    PyTupleObject *vt, *wt;\r
    Py_ssize_t i;\r
    Py_ssize_t vlen, wlen;\r
\r
    if (!PyTuple_Check(v) || !PyTuple_Check(w)) {\r
        Py_INCREF(Py_NotImplemented);\r
        return Py_NotImplemented;\r
    }\r
\r
    vt = (PyTupleObject *)v;\r
    wt = (PyTupleObject *)w;\r
\r
    vlen = Py_SIZE(vt);\r
    wlen = Py_SIZE(wt);\r
\r
    /* Note:  the corresponding code for lists has an "early out" test\r
     * here when op is EQ or NE and the lengths differ.  That pays there,\r
     * but Tim was unable to find any real code where EQ/NE tuple\r
     * compares don't have the same length, so testing for it here would\r
     * have cost without benefit.\r
     */\r
\r
    /* Search for the first index where items are different.\r
     * Note that because tuples are immutable, it's safe to reuse\r
     * vlen and wlen across the comparison calls.\r
     */\r
    for (i = 0; i < vlen && i < wlen; i++) {\r
        int k = PyObject_RichCompareBool(vt->ob_item[i],\r
                                         wt->ob_item[i], Py_EQ);\r
        if (k < 0)\r
            return NULL;\r
        if (!k)\r
            break;\r
    }\r
\r
    if (i >= vlen || i >= wlen) {\r
        /* No more items to compare -- compare sizes */\r
        int cmp;\r
        PyObject *res;\r
        switch (op) {\r
        case Py_LT: cmp = vlen <  wlen; break;\r
        case Py_LE: cmp = vlen <= wlen; break;\r
        case Py_EQ: cmp = vlen == wlen; break;\r
        case Py_NE: cmp = vlen != wlen; break;\r
        case Py_GT: cmp = vlen >  wlen; break;\r
        case Py_GE: cmp = vlen >= wlen; break;\r
        default: return NULL; /* cannot happen */\r
        }\r
        if (cmp)\r
            res = Py_True;\r
        else\r
            res = Py_False;\r
        Py_INCREF(res);\r
        return res;\r
    }\r
\r
    /* We have an item that differs -- shortcuts for EQ/NE */\r
    if (op == Py_EQ) {\r
        Py_INCREF(Py_False);\r
        return Py_False;\r
    }\r
    if (op == Py_NE) {\r
        Py_INCREF(Py_True);\r
        return Py_True;\r
    }\r
\r
    /* Compare the final item again using the proper operator */\r
    return PyObject_RichCompare(vt->ob_item[i], wt->ob_item[i], op);\r
}\r
\r
static PyObject *\r
tuple_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds);\r
\r
static PyObject *\r
tuple_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\r
{\r
    PyObject *arg = NULL;\r
    static char *kwlist[] = {"sequence", 0};\r
\r
    if (type != &PyTuple_Type)\r
        return tuple_subtype_new(type, args, kwds);\r
    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:tuple", kwlist, &arg))\r
        return NULL;\r
\r
    if (arg == NULL)\r
        return PyTuple_New(0);\r
    else\r
        return PySequence_Tuple(arg);\r
}\r
\r
static PyObject *\r
tuple_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)\r
{\r
    PyObject *tmp, *newobj, *item;\r
    Py_ssize_t i, n;\r
\r
    assert(PyType_IsSubtype(type, &PyTuple_Type));\r
    tmp = tuple_new(&PyTuple_Type, args, kwds);\r
    if (tmp == NULL)\r
        return NULL;\r
    assert(PyTuple_Check(tmp));\r
    newobj = type->tp_alloc(type, n = PyTuple_GET_SIZE(tmp));\r
    if (newobj == NULL)\r
        return NULL;\r
    for (i = 0; i < n; i++) {\r
        item = PyTuple_GET_ITEM(tmp, i);\r
        Py_INCREF(item);\r
        PyTuple_SET_ITEM(newobj, i, item);\r
    }\r
    Py_DECREF(tmp);\r
    return newobj;\r
}\r
\r
PyDoc_STRVAR(tuple_doc,\r
"tuple() -> empty tuple\n\\r
tuple(iterable) -> tuple initialized from iterable's items\n\\r
\n\\r
If the argument is a tuple, the return value is the same object.");\r
\r
static PySequenceMethods tuple_as_sequence = {\r
    (lenfunc)tuplelength,                       /* sq_length */\r
    (binaryfunc)tupleconcat,                    /* sq_concat */\r
    (ssizeargfunc)tuplerepeat,                  /* sq_repeat */\r
    (ssizeargfunc)tupleitem,                    /* sq_item */\r
    (ssizessizeargfunc)tupleslice,              /* sq_slice */\r
    0,                                          /* sq_ass_item */\r
