mirror of https://github.com/python/cpython
585 lines
13 KiB
C
585 lines
13 KiB
C
/***********************************************************
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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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(size)
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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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/* PyObject_NewVar is inlined */
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op = (PyTupleObject *) PyObject_MALLOC(nbytes);
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if (op == NULL)
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return PyErr_NoMemory();
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PyObject_INIT_VAR(op, &PyTuple_Type, size);
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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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return (PyObject *) op;
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}
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int
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PyTuple_Size(op)
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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(op, i)
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register PyObject *op;
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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(op, i, newitem)
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register PyObject *op;
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register int i;
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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(op)
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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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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 && num_free_tuples[len] < MAXSAVEDTUPLES) {
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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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PyObject_DEL(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(op, fp, flags)
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PyTupleObject *op;
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FILE *fp;
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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(v)
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PyTupleObject *v;
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{
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PyObject *s, *comma;
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int i;
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s = PyString_FromString("(");
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comma = PyString_FromString(", ");
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for (i = 0; i < v->ob_size && s != NULL; i++) {
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if (i > 0)
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PyString_Concat(&s, comma);
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PyString_ConcatAndDel(&s, PyObject_Repr(v->ob_item[i]));
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}
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Py_DECREF(comma);
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if (v->ob_size == 1)
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PyString_ConcatAndDel(&s, PyString_FromString(","));
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PyString_ConcatAndDel(&s, PyString_FromString(")"));
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return s;
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}
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static int
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tuplecompare(v, w)
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register PyTupleObject *v, *w;
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{
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register int len =
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(v->ob_size < w->ob_size) ? v->ob_size : w->ob_size;
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register int i;
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for (i = 0; i < len; i++) {
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int cmp = PyObject_Compare(v->ob_item[i], w->ob_item[i]);
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if (cmp != 0)
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return cmp;
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}
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return v->ob_size - w->ob_size;
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}
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static long
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tuplehash(v)
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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(a)
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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(a, el)
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PyTupleObject *a;
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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_Compare(el, PyTuple_GET_ITEM(a, i));
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if (cmp == 0)
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return 1;
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if (PyErr_Occurred())
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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(a, i)
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register PyTupleObject *a;
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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(a, ilow, ihigh)
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register PyTupleObject *a;
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register int ilow, 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) {
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/* XXX can only do this if tuples are immutable! */
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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(op, i, j)
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PyObject *op;
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int i, 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(a, bb)
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register PyTupleObject *a;
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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 append 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(a, n)
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PyTupleObject *a;
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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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/* 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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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 PySequenceMethods tuple_as_sequence = {
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(inquiry)tuplelength, /*sq_length*/
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(binaryfunc)tupleconcat, /*sq_concat*/
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(intargfunc)tuplerepeat, /*sq_repeat*/
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(intargfunc)tupleitem, /*sq_item*/
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(intintargfunc)tupleslice, /*sq_slice*/
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0, /*sq_ass_item*/
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0, /*sq_ass_slice*/
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(objobjproc)tuplecontains, /*sq_contains*/
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};
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PyTypeObject PyTuple_Type = {
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PyObject_HEAD_INIT(&PyType_Type)
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0,
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"tuple",
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sizeof(PyTupleObject) - sizeof(PyObject *),
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sizeof(PyObject *),
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(destructor)tupledealloc, /*tp_dealloc*/
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(printfunc)tupleprint, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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(cmpfunc)tuplecompare, /*tp_compare*/
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(reprfunc)tuplerepr, /*tp_repr*/
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0, /*tp_as_number*/
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&tuple_as_sequence, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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(hashfunc)tuplehash, /*tp_hash*/
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro*/
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT, /*tp_flags*/
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};
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/* The following function breaks the notion that tuples are immutable:
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it changes the size of a tuple. We get away with this only if there
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is only one module referencing the object. You can also think of it
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as creating a new tuple object and destroying the old one, only
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more efficiently. In any case, don't use this if the tuple may
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already be known to some other part of the code...
