mirror of
https://github.com/python/cpython.git
synced 2024-11-30 05:15:14 +08:00
f70590f990
out the for loop at the end intended to zero out new items wasn't doing anything, because sv->ob_size was already equal to newsize. The fix slightly refactors the function, introducing a variable oldsize and doing away with sizediff (which was used only once), and using oldsize and newsize consistently. I also added comments explaining what the two for loops do. (Looking at the CVS annotation of this function, it's no miracle a bug crept in -- this has been patched by many different folks! :-)
671 lines
15 KiB
C
671 lines
15 KiB
C
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/* Tuple object implementation */
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#include "Python.h"
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/* Speed optimization to avoid frequent malloc/free of small tuples */
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#ifndef MAXSAVESIZE
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#define MAXSAVESIZE 20 /* Largest tuple to save on free list */
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#endif
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#ifndef MAXSAVEDTUPLES
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#define MAXSAVEDTUPLES 2000 /* Maximum number of tuples of each size to save */
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#endif
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#if MAXSAVESIZE > 0
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/* Entries 1 up to MAXSAVESIZE are free lists, entry 0 is the empty
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tuple () of which at most one instance will be allocated.
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*/
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static PyTupleObject *free_tuples[MAXSAVESIZE];
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static int num_free_tuples[MAXSAVESIZE];
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#endif
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#ifdef COUNT_ALLOCS
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int fast_tuple_allocs;
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int tuple_zero_allocs;
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#endif
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PyObject *
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PyTuple_New(register int size)
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{
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register int i;
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register PyTupleObject *op;
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if (size < 0) {
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PyErr_BadInternalCall();
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return NULL;
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}
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#if MAXSAVESIZE > 0
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if (size == 0 && free_tuples[0]) {
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op = free_tuples[0];
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Py_INCREF(op);
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#ifdef COUNT_ALLOCS
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tuple_zero_allocs++;
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#endif
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return (PyObject *) op;
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}
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if (0 < size && size < MAXSAVESIZE &&
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(op = free_tuples[size]) != NULL)
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{
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free_tuples[size] = (PyTupleObject *) op->ob_item[0];
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num_free_tuples[size]--;
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#ifdef COUNT_ALLOCS
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fast_tuple_allocs++;
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#endif
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/* PyObject_InitVar is inlined */
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#ifdef Py_TRACE_REFS
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op->ob_size = size;
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op->ob_type = &PyTuple_Type;
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#endif
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_Py_NewReference((PyObject *)op);
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}
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else
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#endif
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{
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int nbytes = size * sizeof(PyObject *);
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/* Check for overflow */
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if (nbytes / sizeof(PyObject *) != (size_t)size ||
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(nbytes += sizeof(PyTupleObject) - sizeof(PyObject *))
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<= 0)
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{
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return PyErr_NoMemory();
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}
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op = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size);
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if (op == NULL)
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return NULL;
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}
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for (i = 0; i < size; i++)
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op->ob_item[i] = NULL;
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#if MAXSAVESIZE > 0
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if (size == 0) {
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free_tuples[0] = op;
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++num_free_tuples[0];
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Py_INCREF(op); /* extra INCREF so that this is never freed */
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}
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#endif
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_PyObject_GC_TRACK(op);
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return (PyObject *) op;
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}
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int
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PyTuple_Size(register PyObject *op)
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{
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if (!PyTuple_Check(op)) {
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PyErr_BadInternalCall();
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return -1;
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}
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else
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return ((PyTupleObject *)op)->ob_size;
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}
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PyObject *
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PyTuple_GetItem(register PyObject *op, register int i)
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{
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if (!PyTuple_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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if (i < 0 || i >= ((PyTupleObject *)op) -> ob_size) {
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PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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return NULL;
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}
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return ((PyTupleObject *)op) -> ob_item[i];
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}
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int
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PyTuple_SetItem(register PyObject *op, register int i, PyObject *newitem)
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{
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register PyObject *olditem;
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register PyObject **p;
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if (!PyTuple_Check(op) || op->ob_refcnt != 1) {
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Py_XDECREF(newitem);
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PyErr_BadInternalCall();
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return -1;
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}
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if (i < 0 || i >= ((PyTupleObject *)op) -> ob_size) {
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Py_XDECREF(newitem);
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PyErr_SetString(PyExc_IndexError,
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"tuple assignment index out of range");
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return -1;
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}
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p = ((PyTupleObject *)op) -> ob_item + i;
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olditem = *p;
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*p = newitem;
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Py_XDECREF(olditem);
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return 0;
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}
