mirror of https://github.com/python/cpython.git
634 lines
13 KiB
C
634 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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/* Generic object operations; and implementation of None (NoObject) */
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#include "allobjects.h"
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#if defined( Py_TRACE_REFS ) || defined( Py_REF_DEBUG )
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long ref_total;
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#endif
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/* Object allocation routines used by NEWOBJ and NEWVAROBJ macros.
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These are used by the individual routines for object creation.
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Do not call them otherwise, they do not initialize the object! */
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#ifdef COUNT_ALLOCS
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static typeobject *type_list;
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extern int tuple_zero_allocs, fast_tuple_allocs;
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extern int quick_int_allocs, quick_neg_int_allocs;
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extern int null_strings, one_strings;
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void
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dump_counts()
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{
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typeobject *tp;
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for (tp = type_list; tp; tp = tp->tp_next)
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fprintf(stderr, "%s alloc'd: %d, freed: %d, max in use: %d\n",
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tp->tp_name, tp->tp_alloc, tp->tp_free,
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tp->tp_maxalloc);
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fprintf(stderr, "fast tuple allocs: %d, empty: %d\n",
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fast_tuple_allocs, tuple_zero_allocs);
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fprintf(stderr, "fast int allocs: pos: %d, neg: %d\n",
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quick_int_allocs, quick_neg_int_allocs);
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fprintf(stderr, "null strings: %d, 1-strings: %d\n",
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null_strings, one_strings);
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}
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PyObject *
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get_counts()
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{
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PyTypeObject *tp;
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PyObject *result;
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PyObject *v;
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result = PyList_New(0);
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if (result == NULL)
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return NULL;
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for (tp = type_list; tp; tp = tp->tp_next) {
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v = Py_BuildValue("(siii)", tp->tp_name, tp->tp_alloc,
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tp->tp_free, tp->tp_maxalloc);
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if (v == NULL) {
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Py_DECREF(result);
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return NULL;
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}
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if (PyList_Append(result, v) < 0) {
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Py_DECREF(v);
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Py_DECREF(result);
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return NULL;
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}
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Py_DECREF(v);
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}
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return result;
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}
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void
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inc_count(tp)
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typeobject *tp;
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{
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if (tp->tp_alloc == 0) {
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/* first time; insert in linked list */
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if (tp->tp_next != NULL) /* sanity check */
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fatal("XXX inc_count sanity check");
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tp->tp_next = type_list;
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type_list = tp;
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}
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tp->tp_alloc++;
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if (tp->tp_alloc - tp->tp_free > tp->tp_maxalloc)
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tp->tp_maxalloc = tp->tp_alloc - tp->tp_free;
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}
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#endif
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#ifndef MS_COREDLL
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object *
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newobject(tp)
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typeobject *tp;
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#else
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object *
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newobject(tp,op)
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typeobject *tp;
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PyObject *op;
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#endif
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{
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#ifndef MS_COREDLL
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object *op = (object *) malloc(tp->tp_basicsize);
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#endif
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if (op == NULL)
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return err_nomem();
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op->ob_type = tp;
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NEWREF(op);
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return op;
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}
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#ifndef MS_COREDLL
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varobject *
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newvarobject(tp, size)
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typeobject *tp;
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int size;
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#else
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varobject *
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newvarobject(tp, size, op)
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typeobject *tp;
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int size;
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varobject *op;
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#endif
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{
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#ifndef MS_COREDLL
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varobject *op = (varobject *)
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malloc(tp->tp_basicsize + size * tp->tp_itemsize);
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#endif
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if (op == NULL)
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return (varobject *)err_nomem();
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op->ob_type = tp;
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op->ob_size = size;
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NEWREF(op);
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return op;
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}
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int
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printobject(op, fp, flags)
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object *op;
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FILE *fp;
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int flags;
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{
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int ret = 0;
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if (sigcheck())
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return -1;
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if (op == NULL) {
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fprintf(fp, "<nil>");
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}
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else {
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if (op->ob_refcnt <= 0)
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fprintf(fp, "<refcnt %u at %lx>",
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op->ob_refcnt, (long)op);
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else if (op->ob_type->tp_print == NULL) {
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if (op->ob_type->tp_repr == NULL) {
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fprintf(fp, "<%s object at %lx>",
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op->ob_type->tp_name, (long)op);
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}
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else {
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object *s;
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if (flags & PRINT_RAW)
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s = strobject(op);