    0,                                          /* sq_ass_slice */\r
    (objobjproc)tuplecontains,                  /* sq_contains */\r
};\r
\r
static PyObject*\r
tuplesubscript(PyTupleObject* self, PyObject* item)\r
{\r
    if (PyIndex_Check(item)) {\r
        Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);\r
        if (i == -1 && PyErr_Occurred())\r
            return NULL;\r
        if (i < 0)\r
            i += PyTuple_GET_SIZE(self);\r
        return tupleitem(self, i);\r
    }\r
    else if (PySlice_Check(item)) {\r
        Py_ssize_t start, stop, step, slicelength, cur, i;\r
        PyObject* result;\r
        PyObject* it;\r
        PyObject **src, **dest;\r
\r
        if (PySlice_GetIndicesEx((PySliceObject*)item,\r
                         PyTuple_GET_SIZE(self),\r
                         &start, &stop, &step, &slicelength) < 0) {\r
            return NULL;\r
        }\r
\r
        if (slicelength <= 0) {\r
            return PyTuple_New(0);\r
        }\r
        else if (start == 0 && step == 1 &&\r
                 slicelength == PyTuple_GET_SIZE(self) &&\r
                 PyTuple_CheckExact(self)) {\r
            Py_INCREF(self);\r
            return (PyObject *)self;\r
        }\r
        else {\r
            result = PyTuple_New(slicelength);\r
            if (!result) return NULL;\r
\r
            src = self->ob_item;\r
            dest = ((PyTupleObject *)result)->ob_item;\r
            for (cur = start, i = 0; i < slicelength;\r
                 cur += step, i++) {\r
                it = src[cur];\r
                Py_INCREF(it);\r
                dest[i] = it;\r
            }\r
\r
            return result;\r
        }\r
    }\r
    else {\r
        PyErr_Format(PyExc_TypeError,\r
                     "tuple indices must be integers, not %.200s",\r
                     Py_TYPE(item)->tp_name);\r
        return NULL;\r
    }\r
}\r
\r
static PyObject *\r
tuple_getnewargs(PyTupleObject *v)\r
{\r
    return Py_BuildValue("(N)", tupleslice(v, 0, Py_SIZE(v)));\r
\r
}\r
\r
PyDoc_STRVAR(index_doc,\r
"T.index(value, [start, [stop]]) -> integer -- return first index of value.\n"\r
"Raises ValueError if the value is not present."\r
);\r
PyDoc_STRVAR(count_doc,\r
"T.count(value) -> integer -- return number of occurrences of value");\r
\r
static PyMethodDef tuple_methods[] = {\r
    {"__getnewargs__",          (PyCFunction)tuple_getnewargs,  METH_NOARGS},\r
    {"index",           (PyCFunction)tupleindex,  METH_VARARGS, index_doc},\r
    {"count",           (PyCFunction)tuplecount,  METH_O, count_doc},\r
    {NULL,              NULL}           /* sentinel */\r
};\r
\r
static PyMappingMethods tuple_as_mapping = {\r
    (lenfunc)tuplelength,\r
    (binaryfunc)tuplesubscript,\r
    0\r
};\r
\r
static PyObject *tuple_iter(PyObject *seq);\r
\r
PyTypeObject PyTuple_Type = {\r
    PyVarObject_HEAD_INIT(&PyType_Type, 0)\r
    "tuple",\r
    sizeof(PyTupleObject) - sizeof(PyObject *),\r
    sizeof(PyObject *),\r
    (destructor)tupledealloc,                   /* tp_dealloc */\r
    (printfunc)tupleprint,                      /* tp_print */\r
    0,                                          /* tp_getattr */\r
    0,                                          /* tp_setattr */\r
    0,                                          /* tp_compare */\r
    (reprfunc)tuplerepr,                        /* tp_repr */\r
    0,                                          /* tp_as_number */\r
    &tuple_as_sequence,                         /* tp_as_sequence */\r
    &tuple_as_mapping,                          /* tp_as_mapping */\r
    (hashfunc)tuplehash,                        /* tp_hash */\r
    0,                                          /* tp_call */\r
    0,                                          /* tp_str */\r
    PyObject_GenericGetAttr,                    /* tp_getattro */\r
    0,                                          /* tp_setattro */\r
    0,                                          /* tp_as_buffer */\r
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |\r