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/* Methods */
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static void
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tupledealloc(register PyTupleObject *op)
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{
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register int i;
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register int len = op->ob_size;
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Py_TRASHCAN_SAFE_BEGIN(op)
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_PyObject_GC_UNTRACK(op);
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if (len > 0) {
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i = len;
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while (--i >= 0)
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Py_XDECREF(op->ob_item[i]);
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#if MAXSAVESIZE > 0
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if (len < MAXSAVESIZE &&
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num_free_tuples[len] < MAXSAVEDTUPLES &&
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op->ob_type == &PyTuple_Type)
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{
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op->ob_item[0] = (PyObject *) free_tuples[len];
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num_free_tuples[len]++;
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free_tuples[len] = op;
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goto done; /* return */
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}
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#endif
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}
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op->ob_type->tp_free((PyObject *)op);
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done:
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Py_TRASHCAN_SAFE_END(op)
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}
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static int
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tupleprint(PyTupleObject *op, FILE *fp, int flags)
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{
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int i;
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fprintf(fp, "(");
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for (i = 0; i < op->ob_size; i++) {
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if (i > 0)
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fprintf(fp, ", ");
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if (PyObject_Print(op->ob_item[i], fp, 0) != 0)
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return -1;
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}
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if (op->ob_size == 1)
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fprintf(fp, ",");
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fprintf(fp, ")");
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return 0;
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}
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static PyObject *
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tuplerepr(PyTupleObject *v)
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{
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int i, n;
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PyObject *s, *temp;
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PyObject *pieces, *result = NULL;
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n = v->ob_size;
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if (n == 0)
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return PyString_FromString("()");
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pieces = PyTuple_New(n);
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if (pieces == NULL)
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return NULL;
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/* Do repr() on each element. */
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for (i = 0; i < n; ++i) {
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s = PyObject_Repr(v->ob_item[i]);
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if (s == NULL)
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goto Done;
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PyTuple_SET_ITEM(pieces, i, s);
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}
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/* Add "()" decorations to the first and last items. */
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assert(n > 0);
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s = PyString_FromString("(");
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if (s == NULL)
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goto Done;
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temp = PyTuple_GET_ITEM(pieces, 0);
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PyString_ConcatAndDel(&s, temp);
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PyTuple_SET_ITEM(pieces, 0, s);
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if (s == NULL)
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goto Done;
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s = PyString_FromString(n == 1 ? ",)" : ")");
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if (s == NULL)
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goto Done;
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temp = PyTuple_GET_ITEM(pieces, n-1);
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PyString_ConcatAndDel(&temp, s);
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PyTuple_SET_ITEM(pieces, n-1, temp);
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if (temp == NULL)
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goto Done;
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/* Paste them all together with ", " between. */
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s = PyString_FromString(", ");
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if (s == NULL)
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goto Done;
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result = _PyString_Join(s, pieces);
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Py_DECREF(s);
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Done:
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Py_DECREF(pieces);
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return result;
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}
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static long
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tuplehash(PyTupleObject *v)
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{
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register long x, y;
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register int len = v->ob_size;
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register PyObject **p;
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x = 0x345678L;
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p = v->ob_item;
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while (--len >= 0) {
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y = PyObject_Hash(*p++);
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if (y == -1)
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return -1;
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x = (1000003*x) ^ y;
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}
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x ^= v->ob_size;
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if (x == -1)
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x = -2;
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return x;
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}
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static int
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tuplelength(PyTupleObject *a)
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{
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return a->ob_size;
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}
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static int
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tuplecontains(PyTupleObject *a, PyObject *el)
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{
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int i, cmp;
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for (i = 0; i < a->ob_size; ++i) {
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cmp = PyObject_RichCompareBool(el, PyTuple_GET_ITEM(a, i),
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Py_EQ);
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if (cmp > 0)
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return 1;
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else if (cmp < 0)
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return -1;
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}
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return 0;
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}
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static PyObject *
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tupleitem(register PyTupleObject *a, register int i)
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{
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if (i < 0 || i >= a->ob_size) {
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PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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return NULL;
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}
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Py_INCREF(a->ob_item[i]);