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else
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s = reprobject(op);
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if (s == NULL)
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ret = -1;
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else if (!is_stringobject(s)) {
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err_setstr(TypeError,
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"repr not string");
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ret = -1;
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}
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else {
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fprintf(fp, "%s", getstringvalue(s));
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}
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XDECREF(s);
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}
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}
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else
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ret = (*op->ob_type->tp_print)(op, fp, flags);
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}
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if (ret == 0) {
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if (ferror(fp)) {
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err_errno(IOError);
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clearerr(fp);
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ret = -1;
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}
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}
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return ret;
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}
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object *
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reprobject(v)
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object *v;
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{
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if (sigcheck())
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return NULL;
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if (v == NULL)
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return newstringobject("<NULL>");
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else if (v->ob_type->tp_repr == NULL) {
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char buf[120];
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sprintf(buf, "<%.80s object at %lx>",
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v->ob_type->tp_name, (long)v);
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return newstringobject(buf);
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}
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else
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return (*v->ob_type->tp_repr)(v);
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}
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object *
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strobject(v)
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object *v;
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{
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if (v == NULL)
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return newstringobject("<NULL>");
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else if (is_stringobject(v)) {
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INCREF(v);
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return v;
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}
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else if (v->ob_type->tp_str != NULL)
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return (*v->ob_type->tp_str)(v);
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else {
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object *func;
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object *res;
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if (!is_instanceobject(v) ||
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(func = getattr(v, "__str__")) == NULL) {
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err_clear();
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return reprobject(v);
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}
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res = call_object(func, (object *)NULL);
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DECREF(func);
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return res;
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}
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}
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static object *
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do_cmp(v, w)
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object *v, *w;
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{
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/* __rcmp__ actually won't be called unless __cmp__ isn't defined,
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because the check in cmpobject() reverses the objects first.
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This is intentional -- it makes no sense to define cmp(x,y) different
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than -cmp(y,x). */
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if (is_instanceobject(v) || is_instanceobject(w))
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return instancebinop(v, w, "__cmp__", "__rcmp__", do_cmp);
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return newintobject((long)cmpobject(v, w));
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}
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int
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cmpobject(v, w)
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object *v, *w;
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{
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typeobject *tp;
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if (v == w)
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return 0;
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if (v == NULL)
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return -1;
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if (w == NULL)
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return 1;
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if (is_instanceobject(v) || is_instanceobject(w)) {
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object *res;
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int c;
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if (!is_instanceobject(v))
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return -cmpobject(w, v);
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res = do_cmp(v, w);
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if (res == NULL) {
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err_clear();
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return (v < w) ? -1 : 1;
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}
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if (!is_intobject(res)) {
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DECREF(res);
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return (v < w) ? -1 : 1;
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}
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c = getintvalue(res);
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DECREF(res);
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return (c < 0) ? -1 : (c > 0) ? 1 : 0;
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}
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if ((tp = v->ob_type) != w->ob_type) {
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if (tp->tp_as_number != NULL &&
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w->ob_type->tp_as_number != NULL) {
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if (coerce(&v, &w) != 0) {
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err_clear();
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/* XXX Should report the error,
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XXX but the interface isn't there... */
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}
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else {
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int cmp = (*v->ob_type->tp_compare)(v, w);
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DECREF(v);
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DECREF(w);
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return cmp;
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}
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}
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return strcmp(tp->tp_name, w->ob_type->tp_name);
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}
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if (tp->tp_compare == NULL)
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return (v < w) ? -1 : 1;
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return (*tp->tp_compare)(v, w);
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}
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long
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hashobject(v)
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object *v;
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{
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typeobject *tp = v->ob_type;
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if (tp->tp_hash != NULL)
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return (*tp->tp_hash)(v);
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if (tp->tp_compare == NULL)
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return (long) v; /* Use address as hash value */
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/* If there's a cmp but no hash defined, the object can't be hashed */
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err_setstr(TypeError, "unhashable type");
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return -1;
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}
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object *
