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ed18fdc9fc
objects of its derived classes; allow anything that has an attribute named "__privileged__" access to anything. * object.[ch]: added hasattr() -- test whether getattr() will succeed.
358 lines
7.4 KiB
C
358 lines
7.4 KiB
C
/***********************************************************
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Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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Amsterdam, 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 not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR 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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#ifdef 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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object *
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newobject(tp)
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typeobject *tp;
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{
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object *op = (object *) malloc(tp->tp_basicsize);
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if (op == NULL)
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return err_nomem();
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NEWREF(op);
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op->ob_type = tp;
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return op;
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}
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varobject *
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newvarobject(tp, size)
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typeobject *tp;
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unsigned int size;
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{
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varobject *op = (varobject *)
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malloc(tp->tp_basicsize + size * tp->tp_itemsize);
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if (op == NULL)
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return (varobject *)err_nomem();
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NEWREF(op);
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op->ob_type = tp;
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op->ob_size = size;
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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 (intrcheck()) {
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err_set(KeyboardInterrupt);
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return -1;
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}
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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 = 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 (intrcheck()) {
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err_set(KeyboardInterrupt);
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return NULL;
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}
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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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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 ((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_getattr == NULL) {
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err_setstr(TypeError, "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_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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/*
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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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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 TRACE_REFS
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static object refchain = {&refchain, &refchain};
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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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}
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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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fprintf(stderr, "UNREF negative refcnt\n");
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abort();
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}
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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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fprintf(stderr, "UNREF invalid object\n");
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abort();
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}
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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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}
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if (p == &refchain) { /* Not found */
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fprintf(stderr, "UNREF unknown object\n");
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abort();
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}
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#endif
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op->_ob_next->_ob_prev = op->_ob_prev;
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op->_ob_prev->_ob_next = op->_ob_next;
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op->_ob_next = op->_ob_prev = NULL;
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}
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DELREF(op)
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object *op;
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{
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UNREF(op);
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(*(op)->ob_type->tp_dealloc)(op);
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op->ob_type = NULL;
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}
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printrefs(fp)
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FILE *fp;
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{
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object *op;
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fprintf(fp, "Remaining objects (except strings referenced once):\n");
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for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) {
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if (op->ob_refcnt == 1 && is_stringobject(op))
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continue; /* Will be printed elsewhere */
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fprintf(fp, "[%d] ", op->ob_refcnt);
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if (printobject(op, fp, 0) != 0)
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err_clear();
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putc('\n', fp);
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}
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}
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#endif
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