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return a->ob_item[i];
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}
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static PyObject *
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tupleslice(register PyTupleObject *a, register int ilow, register int ihigh)
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{
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register PyTupleObject *np;
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register int i;
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if (ilow < 0)
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ilow = 0;
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if (ihigh > a->ob_size)
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ihigh = a->ob_size;
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if (ihigh < ilow)
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ihigh = ilow;
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if (ilow == 0 && ihigh == a->ob_size && PyTuple_CheckExact(a)) {
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Py_INCREF(a);
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return (PyObject *)a;
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}
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np = (PyTupleObject *)PyTuple_New(ihigh - ilow);
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if (np == NULL)
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return NULL;
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for (i = ilow; i < ihigh; i++) {
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PyObject *v = a->ob_item[i];
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Py_INCREF(v);
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np->ob_item[i - ilow] = v;
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}
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return (PyObject *)np;
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}
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PyObject *
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PyTuple_GetSlice(PyObject *op, int i, int j)
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{
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if (op == NULL || !PyTuple_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return tupleslice((PyTupleObject *)op, i, j);
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}
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static PyObject *
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tupleconcat(register PyTupleObject *a, register PyObject *bb)
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{
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register int size;
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register int i;
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PyTupleObject *np;
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if (!PyTuple_Check(bb)) {
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PyErr_Format(PyExc_TypeError,
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"can only concatenate tuple (not \"%.200s\") to tuple",
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bb->ob_type->tp_name);
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return NULL;
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}
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#define b ((PyTupleObject *)bb)
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size = a->ob_size + b->ob_size;
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np = (PyTupleObject *) PyTuple_New(size);
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if (np == NULL) {
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return NULL;
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}
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for (i = 0; i < a->ob_size; i++) {
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PyObject *v = a->ob_item[i];
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Py_INCREF(v);
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np->ob_item[i] = v;
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}
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for (i = 0; i < b->ob_size; i++) {
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PyObject *v = b->ob_item[i];
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Py_INCREF(v);
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np->ob_item[i + a->ob_size] = v;
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}
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return (PyObject *)np;
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#undef b
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}
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static PyObject *
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tuplerepeat(PyTupleObject *a, int n)
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{
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int i, j;
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int size;
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PyTupleObject *np;
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PyObject **p;
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if (n < 0)
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n = 0;
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if (a->ob_size == 0 || n == 1) {
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if (PyTuple_CheckExact(a)) {
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/* Since tuples are immutable, we can return a shared
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copy in this case */
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Py_INCREF(a);
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return (PyObject *)a;
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}
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if (a->ob_size == 0)
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return PyTuple_New(0);
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}
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size = a->ob_size * n;
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if (size/a->ob_size != n)
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return PyErr_NoMemory();
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np = (PyTupleObject *) PyTuple_New(size);
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if (np == NULL)
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return NULL;
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p = np->ob_item;
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for (i = 0; i < n; i++) {
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for (j = 0; j < a->ob_size; j++) {
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*p = a->ob_item[j];
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Py_INCREF(*p);
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p++;
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}
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}
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return (PyObject *) np;
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}
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static int
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tupletraverse(PyTupleObject *o, visitproc visit, void *arg)
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{
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int i, err;
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PyObject *x;
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for (i = o->ob_size; --i >= 0; ) {
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x = o->ob_item[i];
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if (x != NULL) {
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err = visit(x, arg);
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if (err)
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return err;
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}
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}
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return 0;
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}
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static PyObject *
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tuplerichcompare(PyObject *v, PyObject *w, int op)
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{
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PyTupleObject *vt, *wt;
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int i;
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int vlen, wlen;
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if (!PyTuple_Check(v) || !PyTuple_Check(w)) {
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Py_INCREF(Py_NotImplemented);
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return Py_NotImplemented;
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}
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vt = (PyTupleObject *)v;
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wt = (PyTupleObject *)w;
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vlen = vt->ob_size;
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wlen = wt->ob_size;
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/* Note: the corresponding code for lists has an "early out" test
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* here when op is EQ or NE and the lengths differ. That pays there,
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* but Tim was unable to find any real code where EQ/NE tuple
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* compares don't have the same length, so testing for it here would
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* have cost without benefit.