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getattr(v, name)
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object *v;
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char *name;
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{
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if (v->ob_type->tp_getattro != NULL) {
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object *w, *res;
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w = newstringobject(name);
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if (w == NULL)
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return NULL;
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res = (*v->ob_type->tp_getattro)(v, w);
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XDECREF(w);
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return res;
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}
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if (v->ob_type->tp_getattr == NULL) {
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err_setstr(AttributeError, "attribute-less object");
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return NULL;
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}
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else {
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return (*v->ob_type->tp_getattr)(v, name);
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}
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}
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int
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hasattr(v, name)
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object *v;
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char *name;
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{
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object *res = getattr(v, name);
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if (res != NULL) {
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DECREF(res);
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return 1;
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}
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err_clear();
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return 0;
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}
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int
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setattr(v, name, w)
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object *v;
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char *name;
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object *w;
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{
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if (v->ob_type->tp_setattro != NULL) {
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object *s;
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int res;
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s = newstringobject(name);
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if (s == NULL)
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return -1;
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res = (*v->ob_type->tp_setattro)(v, s, w);
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XDECREF(s);
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return res;
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}
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if (v->ob_type->tp_setattr == NULL) {
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if (v->ob_type->tp_getattr == NULL)
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err_setstr(TypeError,
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"attribute-less object (assign or del)");
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else
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err_setstr(TypeError,
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"object has read-only attributes");
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return -1;
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}
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else {
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return (*v->ob_type->tp_setattr)(v, name, w);
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}
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}
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/* Test a value used as condition, e.g., in a for or if statement.
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Return -1 if an error occurred */
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int
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testbool(v)
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object *v;
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{
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int res;
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if (v == None)
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res = 0;
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else if (v->ob_type->tp_as_number != NULL)
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res = (*v->ob_type->tp_as_number->nb_nonzero)(v);
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else if (v->ob_type->tp_as_mapping != NULL)
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res = (*v->ob_type->tp_as_mapping->mp_length)(v);
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else if (v->ob_type->tp_as_sequence != NULL)
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res = (*v->ob_type->tp_as_sequence->sq_length)(v);
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else
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res = 1;
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if (res > 0)
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res = 1;
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return res;
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}
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/* Coerce two numeric types to the "larger" one.
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Increment the reference count on each argument.
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Return -1 and raise an exception if no coercion is possible
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(and then no reference count is incremented).
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*/
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int
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coerce(pv, pw)
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object **pv, **pw;
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{
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register object *v = *pv;
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register object *w = *pw;
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int res;
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if (v->ob_type == w->ob_type && !is_instanceobject(v)) {
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INCREF(v);
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INCREF(w);
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return 0;
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}
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if (v->ob_type->tp_as_number && v->ob_type->tp_as_number->nb_coerce) {
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res = (*v->ob_type->tp_as_number->nb_coerce)(pv, pw);
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if (res <= 0)
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return res;
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}
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if (w->ob_type->tp_as_number && w->ob_type->tp_as_number->nb_coerce) {
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res = (*w->ob_type->tp_as_number->nb_coerce)(pw, pv);
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if (res <= 0)
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return res;
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}
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err_setstr(TypeError, "number coercion failed");
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return -1;
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}
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/* Test whether an object can be called */
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int
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callable(x)
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object *x;
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{
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if (x == NULL)
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return 0;
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if (x->ob_type->tp_call != NULL ||
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is_funcobject(x) ||
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is_instancemethodobject(x) ||
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is_methodobject(x) ||
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is_classobject(x))
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return 1;
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if (is_instanceobject(x)) {
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object *call = getattr(x, "__call__");
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if (call == NULL) {
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err_clear();
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return 0;
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}
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/* Could test recursively but don't, for fear of endless
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recursion if some joker sets self.__call__ = self */
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DECREF(call);
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return 1;
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}
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return 0;
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}
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/*
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NoObject is usable as a non-NULL undefined value, used by the macro None.