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If last_is_sticky is set, the tuple will grow or shrink at the
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front, otherwise it will grow or shrink at the end. */
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int
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_PyTuple_Resize(pv, newsize, last_is_sticky)
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PyObject **pv;
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int newsize;
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int last_is_sticky;
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{
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register PyTupleObject *v;
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register PyTupleObject *sv;
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int i;
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int sizediff;
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v = (PyTupleObject *) *pv;
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if (v == NULL || !PyTuple_Check(v) || v->ob_refcnt != 1) {
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*pv = 0;
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Py_DECREF(v);
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PyErr_BadInternalCall();
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return -1;
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}
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sizediff = newsize - v->ob_size;
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if (sizediff == 0)
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return 0;
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/* XXX UNREF/NEWREF interface should be more symmetrical */
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#ifdef Py_REF_DEBUG
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--_Py_RefTotal;
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#endif
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_Py_ForgetReference((PyObject *)v);
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if (last_is_sticky && sizediff < 0) {
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/* shrinking:
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move entries to the front and zero moved entries */
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for (i = 0; i < newsize; i++) {
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Py_XDECREF(v->ob_item[i]);
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v->ob_item[i] = v->ob_item[i - sizediff];
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v->ob_item[i - sizediff] = NULL;
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}
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}
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for (i = newsize; i < v->ob_size; i++) {
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Py_XDECREF(v->ob_item[i]);
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v->ob_item[i] = NULL;
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}
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#if MAXSAVESIZE > 0
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if (newsize == 0 && free_tuples[0]) {
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num_free_tuples[0]--;
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sv = free_tuples[0];
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sv->ob_size = 0;
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Py_INCREF(sv);
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#ifdef COUNT_ALLOCS
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tuple_zero_allocs++;
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#endif
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tupledealloc(v);
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*pv = (PyObject*) sv;
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return 0;
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}
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if (0 < newsize && newsize < MAXSAVESIZE &&
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(sv = free_tuples[newsize]) != NULL)
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{
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free_tuples[newsize] = (PyTupleObject *) sv->ob_item[0];
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num_free_tuples[newsize]--;
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#ifdef COUNT_ALLOCS
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fast_tuple_allocs++;
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#endif
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#ifdef Py_TRACE_REFS
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sv->ob_type = &PyTuple_Type;
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#endif
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for (i = 0; i < newsize; ++i){
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sv->ob_item[i] = v->ob_item[i];
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v->ob_item[i] = NULL;
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}
|
|
sv->ob_size = v->ob_size;
|
|
tupledealloc(v);
|
|
*pv = (PyObject *) sv;
|
|
} else
|
|
#endif
|
|
{
|
|
sv = (PyTupleObject *)
|
|
PyObject_REALLOC((char *)v,
|
|
sizeof(PyTupleObject) + newsize * sizeof(PyObject *));
|
|
*pv = (PyObject *) sv;
|
|
if (sv == NULL) {
|
|
PyObject_DEL(v);
|
|
PyErr_NoMemory();
|
|
return -1;
|
|
}
|
|
}
|
|
_Py_NewReference((PyObject *)sv);
|
|
for (i = sv->ob_size; i < newsize; i++)
|
|
sv->ob_item[i] = NULL;
|
|
if (last_is_sticky && sizediff > 0) {
|
|
/* growing: move entries to the end and zero moved entries */
|
|
for (i = newsize - 1; i >= sizediff; i--) {
|
|
sv->ob_item[i] = sv->ob_item[i - sizediff];
|
|
sv->ob_item[i - sizediff] = NULL;
|
|
}
|
|
}
|
|
sv->ob_size = newsize;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
PyTuple_Fini()
|
|
{
|
|
#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_DEL(q);
|
|
}
|
|
}
|
|
#endif
|
|
}
|