        Py_TPFLAGS_BASETYPE | Py_TPFLAGS_TUPLE_SUBCLASS, /* tp_flags */\r
    tuple_doc,                                  /* tp_doc */\r
    (traverseproc)tupletraverse,                /* tp_traverse */\r
    0,                                          /* tp_clear */\r
    tuplerichcompare,                           /* tp_richcompare */\r
    0,                                          /* tp_weaklistoffset */\r
    tuple_iter,                                 /* tp_iter */\r
    0,                                          /* tp_iternext */\r
    tuple_methods,                              /* tp_methods */\r
    0,                                          /* tp_members */\r
    0,                                          /* tp_getset */\r
    0,                                          /* tp_base */\r
    0,                                          /* tp_dict */\r
    0,                                          /* tp_descr_get */\r
    0,                                          /* tp_descr_set */\r
    0,                                          /* tp_dictoffset */\r
    0,                                          /* tp_init */\r
    0,                                          /* tp_alloc */\r
    tuple_new,                                  /* tp_new */\r
    PyObject_GC_Del,                            /* tp_free */\r
};\r
\r
/* The following function breaks the notion that tuples are immutable:\r
   it changes the size of a tuple.  We get away with this only if there\r
   is only one module referencing the object.  You can also think of it\r
   as creating a new tuple object and destroying the old one, only more\r
   efficiently.  In any case, don't use this if the tuple may already be\r
   known to some other part of the code. */\r
\r
int\r
_PyTuple_Resize(PyObject **pv, Py_ssize_t newsize)\r
{\r
    register PyTupleObject *v;\r
    register PyTupleObject *sv;\r
    Py_ssize_t i;\r
    Py_ssize_t oldsize;\r
\r
    v = (PyTupleObject *) *pv;\r
    if (v == NULL || Py_TYPE(v) != &PyTuple_Type ||\r
        (Py_SIZE(v) != 0 && Py_REFCNT(v) != 1)) {\r
        *pv = 0;\r
        Py_XDECREF(v);\r
        PyErr_BadInternalCall();\r
        return -1;\r
    }\r
    oldsize = Py_SIZE(v);\r
    if (oldsize == newsize)\r
        return 0;\r
\r
    if (oldsize == 0) {\r
        /* Empty tuples are often shared, so we should never\r
           resize them in-place even if we do own the only\r
           (current) reference */\r
        Py_DECREF(v);\r
        *pv = PyTuple_New(newsize);\r
        return *pv == NULL ? -1 : 0;\r
    }\r
\r
    /* XXX UNREF/NEWREF interface should be more symmetrical */\r
    _Py_DEC_REFTOTAL;\r
    if (_PyObject_GC_IS_TRACKED(v))\r
        _PyObject_GC_UNTRACK(v);\r
    _Py_ForgetReference((PyObject *) v);\r
    /* DECREF items deleted by shrinkage */\r
    for (i = newsize; i < oldsize; i++) {\r
        Py_CLEAR(v->ob_item[i]);\r
    }\r
    sv = PyObject_GC_Resize(PyTupleObject, v, newsize);\r
    if (sv == NULL) {\r
        *pv = NULL;\r
        PyObject_GC_Del(v);\r
        return -1;\r
    }\r
    _Py_NewReference((PyObject *) sv);\r
    /* Zero out items added by growing */\r
    if (newsize > oldsize)\r
        memset(&sv->ob_item[oldsize], 0,\r
               sizeof(*sv->ob_item) * (newsize - oldsize));\r
    *pv = (PyObject *) sv;\r
    _PyObject_GC_TRACK(sv);\r
    return 0;\r
}\r
\r
int\r
PyTuple_ClearFreeList(void)\r
{\r
    int freelist_size = 0;\r
#if PyTuple_MAXSAVESIZE > 0\r
    int i;\r
    for (i = 1; i < PyTuple_MAXSAVESIZE; i++) {\r
        PyTupleObject *p, *q;\r
        p = free_list[i];\r
        freelist_size += numfree[i];\r
        free_list[i] = NULL;\r
        numfree[i] = 0;\r
        while (p) {\r
            q = p;\r
            p = (PyTupleObject *)(p->ob_item[0]);\r
            PyObject_GC_Del(q);\r
        }\r
    }\r
#endif\r
    return freelist_size;\r
}\r
\r
void\r
PyTuple_Fini(void)\r
{\r
#if PyTuple_MAXSAVESIZE > 0\r
    /* empty tuples are used all over the place and applications may\r