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*/
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/* Search for the first index where items are different.
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* Note that because tuples are immutable, it's safe to reuse
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* vlen and wlen across the comparison calls.
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*/
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for (i = 0; i < vlen && i < wlen; i++) {
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int k = PyObject_RichCompareBool(vt->ob_item[i],
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wt->ob_item[i], Py_EQ);
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if (k < 0)
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return NULL;
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if (!k)
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break;
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}
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if (i >= vlen || i >= wlen) {
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/* No more items to compare -- compare sizes */
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int cmp;
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PyObject *res;
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switch (op) {
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case Py_LT: cmp = vlen < wlen; break;
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case Py_LE: cmp = vlen <= wlen; break;
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case Py_EQ: cmp = vlen == wlen; break;
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case Py_NE: cmp = vlen != wlen; break;
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case Py_GT: cmp = vlen > wlen; break;
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case Py_GE: cmp = vlen >= wlen; break;
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default: return NULL; /* cannot happen */
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}
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if (cmp)
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res = Py_True;
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else
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res = Py_False;
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Py_INCREF(res);
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return res;
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}
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/* We have an item that differs -- shortcuts for EQ/NE */
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if (op == Py_EQ) {
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Py_INCREF(Py_False);
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return Py_False;
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}
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if (op == Py_NE) {
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Py_INCREF(Py_True);
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return Py_True;
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}
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/* Compare the final item again using the proper operator */
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return PyObject_RichCompare(vt->ob_item[i], wt->ob_item[i], op);
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}
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staticforward PyObject *
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tuple_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
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static PyObject *
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tuple_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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{
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PyObject *arg = NULL;
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static char *kwlist[] = {"sequence", 0};
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if (type != &PyTuple_Type)
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return tuple_subtype_new(type, args, kwds);
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:tuple", kwlist, &arg))
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return NULL;
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if (arg == NULL)
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return PyTuple_New(0);
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else
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return PySequence_Tuple(arg);
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}
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static PyObject *
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tuple_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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{
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PyObject *tmp, *new, *item;
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int i, n;
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assert(PyType_IsSubtype(type, &PyTuple_Type));