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There is (and should be!) no way to create other objects of this type,
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so there is exactly one (which is indestructible, by the way).
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*/
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/* ARGSUSED */
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static object *
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none_repr(op)
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object *op;
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{
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return newstringobject("None");
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}
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static typeobject Notype = {
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OB_HEAD_INIT(&Typetype)
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0,
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"None",
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0,
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0,
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0, /*tp_dealloc*/ /*never called*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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(reprfunc)none_repr, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /*tp_hash */
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};
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object NoObject = {
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OB_HEAD_INIT(&Notype)
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};
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#ifdef Py_TRACE_REFS
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static object refchain = {&refchain, &refchain};
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void
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NEWREF(op)
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object *op;
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{
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ref_total++;
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op->ob_refcnt = 1;
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op->_ob_next = refchain._ob_next;
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op->_ob_prev = &refchain;
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refchain._ob_next->_ob_prev = op;
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refchain._ob_next = op;
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#ifdef COUNT_ALLOCS
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inc_count(op->ob_type);
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#endif
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}
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void
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UNREF(op)
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register object *op;
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{
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register object *p;
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if (op->ob_refcnt < 0)
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fatal("UNREF negative refcnt");
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if (op == &refchain ||
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op->_ob_prev->_ob_next != op || op->_ob_next->_ob_prev != op)
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fatal("UNREF invalid object");
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#ifdef SLOW_UNREF_CHECK
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for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) {
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if (p == op)
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break;
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}
|
|
if (p == &refchain) /* Not found */
|
|
fatal("UNREF unknown object");
|
|
#endif
|
|
op->_ob_next->_ob_prev = op->_ob_prev;
|
|
op->_ob_prev->_ob_next = op->_ob_next;
|
|
op->_ob_next = op->_ob_prev = NULL;
|
|
#ifdef COUNT_ALLOCS
|
|
op->ob_type->tp_free++;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
DELREF(op)
|
|
object *op;
|
|
{
|
|
destructor dealloc = op->ob_type->tp_dealloc;
|
|
UNREF(op);
|
|
op->ob_type = NULL;
|
|
(*dealloc)(op);
|
|
}
|
|
|
|
void
|
|
_Py_PrintReferences(fp)
|
|
FILE *fp;
|
|
{
|
|
object *op;
|
|
fprintf(fp, "Remaining objects (except strings referenced once):\n");
|
|
for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) {
|
|
if (op->ob_refcnt == 1 && is_stringobject(op))
|
|
continue; /* Will be printed elsewhere */
|
|
fprintf(fp, "[%d] ", op->ob_refcnt);
|
|
if (printobject(op, fp, 0) != 0)
|
|
err_clear();
|
|
putc('\n', fp);
|
|
}
|
|
}
|
|
|
|
PyObject *
|
|
_Py_GetObjects(self, args)
|
|
PyObject *self;
|
|
PyObject *args;
|
|
{
|
|
int i, n;
|
|
PyObject *t = NULL;
|
|
PyObject *res, *op;
|
|
|
|
if (!PyArg_ParseTuple(args, "i|O", &n, &t))
|
|
return NULL;
|
|
op = refchain._ob_next;
|
|
res = PyList_New(0);
|
|
if (res == NULL)
|
|
return NULL;
|
|
for (i = 0; (n == 0 || i < n) && op != &refchain; i++) {
|
|
while (op == self || op == args || op == res || op == t ||
|
|
t != NULL && op->ob_type != (PyTypeObject *) t) {
|
|
op = op->_ob_next;
|
|
if (op == &refchain)
|
|
return res;
|
|
}
|
|
if (PyList_Append(res, op) < 0) {
|
|
Py_DECREF(res);
|
|
return NULL;
|
|
}
|
|
op = op->_ob_next;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
/* Hack to force loading of cobject.o */
|
|
PyTypeObject *_Py_cobject_hack = &PyCObject_Type;
|
|
|
|
|
|
/* Hack to force loading of abstract.o */
|
|
int (*_Py_abstract_hack) FPROTO((PyObject *)) = &PyObject_Length;
|