     * rely on the fact that an empty tuple is a singleton. */\r
    Py_CLEAR(free_list[0]);\r
\r
    (void)PyTuple_ClearFreeList();\r
#endif\r
#ifdef SHOW_TRACK_COUNT\r
    show_track();\r
#endif\r
}\r
\r
/*********************** Tuple Iterator **************************/\r
\r
typedef struct {\r
    PyObject_HEAD\r
    long it_index;\r
    PyTupleObject *it_seq; /* Set to NULL when iterator is exhausted */\r
} tupleiterobject;\r
\r
static void\r
tupleiter_dealloc(tupleiterobject *it)\r
{\r
    _PyObject_GC_UNTRACK(it);\r
    Py_XDECREF(it->it_seq);\r
    PyObject_GC_Del(it);\r
}\r
\r
static int\r
tupleiter_traverse(tupleiterobject *it, visitproc visit, void *arg)\r
{\r
    Py_VISIT(it->it_seq);\r
    return 0;\r
}\r
\r
static PyObject *\r
tupleiter_next(tupleiterobject *it)\r
{\r
    PyTupleObject *seq;\r
    PyObject *item;\r
\r
    assert(it != NULL);\r
    seq = it->it_seq;\r
    if (seq == NULL)\r
        return NULL;\r
    assert(PyTuple_Check(seq));\r
\r
    if (it->it_index < PyTuple_GET_SIZE(seq)) {\r
        item = PyTuple_GET_ITEM(seq, it->it_index);\r
        ++it->it_index;\r
        Py_INCREF(item);\r
        return item;\r
    }\r
\r
    Py_DECREF(seq);\r
    it->it_seq = NULL;\r
    return NULL;\r
}\r
\r
static PyObject *\r
tupleiter_len(tupleiterobject *it)\r
{\r
    Py_ssize_t len = 0;\r
    if (it->it_seq)\r
        len = PyTuple_GET_SIZE(it->it_seq) - it->it_index;\r
    return PyInt_FromSsize_t(len);\r
}\r
\r
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");\r
\r
static PyMethodDef tupleiter_methods[] = {\r
    {"__length_hint__", (PyCFunction)tupleiter_len, METH_NOARGS, length_hint_doc},\r
    {NULL,              NULL}           /* sentinel */\r
};\r
\r
PyTypeObject PyTupleIter_Type = {\r
    PyVarObject_HEAD_INIT(&PyType_Type, 0)\r
    "tupleiterator",                            /* tp_name */\r
    sizeof(tupleiterobject),                    /* tp_basicsize */\r
    0,                                          /* tp_itemsize */\r
    /* methods */\r
    (destructor)tupleiter_dealloc,              /* tp_dealloc */\r
    0,                                          /* tp_print */\r
    0,                                          /* tp_getattr */\r
    0,                                          /* tp_setattr */\r
    0,                                          /* tp_compare */\r
    0,                                          /* tp_repr */\r
    0,                                          /* tp_as_number */\r
    0,                                          /* tp_as_sequence */\r
    0,                                          /* tp_as_mapping */\r
    0,                                          /* tp_hash */\r
    0,                                          /* tp_call */\r
    0,                                          /* tp_str */\r
    PyObject_GenericGetAttr,                    /* tp_getattro */\r
    0,                                          /* tp_setattro */\r
    0,                                          /* tp_as_buffer */\r
    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */\r
    0,                                          /* tp_doc */\r
    (traverseproc)tupleiter_traverse,           /* tp_traverse */\r
    0,                                          /* tp_clear */\r
    0,                                          /* tp_richcompare */\r
    0,                                          /* tp_weaklistoffset */\r
    PyObject_SelfIter,                          /* tp_iter */\r
    (iternextfunc)tupleiter_next,               /* tp_iternext */\r
    tupleiter_methods,                          /* tp_methods */\r
    0,\r
};\r
\r
static PyObject *\r
tuple_iter(PyObject *seq)\r
{\r
    tupleiterobject *it;\r
\r
    if (!PyTuple_Check(seq)) {\r
        PyErr_BadInternalCall();\r
        return NULL;\r
    }\r
    it = PyObject_GC_New(tupleiterobject, &PyTupleIter_Type);\r
    if (it == NULL)\r
        return NULL;\r
    it->it_index = 0;\r
    Py_INCREF(seq);\r
    it->it_seq = (PyTupleObject *)seq;\r
    _PyObject_GC_TRACK(it);\r
    return (PyObject *)it;\r
}\r