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tmp = tuple_new(&PyTuple_Type, args, kwds);
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if (tmp == NULL)
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return NULL;
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assert(PyTuple_Check(tmp));
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new = type->tp_alloc(type, n = PyTuple_GET_SIZE(tmp));
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if (new == NULL)
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return NULL;
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for (i = 0; i < n; i++) {
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item = PyTuple_GET_ITEM(tmp, i);
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Py_INCREF(item);
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PyTuple_SET_ITEM(new, i, item);
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}
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Py_DECREF(tmp);
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return new;
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}
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|
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static char tuple_doc[] =
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"tuple() -> an empty tuple\n"
|
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"tuple(sequence) -> tuple initialized from sequence's items\n"
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"\n"
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|
"If the argument is a tuple, the return value is the same object.";
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|
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static PySequenceMethods tuple_as_sequence = {
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(inquiry)tuplelength, /* sq_length */
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(binaryfunc)tupleconcat, /* sq_concat */
|
|
(intargfunc)tuplerepeat, /* sq_repeat */
|
|
(intargfunc)tupleitem, /* sq_item */
|
|
(intintargfunc)tupleslice, /* sq_slice */
|
|
0, /* sq_ass_item */
|
|
0, /* sq_ass_slice */
|
|
(objobjproc)tuplecontains, /* sq_contains */
|
|
};
|
|
|
|
PyTypeObject PyTuple_Type = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0,
|
|
"tuple",
|
|
sizeof(PyTupleObject) - sizeof(PyObject *),
|
|
sizeof(PyObject *),
|
|
(destructor)tupledealloc, /* tp_dealloc */
|
|
(printfunc)tupleprint, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_compare */
|
|
(reprfunc)tuplerepr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
&tuple_as_sequence, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
(hashfunc)tuplehash, /* 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 */
|
|
tuple_doc, /* tp_doc */
|
|
(traverseproc)tupletraverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
tuplerichcompare, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* 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 */
|
|
tuple_new, /* tp_new */
|
|
_PyObject_GC_Del, /* tp_free */
|
|
};
|
|
|
|
/* The following function breaks the notion that tuples are immutable:
|
|
it changes the size of a tuple. We get away with this only if there
|
|
is only one module referencing the object. You can also think of it
|
|
as creating a new tuple object and destroying the old one, only more
|
|
efficiently. In any case, don't use this if the tuple may already be
|
|
known to some other part of the code. */
|
|
|
|
int
|
|
_PyTuple_Resize(PyObject **pv, int newsize)
|
|
{
|
|
register PyTupleObject *v;
|
|
register PyTupleObject *sv;
|
|
int i;
|
|
int oldsize;
|
|
|
|
v = (PyTupleObject *) *pv;
|
|
if (v == NULL || v->ob_type != &PyTuple_Type ||
|
|
(v->ob_size != 0 && v->ob_refcnt != 1)) {
|
|
*pv = 0;
|
|
Py_XDECREF(v);
|
|
PyErr_BadInternalCall();
|
|
return -1;
|
|
}
|
|
oldsize = v->ob_size;
|
|
if (oldsize == newsize)
|
|
return 0;
|
|
|
|
if (oldsize == 0) {
|
|
/* Empty tuples are often shared, so we should never
|
|
resize them in-place even if we do own the only
|
|
(current) reference */
|
|
Py_DECREF(v);
|
|
*pv = PyTuple_New(newsize);
|
|
return *pv == NULL ? -1 : 0;
|
|
}
|
|
|
|
/* XXX UNREF/NEWREF interface should be more symmetrical */
|
|
#ifdef Py_REF_DEBUG
|
|
--_Py_RefTotal;
|
|
#endif
|
|
_PyObject_GC_UNTRACK(v);
|
|
_Py_ForgetReference((PyObject *) v);
|
|
/* DECREF items deleted by shrinkage */
|
|
for (i = newsize; i < oldsize; i++) {
|
|
Py_XDECREF(v->ob_item[i]);
|
|
v->ob_item[i] = NULL;
|
|
}
|
|
sv = PyObject_GC_Resize(PyTupleObject, v, newsize);
|
|
if (sv == NULL) {
|
|
*pv = NULL;
|
|
PyObject_GC_Del(v);
|
|
return -1;
|
|
}
|
|
_Py_NewReference((PyObject *) sv);
|
|
/* Zero out items added by growing */
|
|
for (i = oldsize; i < newsize; i++)
|
|
sv->ob_item[i] = NULL;
|
|
*pv = (PyObject *) sv;
|
|
_PyObject_GC_TRACK(sv);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
PyTuple_Fini(void)
|
|
{
|
|
#if MAXSAVESIZE > 0
|
|
int i;
|
|
|
|
Py_XDECREF(free_tuples[0]);
|
|
free_tuples[0] = NULL;
|
|
|
|
for (i = 1; i < MAXSAVESIZE; i++) {
|
|
PyTupleObject *p, *q;
|
|
p = free_tuples[i];
|
|
free_tuples[i] = NULL;
|
|
while (p) {
|
|
q = p;
|
|
p = (PyTupleObject *)(p->ob_item[0]);
|
|
PyObject_GC_Del(q);
|
|
}
|
|
}
|
|
#endif
|
|
}
|